{"id":15670,"date":"2026-06-16T11:43:11","date_gmt":"2026-06-16T03:43:11","guid":{"rendered":"https:\/\/www.drillpipes.com\/g105-vs-s135-%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\/"},"modified":"2026-09-18T16:00:32","modified_gmt":"2026-09-18T08:00:32","slug":"g105-vs-s135-%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","status":"publish","type":"post","link":"https:\/\/www.drillpipes.com\/ru\/g105-vs-s135-%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\/","title":{"rendered":"G105 vs S135 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">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 are high-strength <strong>API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430<\/strong> \u043a\u043b\u0430\u0441\u0441s used in \u0440\u043e\u0442\u043e\u0440 \u0431\u0443\u0440\u0435\u043d\u0438\u0435 \u043a\u043e\u043b\u043e\u043d\u043d\u0430s to carry axial load, transmit \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442, circulate \u0431\u0443\u0440\u043e\u0432\u043e\u0439 \u0440\u0430\u0441\u0442\u0432\u043e\u0440 and connect the \u0431\u0443\u0440\u043e\u0432\u0430\u044f \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0430 to the bottom-\u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 assembly. Both are normally manufactured from heat-treated seamless alloy steel \u0442\u0440\u0443\u0431\u0430 bodies with upset ends, then \u0442\u0440\u0435\u043d\u0438\u0435-welded to alloy steel \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s with \u0440\u043e\u0442\u043e\u0440 shouldered \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435s. G105 has a 105 ksi minimum \u043f\u0440\u0435\u0434\u0435\u043b \u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438, while S135 has a 135 ksi minimum \u043f\u0440\u0435\u0434\u0435\u043b \u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438.<\/p>\n\n<p class=\"wp-block-paragraph\">The difference between G105 and S135 is not only a strength number. S135 provides higher tensile and \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 margin, but the final selection should also consider \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 depth, \u043a\u0440\u044e\u043a load, dogleg severity, \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c exposure, \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 capacity, sour-service risk, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 condition and inspection documents. For controlled medium-to-\u0433\u043b\u0443\u0431\u043e\u043a\u0430\u044f \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s, G105 may be enough; for deeper, longer or higher-\u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 \u0431\u0443\u0440\u0435\u043d\u0438\u0435 sections, S135 may be required.<\/p>\n\n<h2 class=\"wp-block-heading\"><strong>Quick Answer: When to Choose G105 or S135 Drill Pipe<\/strong><strong><\/strong><\/h2>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Selection Question<\/strong><strong><\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>G105 Drill Pipe<\/strong><strong><\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>S135 Drill Pipe<\/strong><strong><\/strong><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Strength level<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">105 ksi minimum \u043f\u0440\u0435\u0434\u0435\u043b \u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438<\/td><td class=\"has-text-align-center\" data-align=\"center\">135 ksi minimum \u043f\u0440\u0435\u0434\u0435\u043b \u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Best fit<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">Medium-to-\u0433\u043b\u0443\u0431\u043e\u043a\u0430\u044f \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s, directional \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s, controlled high-load sections<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u0433\u043b\u0443\u0431\u043e\u043a\u0430\u044f \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s, high-\u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 \u0431\u0443\u0440\u0435\u043d\u0438\u0435, extended-reach and complex \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 profiles<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Main advantage<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">Balanced strength, availability and cost control<\/td><td class=\"has-text-align-center\" data-align=\"center\">Higher tensile capacity and stronger load margin<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Main caution<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">Still needs \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 review<\/td><td class=\"has-text-align-center\" data-align=\"center\">Higher strength does not remove \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c, H\u2082S or \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 risk<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Typical review point<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">Whether X95 is not enough but S135 is not necessary<\/td><td class=\"has-text-align-center\" data-align=\"center\">Whether G105 leaves insufficient load or \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 margin<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Inspection focus<\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\">MTC, dimensional report, NDT, \u0440\u0435\u0437\u044c\u0431\u0430 gauge record, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 check<\/td><td class=\"has-text-align-center\" data-align=\"center\">MTC, i\u041c\u041f\u0430ct\/hardness review, NDT, \u0440\u0435\u0437\u044c\u0431\u0430 inspection, weld-zone and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 control<\/td><\/tr><\/tbody><\/table><\/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\/g105-vs-s135-drill-pipe-selection-maps.pdf\" type=\"application\/pdf\" style=\"width:100%;height:600px\" aria-label=\"\u0412\u0441\u0442\u0430\u0432\u043a\u0430 g105-vs-s135-drill-pipe-selection-maps\"><\/object><a id=\"wp-block-file--media-37426765-1b6d-4c65-8ef6-a9d6b9b3f34e\" href=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/g105-vs-s135-drill-pipe-selection-maps.pdf\">G105-vs-S135-\u0431\u0443\u0440-\u0442\u0440\u0443\u0431\u0430-selection-maps<\/a><a href=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/g105-vs-s135-drill-pipe-selection-maps.pdf\" class=\"wp-block-file__button wp-element-button\" download=\"\" aria-describedby=\"wp-block-file--media-37426765-1b6d-4c65-8ef6-a9d6b9b3f34e\">Download<\/a><\/div>\n\n<p class=\"wp-block-paragraph\">If the \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 has moderate depth, controlled dogleg severity and no extreme \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 demand, G105 may be enough. If the \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 has high suspended \u043a\u043e\u043b\u043e\u043d\u043d\u0430 \u0432\u0435\u0441, high overpull risk, long \u0433\u043e\u0440\u0438\u0437\u043e\u043d\u0442\u0430\u043b\u044c\u043d\u044b\u0439 displacement or severe \u0440\u043e\u0442\u043e\u0440 \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442, S135 should be reviewed.<\/p>\n\n<h2 class=\"wp-block-heading\"><strong>API 5DP Strength Difference Between G105 and S135<\/strong><strong><\/strong><\/h2>\n\n<p class=\"wp-block-paragraph\">In API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043a\u043b\u0430\u0441\u0441s, the number in <strong>G105<\/strong>\u00a0and <strong>S135<\/strong>\u00a0refers to the specified minimum \u043f\u0440\u0435\u0434\u0435\u043b \u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438 in thousands of psi. G105 means a 105 ksi minimum \u043f\u0440\u0435\u0434\u0435\u043b \u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438 \u043a\u043b\u0430\u0441\u0441, while S135 means a 135 ksi minimum \u043f\u0440\u0435\u0434\u0435\u043b \u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438 \u043a\u043b\u0430\u0441\u0441.<\/p>\n\n<figure class=\"wp-block-table aligncenter\"><table class=\"has-fixed-layout\"><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Grade<\/strong><strong><\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Minimum Yield Strength<\/strong><strong><\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Maximum Yield Strength<\/strong><strong><\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Minimum Tensile Strength<\/strong><strong><\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Practical Meaning<\/strong><strong><\/strong><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">G105<\/td><td class=\"has-text-align-center\" data-align=\"center\">105,000 psi \/ 724 \u041c\u041f\u0430<\/td><td class=\"has-text-align-center\" data-align=\"center\">135,000 psi \/ 931 \u041c\u041f\u0430<\/td><td class=\"has-text-align-center\" data-align=\"center\">115,000 psi \/ 793 \u041c\u041f\u0430<\/td><td class=\"has-text-align-center\" data-align=\"center\">Higher-load \u0431\u0443\u0440\u0435\u043d\u0438\u0435 where X95 may not provide enough margin<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">S135<\/td><td class=\"has-text-align-center\" data-align=\"center\">135,000 psi \/ 931 \u041c\u041f\u0430<\/td><td class=\"has-text-align-center\" data-align=\"center\">165,000 psi \/ 1138 \u041c\u041f\u0430<\/td><td class=\"has-text-align-center\" data-align=\"center\">145,000 psi \/ 1000 \u041c\u041f\u0430<\/td><td class=\"has-text-align-center\" data-align=\"center\">Deep, high-tension, high-\u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 and extended-reach \u0431\u0443\u0440\u0435\u043d\u0438\u0435<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"561\" src=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/G105-vs-S135-Drill-Pipe-Strength-Comparison-1024x561.jpg\" alt=\"\" class=\"wp-image-13523\" style=\"aspect-ratio:1.8253349302286717;width:1073px;height:auto\" srcset=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/G105-vs-S135-Drill-Pipe-Strength-Comparison-1024x561.jpg 1024w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/G105-vs-S135-Drill-Pipe-Strength-Comparison-300x164.jpg 300w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/G105-vs-S135-Drill-Pipe-Strength-Comparison.jpg 1694w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n<p class=\"wp-block-paragraph\">This strength gap is important, but it is only the first layer of selection. A \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043a\u043e\u043b\u043e\u043d\u043d\u0430 is not loaded by static tension alone. During \u0431\u0443\u0440\u0435\u043d\u0438\u0435, the \u0442\u0440\u0443\u0431\u0430 body works under combined tension, \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442, internal pressure, bending stress, vibration, contact \u0438\u0437\u043d\u043e\u0441 and repeated make-up \/ break-out cycles.<\/p>\n\n<p class=\"wp-block-paragraph\">That is why a stronger \u043a\u043b\u0430\u0441\u0441 cannot be treated as a universal up\u043a\u043b\u0430\u0441\u0441. If the \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 is mismatched, the \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 shoulder is worn, the hardbanding is damaged, or the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 lacks traceable inspection records, higher \u043f\u0440\u0435\u0434\u0435\u043b \u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438 will not solve the field acceptance problem.<\/p>\n\n<h2 class=\"wp-block-heading\">G105 and S135 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 Selection by Strength and Service Demand<\/h2>\n\n<p class=\"wp-block-paragraph\">G105 and S135 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 are both high-strength API 5DP \u043a\u043b\u0430\u0441\u0441s, but they are usually selected for different \u0431\u0443\u0440\u0435\u043d\u0438\u0435 demands. G105 is often used when the \u0431\u0443\u0440\u0435\u043d\u0438\u0435 program needs higher strength than <a href=\"__PROTECTED_0__\"><strong>X95<\/strong>,<\/a> while S135 is selected when deeper \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s, longer \u0433\u043e\u0440\u0438\u0437\u043e\u043d\u0442\u0430\u043b\u044c\u043d\u044b\u0439 sections or higher \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 demand require a stronger \u0442\u0440\u0443\u0431\u0430 body. The selection should not be based on \u043a\u043b\u0430\u0441\u0441 name alone. \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 depth, tensile load, \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442, \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c exposure, \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 type, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 dimensions and inspection records should be reviewed together.<\/p>\n\n<h3 class=\"wp-block-heading\">G105 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 for Controlled High-Load \u0431\u0443\u0440\u0435\u043d\u0438\u0435<\/h3>\n\n<p class=\"wp-block-paragraph\"><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\/\"><strong>G105 drill pipe<\/strong><\/a> is commonly selected when the drilling string needs more strength than X95, but the full drilling program does not require S135. It is suitable for medium-to-deep wells, directional sections, build-and-hold intervals and controlled high-load drilling conditions where tensile load, torque and bending fatigue are higher than conventional service.<\/p>\n\n<p class=\"wp-block-paragraph\">The main value of G105 is balance. It provides a useful strength increase while keeping the specification close to common API \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 supply ranges. For many \u0431\u0443\u0440\u0435\u043d\u0438\u0435 programs, this avoids unnecessary \u043a\u043b\u0430\u0441\u0441 escalation when the \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 profile is demanding but still controlled.<\/p>\n\n<div class=\"wp-block-media-text is-stacked-on-mobile\"><figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"767\" src=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/G105-Drill-Pipe-2-1024x767.jpg\" alt=\"\" class=\"wp-image-13532 size-full\" srcset=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/G105-Drill-Pipe-2-1024x767.jpg 1024w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/G105-Drill-Pipe-2-300x225.jpg 300w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/G105-Drill-Pipe-2.jpg 1449w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><div class=\"wp-block-media-text__content\">\n<p class=\"wp-block-paragraph\"><strong>G105 drill pipe is often reviewed for:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>deeper \u0432\u0435\u0440\u0442\u0438\u043a\u0430\u043b\u044c\u043d\u044b\u0439 \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s where X95 leaves limited tensile margin;<\/li>\n\n\n\n<li>directional \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s with combined axial load and bending \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c;<\/li>\n\n\n\n<li>build sections where \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 increase;<\/li>\n\n\n\n<li>\u0431\u0443\u0440\u0435\u043d\u0438\u0435 \u043a\u043e\u043b\u043e\u043d\u043d\u0430s that need higher load capacity without moving directly to S135;<\/li>\n\n\n\n<li>replacement or mixed-\u043a\u043e\u043b\u043e\u043d\u043d\u0430 orders where \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 co\u041c\u041f\u0430tibility is a major control point.<\/li>\n<\/ul>\n<\/div><\/div>\n\n<p class=\"wp-block-paragraph\">The key risk for G105 is not only whether the \u0442\u0440\u0443\u0431\u0430 body meets the \u043a\u043b\u0430\u0441\u0441 requirement. \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c may start at slip marks, \u043a\u043e\u0440\u0440\u043e\u0437\u0438\u044f pits, hardbanding defects, \u0440\u0435\u0437\u044c\u0431\u0430 shoulder damage or the upset transition area. A G105 order should therefore be checked by OD, nominal \u0432\u0435\u0441, \u0442\u043e\u043b\u0449\u0438\u043d\u0430 \u0441\u0442\u0435\u043d\u043a\u0438, range, upset type, \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 OD\/ID, drift dia\u043c\u0435\u0442\u0440, hardbanding condition and inspection class.<\/p>\n\n<h3 class=\"wp-block-heading\">S135 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 for Deep and High-\u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s<\/h3>\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<\/a><\/strong> is the higher-strength option in this comparison. It is normally selected when the drilling program needs more tensile capacity, more torque reserve or a higher safety margin under complex well conditions. Compared with G105, S135 provides a stronger pipe body, but it also requires closer control of toughness, hardness, connection condition and traceability documents.<\/p>\n\n<div class=\"wp-block-media-text is-stacked-on-mobile\"><figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"682\" src=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/S135Drill-pipe-1024x682.jpg\" alt=\"\" class=\"wp-image-13535 size-full\" srcset=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/S135Drill-pipe-1024x682.jpg 1024w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/S135Drill-pipe-300x200.jpg 300w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/S135Drill-pipe.jpg 1537w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure><div class=\"wp-block-media-text__content\">\n<p class=\"wp-block-paragraph\">S135 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 is often reviewed for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>deep and ultra-\u0433\u043b\u0443\u0431\u043e\u043a\u0430\u044f \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s with high suspended \u043a\u043e\u043b\u043e\u043d\u043d\u0430 \u0432\u0435\u0441;<\/li>\n\n\n\n<li>long \u0433\u043e\u0440\u0438\u0437\u043e\u043d\u0442\u0430\u043b\u044c\u043d\u044b\u0439 sections and extended-reach \u0431\u0443\u0440\u0435\u043d\u0438\u0435;<\/li>\n\n\n\n<li>high-\u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 \u0440\u043e\u0442\u043e\u0440 \u0431\u0443\u0440\u0435\u043d\u0438\u0435 and reaming operations;<\/li>\n\n\n\n<li>high overpull risk during tripping or stuck-\u0442\u0440\u0443\u0431\u0430 recovery;<\/li>\n\n\n\n<li>complex directional \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s with severe dogleg or long build sections;<\/li>\n\n\n\n<li>\u0431\u0443\u0440\u0435\u043d\u0438\u0435 programs where G105 does not provide enough load margin.<\/li>\n<\/ul>\n<\/div><\/div>\n\n<p class=\"wp-block-paragraph\">S135 can improve the strength margin of the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430, but it should not be treated as an automatic up\u043a\u043b\u0430\u0441\u0441. Higher-strength \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 still needs careful review of \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c exposure, sour-service risk, \u0442\u0440\u0435\u043d\u0438\u0435 weld quality, \u0440\u0435\u0437\u044c\u0431\u0430 condition, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 performance and make-up \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 control.<\/p>\n\n<figure class=\"wp-block-image aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/G105-vs-S135-Drill-Pipe-Service-Demand-Matrix-1024x576.jpg\" alt=\"\" class=\"wp-image-13524\" style=\"aspect-ratio:1.7778471054202158;width:1174px;height:auto\" srcset=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/G105-vs-S135-Drill-Pipe-Service-Demand-Matrix-1024x576.jpg 1024w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/G105-vs-S135-Drill-Pipe-Service-Demand-Matrix-300x169.jpg 300w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/G105-vs-S135-Drill-Pipe-Service-Demand-Matrix.jpg 1672w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n<p class=\"wp-block-paragraph\">For S135 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430, the full specification should include \u0442\u0440\u0443\u0431\u0430 size, nominal \u0432\u0435\u0441, \u0442\u043e\u043b\u0449\u0438\u043d\u0430 \u0441\u0442\u0435\u043d\u043a\u0438, range, upset type, \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 OD\/ID, drift requirement, internal coating, hardbanding, make-up \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442, inspection \u0441\u0432\u0435\u0447\u0430ard and document package. The \u043a\u043b\u0430\u0441\u0441 name is only one part of the technical description. Field acceptance depends on whether the complete \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 matches the \u0431\u0443\u0440\u0435\u043d\u0438\u0435 program and the required inspection records.<\/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\/g105-s135-drill-pipe-service-demand-review-5-pages.pdf\" type=\"application\/pdf\" style=\"width:100%;height:600px\" aria-label=\"\u0412\u0441\u0442\u0430\u0432\u043a\u0430 g105-s135-drill-pipe-service-demand-review\"><\/object><a id=\"wp-block-file--media-5b207ea2-23c4-408c-8f66-269118e78731\" href=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/g105-s135-drill-pipe-service-demand-review-5-pages.pdf\">G105-S135-\u0431\u0443\u0440-\u0442\u0440\u0443\u0431\u0430-service-demand-review<\/a><a href=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/g105-s135-drill-pipe-service-demand-review-5-pages.pdf\" class=\"wp-block-file__button wp-element-button\" download=\"\" aria-describedby=\"wp-block-file--media-5b207ea2-23c4-408c-8f66-269118e78731\">Download<\/a><\/div>\n\n<h2 class=\"wp-block-heading\"><strong>\u00a0<\/strong>Load, Torque and Fatigue Factors in G105 and S135 Drill Pipe Selection<\/h2>\n\n<p class=\"wp-block-paragraph\">G105 and S135 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 should be co\u041c\u041f\u0430red under real \u0431\u0443\u0440\u0435\u043d\u0438\u0435 loads, not only by \u043f\u0440\u0435\u0434\u0435\u043b \u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438. In the \u0431\u0443\u0440\u043e\u0432\u0430\u044f \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0430, the \u0442\u0440\u0443\u0431\u0430 body and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 may work under axial tension, \u0440\u043e\u0442\u043e\u0440 \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442, internal pressure, bending, vibration, contact \u0438\u0437\u043d\u043e\u0441 and repeated make-up \/ break-out cycles. These loads often act together in directional, \u0433\u043e\u0440\u0438\u0437\u043e\u043d\u0442\u0430\u043b\u044c\u043d\u044b\u0439 and extended-reach \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s.<\/p>\n\n<figure class=\"wp-block-image aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/ECHNICAL-DRILL-PIPE-FIELD-LOAD-AND-FATIGUE-MAP-G105-S135-GRADES-1024x576.jpg\" alt=\"\" class=\"wp-image-13522\" srcset=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/ECHNICAL-DRILL-PIPE-FIELD-LOAD-AND-FATIGUE-MAP-G105-S135-GRADES-1024x576.jpg 1024w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/ECHNICAL-DRILL-PIPE-FIELD-LOAD-AND-FATIGUE-MAP-G105-S135-GRADES-300x169.jpg 300w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/ECHNICAL-DRILL-PIPE-FIELD-LOAD-AND-FATIGUE-MAP-G105-S135-GRADES.jpg 1672w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th class=\"has-text-align-center\" data-align=\"center\">\u0431\u0443\u0440\u0435\u043d\u0438\u0435 Condition<\/th><th class=\"has-text-align-center\" data-align=\"center\">Main Load Concern<\/th><th class=\"has-text-align-center\" data-align=\"center\">G105 Review Point<\/th><th class=\"has-text-align-center\" data-align=\"center\">S135 Review Point<\/th><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Deeper \u0432\u0435\u0440\u0442\u0438\u043a\u0430\u043b\u044c\u043d\u044b\u0439 \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s<\/td><td class=\"has-text-align-center\" data-align=\"center\">Suspended \u043a\u043e\u043b\u043e\u043d\u043d\u0430 \u0432\u0435\u0441 and overpull margin<\/td><td class=\"has-text-align-center\" data-align=\"center\">Suitable when the load is higher than X95 can comfortably handle but still controlled<\/td><td class=\"has-text-align-center\" data-align=\"center\">Reviewed when \u043a\u043e\u043b\u043e\u043d\u043d\u0430 \u0432\u0435\u0441, overpull risk or safety margin requires a stronger \u0442\u0440\u0443\u0431\u0430 body<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Directional and \u0433\u043e\u0440\u0438\u0437\u043e\u043d\u0442\u0430\u043b\u044c\u043d\u044b\u0439 \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s<\/td><td class=\"has-text-align-center\" data-align=\"center\">\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 \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c<\/td><td class=\"has-text-align-center\" data-align=\"center\">Check dogleg severity, \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 capacity, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 condition and \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c-sensitive areas<\/td><td class=\"has-text-align-center\" data-align=\"center\">Consider when \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 repeated bending exceed the comfortable margin of G105<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Extended-reach \u0431\u0443\u0440\u0435\u043d\u0438\u0435<\/td><td class=\"has-text-align-center\" data-align=\"center\">High \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 and long lateral displacement<\/td><td class=\"has-text-align-center\" data-align=\"center\">May be limited when \u0433\u043e\u0440\u0438\u0437\u043e\u043d\u0442\u0430\u043b\u044c\u043d\u044b\u0439 displacement and \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 increase<\/td><td class=\"has-text-align-center\" data-align=\"center\">Often reviewed for higher tensile and \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 reserve, but still depends on \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 control<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Replacement or mixed-\u043a\u043e\u043b\u043e\u043d\u043d\u0430 orders<\/td><td class=\"has-text-align-center\" data-align=\"center\">Co\u041c\u041f\u0430tibility with the existing \u043a\u043e\u043b\u043e\u043d\u043d\u0430<\/td><td class=\"has-text-align-center\" data-align=\"center\">Must match OD, \u0432\u0435\u0441, range, \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 OD\/ID and drift<\/td><td class=\"has-text-align-center\" data-align=\"center\">Must also match make-up \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442, shoulder condition, hardbanding and inspection class<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">\u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c-sensitive areas should be reviewed carefully. Slip marks, hardbanding edges, \u043a\u043e\u0440\u0440\u043e\u0437\u0438\u044f pits, upset transitions, \u0442\u0440\u0435\u043d\u0438\u0435 weld zones and \u0440\u0435\u0437\u044c\u0431\u0430 shoulders can become initiation points under repeated bending or vibration.<\/p>\n\n<p class=\"wp-block-paragraph\">A \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430-specified G105 \u043a\u043e\u043b\u043e\u043d\u043d\u0430 may perform better than a poorly matched S135 \u043a\u043e\u043b\u043e\u043d\u043d\u0430 if the \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435, inspection class and \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c exposure are properly controlled. A \u0442\u0440\u0443\u0431\u0430 that is correct by \u043a\u043b\u0430\u0441\u0441 but wrong by \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 dimension may still fail field matching.<\/p>\n\n<h2 class=\"wp-block-heading\"><strong>Sour Service and H\u2082S Risk in G105 and S135 Drill Pipe<\/strong><\/h2>\n\n<p class=\"wp-block-paragraph\">H\u2082S exposure changes the selection logic. In sour or H\u2082S-containing \u0431\u0443\u0440\u0435\u043d\u0438\u0435 conditions, higher-strength steels can become more sensitive to sulfide stress cracking and hydrogen embrittlement. This does not mean G105 or S135 can never be used in such environments. It means the \u043a\u043b\u0430\u0441\u0441 cannot be selected by strength alone.<\/p>\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"562\" src=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/H2S-Sour-Service-Risk-Review-for-G105-and-S135-Drill-Pipe-1024x562.jpg\" alt=\"\" class=\"wp-image-13528\" srcset=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/H2S-Sour-Service-Risk-Review-for-G105-and-S135-Drill-Pipe-1024x562.jpg 1024w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/H2S-Sour-Service-Risk-Review-for-G105-and-S135-Drill-Pipe-300x165.jpg 300w, https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/H2S-Sour-Service-Risk-Review-for-G105-and-S135-Drill-Pipe.jpg 1693w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n<p class=\"wp-block-paragraph\">For G105 and S135 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430, sour-service review should consider:<\/p>\n\n<ul class=\"wp-block-list\">\n<li>H\u2082S partial pressure and exposure condition;<\/li>\n\n\n\n<li>CO\u2082, chloride, temperature and \u0431\u0443\u0440\u043e\u0432\u043e\u0439 \u0440\u0430\u0441\u0442\u0432\u043e\u0440 chemistry;<\/li>\n\n\n\n<li>hardness control of \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 weld zone;<\/li>\n\n\n\n<li>surface condition, \u043a\u043e\u0440\u0440\u043e\u0437\u0438\u044f pits and mechanical damage;<\/li>\n\n\n\n<li>NACE \/ ISO sour-service requirement, when applicable;<\/li>\n\n\n\n<li>PMI, MTC, hardness records and third-party inspection;<\/li>\n\n\n\n<li>whether a sour-service or <a href=\"__PROTECTED_0__\"><strong>special material \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430<\/strong><\/a> route is required.<\/li>\n<\/ul>\n\n<p class=\"wp-block-paragraph\">S135 has higher strength than G105, but in H\u2082S conditions that higher strength can also require stricter crack-resistance review. For this reason, S135 should not be treated as an automatic solution for sour \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s. If the project specification includes H\u2082S, CO\u2082, chloride or high temperature, the material route, hardness limit, inspection class and document package should be confirmed before order release.<\/p>\n\n<h2 class=\"wp-block-heading\"><strong>Connection and Tool Joint Control<\/strong><\/h2>\n\n<p class=\"wp-block-paragraph\">G105 and S135 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 are not only \u0442\u0440\u0443\u0431\u0430 bodies. A complete \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 includes the seamless \u0442\u0440\u0443\u0431\u0430 body, upset transition, \u0442\u0440\u0435\u043d\u0438\u0435 weld zone, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435, pin \/ box \u0440\u0435\u0437\u044c\u0431\u0430, shoulder, drift path and sometimes internal coating or hardbanding.<\/p>\n\n<p class=\"wp-block-paragraph\">\u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 control is often where field problems appear.<\/p>\n\n<p class=\"wp-block-paragraph\">Common \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435-related checks include:<\/p>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\"><strong>Check Item<\/strong><strong><\/strong><\/td><td class=\"has-text-align-center\" data-align=\"center\"><strong>Why It Matters<\/strong><strong><\/strong><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 type<\/td><td class=\"has-text-align-center\" data-align=\"center\">NC, IF, FH, REG or premium \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 must match the existing \u043a\u043e\u043b\u043e\u043d\u043d\u0430<\/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<\/td><td class=\"has-text-align-center\" data-align=\"center\">Affects \u0438\u0437\u043d\u043e\u0441, handling and co\u041c\u041f\u0430tibility with \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 design<\/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 ID<\/td><td class=\"has-text-align-center\" data-align=\"center\">Controls hydraulic clearance and drift path<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Make-up \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442<\/td><td class=\"has-text-align-center\" data-align=\"center\">Must match \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 design and \u0431\u0443\u0440\u043e\u0432\u0430\u044f \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0430 practice<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0440\u0435\u0437\u044c\u0431\u0430 gauge record<\/td><td class=\"has-text-align-center\" data-align=\"center\">Confirms \u0440\u0435\u0437\u044c\u0431\u0430 form, shoulder condition and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 acceptance<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Shoulder condition<\/td><td class=\"has-text-align-center\" data-align=\"center\">Controls \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 transfer and sealing contact<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Hardbanding<\/td><td class=\"has-text-align-center\" data-align=\"center\">Affects \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 \u0438\u0437\u043d\u043e\u0441 and \u043e\u0431\u0441\u0430\u0434\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430-friendly performance<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0440\u0435\u0437\u044c\u0431\u0430 protector<\/td><td class=\"has-text-align-center\" data-align=\"center\">Prevents handling damage before field use<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">A common market example is 5\u2033 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 with NC50 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435. But \u201c5\u2033 G105 NC50\u201d or <a href=\"__PROTECTED_0__\">\u201c5\u2033 S135 NC50\u201d <\/a>is still not a complete order description. \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 OD, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 ID, upset type, range, drift dia\u043c\u0435\u0442\u0440, hardbanding and inspection documents must also be confirmed.<\/p>\n\n<p class=\"wp-block-paragraph\">When \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 geometry, shoulder contact or make-up \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 becomes the controlling factor,<strong><a href=\"__PROTECTED_0__\"> special \u0440\u0435\u0437\u044c\u0431\u0430ed \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 <\/a><\/strong>can be reviewed to match the existing \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 and \u0431\u0443\u0440\u043e\u0432\u0430\u044f \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0430-side \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 requirements.<\/p>\n\n<p class=\"wp-block-paragraph\">If the \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 is not suitable, the \u0442\u0440\u0443\u0431\u0430 may meet API 5DP mechanical requirements but still fail during \u0431\u0443\u0440\u043e\u0432\u0430\u044f \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0430-site matching or make-up \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 control. \u043a\u043b\u0430\u0441\u0441 strength cannot compensate for wrong \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 geometry.<\/p>\n\n<h2 class=\"wp-block-heading\">Inspection and Document Review for G105 and S135 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430<\/h2>\n\n<p class=\"wp-block-paragraph\">Inspection is the step that turns a \u043a\u043b\u0430\u0441\u0441 name into verifiable \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430. For G105 and S135, the review should cover the \u0442\u0440\u0443\u0431\u0430 body, upset area, \u0442\u0440\u0435\u043d\u0438\u0435 weld zone, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435, \u0440\u0435\u0437\u044c\u0431\u0430 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435, drift path, marking and final document package. The purpose is not only to prove the \u043f\u0440\u0435\u0434\u0435\u043b \u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438, but also to show that each \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 can be matched, made up, inspected and traced before shipment release.<\/p>\n\n<h3 class=\"wp-block-heading\">Main Inspection Items Before Shipment<\/h3>\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><th>Inspection Item<\/th><th>How It Is Usually Performed<\/th><th>What It Verifies<\/th><\/tr><tr><td><strong>Visual and marking inspection<\/strong><\/td><td>Each \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 is checked for \u0442\u0440\u0443\u0431\u0430 number, size, \u043a\u043b\u0430\u0441\u0441, range, \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435, heat number, stencil marking, color band and \u0440\u0435\u0437\u044c\u0431\u0430 protector condition.<\/td><td>Confirms that the physical \u0442\u0440\u0443\u0431\u0430 matches the order, MTC and packing list.<\/td><\/tr><tr><td><strong>Dimensional inspection<\/strong><\/td><td>OD, \u0442\u043e\u043b\u0449\u0438\u043d\u0430 \u0441\u0442\u0435\u043d\u043a\u0438, length, straightness, upset dimensions, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 OD\/ID and shoulder dimensions are measured with calibrated tools.<\/td><td>Confirms fit-up, \u043a\u043e\u043b\u043e\u043d\u043d\u0430 co\u041c\u041f\u0430tibility, drift clearance and compliance with the ordered specification.<\/td><\/tr><tr><td><strong>Pipe body NDT<\/strong><\/td><td>Ultrasonic testing, electromagnetic inspection or other project-specified NDT methods are applied to detect internal or surface defects.<\/td><td>Screens the \u0442\u0440\u0443\u0431\u0430 body for cracks, laminations, wall-loss areas or unacceptable discontinuities.<\/td><\/tr><tr><td><strong>Friction weld zone inspection<\/strong><\/td><td>The weld area between \u0442\u0440\u0443\u0431\u0430 body and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 is visually checked and normally reviewed by NDT according to the ITP.<\/td><td>Controls one of the most critical transition areas under \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442, bending and tensile load.<\/td><\/tr><tr><td><strong>Tool joint inspection<\/strong><\/td><td>\u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 OD, ID, shoulder face, hardbanding area and pin \/ box condition are checked before release.<\/td><td>Ensures \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 transfer, \u0438\u0437\u043d\u043e\u0441 resistance, \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 matching and handling reliability.<\/td><\/tr><tr><td><strong>Thread gauge inspection<\/strong><\/td><td>Pin and box \u0440\u0435\u0437\u044c\u0431\u0430s are checked by proper \u0440\u0435\u0437\u044c\u0431\u0430 gauges. Shoulder condition, \u0440\u0435\u0437\u044c\u0431\u0430 form, \u043c\u0435\u0442\u0447\u0438\u043aer and visible damage are reviewed.<\/td><td>Confirms that the \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 can be made up correctly at the \u0431\u0443\u0440\u043e\u0432\u0430\u044f \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0430 site.<\/td><\/tr><tr><td><strong>Drift test<\/strong><\/td><td>A specified drift mandrel is passed through the \u0442\u0440\u0443\u0431\u0430 bore and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 ID.<\/td><td>Verifies internal clearance for \u0431\u0443\u0440\u043e\u0432\u043e\u0439 \u0440\u0430\u0441\u0442\u0432\u043e\u0440 flow and down\u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 tool passage.<\/td><\/tr><tr><td><strong>Hardness test<\/strong><\/td><td>Hardness readings are taken on the \u0442\u0440\u0443\u0431\u0430 body, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 or weld zone when required by \u043a\u043b\u0430\u0441\u0441, sour-service review or project ITP.<\/td><td>Helps control high-strength material condition and cracking sensitivity, especially for S135 or sour-service programs.<\/td><\/tr><tr><td><strong>Impact test<\/strong><\/td><td>Charpy V-notch specimens are machined from the required material location, cooled to the specified temperature and broken by pendulum i\u041c\u041f\u0430ct testing.<\/td><td>Measures absorbed energy and supports toughness review for low-temperature, offshore or project-specified service.<\/td><\/tr><tr><td><strong>Hydrostatic or pressure-related test<\/strong><\/td><td>When specified by the order or ITP, pressure testing is performed under controlled pressure and holding time.<\/td><td>Verifies pressure integrity, sealing performance and absence of leakage under the required test condition.<\/td><\/tr><tr><td><strong>Document review<\/strong><\/td><td>MTC, heat records, test reports, NDT records, dimensional reports, \u0440\u0435\u0437\u044c\u0431\u0430 gauge records and packing list are co\u041c\u041f\u0430red against \u0442\u0440\u0443\u0431\u0430 marking.<\/td><td>Confirms traceability from material heat to final shipped \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<h3 class=\"wp-block-heading\">How the Key Tests Are Reviewed<\/h3>\n\n<p class=\"wp-block-paragraph\"><strong>Mechanical test review<\/strong><br\/>Mechanical testing verifies whether the pipe body meets the required API 5DP grade. The report should show actual yield strength, tensile strength and elongation values, with heat number and specimen reference, not only a general \u201cpassed\u201d result.<\/p>\n\n<p class=\"wp-block-paragraph\"><strong>Impact test review<\/strong><br\/>Impact testing is required when toughness or low-temperature performance needs verification. Charpy V-notch specimens are tested at the specified temperature, and the absorbed energy value is recorded to assess resistance to brittle fracture under dynamic loading.<\/p>\n\n<p class=\"wp-block-paragraph\"><strong>Hardness review<\/strong><br\/>Hardness testing helps control cracking sensitivity in high-strength drill pipe, especially around the tool joint, friction weld zone and sour-service exposure. Results may be recorded by HB, HRC or HV method according to the project requirement.<\/p>\n\n<p class=\"wp-block-paragraph\"><strong>NDT review<\/strong><br\/>NDT is used to detect defects that visual inspection cannot confirm. The pipe body, upset area, weld zone, tool joint or thread area may be checked by ultrasonic, electromagnetic, magnetic particle or other project-specified methods according to the ITP.<\/p>\n\n<p class=\"wp-block-paragraph\"><strong>Thread and connection review<\/strong><br\/>Thread gauge inspection confirms the pin \/ box connection, shoulder condition and make-up compatibility. Even when the pipe body meets G105 or S135 strength requirements, incorrect thread geometry or shoulder damage can still cause rig-site matching problems.<\/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\/G105_vs_S135_Drill_Pipe_Inspection_Document_Review-1.pdf\" type=\"application\/pdf\" style=\"width:100%;height:600px\" aria-label=\"\u0412\u0441\u0442\u0430\u0432\u043a\u0430 G105_vs_S135_Drill_Pipe_Inspection_Document_Review\"><\/object><a id=\"wp-block-file--media-d52aeea1-5f2d-414c-bb9d-507ba286c516\" href=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/G105_vs_S135_Drill_Pipe_Inspection_Document_Review-1.pdf\">G105_vs_S135_\u0431\u0443\u0440_\u0442\u0440\u0443\u0431\u0430_Inspection_Document_Review<\/a><a href=\"https:\/\/www.drillpipes.com\/wp-content\/uploads\/2026\/06\/G105_vs_S135_Drill_Pipe_Inspection_Document_Review-1.pdf\" class=\"wp-block-file__button wp-element-button\" download=\"\" aria-describedby=\"wp-block-file--media-d52aeea1-5f2d-414c-bb9d-507ba286c516\">Download<\/a><\/div>\n\n<p class=\"wp-block-paragraph\">For S135, hardness and weld-zone control deserve closer attention because the \u043a\u043b\u0430\u0441\u0441 is higher strength. For G105, \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c, \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 co\u041c\u041f\u0430tibility and mixed-\u043a\u043e\u043b\u043e\u043d\u043d\u0430 traceability are often the practical control points.<\/p>\n\n<h2 class=\"wp-block-heading\">Selection Risks When Co\u041c\u041f\u0430ring G105 and S135 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430<\/h2>\n\n<h3 class=\"wp-block-heading\">Strength \u043a\u043b\u0430\u0441\u0441 Is Only One Part of the Selection<\/h3>\n\n<p class=\"wp-block-paragraph\">S135 provides higher \u043f\u0440\u0435\u0434\u0435\u043b \u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438 than G105, but higher strength does not automatically make the \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u043a\u043e\u043b\u043e\u043d\u043d\u0430 safer. \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c exposure, \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 damage, \u0440\u0435\u0437\u044c\u0431\u0430 shoulder \u0438\u0437\u043d\u043e\u0441, weld-zone quality and H\u2082S sensitivity may still become the controlling service risks.<\/p>\n\n<h3 class=\"wp-block-heading\">G105 Is Still a High-Strength API 5DP \u043a\u043b\u0430\u0441\u0441<\/h3>\n\n<p class=\"wp-block-paragraph\">G105 should not be treated as a low-\u043a\u043b\u0430\u0441\u0441 option. It is a high-strength API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043a\u043b\u0430\u0441\u0441 that can be suitable for medium-to-\u0433\u043b\u0443\u0431\u043e\u043a\u0430\u044f \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s, \u043d\u0430\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u043d\u043e\u0435 \u0431\u0443\u0440\u0435\u043d\u0438\u0435 and controlled high-load sections when \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 exposure remain within the accepted range.<\/p>\n\n<h3 class=\"wp-block-heading\">\u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 and \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 Details Control Field Matching<\/h3>\n\n<p class=\"wp-block-paragraph\">A \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 specification should not stop at \u043a\u043b\u0430\u0441\u0441 and OD. \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 type, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 OD\/ID, shoulder condition, make-up \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 and \u0440\u0435\u0437\u044c\u0431\u0430 gauge records directly affect \u0431\u0443\u0440\u043e\u0432\u0430\u044f \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0430-site matching, \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 transfer and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 acceptance.<\/p>\n\n<h3 class=\"wp-block-heading\">Sour-Service Conditions Need Separate Review<\/h3>\n\n<p class=\"wp-block-paragraph\">H\u2082S exposure requires material, hardness and environmental review. A higher-strength \u0442\u0440\u0443\u0431\u0430 body does not automatically improve sour-service performance, especially when sulfide stress cracking or hydrogen embrittlement risk is part of the project specification.<\/p>\n\n<h3 class=\"wp-block-heading\">Document Traceability Supports Final Acceptance<\/h3>\n\n<p class=\"wp-block-paragraph\">The MTC, heat number, inspection report and packing list should match the \u0442\u0440\u0443\u0431\u0430 marking. When the document chain is incomplete, receiving inspection becomes difficult and field acceptance risk increases.<\/p>\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n<p class=\"wp-block-paragraph\">G105 and S135 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 are both high-strength API 5DP \u043a\u043b\u0430\u0441\u0441s, but they are not selected by strength number alone. G105 is often the balanced choice for medium-to-\u0433\u043b\u0443\u0431\u043e\u043a\u0430\u044f \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s and controlled \u043d\u0430\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u043d\u043e\u0435 \u0431\u0443\u0440\u0435\u043d\u0438\u0435 where X95 is not enough but S135 may be unnecessary. S135 is selected when deeper, longer, higher-\u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 or more complex \u0431\u0443\u0440\u0435\u043d\u0438\u0435 profiles require a stronger \u0442\u0440\u0443\u0431\u0430 body and higher load margin.<\/p>\n\n<h2 class=\"wp-block-heading\"><strong>FAQ<\/strong><strong><\/strong><\/h2>\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Is S135 drill pipe always better than G105?<\/strong><\/summary>\n<p class=\"wp-block-paragraph\">No. S135 has higher \u043f\u0440\u0435\u0434\u0435\u043b \u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438, but it is not automatically better for every \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430. G105 may be suitable when load, \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442, dogleg severity and \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c exposure remain within a controlled range<\/p>\n<\/details>\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>What is the main difference between G105 and S135 drill pipe?<\/strong><\/summary>\n<p class=\"wp-block-paragraph\">The main difference is strength level. G105 has 105 ksi minimum \u043f\u0440\u0435\u0434\u0435\u043b \u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438, while S135 has 135 ksi minimum \u043f\u0440\u0435\u0434\u0435\u043b \u0442\u0435\u043a\u0443\u0447\u0435\u0441\u0442\u0438. Final selection should also include \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435, \u0437\u0430\u043c\u043a\u043e\u0432\u043e\u0435 \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435, \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c, sour-service condition and inspection documents.<\/p>\n<\/details>\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>Can G105 drill pipe be used in directional wells?<\/strong><\/summary>\n<p class=\"wp-block-paragraph\">Yes, G105 is commonly reviewed for directional \u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430s where higher load margin than X95 is required. Dogleg severity, \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, \u0443\u0441\u0442\u0430\u043b\u043e\u0441\u0442\u044c exposure and \u0441\u043e\u0435\u0434\u0438\u043d\u0435\u043d\u0438\u0435 capacity should be checked before selection.<\/p>\n<\/details>\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong><strong> S135 drill pipe be used in sour service?<\/strong>?<\/strong><\/summary>\n<p class=\"wp-block-paragraph\">S135 should not be selected for sour service by \u043a\u043b\u0430\u0441\u0441 name alone. H\u2082S exposure requires review of material condition, hardness, environment, NACE \/ ISO requirement, inspection scope and project-specific approval.<\/p>\n<\/details>\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary><strong>What documents should be supplied with G105 or S135 drill pipe?<\/strong><\/summary>\n<p class=\"wp-block-paragraph\">Common documents include MTC, heat number record, mechanical test record, hardness record, dimensional report, NDT report, \u0440\u0435\u0437\u044c\u0431\u0430 gauge record, drift test record and packing list.<\/p>\n<\/details>\n\n<p class=\"wp-block-paragraph\"><\/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-primary-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<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"410\" 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\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>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 are high-strength API 5DP \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430 \u043a\u043b\u0430\u0441\u0441s used in \u0440\u043e\u0442\u043e\u0440 \u0431\u0443\u0440\u0435\u043d\u0438\u0435 \u043a\u043e\u043b\u043e\u043d\u043d\u0430s to carry axial load, transmit \u043a\u0440\u0443\u0442\u044f\u0449\u0438\u0439 \u043c\u043e\u043c\u0435\u043d\u0442, circulate \u0431\u0443\u0440\u043e\u0432\u043e\u0439 \u0440\u0430\u0441\u0442\u0432\u043e\u0440 and connect the \u0431\u0443\u0440\u043e\u0432\u0430\u044f \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0430 to the bottom-\u0441\u043a\u0432\u0430\u0436\u0438\u043d\u0430 assembly. Both are normally manufactured from heat-treated seamless alloy steel \u0442\u0440\u0443\u0431\u0430 bodies with upset ends, then \u0442\u0440\u0435\u043d\u0438\u0435-welded to &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/www.drillpipes.com\/ru\/g105-vs-s135-%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\/\" class=\"more-link\">\u0427\u0438\u0442\u0430\u0442\u044c \u0434\u0430\u043b\u0435\u0435<span class=\"screen-reader-text\"> &#171;G105 vs S135 \u0431\u0443\u0440\u0438\u043b\u044c\u043d\u0430\u044f \u0442\u0440\u0443\u0431\u0430&#187;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":15677,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","footnotes":""},"categories":[106],"tags":[],"class_list":["post-15670","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-106"],"yoast_head":"<!-- This site is optimized 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