{"id":15661,"date":"2026-06-16T11:43:11","date_gmt":"2026-06-16T03:43:11","guid":{"rendered":"https:\/\/www.drillpipes.com\/g105-vs-s135-%d8%a3%d9%86%d8%a8%d9%88%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1\/"},"modified":"2026-09-18T16:00:15","modified_gmt":"2026-09-18T08:00:15","slug":"g105-vs-s135-%d8%a3%d9%86%d8%a8%d9%88%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1","status":"publish","type":"post","link":"https:\/\/www.drillpipes.com\/ar\/g105-vs-s135-%d8%a3%d9%86%d8%a8%d9%88%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1\/","title":{"rendered":"G105 vs S135 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">G105 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 and S135 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 are high-strength <strong>API 5DP \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631<\/strong> \u0627\u0644\u062f\u0631\u062c\u0629s used in \u0627\u0644\u062f\u0648\u0627\u0631 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0633\u0627\u0642s to carry axial load, transmit \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, circulate \u0633\u0627\u0626\u0644 \u0627\u0644\u062d\u0641\u0631 and connect the \u062d\u0641\u0627\u0631\u0629 \u0627\u0644\u062d\u0641\u0631 to the bottom-\u0627\u0644\u0628\u0626\u0631 assembly. Both are normally manufactured from heat-treated seamless alloy steel \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 bodies with upset ends, then \u0627\u0644\u0627\u062d\u062a\u0643\u0627\u0643-welded to alloy steel \u0627\u0644\u0648\u0635\u0644\u0629s with \u0627\u0644\u062f\u0648\u0627\u0631 shouldered \u0627\u0644\u0648\u0635\u0644\u0629s. G105 has a 105 ksi minimum \u0645\u0642\u0627\u0648\u0645\u0629 \u0627\u0644\u062e\u0636\u0648\u0639, while S135 has a 135 ksi minimum \u0645\u0642\u0627\u0648\u0645\u0629 \u0627\u0644\u062e\u0636\u0648\u0639.<\/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 \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 margin, but the final selection should also consider \u0627\u0644\u0628\u0626\u0631 depth, \u0627\u0644\u062e\u0637\u0627\u0641 load, dogleg severity, \u0627\u0644\u062a\u0639\u0628 exposure, \u0627\u0644\u0648\u0635\u0644\u0629 capacity, sour-service risk, \u0627\u0644\u0648\u0635\u0644\u0629 condition and inspection documents. For controlled medium-to-\u0628\u0626\u0631 \u0639\u0645\u064a\u0642s, G105 may be enough; for deeper, longer or higher-\u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 \u0627\u0644\u062d\u0641\u0631 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 \u0645\u0642\u0627\u0648\u0645\u0629 \u0627\u0644\u062e\u0636\u0648\u0639<\/td><td class=\"has-text-align-center\" data-align=\"center\">135 ksi minimum \u0645\u0642\u0627\u0648\u0645\u0629 \u0627\u0644\u062e\u0636\u0648\u0639<\/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-\u0628\u0626\u0631 \u0639\u0645\u064a\u0642s, directional \u0627\u0644\u0628\u0626\u0631s, controlled high-load sections<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u0628\u0626\u0631 \u0639\u0645\u064a\u0642s, high-\u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 \u0627\u0644\u062d\u0641\u0631, extended-reach and complex \u0627\u0644\u0628\u0626\u0631 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 \u0627\u0644\u062a\u0639\u0628 and \u0627\u0644\u0648\u0635\u0644\u0629 review<\/td><td class=\"has-text-align-center\" data-align=\"center\">Higher strength does not remove \u0627\u0644\u062a\u0639\u0628, H\u2082S or \u0627\u0644\u0648\u0635\u0644\u0629 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 \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 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, \u0627\u0644\u062e\u064a\u0637 gauge record, \u0627\u0644\u0648\u0635\u0644\u0629 check<\/td><td class=\"has-text-align-center\" data-align=\"center\">MTC, iMPact\/hardness review, NDT, \u0627\u0644\u062e\u064a\u0637 inspection, weld-zone and \u0627\u0644\u0648\u0635\u0644\u0629 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=\"\u062a\u0636\u0645\u064a\u0646 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-\u0627\u0644\u062d\u0641\u0631-\u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628-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 \u0627\u0644\u0628\u0626\u0631 has moderate depth, controlled dogleg severity and no extreme \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 demand, G105 may be enough. If the \u0627\u0644\u0628\u0626\u0631 has high suspended \u0627\u0644\u0633\u0627\u0642 \u0627\u0644\u0648\u0632\u0646, high overpull risk, long \u0623\u0641\u0642\u064a displacement or severe \u0627\u0644\u062f\u0648\u0627\u0631 \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, 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 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u062f\u0631\u062c\u0629s, the number in <strong>G105<\/strong>\u00a0and <strong>S135<\/strong>\u00a0refers to the specified minimum \u0645\u0642\u0627\u0648\u0645\u0629 \u0627\u0644\u062e\u0636\u0648\u0639 in thousands of psi. G105 means a 105 ksi minimum \u0645\u0642\u0627\u0648\u0645\u0629 \u0627\u0644\u062e\u0636\u0648\u0639 \u0627\u0644\u062f\u0631\u062c\u0629, while S135 means a 135 ksi minimum \u0645\u0642\u0627\u0648\u0645\u0629 \u0627\u0644\u062e\u0636\u0648\u0639 \u0627\u0644\u062f\u0631\u062c\u0629.<\/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 MPa<\/td><td class=\"has-text-align-center\" data-align=\"center\">135,000 psi \/ 931 MPa<\/td><td class=\"has-text-align-center\" data-align=\"center\">115,000 psi \/ 793 MPa<\/td><td class=\"has-text-align-center\" data-align=\"center\">Higher-load \u0627\u0644\u062d\u0641\u0631 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 MPa<\/td><td class=\"has-text-align-center\" data-align=\"center\">165,000 psi \/ 1138 MPa<\/td><td class=\"has-text-align-center\" data-align=\"center\">145,000 psi \/ 1000 MPa<\/td><td class=\"has-text-align-center\" data-align=\"center\">Deep, high-tension, high-\u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 and extended-reach \u0627\u0644\u062d\u0641\u0631<\/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 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0633\u0627\u0642 is not loaded by static tension alone. During \u0627\u0644\u062d\u0641\u0631, the \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 body works under combined tension, \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, internal pressure, bending stress, vibration, contact \u0627\u0644\u062a\u0622\u0643\u0644 and repeated make-up \/ break-out cycles.<\/p>\n\n<p class=\"wp-block-paragraph\">That is why a stronger \u0627\u0644\u062f\u0631\u062c\u0629 cannot be treated as a universal up\u0627\u0644\u062f\u0631\u062c\u0629. If the \u0627\u0644\u0648\u0635\u0644\u0629 is mismatched, the \u0627\u0644\u0648\u0635\u0644\u0629 shoulder is worn, the hardbanding is damaged, or the \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 lacks traceable inspection records, higher \u0645\u0642\u0627\u0648\u0645\u0629 \u0627\u0644\u062e\u0636\u0648\u0639 will not solve the field acceptance problem.<\/p>\n\n<h2 class=\"wp-block-heading\">G105 and S135 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 Selection by Strength and Service Demand<\/h2>\n\n<p class=\"wp-block-paragraph\">G105 and S135 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 are both high-strength API 5DP \u0627\u0644\u062f\u0631\u062c\u0629s, but they are usually selected for different \u0627\u0644\u062d\u0641\u0631 demands. G105 is often used when the \u0627\u0644\u062d\u0641\u0631 program needs higher strength than <a href=\"__PROTECTED_0__\"><strong>X95<\/strong>,<\/a> while S135 is selected when deeper \u0627\u0644\u0628\u0626\u0631s, longer \u0623\u0641\u0642\u064a sections or higher \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 demand require a stronger \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 body. The selection should not be based on \u0627\u0644\u062f\u0631\u062c\u0629 name alone. \u0627\u0644\u0628\u0626\u0631 depth, tensile load, \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, \u0627\u0644\u062a\u0639\u0628 exposure, \u0627\u0644\u0648\u0635\u0644\u0629 type, \u0627\u0644\u0648\u0635\u0644\u0629 dimensions and inspection records should be reviewed together.<\/p>\n\n<h3 class=\"wp-block-heading\">G105 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 for Controlled High-Load \u0627\u0644\u062d\u0641\u0631<\/h3>\n\n<p class=\"wp-block-paragraph\"><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\/\"><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 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 supply ranges. For many \u0627\u0644\u062d\u0641\u0631 programs, this avoids unnecessary \u0627\u0644\u062f\u0631\u062c\u0629 escalation when the \u0627\u0644\u0628\u0626\u0631 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 \u0631\u0623\u0633\u064a \u0627\u0644\u0628\u0626\u0631s where X95 leaves limited tensile margin;<\/li>\n\n\n\n<li>directional \u0627\u0644\u0628\u0626\u0631s with combined axial load and bending \u0627\u0644\u062a\u0639\u0628;<\/li>\n\n\n\n<li>build sections where \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 and \u0627\u0644\u0633\u062d\u0628 increase;<\/li>\n\n\n\n<li>\u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0633\u0627\u0642s that need higher load capacity without moving directly to S135;<\/li>\n\n\n\n<li>replacement or mixed-\u0627\u0644\u0633\u0627\u0642 orders where \u0627\u0644\u0648\u0635\u0644\u0629 coMPatibility 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 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 body meets the \u0627\u0644\u062f\u0631\u062c\u0629 requirement. \u0627\u0644\u062a\u0639\u0628 may start at slip marks, \u0627\u0644\u062a\u0622\u0643\u0644 pits, hardbanding defects, \u0627\u0644\u062e\u064a\u0637 shoulder damage or the upset transition area. A G105 order should therefore be checked by OD, nominal \u0627\u0644\u0648\u0632\u0646, \u0633\u0645\u0627\u0643\u0629 \u0627\u0644\u062c\u062f\u0627\u0631, range, upset type, \u0627\u0644\u0648\u0635\u0644\u0629, \u0627\u0644\u0648\u0635\u0644\u0629 OD\/ID, drift dia\u0645\u062a\u0631, hardbanding condition and inspection class.<\/p>\n\n<h3 class=\"wp-block-heading\">S135 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 for Deep and High-\u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 \u0627\u0644\u0628\u0626\u0631s<\/h3>\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<\/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 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 is often reviewed for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>deep and ultra-\u0628\u0626\u0631 \u0639\u0645\u064a\u0642s with high suspended \u0627\u0644\u0633\u0627\u0642 \u0627\u0644\u0648\u0632\u0646;<\/li>\n\n\n\n<li>long \u0623\u0641\u0642\u064a sections and extended-reach \u0627\u0644\u062d\u0641\u0631;<\/li>\n\n\n\n<li>high-\u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 \u0627\u0644\u062f\u0648\u0627\u0631 \u0627\u0644\u062d\u0641\u0631 and reaming operations;<\/li>\n\n\n\n<li>high overpull risk during tripping or stuck-\u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 recovery;<\/li>\n\n\n\n<li>complex directional \u0627\u0644\u0628\u0626\u0631s with severe dogleg or long build sections;<\/li>\n\n\n\n<li>\u0627\u0644\u062d\u0641\u0631 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 \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631, but it should not be treated as an automatic up\u0627\u0644\u062f\u0631\u062c\u0629. Higher-strength \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 still needs careful review of \u0627\u0644\u062a\u0639\u0628 exposure, sour-service risk, \u0627\u0644\u0627\u062d\u062a\u0643\u0627\u0643 weld quality, \u0627\u0644\u062e\u064a\u0637 condition, \u0627\u0644\u0648\u0635\u0644\u0629 performance and make-up \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 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 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631, the full specification should include \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 size, nominal \u0627\u0644\u0648\u0632\u0646, \u0633\u0645\u0627\u0643\u0629 \u0627\u0644\u062c\u062f\u0627\u0631, range, upset type, \u0627\u0644\u0648\u0635\u0644\u0629, \u0627\u0644\u0648\u0635\u0644\u0629 OD\/ID, drift requirement, internal coating, hardbanding, make-up \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, inspection \u0627\u0644\u0634\u0639\u0644\u0629ard and document package. The \u0627\u0644\u062f\u0631\u062c\u0629 name is only one part of the technical description. Field acceptance depends on whether the complete \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0648\u0635\u0644\u0629 matches the \u0627\u0644\u062d\u0641\u0631 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=\"\u062a\u0636\u0645\u064a\u0646 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-\u0627\u0644\u062d\u0641\u0631-\u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628-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 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 should be coMPared under real \u0627\u0644\u062d\u0641\u0631 loads, not only by \u0645\u0642\u0627\u0648\u0645\u0629 \u0627\u0644\u062e\u0636\u0648\u0639. In the \u062d\u0641\u0627\u0631\u0629 \u0627\u0644\u062d\u0641\u0631, the \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 body and \u0627\u0644\u0648\u0635\u0644\u0629 may work under axial tension, \u0627\u0644\u062f\u0648\u0627\u0631 \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, internal pressure, bending, vibration, contact \u0627\u0644\u062a\u0622\u0643\u0644 and repeated make-up \/ break-out cycles. These loads often act together in directional, \u0623\u0641\u0642\u064a and extended-reach \u0627\u0644\u0628\u0626\u0631s.<\/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\">\u0627\u0644\u062d\u0641\u0631 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 \u0631\u0623\u0633\u064a \u0627\u0644\u0628\u0626\u0631s<\/td><td class=\"has-text-align-center\" data-align=\"center\">Suspended \u0627\u0644\u0633\u0627\u0642 \u0627\u0644\u0648\u0632\u0646 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 \u0627\u0644\u0633\u0627\u0642 \u0627\u0644\u0648\u0632\u0646, overpull risk or safety margin requires a stronger \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 body<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Directional and \u0623\u0641\u0642\u064a \u0627\u0644\u0628\u0626\u0631s<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, \u0627\u0644\u0633\u062d\u0628 and bending \u0627\u0644\u062a\u0639\u0628<\/td><td class=\"has-text-align-center\" data-align=\"center\">Check dogleg severity, \u0627\u0644\u0648\u0635\u0644\u0629 capacity, \u0627\u0644\u0648\u0635\u0644\u0629 condition and \u0627\u0644\u062a\u0639\u0628-sensitive areas<\/td><td class=\"has-text-align-center\" data-align=\"center\">Consider when \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, \u0627\u0644\u0633\u062d\u0628 and repeated bending exceed the comfortable margin of G105<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Extended-reach \u0627\u0644\u062d\u0641\u0631<\/td><td class=\"has-text-align-center\" data-align=\"center\">High \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 and long lateral displacement<\/td><td class=\"has-text-align-center\" data-align=\"center\">May be limited when \u0623\u0641\u0642\u064a displacement and \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 increase<\/td><td class=\"has-text-align-center\" data-align=\"center\">Often reviewed for higher tensile and \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 reserve, but still depends on \u0627\u0644\u0648\u0635\u0644\u0629 and \u0627\u0644\u0648\u0635\u0644\u0629 control<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Replacement or mixed-\u0627\u0644\u0633\u0627\u0642 orders<\/td><td class=\"has-text-align-center\" data-align=\"center\">CoMPatibility with the existing \u0627\u0644\u0633\u0627\u0642<\/td><td class=\"has-text-align-center\" data-align=\"center\">Must match OD, \u0627\u0644\u0648\u0632\u0646, range, \u0627\u0644\u0648\u0635\u0644\u0629, \u0627\u0644\u0648\u0635\u0644\u0629 OD\/ID and drift<\/td><td class=\"has-text-align-center\" data-align=\"center\">Must also match make-up \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, shoulder condition, hardbanding and inspection class<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">\u0627\u0644\u062a\u0639\u0628-sensitive areas should be reviewed carefully. Slip marks, hardbanding edges, \u0627\u0644\u062a\u0622\u0643\u0644 pits, upset transitions, \u0627\u0644\u0627\u062d\u062a\u0643\u0627\u0643 weld zones and \u0627\u0644\u062e\u064a\u0637 shoulders can become initiation points under repeated bending or vibration.<\/p>\n\n<p class=\"wp-block-paragraph\">A \u0627\u0644\u0628\u0626\u0631-specified G105 \u0627\u0644\u0633\u0627\u0642 may perform better than a poorly matched S135 \u0627\u0644\u0633\u0627\u0642 if the \u0627\u0644\u0648\u0635\u0644\u0629, inspection class and \u0627\u0644\u062a\u0639\u0628 exposure are properly controlled. A \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 that is correct by \u0627\u0644\u062f\u0631\u062c\u0629 but wrong by \u0627\u0644\u0648\u0635\u0644\u0629 or \u0627\u0644\u0648\u0635\u0644\u0629 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 \u0627\u0644\u062d\u0641\u0631 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 \u0627\u0644\u062f\u0631\u062c\u0629 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 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631, 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 \u0633\u0627\u0626\u0644 \u0627\u0644\u062d\u0641\u0631 chemistry;<\/li>\n\n\n\n<li>hardness control of \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 body, \u0627\u0644\u0648\u0635\u0644\u0629 and weld zone;<\/li>\n\n\n\n<li>surface condition, \u0627\u0644\u062a\u0622\u0643\u0644 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 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631<\/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 \u0627\u0644\u0628\u0626\u0631s. 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 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 are not only \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 bodies. A complete \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0648\u0635\u0644\u0629 includes the seamless \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 body, upset transition, \u0627\u0644\u0627\u062d\u062a\u0643\u0627\u0643 weld zone, \u0627\u0644\u0648\u0635\u0644\u0629, pin \/ box \u0627\u0644\u062e\u064a\u0637, shoulder, drift path and sometimes internal coating or hardbanding.<\/p>\n\n<p class=\"wp-block-paragraph\">\u0627\u0644\u0648\u0635\u0644\u0629 control is often where field problems appear.<\/p>\n\n<p class=\"wp-block-paragraph\">Common \u0627\u0644\u0648\u0635\u0644\u0629-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\">\u0627\u0644\u0648\u0635\u0644\u0629 type<\/td><td class=\"has-text-align-center\" data-align=\"center\">NC, IF, FH, REG or premium \u0627\u0644\u0648\u0635\u0644\u0629 must match the existing \u0627\u0644\u0633\u0627\u0642<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0627\u0644\u0648\u0635\u0644\u0629 OD<\/td><td class=\"has-text-align-center\" data-align=\"center\">Affects \u0627\u0644\u062a\u0622\u0643\u0644, handling and coMPatibility with \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631 design<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0627\u0644\u0648\u0635\u0644\u0629 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 \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646<\/td><td class=\"has-text-align-center\" data-align=\"center\">Must match \u0627\u0644\u0648\u0635\u0644\u0629 design and \u062d\u0641\u0627\u0631\u0629 \u0627\u0644\u062d\u0641\u0631 practice<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0627\u0644\u062e\u064a\u0637 gauge record<\/td><td class=\"has-text-align-center\" data-align=\"center\">Confirms \u0627\u0644\u062e\u064a\u0637 form, shoulder condition and \u0627\u0644\u0648\u0635\u0644\u0629 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 \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 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 \u0627\u0644\u0648\u0635\u0644\u0629 \u0627\u0644\u062a\u0622\u0643\u0644 and \u0627\u0644\u062a\u063a\u0644\u064a\u0641-friendly performance<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">\u0627\u0644\u062e\u064a\u0637 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 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 with NC50 \u0627\u0644\u0648\u0635\u0644\u0629. But \u201c5\u2033 G105 NC50\u201d or <a href=\"__PROTECTED_0__\">\u201c5\u2033 S135 NC50\u201d <\/a>is still not a complete order description. \u0627\u0644\u0648\u0635\u0644\u0629 OD, \u0627\u0644\u0648\u0635\u0644\u0629 ID, upset type, range, drift dia\u0645\u062a\u0631, hardbanding and inspection documents must also be confirmed.<\/p>\n\n<p class=\"wp-block-paragraph\">When \u0627\u0644\u0648\u0635\u0644\u0629 geometry, shoulder contact or make-up \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 becomes the controlling factor,<strong><a href=\"__PROTECTED_0__\"> special \u0627\u0644\u062e\u064a\u0637ed \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 <\/a><\/strong>can be reviewed to match the existing \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631 and \u062d\u0641\u0627\u0631\u0629 \u0627\u0644\u062d\u0641\u0631-side \u0627\u0644\u0648\u0635\u0644\u0629 requirements.<\/p>\n\n<p class=\"wp-block-paragraph\">If the \u0627\u0644\u0648\u0635\u0644\u0629 is not suitable, the \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 may meet API 5DP mechanical requirements but still fail during \u062d\u0641\u0627\u0631\u0629 \u0627\u0644\u062d\u0641\u0631-site matching or make-up \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 control. \u0627\u0644\u062f\u0631\u062c\u0629 strength cannot compensate for wrong \u0627\u0644\u0648\u0635\u0644\u0629 geometry.<\/p>\n\n<h2 class=\"wp-block-heading\">Inspection and Document Review for G105 and S135 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631<\/h2>\n\n<p class=\"wp-block-paragraph\">Inspection is the step that turns a \u0627\u0644\u062f\u0631\u062c\u0629 name into verifiable \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631. For G105 and S135, the review should cover the \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 body, upset area, \u0627\u0644\u0627\u062d\u062a\u0643\u0627\u0643 weld zone, \u0627\u0644\u0648\u0635\u0644\u0629, \u0627\u0644\u062e\u064a\u0637 \u0627\u0644\u0648\u0635\u0644\u0629, drift path, marking and final document package. The purpose is not only to prove the \u0645\u0642\u0627\u0648\u0645\u0629 \u0627\u0644\u062e\u0636\u0648\u0639, but also to show that each \u0627\u0644\u0648\u0635\u0644\u0629 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 \u0627\u0644\u0648\u0635\u0644\u0629 is checked for \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 number, size, \u0627\u0644\u062f\u0631\u062c\u0629, range, \u0627\u0644\u0648\u0635\u0644\u0629, heat number, stencil marking, color band and \u0627\u0644\u062e\u064a\u0637 protector condition.<\/td><td>Confirms that the physical \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 matches the order, MTC and packing list.<\/td><\/tr><tr><td><strong>Dimensional inspection<\/strong><\/td><td>OD, \u0633\u0645\u0627\u0643\u0629 \u0627\u0644\u062c\u062f\u0627\u0631, length, straightness, upset dimensions, \u0627\u0644\u0648\u0635\u0644\u0629 OD\/ID and shoulder dimensions are measured with calibrated tools.<\/td><td>Confirms fit-up, \u0627\u0644\u0633\u0627\u0642 coMPatibility, 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 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 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 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 body and \u0627\u0644\u0648\u0635\u0644\u0629 is visually checked and normally reviewed by NDT according to the ITP.<\/td><td>Controls one of the most critical transition areas under \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, bending and tensile load.<\/td><\/tr><tr><td><strong>Tool joint inspection<\/strong><\/td><td>\u0627\u0644\u0648\u0635\u0644\u0629 OD, ID, shoulder face, hardbanding area and pin \/ box condition are checked before release.<\/td><td>Ensures \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 transfer, \u0627\u0644\u062a\u0622\u0643\u0644 resistance, \u0627\u0644\u0648\u0635\u0644\u0629 matching and handling reliability.<\/td><\/tr><tr><td><strong>Thread gauge inspection<\/strong><\/td><td>Pin and box \u0627\u0644\u062e\u064a\u0637s are checked by proper \u0627\u0644\u062e\u064a\u0637 gauges. Shoulder condition, \u0627\u0644\u062e\u064a\u0637 form, \u0627\u0644\u0635\u0646\u0628\u0648\u0631er and visible damage are reviewed.<\/td><td>Confirms that the \u0627\u0644\u0648\u0635\u0644\u0629 can be made up correctly at the \u062d\u0641\u0627\u0631\u0629 \u0627\u0644\u062d\u0641\u0631 site.<\/td><\/tr><tr><td><strong>Drift test<\/strong><\/td><td>A specified drift mandrel is passed through the \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 bore and \u0627\u0644\u0648\u0635\u0644\u0629 ID.<\/td><td>Verifies internal clearance for \u0633\u0627\u0626\u0644 \u0627\u0644\u062d\u0641\u0631 flow and down\u0627\u0644\u0628\u0626\u0631 tool passage.<\/td><\/tr><tr><td><strong>Hardness test<\/strong><\/td><td>Hardness readings are taken on the \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 body, \u0627\u0644\u0648\u0635\u0644\u0629 or weld zone when required by \u0627\u0644\u062f\u0631\u062c\u0629, 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 iMPact 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, \u0627\u0644\u062e\u064a\u0637 gauge records and packing list are coMPared against \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 marking.<\/td><td>Confirms traceability from material heat to final shipped \u0627\u0644\u0648\u0635\u0644\u0629.<\/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=\"\u062a\u0636\u0645\u064a\u0646 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_\u0627\u0644\u062d\u0641\u0631_\u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628_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 \u0627\u0644\u062f\u0631\u062c\u0629 is higher strength. For G105, \u0627\u0644\u062a\u0639\u0628, \u0627\u0644\u0648\u0635\u0644\u0629 coMPatibility and mixed-\u0627\u0644\u0633\u0627\u0642 traceability are often the practical control points.<\/p>\n\n<h2 class=\"wp-block-heading\">Selection Risks When CoMParing G105 and S135 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631<\/h2>\n\n<h3 class=\"wp-block-heading\">Strength \u0627\u0644\u062f\u0631\u062c\u0629 Is Only One Part of the Selection<\/h3>\n\n<p class=\"wp-block-paragraph\">S135 provides higher \u0645\u0642\u0627\u0648\u0645\u0629 \u0627\u0644\u062e\u0636\u0648\u0639 than G105, but higher strength does not automatically make the \u0633\u0627\u0642 \u0627\u0644\u062d\u0641\u0631 safer. \u0627\u0644\u062a\u0639\u0628 exposure, \u0627\u0644\u0648\u0635\u0644\u0629 damage, \u0627\u0644\u062e\u064a\u0637 shoulder \u0627\u0644\u062a\u0622\u0643\u0644, 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 \u0627\u0644\u062f\u0631\u062c\u0629<\/h3>\n\n<p class=\"wp-block-paragraph\">G105 should not be treated as a low-\u0627\u0644\u062f\u0631\u062c\u0629 option. It is a high-strength API 5DP \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u062f\u0631\u062c\u0629 that can be suitable for medium-to-\u0628\u0626\u0631 \u0639\u0645\u064a\u0642s, \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0627\u062a\u062c\u0627\u0647\u064a and controlled high-load sections when \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, \u0627\u0644\u0633\u062d\u0628 and \u0627\u0644\u062a\u0639\u0628 exposure remain within the accepted range.<\/p>\n\n<h3 class=\"wp-block-heading\">\u0627\u0644\u0648\u0635\u0644\u0629 and \u0627\u0644\u0648\u0635\u0644\u0629 Details Control Field Matching<\/h3>\n\n<p class=\"wp-block-paragraph\">A \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 specification should not stop at \u0627\u0644\u062f\u0631\u062c\u0629 and OD. \u0627\u0644\u0648\u0635\u0644\u0629 type, \u0627\u0644\u0648\u0635\u0644\u0629 OD\/ID, shoulder condition, make-up \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 and \u0627\u0644\u062e\u064a\u0637 gauge records directly affect \u062d\u0641\u0627\u0631\u0629 \u0627\u0644\u062d\u0641\u0631-site matching, \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 transfer and \u0627\u0644\u0648\u0635\u0644\u0629 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 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 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 \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 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 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 are both high-strength API 5DP \u0627\u0644\u062f\u0631\u062c\u0629s, but they are not selected by strength number alone. G105 is often the balanced choice for medium-to-\u0628\u0626\u0631 \u0639\u0645\u064a\u0642s and controlled \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0627\u062a\u062c\u0627\u0647\u064a where X95 is not enough but S135 may be unnecessary. S135 is selected when deeper, longer, higher-\u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646 or more complex \u0627\u0644\u062d\u0641\u0631 profiles require a stronger \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 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 \u0645\u0642\u0627\u0648\u0645\u0629 \u0627\u0644\u062e\u0636\u0648\u0639, but it is not automatically better for every \u0627\u0644\u0628\u0626\u0631. G105 may be suitable when load, \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, dogleg severity and \u0627\u0644\u062a\u0639\u0628 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 \u0645\u0642\u0627\u0648\u0645\u0629 \u0627\u0644\u062e\u0636\u0648\u0639, while S135 has 135 ksi minimum \u0645\u0642\u0627\u0648\u0645\u0629 \u0627\u0644\u062e\u0636\u0648\u0639. Final selection should also include \u0627\u0644\u0648\u0635\u0644\u0629, \u0627\u0644\u0648\u0635\u0644\u0629, \u0627\u0644\u062a\u0639\u0628, 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 \u0627\u0644\u0628\u0626\u0631s where higher load margin than X95 is required. Dogleg severity, \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, \u0627\u0644\u0633\u062d\u0628, \u0627\u0644\u062a\u0639\u0628 exposure and \u0627\u0644\u0648\u0635\u0644\u0629 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 \u0627\u0644\u062f\u0631\u062c\u0629 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, \u0627\u0644\u062e\u064a\u0637 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\/ar\/%d8%a7%d8%aa%d8%b5%d9%84-%d8%a8%d9%86%d8%a7\/\">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 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 and S135 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 are high-strength API 5DP \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u062f\u0631\u062c\u0629s used in \u0627\u0644\u062f\u0648\u0627\u0631 \u0627\u0644\u062d\u0641\u0631 \u0627\u0644\u0633\u0627\u0642s to carry axial load, transmit \u0639\u0632\u0645 \u0627\u0644\u062f\u0648\u0631\u0627\u0646, circulate \u0633\u0627\u0626\u0644 \u0627\u0644\u062d\u0641\u0631 and connect the \u062d\u0641\u0627\u0631\u0629 \u0627\u0644\u062d\u0641\u0631 to the bottom-\u0627\u0644\u0628\u0626\u0631 assembly. Both are normally manufactured from heat-treated seamless alloy steel \u0627\u0644\u0623\u0646\u0627\u0628\u064a\u0628 bodies with upset ends, then \u0627\u0644\u0627\u062d\u062a\u0643\u0627\u0643-welded to &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/www.drillpipes.com\/ar\/g105-vs-s135-%d8%a3%d9%86%d8%a8%d9%88%d8%a8-%d8%a7%d9%84%d8%ad%d9%81%d8%b1\/\" class=\"more-link\">Read more<span class=\"screen-reader-text\"> &#8220;G105 vs S135 \u0623\u0646\u0628\u0648\u0628 \u0627\u0644\u062d\u0641\u0631&#8221;<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":15668,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","footnotes":""},"categories":[105],"tags":[],"class_list":["post-15661","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-105"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - 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