{"id":15742,"date":"2026-06-16T11:39:20","date_gmt":"2026-06-16T03:39:20","guid":{"rendered":"https:\/\/www.drillpipes.com\/how-to-choose-api-5dp-%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%b0%d1%8f-%d1%82%d1%80%d1%83%d0%b1%d0%b0-%d0%ba%d0%bb%d0%b0%d1%81%d1%81s-for-deep-and-directional-%d1%81%d0%ba%d0%b2%d0%b0%d0%b6\/"},"modified":"2026-09-18T16:03:14","modified_gmt":"2026-09-18T08:03:14","slug":"how-to-choose-api-5dp-%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%b0%d1%8f-%d1%82%d1%80%d1%83%d0%b1%d0%b0-%d0%ba%d0%bb%d0%b0%d1%81%d1%81s-for-deep-and-directional-%d1%81%d0%ba%d0%b2%d0%b0%d0%b6","status":"publish","type":"post","link":"https:\/\/www.drillpipes.com\/ru\/how-to-choose-api-5dp-%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%b0%d1%8f-%d1%82%d1%80%d1%83%d0%b1%d0%b0-%d0%ba%d0%bb%d0%b0%d1%81%d1%81s-for-deep-and-directional-%d1%81%d0%ba%d0%b2%d0%b0%d0%b6\/","title":{"rendered":"How to Choose API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043a\u043b\u0430\u0441\u0441s for Deep and Directional \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>API 5DP Drill Pipe Grade Selection<\/strong> for deep and directional wells requires two different review paths. Deep-well selection is governed mainly by buoyed drill string weight, maximum hook load, planned overpull and the tensile capacity of the upper string. Directional-well selection adds torque-drag, dogleg-related bending, rotation time and fatigue near the upset transition, tool joint and thread shoulder.<\/p>\n\n<p class=\"wp-block-paragraph\">The key decision is where <strong>X95 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430, G105 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 and S135 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430<\/strong> fit within these load conditions. X95 remains relevant where directional load and \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 are controlled, G105 covers many deeper or higher-load sections, and S135 is reviewed when \u043a\u0440\u044e\u043a load, long lateral rotation or ERD loading exceeds the available G105 margin. \u0442\u0440\u0443\u0431\u0430 size, \u0442\u043e\u043b\u0449\u0438\u043d\u0430 \u0441\u0442\u0435\u043d\u043a\u0438, upset type, \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 capacity, service condition and inspection records must support the same \u043a\u043b\u0430\u0441\u0441 decision.<\/p>\n\n<h2 class=\"wp-block-heading\">Deep and Directional \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s Require Different \u043a\u043b\u0430\u0441\u0441 Logic<\/h2>\n\n<p class=\"wp-block-paragraph\">\u0433\u043b\u0443\u0431\u043e\u043a\u0430\u044f \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s and directional \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s do not place the same demand on a \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430. In a predominantly \u0432\u0435\u0440\u0442\u0438\u043a\u0430\u043b\u044c\u043d\u044b\u0439 \u0433\u043b\u0443\u0431\u043e\u043a\u0430\u044f \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430, the upper \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s carry the accumulated buoyed \u0432\u0435\u0441 of the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 together with planned overpull. The first \u043a\u043b\u0430\u0441\u0441-selection question is whether the selected \u0442\u0440\u0443\u0431\u0430 body, \u0442\u043e\u043b\u0449\u0438\u043d\u0430 \u0441\u0442\u0435\u043d\u043a\u0438 and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 provide sufficient tensile margin.<\/p>\n\n<p class=\"wp-block-paragraph\">Directional \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s introduce a combined load path. A \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 rotating through a build section or dogleg carries axial tension while also transmitting \u0440\u043e\u0442\u043e\u0440 \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 and passing through repeated bending cycles. In a long \u0433\u043e\u0440\u0438\u0437\u043e\u043d\u0442\u0430\u043b\u044c\u043d\u044b\u0439 interval, \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 and \u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u0435 accumulate over measured depth, while extended rotation increases \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c exposure near the upset transition, \u0442\u0440\u0435\u043d\u0438\u0435 weld, \u0440\u0435\u0437\u044c\u0431\u0430 shoulder and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435.<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Review Item<\/th><th class=\"has-text-align-center\" data-align=\"center\">\u0433\u043b\u0443\u0431\u043e\u043a\u0430\u044f \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430<\/th><th class=\"has-text-align-left\" data-align=\"left\">Directional or \u0433\u043e\u0440\u0438\u0437\u043e\u043d\u0442\u0430\u043b\u044c\u043d\u044b\u0439 \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">Primary load<\/td><td class=\"has-text-align-center\" data-align=\"center\">Axial tension and \u043a\u0440\u044e\u043a load<\/td><td class=\"has-text-align-left\" data-align=\"left\">Combined tension, \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442, \u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u0435 and bending<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Main design input<\/td><td class=\"has-text-align-center\" data-align=\"center\">Buoyed \u043a\u043e\u043b\u043e\u043d\u043d\u0430 \u0432\u0435\u0441, overpull and tensile margin<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442-\u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u0435, dogleg severity and rotation time<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Main mechanical concern<\/td><td class=\"has-text-align-center\" data-align=\"center\">Insufficient upper-\u043a\u043e\u043b\u043e\u043d\u043d\u0430 tensile capacity<\/td><td class=\"has-text-align-left\" data-align=\"left\">Cyclic \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435-side stress<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Common \u043a\u043b\u0430\u0441\u0441 range<\/td><td class=\"has-text-align-center\" data-align=\"center\">G105 \/ S135<\/td><td class=\"has-text-align-left\" data-align=\"left\">X95 \/ G105 \/ S135<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Additional review<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 tensile capacity<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442, upset transition and shoulder contact<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" data-id=\"13598\" src=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/how-to-choose-drill-pipe-grade-1024x768.jpg\" alt=\"\" class=\"wp-image-13598\" srcset=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/how-to-choose-drill-pipe-grade-1024x768.jpg 1024w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/how-to-choose-drill-pipe-grade-300x225.jpg 300w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/how-to-choose-drill-pipe-grade.jpg 1448w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/figure>\n\n<div data-wp-interactive=\"core\/file\" class=\"wp-block-file\"><object data-wp-bind--hidden=\"!state.hasPdfPreview\" hidden class=\"wp-block-file__embed\" data=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/API-5DP-Drill-Pipe-Grade-Selection-Matrix-for-Deep-and-Directional-Wells.pdf\" type=\"application\/pdf\" style=\"width:100%;height:600px\" aria-label=\"\u0412\u0441\u0442\u0430\u0432\u043a\u0430 API 5DP Drill Pipe Grade Selection Matrix for Deep and Directional Wells\"><\/object><a id=\"wp-block-file--media-90eea798-faff-4a19-97ca-9665bba64d21\" href=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/API-5DP-Drill-Pipe-Grade-Selection-Matrix-for-Deep-and-Directional-Wells.pdf\">API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043a\u043b\u0430\u0441\u0441 Selection Matrix for Deep and Directional \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s<\/a><a href=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/API-5DP-Drill-Pipe-Grade-Selection-Matrix-for-Deep-and-Directional-Wells.pdf\" class=\"wp-block-file__button wp-element-button\" download=\"\" aria-describedby=\"wp-block-file--media-90eea798-faff-4a19-97ca-9665bba64d21\">Download<\/a><\/div>\n\n<p class=\"wp-block-paragraph\">For \u0433\u043b\u0443\u0431\u043e\u043a\u0430\u044f \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s, the \u043a\u043b\u0430\u0441\u0441 boundary is set by buoyed \u043a\u043e\u043b\u043e\u043d\u043d\u0430 \u0432\u0435\u0441, maximum \u043a\u0440\u044e\u043a load, planned overpull and the remaining tensile capacity after wall-loss allowance. Directional \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s require an additional review of \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442-\u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u0435, dogleg severity, rotation time and \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c concentration at the upset transition and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435. G105 remains suitable where the combined \u0442\u0440\u0443\u0431\u0430-body and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 margins are adequate; S135 enters the review when higher \u043a\u0440\u044e\u043a load or long-lateral loading reduces those margins.<\/p>\n\n<h2 class=\"wp-block-heading\">API 5DP \u043a\u043b\u0430\u0441\u0441 Strength Baseline<\/h2>\n\n<p class=\"wp-block-paragraph\">API 5DP \u043a\u043b\u0430\u0441\u0441s are defined by specified yield and tensile limits for the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 body. Minimum \u043f\u0440\u0435\u0434\u0435\u043b \u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438 marks the start of permanent deformation, the maximum yield limit controls \u043a\u043b\u0430\u0441\u0441 consistency, and minimum \u043f\u0440\u043e\u0447\u043d\u043e\u0441\u0442\u044c \u043d\u0430 \u0440\u0430\u0437\u0440\u044b\u0432 verifies the required resistance before fracture. <a href=\"__PROTECTED_0__\">E75<\/a>, X95, G105 and S135 should therefore be reviewed as separate acceptance windows and applied to the actual \u0442\u0440\u0443\u0431\u0430 size, remaining wall section and operating load.<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">API 5DP \u043a\u043b\u0430\u0441\u0441<\/th><th class=\"has-text-align-center\" data-align=\"center\">Minimum \u043f\u0440\u0435\u0434\u0435\u043b \u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438<\/th><th class=\"has-text-align-center\" data-align=\"center\">Maximum \u043f\u0440\u0435\u0434\u0435\u043b \u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438<\/th><th class=\"has-text-align-center\" data-align=\"center\">Minimum \u043f\u0440\u043e\u0447\u043d\u043e\u0441\u0442\u044c \u043d\u0430 \u0440\u0430\u0437\u0440\u044b\u0432<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>E75<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">75 ksi \/ 517 \u041c\u041f\u0430<\/td><td class=\"has-text-align-center\" data-align=\"center\">105 ksi \/ 724 \u041c\u041f\u0430<\/td><td class=\"has-text-align-center\" data-align=\"center\">100 ksi \/ 689 \u041c\u041f\u0430<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>X95<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">95 ksi \/ 655 \u041c\u041f\u0430<\/td><td class=\"has-text-align-center\" data-align=\"center\">125 ksi \/ 862 \u041c\u041f\u0430<\/td><td class=\"has-text-align-center\" data-align=\"center\">105 ksi \/ 724 \u041c\u041f\u0430<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>G105<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">105 ksi \/ 724 \u041c\u041f\u0430<\/td><td class=\"has-text-align-center\" data-align=\"center\">135 ksi \/ 931 \u041c\u041f\u0430<\/td><td class=\"has-text-align-center\" data-align=\"center\">115 ksi \/ 793 \u041c\u041f\u0430<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>S135<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">135 ksi \/ 931 \u041c\u041f\u0430<\/td><td class=\"has-text-align-center\" data-align=\"center\">165 ksi \/ 1,138 \u041c\u041f\u0430<\/td><td class=\"has-text-align-center\" data-align=\"center\">145 ksi \/ 1,000 \u041c\u041f\u0430<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">\u0442\u0440\u0443\u0431\u0430-body tensile capacity is governed by \u043a\u043b\u0430\u0441\u0441 strength together with OD, \u0442\u043e\u043b\u0449\u0438\u043d\u0430 \u0441\u0442\u0435\u043d\u043a\u0438 and wall loss, so a worn or lighter-wall S135 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 can retain less usable tensile margin than a thicker-wall G105 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435. Actual dimensions and \u0438\u0437\u043d\u043e\u0441 allowance should be confirmed before the \u043a\u043b\u0430\u0441\u0441 is matched to \u043a\u0440\u044e\u043a load and planned overpull.<\/p>\n\n<h2 class=\"wp-block-heading\">How to Choose a \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043a\u043b\u0430\u0441\u0441 for \u0433\u043b\u0443\u0431\u043e\u043a\u0430\u044f \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s<\/h2>\n\n<p class=\"wp-block-paragraph\">Selection of <strong>API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043a\u043b\u0430\u0441\u0441s for \u0433\u043b\u0443\u0431\u043e\u043a\u0430\u044f \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s<\/strong> begins with upper-\u043a\u043e\u043b\u043e\u043d\u043d\u0430 axial load. Total \u0432\u0435\u0440\u0442\u0438\u043a\u0430\u043b\u044c\u043d\u044b\u0439 depth alone does not determine the \u043a\u043b\u0430\u0441\u0441. \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s with similar depth can require different \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 specifications because of differences in \u0442\u0440\u0443\u0431\u0430 size, \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 configuration, \u0431\u0443\u0440\u0435\u043d\u0438\u0435-fluid density, BHA \u0432\u0435\u0441 and planned overpull.<\/p>\n\n<h3 class=\"wp-block-heading\">Calculate the Upper-\u043a\u043e\u043b\u043e\u043d\u043d\u0430 Load<\/h3>\n\n<p class=\"wp-block-paragraph\">The deep-\u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 load review should include:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>buoyed \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 \u0432\u0435\u0441<\/li>\n\n\n\n<li>maximum expected \u043a\u0440\u044e\u043a load<\/li>\n\n\n\n<li>planned overpull<\/li>\n\n\n\n<li>dynamic load allowance<\/li>\n\n\n\n<li>BHA \u0432\u0435\u0441<\/li>\n\n\n\n<li>remaining tensile design margin<\/li>\n\n\n\n<li>expected wall loss or \u0438\u0437\u043d\u043e\u0441 allowance<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">Buoyancy reduces the effective \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 \u0432\u0435\u0441 in fluid, but the upper \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s still carry the accumulated load of the \u043a\u043e\u043b\u043e\u043d\u043d\u0430 below. Planned overpull also needs to be included because stuck-\u0442\u0440\u0443\u0431\u0430 recovery places additional tension on the same upper section.<\/p>\n\n<h3 class=\"wp-block-heading\">Match the Load with \u0442\u0440\u0443\u0431\u0430-Body Capacity<\/h3>\n\n<p class=\"wp-block-paragraph\">\u0442\u0440\u0443\u0431\u0430-body tensile capacity is determined by \u043a\u043b\u0430\u0441\u0441 strength, OD, \u0442\u043e\u043b\u0449\u0438\u043d\u0430 \u0441\u0442\u0435\u043d\u043a\u0438 and remaining metal area. A heavier-wall G105 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 can provide greater tensile capacity than a lighter-wall S135 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 of another size.<\/p>\n\n<p class=\"wp-block-paragraph\">The deep-\u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 review should connect:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>\u0442\u0440\u0443\u0431\u0430 body OD<\/li>\n\n\n\n<li>actual \u0442\u043e\u043b\u0449\u0438\u043d\u0430 \u0441\u0442\u0435\u043d\u043a\u0438<\/li>\n\n\n\n<li>nominal \u0432\u0435\u0441<\/li>\n\n\n\n<li>minimum \u043f\u0440\u0435\u0434\u0435\u043b \u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438<\/li>\n\n\n\n<li>remaining wall after \u0438\u0437\u043d\u043e\u0441<\/li>\n\n\n\n<li>\u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 tensile capacity<\/li>\n\n\n\n<li>\u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 geometry<\/li>\n\n\n\n<li>current inspection condition<\/li>\n<\/ul>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Deep-\u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 Input<\/th><th class=\"has-text-align-center\" data-align=\"center\">What It Controls<\/th><th class=\"has-text-align-center\" data-align=\"center\">Effect on \u043a\u043b\u0430\u0441\u0441 Review<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">Buoyed \u043a\u043e\u043b\u043e\u043d\u043d\u0430 \u0432\u0435\u0441<\/td><td class=\"has-text-align-center\" data-align=\"center\">Static axial load<\/td><td class=\"has-text-align-center\" data-align=\"center\">Establishes the minimum tensile requirement<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Maximum \u043a\u0440\u044e\u043a load<\/td><td class=\"has-text-align-center\" data-align=\"center\">Upper-\u043a\u043e\u043b\u043e\u043d\u043d\u0430 loading<\/td><td class=\"has-text-align-center\" data-align=\"center\">Helps separate G105 and S135 review<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Planned overpull<\/td><td class=\"has-text-align-center\" data-align=\"center\">Stuck-\u0442\u0440\u0443\u0431\u0430 recovery margin<\/td><td class=\"has-text-align-center\" data-align=\"center\">Reduces the remaining tensile margin<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">OD and \u0442\u043e\u043b\u0449\u0438\u043d\u0430 \u0441\u0442\u0435\u043d\u043a\u0438<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u0442\u0440\u0443\u0431\u0430-body metal area<\/td><td class=\"has-text-align-center\" data-align=\"center\">Changes capacity within the same \u043a\u043b\u0430\u0441\u0441<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 strength<\/td><td class=\"has-text-align-center\" data-align=\"center\">Assembly limit<\/td><td class=\"has-text-align-center\" data-align=\"center\">Can control before \u0442\u0440\u0443\u0431\u0430-body yield<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0438\u0437\u043d\u043e\u0441 allowance<\/td><td class=\"has-text-align-center\" data-align=\"center\">Remaining \u0442\u0440\u0443\u0431\u0430-body capacity<\/td><td class=\"has-text-align-center\" data-align=\"center\">Requires derating or closer inspection<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<h3 class=\"wp-block-heading\">Deep-\u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 \u043a\u043b\u0430\u0441\u0441 Boundary<\/h3>\n\n<p class=\"wp-block-paragraph\"><strong><a href=\"https:\/\/www.octalsteel.com\/product\/x95-drill-pipe\/\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-secondary-color\">X95 Drill Pipe<\/mark><\/a><\/strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-secondary-color\"> <\/mark>is suitable where the calculated upper-string tension, planned overpull and remaining wall section stay within the X95 design margin. It is mainly reviewed for medium-depth or lower-load deep wells using controlled string weight and standard connection demand.<\/p>\n\n<p class=\"wp-block-paragraph\"><strong><a href=\"https:\/\/www.drillpipes.com\/ru\/%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%b0%d1%8f-%d1%82%d1%80%d1%83%d0%b1%d0%b0-g105\/\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-secondary-color\">G105 Drill Pipe<\/mark><\/a><\/strong> is selected when X95 no longer provides enough tensile margin for the buoyed drill string weight and planned overpull. The review should include pipe-body cross-sectional area, remaining wall thickness, tool joint tensile capacity and the highest load carried by the upper string.<\/p>\n\n<p class=\"wp-block-paragraph\"><strong>S135 Drill Pipe<\/strong> is reviewed when the combined hook load, overpull allowance and string weight approach the usable G105 capacity. Its higher pipe-body strength must be matched by the tool joint, shoulder contact, thread condition and upset-transition fatigue margin.<\/p>\n\n<p class=\"wp-block-paragraph\">The <a href=\"__PROTECTED_0__\">G105\u2013S135 boundary<\/a> is therefore defined by calculated load and remaining section capacity, not by measured depth alone. \u043a\u043b\u0430\u0441\u0441 selection should be based on the actual \u043a\u043e\u043b\u043e\u043d\u043d\u0430 configuration, \u0442\u043e\u043b\u0449\u0438\u043d\u0430 \u0441\u0442\u0435\u043d\u043a\u0438, \u0438\u0437\u043d\u043e\u0441 allowance and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 limit.<\/p>\n\n<div data-wp-interactive=\"core\/file\" class=\"wp-block-file\"><object data-wp-bind--hidden=\"!state.hasPdfPreview\" hidden class=\"wp-block-file__embed\" data=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/Deep-Well-Drill-Pipe-Grade-Selection-and-Upper-String-Load-Review.pdf\" type=\"application\/pdf\" style=\"width:100%;height:600px\" aria-label=\"\u0412\u0441\u0442\u0430\u0432\u043a\u0430 Deep-Well Drill Pipe Grade Selection and Upper-String Load Review\"><\/object><a id=\"wp-block-file--media-bf196add-95de-41d8-8925-f132770d5ee4\" href=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/Deep-Well-Drill-Pipe-Grade-Selection-and-Upper-String-Load-Review.pdf\">Deep-\u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043a\u043b\u0430\u0441\u0441 Selection and Upper-\u043a\u043e\u043b\u043e\u043d\u043d\u0430 Load Review<\/a><a href=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/Deep-Well-Drill-Pipe-Grade-Selection-and-Upper-String-Load-Review.pdf\" class=\"wp-block-file__button wp-element-button\" download=\"\" aria-describedby=\"wp-block-file--media-bf196add-95de-41d8-8925-f132770d5ee4\">Download<\/a><\/div>\n\n<h2 class=\"wp-block-heading\">How to Choose a \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043a\u043b\u0430\u0441\u0441 for Directional \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s<\/h2>\n\n<p class=\"wp-block-paragraph\">Selecting a <strong>\u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043a\u043b\u0430\u0441\u0441 for \u043d\u0430\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u043d\u043e\u0435 \u0431\u0443\u0440\u0435\u043d\u0438\u0435<\/strong> requires the load path to be reviewed by \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 section. Total measured depth alone does not represent \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 demand: the \u0432\u0435\u0440\u0442\u0438\u043a\u0430\u043b\u044c\u043d\u044b\u0439 section is dominated by axial tension, build and drop sections introduce repeated bending, and the hold or \u0433\u043e\u0440\u0438\u0437\u043e\u043d\u0442\u0430\u043b\u044c\u043d\u044b\u0439 section combines \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442, \u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u0435, \u0441\u0442\u0432\u043e\u043b \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u044b contact and cumulative \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c.<\/p>\n\n<h3 class=\"wp-block-heading\">Load Path by \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 Section<\/h3>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">\u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 Section<\/th><th class=\"has-text-align-center\" data-align=\"center\">Dominant Load<\/th><th>Main Review<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0432\u0435\u0440\u0442\u0438\u043a\u0430\u043b\u044c\u043d\u044b\u0439 section<\/td><td class=\"has-text-align-center\" data-align=\"center\">Axial tension and \u043a\u0440\u044e\u043a load<\/td><td>Buoyed \u043a\u043e\u043b\u043e\u043d\u043d\u0430 \u0432\u0435\u0441, overpull margin and \u0442\u0440\u0443\u0431\u0430-body tensile capacity<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Build \/ drop section<\/td><td class=\"has-text-align-center\" data-align=\"center\">Tension plus repeated bending<\/td><td>Dogleg severity, build rate, rotation time and upset-transition \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Hold section<\/td><td class=\"has-text-align-center\" data-align=\"center\">Combined tension, \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 and \u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u0435<\/td><td>Pick-up \/ slack-off load, \u0440\u043e\u0442\u043e\u0440 \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 capacity<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0433\u043e\u0440\u0438\u0437\u043e\u043d\u0442\u0430\u043b\u044c\u043d\u044b\u0439 lateral<\/td><td class=\"has-text-align-center\" data-align=\"center\">Sustained \u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u0435, contact and cumulative rotation<\/td><td>\u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 accumulation, \u0438\u0437\u043d\u043e\u0441, \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c exposure and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 condition<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-2 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" data-id=\"13602\" src=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/drill-pipe-grade-for-directional-drilling-1024x768.jpg\" alt=\"\" class=\"wp-image-13602\" srcset=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/drill-pipe-grade-for-directional-drilling-1024x768.jpg 1024w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/drill-pipe-grade-for-directional-drilling-300x225.jpg 300w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/drill-pipe-grade-for-directional-drilling.jpg 1448w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/figure>\n\n<p class=\"wp-block-paragraph\">The \u043a\u043b\u0430\u0441\u0441 review should follow the most severe section of the trajectory. A \u0442\u0440\u0443\u0431\u0430 that has enough tensile margin in the \u0432\u0435\u0440\u0442\u0438\u043a\u0430\u043b\u044c\u043d\u044b\u0439 section can still be limited by bending \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c in the build section or by \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 in the lateral interval.<\/p>\n\n<h3 class=\"wp-block-heading\">\u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442, Dogleg and \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c Review<\/h3>\n\n<p class=\"wp-block-paragraph\">\u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442-\u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u0435 analysis should co\u041c\u041f\u0430re <strong>pick-up load, slack-off load, rotating load, sliding load and maximum \u0440\u043e\u0442\u043e\u0440 \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442<\/strong> with the \u0442\u0440\u0443\u0431\u0430-body and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 limits. \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 geometry, shoulder contact, \u0440\u0435\u0437\u044c\u0431\u0430 condition and make-up \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 determine the \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435-side capacity; increasing the \u0442\u0440\u0443\u0431\u0430-body \u043a\u043b\u0430\u0441\u0441 does not increase these limits automatically.<\/p>\n\n<p class=\"wp-block-paragraph\">Dogleg severity and rotation time determine the number and intensity of bending cycles. \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c demand concentrates near:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>the \u0442\u0440\u0443\u0431\u0430-body-to-upset transition<\/li>\n\n\n\n<li>the \u0442\u0440\u0435\u043d\u0438\u0435-weld area<\/li>\n\n\n\n<li>the \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 transition<\/li>\n\n\n\n<li>the \u0440\u0435\u0437\u044c\u0431\u0430 root<\/li>\n\n\n\n<li>the shoulder contact area<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">Long laterals add sustained \u0441\u0442\u0432\u043e\u043b \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u044b contact, accumulated \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442-\u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u0435, abrasive \u0438\u0437\u043d\u043e\u0441 and repeated rotation. These conditions require \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 review even when the calculated axial stress remains below the \u0442\u0440\u0443\u0431\u0430-body yield limit.<\/p>\n\n<h3 class=\"wp-block-heading\">Directional-\u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 \u043a\u043b\u0430\u0441\u0441 Boundary<\/h3>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Directional-\u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 Condition<\/th><th>Main Control Point<\/th><th class=\"has-text-align-center\" data-align=\"center\">Common \u043a\u043b\u0430\u0441\u0441 Review<\/th><\/tr><\/thead><tbody><tr><td>Short directional section with moderate dogleg<\/td><td>Tensile margin and \u0441\u0432\u0435\u0447\u0430ard \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 condition<\/td><td class=\"has-text-align-center\" data-align=\"center\">X95 \/ G105<\/td><\/tr><tr><td>Higher \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 with controlled bending exposure<\/td><td>\u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 capacity and shoulder contact<\/td><td class=\"has-text-align-center\" data-align=\"center\">G105<\/td><\/tr><tr><td>Long \u0433\u043e\u0440\u0438\u0437\u043e\u043d\u0442\u0430\u043b\u044c\u043d\u044b\u0439 section<\/td><td>\u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442-\u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u0435, rotation time and cumulative \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c<\/td><td class=\"has-text-align-center\" data-align=\"center\">G105 \/ S135<\/td><\/tr><tr><td>Severe dogleg or high build rate<\/td><td>Upset-transition and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435-side \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u043a\u043b\u0430\u0441\u0441 plus detailed \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c review<\/td><\/tr><tr><td>ERD profile<\/td><td>Combined tension, \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442, \u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u0435 and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 loading<\/td><td class=\"has-text-align-center\" data-align=\"center\">S135 or <a href=\"__PROTECTED_0__\">special material route<\/a><\/td><\/tr><tr><td>Restricted bore or tool passage<\/td><td>\u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 ID, upset type and drift dia\u043c\u0435\u0442\u0440<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u043a\u043b\u0430\u0441\u0441 plus dimensional review<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\"><strong>X95 Drill Pipe<\/strong> remains suitable for controlled directional sections where tensile load, rotary torque and dogleg exposure remain within its verified margin. <strong>G105 Drill Pipe for directional drilling<\/strong> is commonly reviewed when combined tension and torque increase but fatigue and connection demand remain controlled. <strong>S135 Drill Pipe<\/strong> enters the review when long lateral rotation, ERD torque-drag or severe bending reduces the remaining G105 margin.<\/p>\n\n<p class=\"wp-block-paragraph\">The final selection should confirm that the \u0442\u0440\u0443\u0431\u0430 body, upset transition, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 support the same load path. A higher \u043a\u043b\u0430\u0441\u0441 does not correct insufficient \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442, restricted internal clearance or \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c-sensitive geometry.<\/p>\n\n<div data-wp-interactive=\"core\/file\" class=\"wp-block-file\"><object data-wp-bind--hidden=\"!state.hasPdfPreview\" hidden class=\"wp-block-file__embed\" data=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/Directional-Well-Drill-Pipe-Grade-Selection-by-Torque-Dogleg-and-Fatigue.pdf\" type=\"application\/pdf\" style=\"width:100%;height:600px\" aria-label=\"\u0412\u0441\u0442\u0430\u0432\u043a\u0430 Directional Well Drill Pipe Grade Selection by Torque, Dogleg and Fatigue\"><\/object><a id=\"wp-block-file--media-f2195319-0ba7-45b1-94d5-202657bb91e5\" href=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/Directional-Well-Drill-Pipe-Grade-Selection-by-Torque-Dogleg-and-Fatigue.pdf\">Directional \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043a\u043b\u0430\u0441\u0441 Selection by \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442, Dogleg and \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c<\/a><a href=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/Directional-Well-Drill-Pipe-Grade-Selection-by-Torque-Dogleg-and-Fatigue.pdf\" class=\"wp-block-file__button wp-element-button\" download=\"\" aria-describedby=\"wp-block-file--media-f2195319-0ba7-45b1-94d5-202657bb91e5\">Download<\/a><\/div>\n\n<h2 class=\"wp-block-heading\">G105 vs S135 for Deep and Directional \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s<\/h2>\n\n<p class=\"wp-block-paragraph\">The difference between G105 and S135 extends beyond the 30 ksi increase in minimum \u043f\u0440\u0435\u0434\u0435\u043b \u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438. The selection boundary depends on where the first mechanical limit occurs in the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430.<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Selection Factor<\/th><th>G105 Review Basis<\/th><th>S135 Review Basis<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">\u043a\u0440\u044e\u043a load<\/td><td>G105 retains adequate calculated tensile margin<\/td><td>\u043a\u0440\u044e\u043a load approaches the reviewed G105 margin<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Deep-\u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 profile<\/td><td>Higher axial load with controlled \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 demand<\/td><td>Higher \u043a\u043e\u043b\u043e\u043d\u043d\u0430 load or reduced G105 margin<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Directional profile<\/td><td>Controlled dogleg, \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442-\u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u0435 and rotation exposure<\/td><td>Long lateral, ERD or stronger combined loading<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442<\/td><td>\u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 and shoulder remain within the reviewed range<\/td><td>Higher \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 requires matched \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 and shoulder capacity<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c<\/td><td>Rotation and bending exposure remain controlled<\/td><td>Long rotation or severe bending requires closer \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c review<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Service condition<\/td><td>\u0441\u0432\u0435\u0447\u0430ard environment without governing sour or low-temperature requirement<\/td><td>Strength review combined with hardness, toughness and service qualification<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Documentation<\/td><td>\u0441\u0432\u0435\u0447\u0430ard mechanical test and inspection package<\/td><td>Closer review of hardness, i\u041c\u041f\u0430ct, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 and traceability records<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">For <strong>G105 vs S135 for \u0433\u043b\u0443\u0431\u043e\u043a\u0430\u044f \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s<\/strong>, the main dividing point is the available tensile margin after \u043a\u043e\u043b\u043e\u043d\u043d\u0430 \u0432\u0435\u0441, \u043a\u0440\u044e\u043a load and planned overpull are included.<\/p>\n\n<p class=\"wp-block-paragraph\">For <strong>G105 vs S135 for directional \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s<\/strong>, the dividing point also includes \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442-\u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u0435, dogleg severity, lateral length, rotation exposure and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 capacity.<\/p>\n\n<p class=\"wp-block-paragraph\"><strong><a href=\"https:\/\/www.drillpipes.com\/ru\/%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%b0%d1%8f-%d1%82%d1%80%d1%83%d0%b1%d0%b0-s135\/\">S135 Drill Pipe for ERD<\/a><\/strong> provides a higher pipe-body strength window, but ERD performance still depends on tool joint matching, connection torque, fatigue resistance and dimensional control. A stronger pipe body does not correct an undersized tool joint, damaged shoulder or fatigue-sensitive upset transition.<\/p>\n\n<h2 class=\"wp-block-heading\">When X95 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 Is Still Enough<\/h2>\n\n<p class=\"wp-block-paragraph\"><strong><a href=\"https:\/\/www.drillpipes.com\/ru\/%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%b0%d1%8f-%d1%82%d1%80%d1%83%d0%b1%d0%b0-x95\/\">X95 Drill Pipe<\/a><\/strong> remains suitable for medium-depth directional wells where build and hold sections are controlled, lateral length is limited, and calculated tensile, torque and overpull margins remain adequate. The review should also confirm that dogleg severity, cumulative rotation and connection demand remain within the standard operating range.<\/p>\n\n<p class=\"wp-block-paragraph\">Moving to G105 or S135 does not correct restrictions caused by \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u0438\u0437\u043d\u043e\u0441, poor shoulder contact, limited internal clearance or incomplete inspection records. X95 should remain in the \u043a\u043b\u0430\u0441\u0441 review when \u0442\u0440\u0443\u0431\u0430-body strength is not the controlling limit.<\/p>\n\n<h2 class=\"wp-block-heading\">\u043a\u043b\u0430\u0441\u0441 Selection Must Match \u0442\u0440\u0443\u0431\u0430 Design and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 Capacity<\/h2>\n\n<p class=\"wp-block-paragraph\">An <a href=\"__PROTECTED_0__\">API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430<\/a> specification must match the \u0442\u0440\u0443\u0431\u0430-body \u043a\u043b\u0430\u0441\u0441 with OD, \u0442\u043e\u043b\u0449\u0438\u043d\u0430 \u0441\u0442\u0435\u043d\u043a\u0438, upset geometry, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 dimensions and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 capacity. OD and \u0442\u043e\u043b\u0449\u0438\u043d\u0430 \u0441\u0442\u0435\u043d\u043a\u0438 determine the tensile area, while the upset, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435, \u0440\u0435\u0437\u044c\u0431\u0430 and shoulder control internal clearance and \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 transfer. A higher \u043a\u043b\u0430\u0441\u0441 adds little value when one of these areas becomes the first mechanical limit.<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Review Area<\/th><th>Why It Matters<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">OD, \u0442\u043e\u043b\u0449\u0438\u043d\u0430 \u0441\u0442\u0435\u043d\u043a\u0438 and nominal \u0432\u0435\u0441<\/td><td>Control tensile area, \u043a\u043e\u043b\u043e\u043d\u043d\u0430 \u0432\u0435\u0441, \u043a\u0440\u044e\u043a load and internal clearance<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><a href=\"https:\/\/www.drillpipes.com\/ru\/ieu-eu-%d0%b8-iu-%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%b0%d1%8f-%d1%82%d1%80%d1%83%d0%b1%d0%b0-%d1%87%d1%82%d0%be-%d0%b8%d0%b7%d0%bc%d0%b5%d0%bd%d1%8f%d0%b5%d1%82-%d1%82%d0%b8%d0%bf-%d1%83\/\">IU \/ EU \/ IEU upset<\/a><\/td><td>Change end geometry, local bore and \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c-sensitive transition shape<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 OD \/ ID<\/td><td>Control \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 strength, external clearance, bore area and tool passage<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Drift dia\u043c\u0435\u0442\u0440<\/td><td>Confirms internal passage through the completed assembly<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 type and make-up \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442<\/td><td>Define \u0440\u0435\u0437\u044c\u0431\u0430 engagement, \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 transfer and operating limit<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Shoulder contact<\/td><td>Transfers compressive and torsional load across the \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Weld and transition areas<\/td><td>Require inspection because geometry changes concentrate cyclic stress<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0440\u0435\u0437\u044c\u0431\u0430 and gauge condition<\/td><td>Confirm \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 geometry and make-up co\u041c\u041f\u0430tibility<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">For G105 and S135, the first mechanical limit can move from the \u0442\u0440\u0443\u0431\u0430 body to the upset transition, \u0442\u0440\u0435\u043d\u0438\u0435 weld, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 or \u0440\u0435\u0437\u044c\u0431\u0430 shoulder. A higher \u0442\u0440\u0443\u0431\u0430-body \u043a\u043b\u0430\u0441\u0441 adds little value when \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442, internal clearance or \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c-sensitive geometry does not support the same load case.<\/p>\n\n<p class=\"wp-block-paragraph\">An S135 \u0442\u0440\u0443\u0431\u0430 body does not create an S135-level \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 when the \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 or \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 controls the operating limit. \u0442\u0440\u0443\u0431\u0430-body tensile capacity and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 capacity must be reviewed as separate but connected parts of the same load path.<\/p>\n\n<h2 class=\"wp-block-heading\">\u043a\u043b\u0430\u0441\u0441 Selection Must Match \u0442\u0440\u0443\u0431\u0430 Design and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 Capacity<\/h2>\n\n<p class=\"wp-block-paragraph\">\u0442\u0440\u0443\u0431\u0430-body \u043a\u043b\u0430\u0441\u0441 cannot be reviewed separately from OD, \u0442\u043e\u043b\u0449\u0438\u043d\u0430 \u0441\u0442\u0435\u043d\u043a\u0438, upset geometry, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 dimensions and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 capacity. These items determine the metal area carrying tensile load, the internal clearance through the upset and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435, and the way \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 and bending load transfer through the complete assembly.<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Review Area<\/th><th>Why It Matters<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">OD, \u0442\u043e\u043b\u0449\u0438\u043d\u0430 \u0441\u0442\u0435\u043d\u043a\u0438 and nominal \u0432\u0435\u0441<\/td><td>Control tensile area, \u043a\u043e\u043b\u043e\u043d\u043d\u0430 \u0432\u0435\u0441, \u043a\u0440\u044e\u043a load and internal clearance<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">IU \/ EU \/ IEU upset<\/td><td>Change end geometry, local bore and \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c-sensitive transition shape<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 OD \/ ID<\/td><td>Control \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 strength, external clearance, bore area and tool passage<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Drift dia\u043c\u0435\u0442\u0440<\/td><td>Confirms internal passage through the completed assembly<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 type and make-up \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442<\/td><td>Define \u0440\u0435\u0437\u044c\u0431\u0430 engagement, \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 transfer and operating limit<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Shoulder contact<\/td><td>Transfers compressive and torsional load across the \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Weld and transition areas<\/td><td>Require inspection because geometry changes concentrate cyclic stress<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0440\u0435\u0437\u044c\u0431\u0430 and gauge condition<\/td><td>Confirm \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 geometry and make-up co\u041c\u041f\u0430tibility<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">For G105 and S135, the first mechanical limit can move from the \u0442\u0440\u0443\u0431\u0430 body to the upset transition, \u0442\u0440\u0435\u043d\u0438\u0435 weld, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 or \u0440\u0435\u0437\u044c\u0431\u0430 shoulder. A higher \u0442\u0440\u0443\u0431\u0430-body \u043a\u043b\u0430\u0441\u0441 adds little value when \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442, internal clearance or \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c-sensitive geometry does not support the same load case.<\/p>\n\n<p class=\"wp-block-paragraph\">An S135 \u0442\u0440\u0443\u0431\u0430 body does not create an S135-level \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 when the \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 or \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 controls the operating limit. \u0442\u0440\u0443\u0431\u0430-body tensile capacity and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 capacity must be reviewed as separate but connected parts of the same load path.<\/p>\n\n<h2 class=\"wp-block-heading\">API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043a\u043b\u0430\u0441\u0441 Selection Summary<\/h2>\n\n<p class=\"wp-block-paragraph\">The selected <a href=\"__PROTECTED_0__\">API 5DP \u043a\u043b\u0430\u0441\u0441 <\/a>is acceptable only when the controlling load, remaining \u0442\u0440\u0443\u0431\u0430-body margin, \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 capacity and inspection records support the same \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 configuration. Deep-\u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 selection focuses on \u043a\u0440\u044e\u043a load and overpull, while directional-\u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 selection also requires \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442-\u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u0435, dogleg \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 review.<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">\u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 Condition<\/th><th class=\"has-text-align-center\" data-align=\"center\">Initial \u043a\u043b\u0430\u0441\u0441 Range<\/th><th>Governing Review<\/th><th>Final Confirmation<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">Medium-depth directional \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430<\/td><td class=\"has-text-align-center\" data-align=\"center\">X95 \/ G105<\/td><td>\u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442, dogleg bending and tensile margin<\/td><td>\u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 capacity and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 condition<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0433\u043b\u0443\u0431\u043e\u043a\u0430\u044f \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430<\/td><td class=\"has-text-align-center\" data-align=\"center\">G105 \/ S135<\/td><td>Buoyed \u043a\u043e\u043b\u043e\u043d\u043d\u0430 \u0432\u0435\u0441, \u043a\u0440\u044e\u043a load and planned overpull<\/td><td>Remaining wall section and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 tensile capacity<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Long \u0433\u043e\u0440\u0438\u0437\u043e\u043d\u0442\u0430\u043b\u044c\u043d\u044b\u0439 \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430<\/td><td class=\"has-text-align-center\" data-align=\"center\">G105 \/ S135<\/td><td>\u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442-\u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u0435, rotation time and cumulative \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c<\/td><td>Upset transition, shoulder contact and \u0440\u0435\u0437\u044c\u0431\u0430 condition<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Severe dogleg section<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u043a\u043b\u0430\u0441\u0441 plus \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c review<\/td><td>Build rate, curvature and repeated bending cycles<\/td><td>Transition-area NDT and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 inspection<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">ERD \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430<\/td><td class=\"has-text-align-center\" data-align=\"center\">S135 or special material route<\/td><td>Combined tension, \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442, \u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u0435 and \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c<\/td><td>\u0442\u0440\u0443\u0431\u0430 body, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 must support the same load path<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">Deep-\u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 selection is governed mainly by axial tensile margin, while directional and ERD selection requires additional control of \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442-\u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u0435, dogleg \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435-side loading. The selected \u043a\u043b\u0430\u0441\u0441 should be supported by actual dimensions, load calculations and traceable inspection records.<\/p>\n\n<div class=\"wp-block-buttons is-content-justification-center is-layout-flex wp-container-core-buttons-is-layout-d61d70aa wp-block-buttons-is-layout-flex\">\n<div class=\"wp-block-button\"><a class=\"wp-block-button__link has-foreground-color has-secondary-background-color has-text-color has-background has-link-color wp-element-button\" href=\"https:\/\/www.drillpipes.com\/ru\/%d0%ba%d0%be%d0%bd%d1%82%d0%b0%d0%ba%d1%82%d1%8b\/\">Free quotation<\/a><\/div>\n<\/div>\n\n<h2 class=\"wp-block-heading\">FAQ<\/h2>\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>F1:Which API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043a\u043b\u0430\u0441\u0441 is normally selected for \u0433\u043b\u0443\u0431\u043e\u043a\u0430\u044f \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s?<\/summary>\n<p class=\"wp-block-paragraph\">Q1:<strong>G105 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430<\/strong> is commonly reviewed when the calculated upper-\u043a\u043e\u043b\u043e\u043d\u043d\u0430 tension and planned overpull exceed the practical range of X95. <strong>S135 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430<\/strong> enters the review when buoyed \u043a\u043e\u043b\u043e\u043d\u043d\u0430 \u0432\u0435\u0441, \u043a\u0440\u044e\u043a load and overpull reduce the remaining G105 margin. OD, \u0442\u043e\u043b\u0449\u0438\u043d\u0430 \u0441\u0442\u0435\u043d\u043a\u0438, \u0438\u0437\u043d\u043e\u0441 allowance and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 tensile capacity must be fixed before the two \u043a\u043b\u0430\u0441\u0441s are co\u041c\u041f\u0430red.<\/p>\n<\/details>\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>F2:Is G105 or S135 better for directional and \u0433\u043e\u0440\u0438\u0437\u043e\u043d\u0442\u0430\u043b\u044c\u043d\u044b\u0439 \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s?<\/summary>\n<p class=\"wp-block-paragraph\">Q2:G105 is suitable where \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442-\u0441\u043e\u043f\u0440\u043e\u0442\u0438\u0432\u043b\u0435\u043d\u0438\u0435, dogleg bending and cumulative rotation remain within the verified \u0442\u0440\u0443\u0431\u0430-body and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 margins. S135 is reviewed for longer laterals, ERD profiles or higher combined loading that reduces the available G105 margin. The higher \u043a\u043b\u0430\u0441\u0441 still requires matching \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435, shoulder and \u0440\u0435\u0437\u044c\u0431\u0430 capacity.<\/p>\n<\/details>\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>F3:Can S135 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 solve high \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 or severe dogleg conditions by itself?<\/summary>\n<p class=\"wp-block-paragraph\">Q3:No. S135 increases \u0442\u0440\u0443\u0431\u0430-body \u043f\u0440\u043e\u0447\u043d\u043e\u0441\u0442\u044c \u043d\u0430 \u0440\u0430\u0437\u0440\u044b\u0432, but it does not automatically increase \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 capacity or remove \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c concentration at the upset transition, weld area and \u0440\u0435\u0437\u044c\u0431\u0430 shoulder. High-\u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 or severe-dogleg service requires separate review of make-up \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442, shoulder contact, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 dimensions, rotation time and transition-area \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c.<\/p>\n<\/details>\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>F4:What records should support API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043a\u043b\u0430\u0441\u0441 selection?<\/summary>\n<p class=\"wp-block-paragraph\">Q4:The \u043a\u043b\u0430\u0441\u0441 should be supported by a traceable chain of <strong>\u0442\u0440\u0443\u0431\u0430 marking, heat number, MTC, tensile test, Charpy or hardness records where required, NDT, dimensional inspection, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 and \u0440\u0435\u0437\u044c\u0431\u0430 inspection, and final release records<\/strong>. These documents confirm that the selected \u043a\u043b\u0430\u0441\u0441, remaining wall section and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 refer to the same delivered \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430.<\/p>\n<\/details>\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-3 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"410\" data-id=\"12635\" src=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/05\/OCTAL-Certifications-1024x410.png\" alt=\"\" class=\"wp-image-12635\" srcset=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/05\/OCTAL-Certifications-1024x410.png 1024w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/05\/OCTAL-Certifications-300x120.png 300w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/05\/OCTAL-Certifications-2000x800.png 2000w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/figure>\n","protected":false},"excerpt":{"rendered":"<p>API 5DP Drill Pipe Grade Selection for deep and directional wells requires two different review paths. Deep-well selection is governed mainly by buoyed drill string weight, maximum hook load, planned overpull and the tensile capacity of the upper string. Directional-well selection adds torque-drag, dogleg-related bending, rotation time and fatigue near the upset transition, tool joint &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/www.drillpipes.com\/ru\/how-to-choose-api-5dp-%d0%b1%d1%83%d1%80%d0%b8%d0%bb%d1%8c%d0%bd%d0%b0%d1%8f-%d1%82%d1%80%d1%83%d0%b1%d0%b0-%d0%ba%d0%bb%d0%b0%d1%81%d1%81s-for-deep-and-directional-%d1%81%d0%ba%d0%b2%d0%b0%d0%b6\/\" class=\"more-link\">\u0427\u0438\u0442\u0430\u0442\u044c \u0434\u0430\u043b\u0435\u0435<span class=\"screen-reader-text\"> &#171;How to Choose API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043a\u043b\u0430\u0441\u0441s for Deep and Directional \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s&#187;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":15746,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","footnotes":""},"categories":[106],"tags":[],"class_list":["post-15742","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-106"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Choose API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043a\u043b\u0430\u0441\u0441s<\/title>\n<meta name=\"description\" content=\"Co\u041c\u041f\u0430re X95, G105 and S135 API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043a\u043b\u0430\u0441\u0441s for deep and directional \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s by load 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