{"id":15736,"date":"2026-06-16T11:39:20","date_gmt":"2026-06-16T03:39:20","guid":{"rendered":"https:\/\/www.drillpipes.com\/how-to-choose-api-5dp-%d8%a3%d9%86%d8%a8%d9%88%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1-%d8%a7%d9%84%d8%af%d8%b1%d8%ac%d8%a9s-for-deep-and-directional-%d8%a7%d9%84%d8%a8%d8%a6%d8%b1s\/"},"modified":"2026-09-18T16:02:56","modified_gmt":"2026-09-18T08:02:56","slug":"how-to-choose-api-5dp-%d8%a3%d9%86%d8%a8%d9%88%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1-%d8%a7%d9%84%d8%af%d8%b1%d8%ac%d8%a9s-for-deep-and-directional-%d8%a7%d9%84%d8%a8%d8%a6%d8%b1s","status":"publish","type":"post","link":"https:\/\/www.drillpipes.com\/ar\/how-to-choose-api-5dp-%d8%a3%d9%86%d8%a8%d9%88%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1-%d8%a7%d9%84%d8%af%d8%b1%d8%ac%d8%a9s-for-deep-and-directional-%d8%a7%d9%84%d8%a8%d8%a6%d8%b1s\/","title":{"rendered":"How to Choose API 5DP \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u062f\u0631\u062c\u0629s for Deep and Directional \u0627\u0644\u0628\u0626\u0631s"},"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 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631, G105 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 and S135 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631<\/strong> fit within these load conditions. X95 remains relevant where directional load and \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 are controlled, G105 covers many deeper or higher-load sections, and S135 is reviewed when \u0627\u0644\u062e\u0637\u0627\u0641 load, long lateral rotation or ERD loading exceeds the available G105 margin. \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 size, \u0633\u0645\u0627\u0643\u0629 \u0627\u0644\u062c\u062f\u0627\u0631, upset type, \u0627\u0644\u0648\u0635\u0644\u0629 capacity, service condition and inspection records must support the same \u0627\u0644\u062f\u0631\u062c\u0629 decision.<\/p>\n\n<h2 class=\"wp-block-heading\">Deep and Directional \u0627\u0644\u0628\u0626\u0631s Require Different \u0627\u0644\u062f\u0631\u062c\u0629 Logic<\/h2>\n\n<p class=\"wp-block-paragraph\">\u0628\u0626\u0631 \u0639\u0645\u064a\u0642s and directional \u0627\u0644\u0628\u0626\u0631s do not place the same demand on a \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631. In a predominantly \u0631\u0623\u0633\u064a \u0628\u0626\u0631 \u0639\u0645\u064a\u0642, the upper \u0627\u0644\u0648\u0635\u0644\u0629s carry the accumulated buoyed \u0627\u0644\u0648\u0632\u0646 of the \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631 together with planned overpull. The first \u0627\u0644\u062f\u0631\u062c\u0629-selection question is whether the selected \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 body, \u0633\u0645\u0627\u0643\u0629 \u0627\u0644\u062c\u062f\u0627\u0631 and \u0627\u0644\u0648\u0635\u0644\u0629 provide sufficient tensile margin.<\/p>\n\n<p class=\"wp-block-paragraph\">Directional \u0627\u0644\u0628\u0626\u0631s introduce a combined load path. A \u0627\u0644\u0648\u0635\u0644\u0629 rotating through a build section or dogleg carries axial tension while also transmitting \u0627\u0644\u062f\u0648\u0627\u0631 \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 and passing through repeated bending cycles. In a long \u0623\u0641\u0642\u064a interval, \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 and \u0627\u0644\u0633\u062d\u0628 accumulate over measured depth, while extended rotation increases \u0627\u0644\u062a\u0639\u0628 exposure near the upset transition, \u0627\u0644\u0627\u062d\u062a\u0643\u0627\u0643 weld, \u0627\u0644\u062e\u064a\u0637 shoulder and \u0627\u0644\u0648\u0635\u0644\u0629.<\/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\">\u0628\u0626\u0631 \u0639\u0645\u064a\u0642<\/th><th class=\"has-text-align-left\" data-align=\"left\">Directional or \u0623\u0641\u0642\u064a \u0627\u0644\u0628\u0626\u0631<\/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 \u0627\u0644\u062e\u0637\u0627\u0641 load<\/td><td class=\"has-text-align-left\" data-align=\"left\">Combined tension, \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, \u0627\u0644\u0633\u062d\u0628 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 \u0627\u0644\u0633\u0627\u0642 \u0627\u0644\u0648\u0632\u0646, overpull and tensile margin<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646-\u0627\u0644\u0633\u062d\u0628, 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-\u0627\u0644\u0633\u0627\u0642 tensile capacity<\/td><td class=\"has-text-align-left\" data-align=\"left\">Cyclic \u0627\u0644\u062a\u0639\u0628 and \u0627\u0644\u0648\u0635\u0644\u0629-side stress<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Common \u0627\u0644\u062f\u0631\u062c\u0629 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\">\u0627\u0644\u0648\u0635\u0644\u0629 tensile capacity<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u0627\u0644\u0648\u0635\u0644\u0629 \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, 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=\"\u062a\u0636\u0645\u064a\u0646 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 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u062f\u0631\u062c\u0629 Selection Matrix for Deep and Directional \u0627\u0644\u0628\u0626\u0631s<\/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 \u0628\u0626\u0631 \u0639\u0645\u064a\u0642s, the \u0627\u0644\u062f\u0631\u062c\u0629 boundary is set by buoyed \u0627\u0644\u0633\u0627\u0642 \u0627\u0644\u0648\u0632\u0646, maximum \u0627\u0644\u062e\u0637\u0627\u0641 load, planned overpull and the remaining tensile capacity after wall-loss allowance. Directional \u0627\u0644\u0628\u0626\u0631s require an additional review of \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646-\u0627\u0644\u0633\u062d\u0628, dogleg severity, rotation time and \u0627\u0644\u062a\u0639\u0628 concentration at the upset transition and \u0627\u0644\u0648\u0635\u0644\u0629. G105 remains suitable where the combined \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628-body and \u0627\u0644\u0648\u0635\u0644\u0629 margins are adequate; S135 enters the review when higher \u0627\u0644\u062e\u0637\u0627\u0641 load or long-lateral loading reduces those margins.<\/p>\n\n<h2 class=\"wp-block-heading\">API 5DP \u0627\u0644\u062f\u0631\u062c\u0629 Strength Baseline<\/h2>\n\n<p class=\"wp-block-paragraph\">API 5DP \u0627\u0644\u062f\u0631\u062c\u0629s are defined by specified yield and tensile limits for the \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 body. Minimum \u0645\u0642\u0627\u0648\u0645\u0629 \u0627\u0644\u062e\u0636\u0648\u0639 marks the start of permanent deformation, the maximum yield limit controls \u0627\u0644\u062f\u0631\u062c\u0629 consistency, and minimum \u0645\u0642\u0627\u0648\u0645\u0629 \u0627\u0644\u0634\u062f 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 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 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 \u0627\u0644\u062f\u0631\u062c\u0629<\/th><th class=\"has-text-align-center\" data-align=\"center\">Minimum \u0645\u0642\u0627\u0648\u0645\u0629 \u0627\u0644\u062e\u0636\u0648\u0639<\/th><th class=\"has-text-align-center\" data-align=\"center\">Maximum \u0645\u0642\u0627\u0648\u0645\u0629 \u0627\u0644\u062e\u0636\u0648\u0639<\/th><th class=\"has-text-align-center\" data-align=\"center\">Minimum \u0645\u0642\u0627\u0648\u0645\u0629 \u0627\u0644\u0634\u062f<\/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 MPa<\/td><td class=\"has-text-align-center\" data-align=\"center\">105 ksi \/ 724 MPa<\/td><td class=\"has-text-align-center\" data-align=\"center\">100 ksi \/ 689 MPa<\/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 MPa<\/td><td class=\"has-text-align-center\" data-align=\"center\">125 ksi \/ 862 MPa<\/td><td class=\"has-text-align-center\" data-align=\"center\">105 ksi \/ 724 MPa<\/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 MPa<\/td><td class=\"has-text-align-center\" data-align=\"center\">135 ksi \/ 931 MPa<\/td><td class=\"has-text-align-center\" data-align=\"center\">115 ksi \/ 793 MPa<\/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 MPa<\/td><td class=\"has-text-align-center\" data-align=\"center\">165 ksi \/ 1,138 MPa<\/td><td class=\"has-text-align-center\" data-align=\"center\">145 ksi \/ 1,000 MPa<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">\u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628-body tensile capacity is governed by \u0627\u0644\u062f\u0631\u062c\u0629 strength together with OD, \u0633\u0645\u0627\u0643\u0629 \u0627\u0644\u062c\u062f\u0627\u0631 and wall loss, so a worn or lighter-wall S135 \u0627\u0644\u0648\u0635\u0644\u0629 can retain less usable tensile margin than a thicker-wall G105 \u0627\u0644\u0648\u0635\u0644\u0629. Actual dimensions and \u0627\u0644\u062a\u0622\u0643\u0644 allowance should be confirmed before the \u0627\u0644\u062f\u0631\u062c\u0629 is matched to \u0627\u0644\u062e\u0637\u0627\u0641 load and planned overpull.<\/p>\n\n<h2 class=\"wp-block-heading\">How to Choose a \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u062f\u0631\u062c\u0629 for \u0628\u0626\u0631 \u0639\u0645\u064a\u0642s<\/h2>\n\n<p class=\"wp-block-paragraph\">Selection of <strong>API 5DP \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u062f\u0631\u062c\u0629s for \u0628\u0626\u0631 \u0639\u0645\u064a\u0642s<\/strong> begins with upper-\u0627\u0644\u0633\u0627\u0642 axial load. Total \u0631\u0623\u0633\u064a depth alone does not determine the \u0627\u0644\u062f\u0631\u062c\u0629. \u0627\u0644\u0628\u0626\u0631s with similar depth can require different \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 specifications because of differences in \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 size, \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631 configuration, \u0627\u0644\u062d\u0641\u0631-fluid density, BHA \u0627\u0644\u0648\u0632\u0646 and planned overpull.<\/p>\n\n<h3 class=\"wp-block-heading\">Calculate the Upper-\u0627\u0644\u0633\u0627\u0642 Load<\/h3>\n\n<p class=\"wp-block-paragraph\">The deep-\u0627\u0644\u0628\u0626\u0631 load review should include:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>buoyed \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0648\u0632\u0646<\/li>\n\n\n\n<li>maximum expected \u0627\u0644\u062e\u0637\u0627\u0641 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 \u0627\u0644\u0648\u0632\u0646<\/li>\n\n\n\n<li>remaining tensile design margin<\/li>\n\n\n\n<li>expected wall loss or \u0627\u0644\u062a\u0622\u0643\u0644 allowance<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">Buoyancy reduces the effective \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0648\u0632\u0646 in fluid, but the upper \u0627\u0644\u0648\u0635\u0644\u0629s still carry the accumulated load of the \u0627\u0644\u0633\u0627\u0642 below. Planned overpull also needs to be included because stuck-\u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 recovery places additional tension on the same upper section.<\/p>\n\n<h3 class=\"wp-block-heading\">Match the Load with \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628-Body Capacity<\/h3>\n\n<p class=\"wp-block-paragraph\">\u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628-body tensile capacity is determined by \u0627\u0644\u062f\u0631\u062c\u0629 strength, OD, \u0633\u0645\u0627\u0643\u0629 \u0627\u0644\u062c\u062f\u0627\u0631 and remaining metal area. A heavier-wall G105 \u0627\u0644\u0648\u0635\u0644\u0629 can provide greater tensile capacity than a lighter-wall S135 \u0627\u0644\u0648\u0635\u0644\u0629 of another size.<\/p>\n\n<p class=\"wp-block-paragraph\">The deep-\u0627\u0644\u0628\u0626\u0631 review should connect:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>\u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 body OD<\/li>\n\n\n\n<li>actual \u0633\u0645\u0627\u0643\u0629 \u0627\u0644\u062c\u062f\u0627\u0631<\/li>\n\n\n\n<li>nominal \u0627\u0644\u0648\u0632\u0646<\/li>\n\n\n\n<li>minimum \u0645\u0642\u0627\u0648\u0645\u0629 \u0627\u0644\u062e\u0636\u0648\u0639<\/li>\n\n\n\n<li>remaining wall after \u0627\u0644\u062a\u0622\u0643\u0644<\/li>\n\n\n\n<li>\u0627\u0644\u0648\u0635\u0644\u0629 tensile capacity<\/li>\n\n\n\n<li>\u0627\u0644\u0648\u0635\u0644\u0629 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-\u0627\u0644\u0628\u0626\u0631 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 \u0627\u0644\u062f\u0631\u062c\u0629 Review<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">Buoyed \u0627\u0644\u0633\u0627\u0642 \u0627\u0644\u0648\u0632\u0646<\/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 \u0627\u0644\u062e\u0637\u0627\u0641 load<\/td><td class=\"has-text-align-center\" data-align=\"center\">Upper-\u0627\u0644\u0633\u0627\u0642 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-\u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 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 \u0633\u0645\u0627\u0643\u0629 \u0627\u0644\u062c\u062f\u0627\u0631<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628-body metal area<\/td><td class=\"has-text-align-center\" data-align=\"center\">Changes capacity within the same \u0627\u0644\u062f\u0631\u062c\u0629<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0627\u0644\u0648\u0635\u0644\u0629 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 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628-body yield<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0627\u0644\u062a\u0622\u0643\u0644 allowance<\/td><td class=\"has-text-align-center\" data-align=\"center\">Remaining \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628-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-\u0627\u0644\u0628\u0626\u0631 \u0627\u0644\u062f\u0631\u062c\u0629 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\/ar\/%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. \u0627\u0644\u062f\u0631\u062c\u0629 selection should be based on the actual \u0627\u0644\u0633\u0627\u0642 configuration, \u0633\u0645\u0627\u0643\u0629 \u0627\u0644\u062c\u062f\u0627\u0631, \u0627\u0644\u062a\u0622\u0643\u0644 allowance and \u0627\u0644\u0648\u0635\u0644\u0629 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=\"\u062a\u0636\u0645\u064a\u0646 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-\u0627\u0644\u0628\u0626\u0631 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u062f\u0631\u062c\u0629 Selection and Upper-\u0627\u0644\u0633\u0627\u0642 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 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u062f\u0631\u062c\u0629 for Directional \u0627\u0644\u0628\u0626\u0631s<\/h2>\n\n<p class=\"wp-block-paragraph\">Selecting a <strong>\u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u062f\u0631\u062c\u0629 for \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0627\u062a\u062c\u0627\u0647\u064a<\/strong> requires the load path to be reviewed by \u0627\u0644\u0628\u0626\u0631 section. Total measured depth alone does not represent \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 demand: the \u0631\u0623\u0633\u064a section is dominated by axial tension, build and drop sections introduce repeated bending, and the hold or \u0623\u0641\u0642\u064a section combines \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, \u0627\u0644\u0633\u062d\u0628, \u0628\u0626\u0631 \u0627\u0644\u0628\u0626\u0631 contact and cumulative \u0627\u0644\u062a\u0639\u0628.<\/p>\n\n<h3 class=\"wp-block-heading\">Load Path by \u0627\u0644\u0628\u0626\u0631 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\">\u0627\u0644\u0628\u0626\u0631 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\">\u0631\u0623\u0633\u064a section<\/td><td class=\"has-text-align-center\" data-align=\"center\">Axial tension and \u0627\u0644\u062e\u0637\u0627\u0641 load<\/td><td>Buoyed \u0627\u0644\u0633\u0627\u0642 \u0627\u0644\u0648\u0632\u0646, overpull margin and \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628-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 \u0627\u0644\u062a\u0639\u0628<\/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, \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 and \u0627\u0644\u0633\u062d\u0628<\/td><td>Pick-up \/ slack-off load, \u0627\u0644\u062f\u0648\u0627\u0631 \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 and \u0627\u0644\u0648\u0635\u0644\u0629 capacity<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0623\u0641\u0642\u064a lateral<\/td><td class=\"has-text-align-center\" data-align=\"center\">Sustained \u0627\u0644\u0633\u062d\u0628, contact and cumulative rotation<\/td><td>\u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 accumulation, \u0627\u0644\u062a\u0622\u0643\u0644, \u0627\u0644\u062a\u0639\u0628 exposure and \u0627\u0644\u0648\u0635\u0644\u0629 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 \u0627\u0644\u062f\u0631\u062c\u0629 review should follow the most severe section of the trajectory. A \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 that has enough tensile margin in the \u0631\u0623\u0633\u064a section can still be limited by bending \u0627\u0644\u062a\u0639\u0628 in the build section or by \u0627\u0644\u0648\u0635\u0644\u0629 \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 in the lateral interval.<\/p>\n\n<h3 class=\"wp-block-heading\">\u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, Dogleg and \u0627\u0644\u062a\u0639\u0628 Review<\/h3>\n\n<p class=\"wp-block-paragraph\">\u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646-\u0627\u0644\u0633\u062d\u0628 analysis should coMPare <strong>pick-up load, slack-off load, rotating load, sliding load and maximum \u0627\u0644\u062f\u0648\u0627\u0631 \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646<\/strong> with the \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628-body and \u0627\u0644\u0648\u0635\u0644\u0629 limits. \u0627\u0644\u0648\u0635\u0644\u0629 geometry, shoulder contact, \u0627\u0644\u062e\u064a\u0637 condition and make-up \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 determine the \u0627\u0644\u0648\u0635\u0644\u0629-side capacity; increasing the \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628-body \u0627\u0644\u062f\u0631\u062c\u0629 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. \u0627\u0644\u062a\u0639\u0628 demand concentrates near:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>the \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628-body-to-upset transition<\/li>\n\n\n\n<li>the \u0627\u0644\u0627\u062d\u062a\u0643\u0627\u0643-weld area<\/li>\n\n\n\n<li>the \u0627\u0644\u0648\u0635\u0644\u0629 transition<\/li>\n\n\n\n<li>the \u0627\u0644\u062e\u064a\u0637 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 \u0628\u0626\u0631 \u0627\u0644\u0628\u0626\u0631 contact, accumulated \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646-\u0627\u0644\u0633\u062d\u0628, abrasive \u0627\u0644\u062a\u0622\u0643\u0644 and repeated rotation. These conditions require \u0627\u0644\u062a\u0639\u0628 and \u0627\u0644\u0648\u0635\u0644\u0629 review even when the calculated axial stress remains below the \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628-body yield limit.<\/p>\n\n<h3 class=\"wp-block-heading\">Directional-\u0627\u0644\u0628\u0626\u0631 \u0627\u0644\u062f\u0631\u062c\u0629 Boundary<\/h3>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Directional-\u0627\u0644\u0628\u0626\u0631 Condition<\/th><th>Main Control Point<\/th><th class=\"has-text-align-center\" data-align=\"center\">Common \u0627\u0644\u062f\u0631\u062c\u0629 Review<\/th><\/tr><\/thead><tbody><tr><td>Short directional section with moderate dogleg<\/td><td>Tensile margin and \u0627\u0644\u0634\u0639\u0644\u0629ard \u0627\u0644\u0648\u0635\u0644\u0629 condition<\/td><td class=\"has-text-align-center\" data-align=\"center\">X95 \/ G105<\/td><\/tr><tr><td>Higher \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 with controlled bending exposure<\/td><td>\u0627\u0644\u0648\u0635\u0644\u0629 \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 capacity and shoulder contact<\/td><td class=\"has-text-align-center\" data-align=\"center\">G105<\/td><\/tr><tr><td>Long \u0623\u0641\u0642\u064a section<\/td><td>\u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646-\u0627\u0644\u0633\u062d\u0628, rotation time and cumulative \u0627\u0644\u062a\u0639\u0628<\/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 \u0627\u0644\u0648\u0635\u0644\u0629-side \u0627\u0644\u062a\u0639\u0628<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u0627\u0644\u062f\u0631\u062c\u0629 plus detailed \u0627\u0644\u062a\u0639\u0628 review<\/td><\/tr><tr><td>ERD profile<\/td><td>Combined tension, \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, \u0627\u0644\u0633\u062d\u0628 and \u0627\u0644\u0648\u0635\u0644\u0629 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>\u0627\u0644\u0648\u0635\u0644\u0629 ID, upset type and drift dia\u0645\u062a\u0631<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u0627\u0644\u062f\u0631\u062c\u0629 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 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 body, upset transition, \u0627\u0644\u0648\u0635\u0644\u0629 and \u0627\u0644\u0648\u0635\u0644\u0629 support the same load path. A higher \u0627\u0644\u062f\u0631\u062c\u0629 does not correct insufficient \u0627\u0644\u0648\u0635\u0644\u0629 \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, restricted internal clearance or \u0627\u0644\u062a\u0639\u0628-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=\"\u062a\u0636\u0645\u064a\u0646 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 \u0627\u0644\u0628\u0626\u0631 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u062f\u0631\u062c\u0629 Selection by \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, Dogleg and \u0627\u0644\u062a\u0639\u0628<\/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 \u0627\u0644\u0628\u0626\u0631s<\/h2>\n\n<p class=\"wp-block-paragraph\">The difference between G105 and S135 extends beyond the 30 ksi increase in minimum \u0645\u0642\u0627\u0648\u0645\u0629 \u0627\u0644\u062e\u0636\u0648\u0639. The selection boundary depends on where the first mechanical limit occurs in the \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631.<\/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\">\u0627\u0644\u062e\u0637\u0627\u0641 load<\/td><td>G105 retains adequate calculated tensile margin<\/td><td>\u0627\u0644\u062e\u0637\u0627\u0641 load approaches the reviewed G105 margin<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Deep-\u0627\u0644\u0628\u0626\u0631 profile<\/td><td>Higher axial load with controlled \u0627\u0644\u0648\u0635\u0644\u0629 demand<\/td><td>Higher \u0627\u0644\u0633\u0627\u0642 load or reduced G105 margin<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Directional profile<\/td><td>Controlled dogleg, \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646-\u0627\u0644\u0633\u062d\u0628 and rotation exposure<\/td><td>Long lateral, ERD or stronger combined loading<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646<\/td><td>\u0627\u0644\u0648\u0635\u0644\u0629 and shoulder remain within the reviewed range<\/td><td>Higher \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 requires matched \u0627\u0644\u0648\u0635\u0644\u0629 and shoulder capacity<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0627\u0644\u062a\u0639\u0628<\/td><td>Rotation and bending exposure remain controlled<\/td><td>Long rotation or severe bending requires closer \u0627\u0644\u062a\u0639\u0628 review<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Service condition<\/td><td>\u0627\u0644\u0634\u0639\u0644\u0629ard 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>\u0627\u0644\u0634\u0639\u0644\u0629ard mechanical test and inspection package<\/td><td>Closer review of hardness, iMPact, \u0627\u0644\u0648\u0635\u0644\u0629 and traceability records<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">For <strong>G105 vs S135 for \u0628\u0626\u0631 \u0639\u0645\u064a\u0642s<\/strong>, the main dividing point is the available tensile margin after \u0627\u0644\u0633\u0627\u0642 \u0627\u0644\u0648\u0632\u0646, \u0627\u0644\u062e\u0637\u0627\u0641 load and planned overpull are included.<\/p>\n\n<p class=\"wp-block-paragraph\">For <strong>G105 vs S135 for directional \u0627\u0644\u0628\u0626\u0631s<\/strong>, the dividing point also includes \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646-\u0627\u0644\u0633\u062d\u0628, dogleg severity, lateral length, rotation exposure and \u0627\u0644\u0648\u0635\u0644\u0629 capacity.<\/p>\n\n<p class=\"wp-block-paragraph\"><strong><a href=\"https:\/\/www.drillpipes.com\/ar\/%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 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 Is Still Enough<\/h2>\n\n<p class=\"wp-block-paragraph\"><strong><a href=\"https:\/\/www.drillpipes.com\/ar\/%d8%a3%d9%86%d8%a8%d9%88%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1-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 \u0627\u0644\u0648\u0635\u0644\u0629 \u0627\u0644\u062a\u0622\u0643\u0644, poor shoulder contact, limited internal clearance or incomplete inspection records. X95 should remain in the \u0627\u0644\u062f\u0631\u062c\u0629 review when \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628-body strength is not the controlling limit.<\/p>\n\n<h2 class=\"wp-block-heading\">\u0627\u0644\u062f\u0631\u062c\u0629 Selection Must Match \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 Design and \u0627\u0644\u0648\u0635\u0644\u0629 Capacity<\/h2>\n\n<p class=\"wp-block-paragraph\">An <a href=\"__PROTECTED_0__\">API 5DP \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631<\/a> specification must match the \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628-body \u0627\u0644\u062f\u0631\u062c\u0629 with OD, \u0633\u0645\u0627\u0643\u0629 \u0627\u0644\u062c\u062f\u0627\u0631, upset geometry, \u0627\u0644\u0648\u0635\u0644\u0629 dimensions and \u0627\u0644\u0648\u0635\u0644\u0629 capacity. OD and \u0633\u0645\u0627\u0643\u0629 \u0627\u0644\u062c\u062f\u0627\u0631 determine the tensile area, while the upset, \u0627\u0644\u0648\u0635\u0644\u0629, \u0627\u0644\u062e\u064a\u0637 and shoulder control internal clearance and \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 transfer. A higher \u0627\u0644\u062f\u0631\u062c\u0629 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, \u0633\u0645\u0627\u0643\u0629 \u0627\u0644\u062c\u062f\u0627\u0631 and nominal \u0627\u0644\u0648\u0632\u0646<\/td><td>Control tensile area, \u0627\u0644\u0633\u0627\u0642 \u0627\u0644\u0648\u0632\u0646, \u0627\u0644\u062e\u0637\u0627\u0641 load and internal clearance<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><a href=\"https:\/\/www.drillpipes.com\/ar\/ieu-%d9%88-eu-%d9%88-iu-%d8%a3%d9%86%d8%a7%d8%a8%d9%8a%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1-%d9%85%d8%a7-%d8%a7%d9%84%d8%b0%d9%8a-%d9%8a%d8%ba%d9%8a%d8%b1%d9%87-%d9%86%d9%88%d8%b9-%d8%a7%d9%84%d8%aa\/\">IU \/ EU \/ IEU upset<\/a><\/td><td>Change end geometry, local bore and \u0627\u0644\u062a\u0639\u0628-sensitive transition shape<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0627\u0644\u0648\u0635\u0644\u0629 OD \/ ID<\/td><td>Control \u0627\u0644\u0648\u0635\u0644\u0629 strength, external clearance, bore area and tool passage<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Drift dia\u0645\u062a\u0631<\/td><td>Confirms internal passage through the completed assembly<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0627\u0644\u0648\u0635\u0644\u0629 type and make-up \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646<\/td><td>Define \u0627\u0644\u062e\u064a\u0637 engagement, \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 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 \u0627\u0644\u0648\u0635\u0644\u0629<\/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\">\u0627\u0644\u062e\u064a\u0637 and gauge condition<\/td><td>Confirm \u0627\u0644\u0648\u0635\u0644\u0629 geometry and make-up coMPatibility<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">For G105 and S135, the first mechanical limit can move from the \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 body to the upset transition, \u0627\u0644\u0627\u062d\u062a\u0643\u0627\u0643 weld, \u0627\u0644\u0648\u0635\u0644\u0629 or \u0627\u0644\u062e\u064a\u0637 shoulder. A higher \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628-body \u0627\u0644\u062f\u0631\u062c\u0629 adds little value when \u0627\u0644\u0648\u0635\u0644\u0629 \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, internal clearance or \u0627\u0644\u062a\u0639\u0628-sensitive geometry does not support the same load case.<\/p>\n\n<p class=\"wp-block-paragraph\">An S135 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 body does not create an S135-level \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631 when the \u0627\u0644\u0648\u0635\u0644\u0629 or \u0627\u0644\u0648\u0635\u0644\u0629 controls the operating limit. \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628-body tensile capacity and \u0627\u0644\u0648\u0635\u0644\u0629 \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 capacity must be reviewed as separate but connected parts of the same load path.<\/p>\n\n<h2 class=\"wp-block-heading\">\u0627\u0644\u062f\u0631\u062c\u0629 Selection Must Match \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 Design and \u0627\u0644\u0648\u0635\u0644\u0629 Capacity<\/h2>\n\n<p class=\"wp-block-paragraph\">\u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628-body \u0627\u0644\u062f\u0631\u062c\u0629 cannot be reviewed separately from OD, \u0633\u0645\u0627\u0643\u0629 \u0627\u0644\u062c\u062f\u0627\u0631, upset geometry, \u0627\u0644\u0648\u0635\u0644\u0629 dimensions and \u0627\u0644\u0648\u0635\u0644\u0629 capacity. These items determine the metal area carrying tensile load, the internal clearance through the upset and \u0627\u0644\u0648\u0635\u0644\u0629, and the way \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 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, \u0633\u0645\u0627\u0643\u0629 \u0627\u0644\u062c\u062f\u0627\u0631 and nominal \u0627\u0644\u0648\u0632\u0646<\/td><td>Control tensile area, \u0627\u0644\u0633\u0627\u0642 \u0627\u0644\u0648\u0632\u0646, \u0627\u0644\u062e\u0637\u0627\u0641 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 \u0627\u0644\u062a\u0639\u0628-sensitive transition shape<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0627\u0644\u0648\u0635\u0644\u0629 OD \/ ID<\/td><td>Control \u0627\u0644\u0648\u0635\u0644\u0629 strength, external clearance, bore area and tool passage<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Drift dia\u0645\u062a\u0631<\/td><td>Confirms internal passage through the completed assembly<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0627\u0644\u0648\u0635\u0644\u0629 type and make-up \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646<\/td><td>Define \u0627\u0644\u062e\u064a\u0637 engagement, \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 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 \u0627\u0644\u0648\u0635\u0644\u0629<\/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\">\u0627\u0644\u062e\u064a\u0637 and gauge condition<\/td><td>Confirm \u0627\u0644\u0648\u0635\u0644\u0629 geometry and make-up coMPatibility<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">For G105 and S135, the first mechanical limit can move from the \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 body to the upset transition, \u0627\u0644\u0627\u062d\u062a\u0643\u0627\u0643 weld, \u0627\u0644\u0648\u0635\u0644\u0629 or \u0627\u0644\u062e\u064a\u0637 shoulder. A higher \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628-body \u0627\u0644\u062f\u0631\u062c\u0629 adds little value when \u0627\u0644\u0648\u0635\u0644\u0629 \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, internal clearance or \u0627\u0644\u062a\u0639\u0628-sensitive geometry does not support the same load case.<\/p>\n\n<p class=\"wp-block-paragraph\">An S135 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 body does not create an S135-level \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631 when the \u0627\u0644\u0648\u0635\u0644\u0629 or \u0627\u0644\u0648\u0635\u0644\u0629 controls the operating limit. \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628-body tensile capacity and \u0627\u0644\u0648\u0635\u0644\u0629 \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 capacity must be reviewed as separate but connected parts of the same load path.<\/p>\n\n<h2 class=\"wp-block-heading\">API 5DP \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u062f\u0631\u062c\u0629 Selection Summary<\/h2>\n\n<p class=\"wp-block-paragraph\">The selected <a href=\"__PROTECTED_0__\">API 5DP \u0627\u0644\u062f\u0631\u062c\u0629 <\/a>is acceptable only when the controlling load, remaining \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628-body margin, \u0627\u0644\u0648\u0635\u0644\u0629 capacity and inspection records support the same \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631 configuration. Deep-\u0627\u0644\u0628\u0626\u0631 selection focuses on \u0627\u0644\u062e\u0637\u0627\u0641 load and overpull, while directional-\u0627\u0644\u0628\u0626\u0631 selection also requires \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646-\u0627\u0644\u0633\u062d\u0628, dogleg \u0627\u0644\u062a\u0639\u0628 and \u0627\u0644\u0648\u0635\u0644\u0629 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\">\u0627\u0644\u0628\u0626\u0631 Condition<\/th><th class=\"has-text-align-center\" data-align=\"center\">Initial \u0627\u0644\u062f\u0631\u062c\u0629 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 \u0627\u0644\u0628\u0626\u0631<\/td><td class=\"has-text-align-center\" data-align=\"center\">X95 \/ G105<\/td><td>\u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, dogleg bending and tensile margin<\/td><td>\u0627\u0644\u0648\u0635\u0644\u0629 capacity and \u0627\u0644\u0648\u0635\u0644\u0629 condition<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0628\u0626\u0631 \u0639\u0645\u064a\u0642<\/td><td class=\"has-text-align-center\" data-align=\"center\">G105 \/ S135<\/td><td>Buoyed \u0627\u0644\u0633\u0627\u0642 \u0627\u0644\u0648\u0632\u0646, \u0627\u0644\u062e\u0637\u0627\u0641 load and planned overpull<\/td><td>Remaining wall section and \u0627\u0644\u0648\u0635\u0644\u0629 tensile capacity<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Long \u0623\u0641\u0642\u064a \u0627\u0644\u0628\u0626\u0631<\/td><td class=\"has-text-align-center\" data-align=\"center\">G105 \/ S135<\/td><td>\u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646-\u0627\u0644\u0633\u062d\u0628, rotation time and cumulative \u0627\u0644\u062a\u0639\u0628<\/td><td>Upset transition, shoulder contact and \u0627\u0644\u062e\u064a\u0637 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\">\u0627\u0644\u062f\u0631\u062c\u0629 plus \u0627\u0644\u062a\u0639\u0628 review<\/td><td>Build rate, curvature and repeated bending cycles<\/td><td>Transition-area NDT and \u0627\u0644\u0648\u0635\u0644\u0629 inspection<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">ERD \u0627\u0644\u0628\u0626\u0631<\/td><td class=\"has-text-align-center\" data-align=\"center\">S135 or special material route<\/td><td>Combined tension, \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, \u0627\u0644\u0633\u062d\u0628 and \u0627\u0644\u062a\u0639\u0628<\/td><td>\u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 body, \u0627\u0644\u0648\u0635\u0644\u0629 and \u0627\u0644\u0648\u0635\u0644\u0629 must support the same load path<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">Deep-\u0627\u0644\u0628\u0626\u0631 selection is governed mainly by axial tensile margin, while directional and ERD selection requires additional control of \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646-\u0627\u0644\u0633\u062d\u0628, dogleg \u0627\u0644\u062a\u0639\u0628 and \u0627\u0644\u0648\u0635\u0644\u0629-side loading. The selected \u0627\u0644\u062f\u0631\u062c\u0629 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\/ar\/%d8%a7%d8%aa%d8%b5%d9%84-%d8%a8%d9%86%d8%a7\/\">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 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u062f\u0631\u062c\u0629 is normally selected for \u0628\u0626\u0631 \u0639\u0645\u064a\u0642s?<\/summary>\n<p class=\"wp-block-paragraph\">Q1:<strong>G105 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631<\/strong> is commonly reviewed when the calculated upper-\u0627\u0644\u0633\u0627\u0642 tension and planned overpull exceed the practical range of X95. <strong>S135 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631<\/strong> enters the review when buoyed \u0627\u0644\u0633\u0627\u0642 \u0627\u0644\u0648\u0632\u0646, \u0627\u0644\u062e\u0637\u0627\u0641 load and overpull reduce the remaining G105 margin. OD, \u0633\u0645\u0627\u0643\u0629 \u0627\u0644\u062c\u062f\u0627\u0631, \u0627\u0644\u062a\u0622\u0643\u0644 allowance and \u0627\u0644\u0648\u0635\u0644\u0629 tensile capacity must be fixed before the two \u0627\u0644\u062f\u0631\u062c\u0629s are coMPared.<\/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 \u0623\u0641\u0642\u064a \u0627\u0644\u0628\u0626\u0631s?<\/summary>\n<p class=\"wp-block-paragraph\">Q2:G105 is suitable where \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646-\u0627\u0644\u0633\u062d\u0628, dogleg bending and cumulative rotation remain within the verified \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628-body and \u0627\u0644\u0648\u0635\u0644\u0629 margins. S135 is reviewed for longer laterals, ERD profiles or higher combined loading that reduces the available G105 margin. The higher \u0627\u0644\u062f\u0631\u062c\u0629 still requires matching \u0627\u0644\u0648\u0635\u0644\u0629, shoulder and \u0627\u0644\u062e\u064a\u0637 capacity.<\/p>\n<\/details>\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>F3:Can S135 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 solve high \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 or severe dogleg conditions by itself?<\/summary>\n<p class=\"wp-block-paragraph\">Q3:No. S135 increases \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628-body \u0645\u0642\u0627\u0648\u0645\u0629 \u0627\u0644\u0634\u062f, but it does not automatically increase \u0627\u0644\u0648\u0635\u0644\u0629 \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 capacity or remove \u0627\u0644\u062a\u0639\u0628 concentration at the upset transition, weld area and \u0627\u0644\u062e\u064a\u0637 shoulder. High-\u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 or severe-dogleg service requires separate review of make-up \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, shoulder contact, \u0627\u0644\u0648\u0635\u0644\u0629 dimensions, rotation time and transition-area \u0627\u0644\u062a\u0639\u0628.<\/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 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u062f\u0631\u062c\u0629 selection?<\/summary>\n<p class=\"wp-block-paragraph\">Q4:The \u0627\u0644\u062f\u0631\u062c\u0629 should be supported by a traceable chain of <strong>\u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 marking, heat number, MTC, tensile test, Charpy or hardness records where required, NDT, dimensional inspection, \u0627\u0644\u0648\u0635\u0644\u0629 and \u0627\u0644\u062e\u064a\u0637 inspection, and final release records<\/strong>. These documents confirm that the selected \u0627\u0644\u062f\u0631\u062c\u0629, remaining wall section and \u0627\u0644\u0648\u0635\u0644\u0629 refer to the same delivered \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631.<\/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\/ar\/how-to-choose-api-5dp-%d8%a3%d9%86%d8%a8%d9%88%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1-%d8%a7%d9%84%d8%af%d8%b1%d8%ac%d8%a9s-for-deep-and-directional-%d8%a7%d9%84%d8%a8%d8%a6%d8%b1s\/\" class=\"more-link\">Read more<span class=\"screen-reader-text\"> &#8220;How to Choose API 5DP \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u062f\u0631\u062c\u0629s for Deep and Directional 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