{"id":15679,"date":"2026-06-16T11:43:11","date_gmt":"2026-06-16T03:43:11","guid":{"rendered":"https:\/\/www.drillpipes.com\/g105-vs-s135-tuberia-de-perforacion\/"},"modified":"2026-09-18T16:00:51","modified_gmt":"2026-09-18T08:00:51","slug":"g105-vs-s135-tuberia-de-perforacion","status":"publish","type":"post","link":"https:\/\/www.drillpipes.com\/es\/g105-vs-s135-tuberia-de-perforacion\/","title":{"rendered":"G105 vs S135 tuber\u00eda de perforaci\u00f3n"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">G105 tuber\u00eda de perforaci\u00f3n and S135 tuber\u00eda de perforaci\u00f3n are high-strength <strong>API 5DP tuber\u00eda de perforaci\u00f3n<\/strong> grados used in rotaria perforaci\u00f3n sartas to carry axial load, transmit par, circulate fluido de perforaci\u00f3n and connect the equipo de perforaci\u00f3n to the bottom-pozo assembly. Both are normally manufactured from heat-treated seamless alloy steel tuber\u00eda bodies with upset ends, then fricci\u00f3n-welded to alloy steel uni\u00f3ns with rotaria shouldered uni\u00f3ns. G105 has a 105 ksi minimum l\u00edmite el\u00e1stico, while S135 has a 135 ksi minimum l\u00edmite el\u00e1stico.<\/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 par margin, but the final selection should also consider pozo depth, gancho load, dogleg severity, fatiga exposure, uni\u00f3n capacity, sour-service risk, uni\u00f3n condition and inspection documents. For controlled medium-to-pozo profundos, G105 may be enough; for deeper, longer or higher-par perforaci\u00f3n 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 l\u00edmite el\u00e1stico<\/td><td class=\"has-text-align-center\" data-align=\"center\">135 ksi minimum l\u00edmite el\u00e1stico<\/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-pozo profundos, directional pozos, controlled high-load sections<\/td><td class=\"has-text-align-center\" data-align=\"center\">pozo profundos, high-par perforaci\u00f3n, extended-reach and complex pozo 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 fatiga and uni\u00f3n review<\/td><td class=\"has-text-align-center\" data-align=\"center\">Higher strength does not remove fatiga, H\u2082S or uni\u00f3n 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 par 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, rosca gauge record, uni\u00f3n check<\/td><td class=\"has-text-align-center\" data-align=\"center\">MTC, iMPact\/hardness review, NDT, rosca inspection, weld-zone and uni\u00f3n 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=\"Incrustado de 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-perforar-tuber\u00eda-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 pozo has moderate depth, controlled dogleg severity and no extreme par demand, G105 may be enough. If the pozo has high suspended sarta peso, high overpull risk, long horizontal displacement or severe rotaria par, 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 tuber\u00eda de perforaci\u00f3n grados, the number in <strong>G105<\/strong>\u00a0and <strong>S135<\/strong>\u00a0refers to the specified minimum l\u00edmite el\u00e1stico in thousands of psi. G105 means a 105 ksi minimum l\u00edmite el\u00e1stico grado, while S135 means a 135 ksi minimum l\u00edmite el\u00e1stico grado.<\/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 perforaci\u00f3n 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-par and extended-reach perforaci\u00f3n<\/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 tuber\u00eda de perforaci\u00f3n sarta is not loaded by static tension alone. During perforaci\u00f3n, the tuber\u00eda body works under combined tension, par, internal pressure, bending stress, vibration, contact desgaste and repeated make-up \/ break-out cycles.<\/p>\n\n<p class=\"wp-block-paragraph\">That is why a stronger grado cannot be treated as a universal upgrado. If the uni\u00f3n is mismatched, the uni\u00f3n shoulder is worn, the hardbanding is damaged, or the tuber\u00eda de perforaci\u00f3n lacks traceable inspection records, higher l\u00edmite el\u00e1stico will not solve the field acceptance problem.<\/p>\n\n<h2 class=\"wp-block-heading\">G105 and S135 tuber\u00eda de perforaci\u00f3n Selection by Strength and Service Demand<\/h2>\n\n<p class=\"wp-block-paragraph\">G105 and S135 tuber\u00eda de perforaci\u00f3n are both high-strength API 5DP grados, but they are usually selected for different perforaci\u00f3n demands. G105 is often used when the perforaci\u00f3n program needs higher strength than <a href=\"__PROTECTED_0__\"><strong>X95<\/strong>,<\/a> while S135 is selected when deeper pozos, longer horizontal sections or higher par demand require a stronger tuber\u00eda body. The selection should not be based on grado name alone. pozo depth, tensile load, par, fatiga exposure, uni\u00f3n type, uni\u00f3n dimensions and inspection records should be reviewed together.<\/p>\n\n<h3 class=\"wp-block-heading\">G105 tuber\u00eda de perforaci\u00f3n for Controlled High-Load perforaci\u00f3n<\/h3>\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.drillpipes.com\/es\/%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 tuber\u00eda de perforaci\u00f3n supply ranges. For many perforaci\u00f3n programs, this avoids unnecessary grado escalation when the pozo 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 vertical pozos where X95 leaves limited tensile margin;<\/li>\n\n\n\n<li>directional pozos with combined axial load and bending fatiga;<\/li>\n\n\n\n<li>build sections where par and arrastre increase;<\/li>\n\n\n\n<li>perforaci\u00f3n sartas that need higher load capacity without moving directly to S135;<\/li>\n\n\n\n<li>replacement or mixed-sarta orders where uni\u00f3n 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 tuber\u00eda body meets the grado requirement. fatiga may start at slip marks, corrosi\u00f3n pits, hardbanding defects, rosca shoulder damage or the upset transition area. A G105 order should therefore be checked by OD, nominal peso, espesor de pared, range, upset type, uni\u00f3n, uni\u00f3n OD\/ID, drift diametro, hardbanding condition and inspection class.<\/p>\n\n<h3 class=\"wp-block-heading\">S135 tuber\u00eda de perforaci\u00f3n for Deep and High-par pozos<\/h3>\n\n<p class=\"wp-block-paragraph\"><strong><a href=\"https:\/\/www.drillpipes.com\/es\/%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 tuber\u00eda de perforaci\u00f3n is often reviewed for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>deep and ultra-pozo profundos with high suspended sarta peso;<\/li>\n\n\n\n<li>long horizontal sections and extended-reach perforaci\u00f3n;<\/li>\n\n\n\n<li>high-par rotaria perforaci\u00f3n and reaming operations;<\/li>\n\n\n\n<li>high overpull risk during tripping or stuck-tuber\u00eda recovery;<\/li>\n\n\n\n<li>complex directional pozos with severe dogleg or long build sections;<\/li>\n\n\n\n<li>perforaci\u00f3n 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 sarta de perforaci\u00f3n, but it should not be treated as an automatic upgrado. Higher-strength tuber\u00eda de perforaci\u00f3n still needs careful review of fatiga exposure, sour-service risk, fricci\u00f3n weld quality, rosca condition, uni\u00f3n performance and make-up par 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 tuber\u00eda de perforaci\u00f3n, the full specification should include tuber\u00eda size, nominal peso, espesor de pared, range, upset type, uni\u00f3n, uni\u00f3n OD\/ID, drift requirement, internal coating, hardbanding, make-up par, inspection tramoard and document package. The grado name is only one part of the technical description. Field acceptance depends on whether the complete tuber\u00eda de perforaci\u00f3n junta matches the perforaci\u00f3n 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=\"Incrustado de 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-perforar-tuber\u00eda-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 tuber\u00eda de perforaci\u00f3n should be coMPared under real perforaci\u00f3n loads, not only by l\u00edmite el\u00e1stico. In the equipo de perforaci\u00f3n, the tuber\u00eda body and uni\u00f3n may work under axial tension, rotaria par, internal pressure, bending, vibration, contact desgaste and repeated make-up \/ break-out cycles. These loads often act together in directional, horizontal and extended-reach pozos.<\/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\">perforaci\u00f3n 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 vertical pozos<\/td><td class=\"has-text-align-center\" data-align=\"center\">Suspended sarta peso 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 sarta peso, overpull risk or safety margin requires a stronger tuber\u00eda body<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Directional and horizontal pozos<\/td><td class=\"has-text-align-center\" data-align=\"center\">par, arrastre and bending fatiga<\/td><td class=\"has-text-align-center\" data-align=\"center\">Check dogleg severity, uni\u00f3n capacity, uni\u00f3n condition and fatiga-sensitive areas<\/td><td class=\"has-text-align-center\" data-align=\"center\">Consider when par, arrastre and repeated bending exceed the comfortable margin of G105<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Extended-reach perforaci\u00f3n<\/td><td class=\"has-text-align-center\" data-align=\"center\">High par and long lateral displacement<\/td><td class=\"has-text-align-center\" data-align=\"center\">May be limited when horizontal displacement and par increase<\/td><td class=\"has-text-align-center\" data-align=\"center\">Often reviewed for higher tensile and par reserve, but still depends on uni\u00f3n and uni\u00f3n control<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">Replacement or mixed-sarta orders<\/td><td class=\"has-text-align-center\" data-align=\"center\">CoMPatibility with the existing sarta<\/td><td class=\"has-text-align-center\" data-align=\"center\">Must match OD, peso, range, uni\u00f3n, uni\u00f3n OD\/ID and drift<\/td><td class=\"has-text-align-center\" data-align=\"center\">Must also match make-up par, shoulder condition, hardbanding and inspection class<\/td><\/tr><\/tbody><\/table><\/figure>\n\n<p class=\"wp-block-paragraph\">fatiga-sensitive areas should be reviewed carefully. Slip marks, hardbanding edges, corrosi\u00f3n pits, upset transitions, fricci\u00f3n weld zones and rosca shoulders can become initiation points under repeated bending or vibration.<\/p>\n\n<p class=\"wp-block-paragraph\">A pozo-specified G105 sarta may perform better than a poorly matched S135 sarta if the uni\u00f3n, inspection class and fatiga exposure are properly controlled. A tuber\u00eda that is correct by grado but wrong by uni\u00f3n or uni\u00f3n 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 perforaci\u00f3n 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 grado 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 tuber\u00eda de perforaci\u00f3n, 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 fluido de perforaci\u00f3n chemistry;<\/li>\n\n\n\n<li>hardness control of tuber\u00eda body, uni\u00f3n and weld zone;<\/li>\n\n\n\n<li>surface condition, corrosi\u00f3n 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 tuber\u00eda de perforaci\u00f3n<\/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 pozos. 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 tuber\u00eda de perforaci\u00f3n are not only tuber\u00eda bodies. A complete tuber\u00eda de perforaci\u00f3n junta includes the seamless tuber\u00eda body, upset transition, fricci\u00f3n weld zone, uni\u00f3n, pin \/ box rosca, shoulder, drift path and sometimes internal coating or hardbanding.<\/p>\n\n<p class=\"wp-block-paragraph\">uni\u00f3n control is often where field problems appear.<\/p>\n\n<p class=\"wp-block-paragraph\">Common uni\u00f3n-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\">uni\u00f3n type<\/td><td class=\"has-text-align-center\" data-align=\"center\">NC, IF, FH, REG or premium uni\u00f3n must match the existing sarta<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">uni\u00f3n OD<\/td><td class=\"has-text-align-center\" data-align=\"center\">Affects desgaste, handling and coMPatibility with sarta de perforaci\u00f3n design<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">uni\u00f3n 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 par<\/td><td class=\"has-text-align-center\" data-align=\"center\">Must match uni\u00f3n design and equipo de perforaci\u00f3n practice<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">rosca gauge record<\/td><td class=\"has-text-align-center\" data-align=\"center\">Confirms rosca form, shoulder condition and uni\u00f3n 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 par 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 uni\u00f3n desgaste and revestimiento-friendly performance<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">rosca 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 tuber\u00eda de perforaci\u00f3n with NC50 uni\u00f3n. But \u201c5\u2033 G105 NC50\u201d or <a href=\"__PROTECTED_0__\">\u201c5\u2033 S135 NC50\u201d <\/a>is still not a complete order description. uni\u00f3n OD, uni\u00f3n ID, upset type, range, drift diametro, hardbanding and inspection documents must also be confirmed.<\/p>\n\n<p class=\"wp-block-paragraph\">When uni\u00f3n geometry, shoulder contact or make-up par becomes the controlling factor,<strong><a href=\"__PROTECTED_0__\"> special roscaed tuber\u00eda de perforaci\u00f3n <\/a><\/strong>can be reviewed to match the existing sarta de perforaci\u00f3n and equipo de perforaci\u00f3n-side uni\u00f3n requirements.<\/p>\n\n<p class=\"wp-block-paragraph\">If the uni\u00f3n is not suitable, the tuber\u00eda may meet API 5DP mechanical requirements but still fail during equipo de perforaci\u00f3n-site matching or make-up par control. grado strength cannot compensate for wrong uni\u00f3n geometry.<\/p>\n\n<h2 class=\"wp-block-heading\">Inspection and Document Review for G105 and S135 tuber\u00eda de perforaci\u00f3n<\/h2>\n\n<p class=\"wp-block-paragraph\">Inspection is the step that turns a grado name into verifiable tuber\u00eda de perforaci\u00f3n. For G105 and S135, the review should cover the tuber\u00eda body, upset area, fricci\u00f3n weld zone, uni\u00f3n, rosca uni\u00f3n, drift path, marking and final document package. The purpose is not only to prove the l\u00edmite el\u00e1stico, but also to show that each junta 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 junta is checked for tuber\u00eda number, size, grado, range, uni\u00f3n, heat number, stencil marking, color band and rosca protector condition.<\/td><td>Confirms that the physical tuber\u00eda matches the order, MTC and packing list.<\/td><\/tr><tr><td><strong>Dimensional inspection<\/strong><\/td><td>OD, espesor de pared, length, straightness, upset dimensions, uni\u00f3n OD\/ID and shoulder dimensions are measured with calibrated tools.<\/td><td>Confirms fit-up, sarta 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 tuber\u00eda 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 tuber\u00eda body and uni\u00f3n is visually checked and normally reviewed by NDT according to the ITP.<\/td><td>Controls one of the most critical transition areas under par, bending and tensile load.<\/td><\/tr><tr><td><strong>Tool joint inspection<\/strong><\/td><td>uni\u00f3n OD, ID, shoulder face, hardbanding area and pin \/ box condition are checked before release.<\/td><td>Ensures par transfer, desgaste resistance, uni\u00f3n matching and handling reliability.<\/td><\/tr><tr><td><strong>Thread gauge inspection<\/strong><\/td><td>Pin and box roscas are checked by proper rosca gauges. Shoulder condition, rosca form, machueloer and visible damage are reviewed.<\/td><td>Confirms that the uni\u00f3n can be made up correctly at the equipo de perforaci\u00f3n site.<\/td><\/tr><tr><td><strong>Drift test<\/strong><\/td><td>A specified drift mandrel is passed through the tuber\u00eda bore and uni\u00f3n ID.<\/td><td>Verifies internal clearance for fluido de perforaci\u00f3n flow and downpozo tool passage.<\/td><\/tr><tr><td><strong>Hardness test<\/strong><\/td><td>Hardness readings are taken on the tuber\u00eda body, uni\u00f3n or weld zone when required by grado, 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, rosca gauge records and packing list are coMPared against tuber\u00eda marking.<\/td><td>Confirms traceability from material heat to final shipped junta.<\/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=\"Incrustado de 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_perforar_tuber\u00eda_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 grado is higher strength. For G105, fatiga, uni\u00f3n coMPatibility and mixed-sarta traceability are often the practical control points.<\/p>\n\n<h2 class=\"wp-block-heading\">Selection Risks When CoMParing G105 and S135 tuber\u00eda de perforaci\u00f3n<\/h2>\n\n<h3 class=\"wp-block-heading\">Strength grado Is Only One Part of the Selection<\/h3>\n\n<p class=\"wp-block-paragraph\">S135 provides higher l\u00edmite el\u00e1stico than G105, but higher strength does not automatically make the sarta de perforaci\u00f3n safer. fatiga exposure, uni\u00f3n damage, rosca shoulder desgaste, 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 grado<\/h3>\n\n<p class=\"wp-block-paragraph\">G105 should not be treated as a low-grado option. It is a high-strength API 5DP tuber\u00eda de perforaci\u00f3n grado that can be suitable for medium-to-pozo profundos, perforaci\u00f3n direccional and controlled high-load sections when par, arrastre and fatiga exposure remain within the accepted range.<\/p>\n\n<h3 class=\"wp-block-heading\">uni\u00f3n and uni\u00f3n Details Control Field Matching<\/h3>\n\n<p class=\"wp-block-paragraph\">A tuber\u00eda de perforaci\u00f3n specification should not stop at grado and OD. uni\u00f3n type, uni\u00f3n OD\/ID, shoulder condition, make-up par and rosca gauge records directly affect equipo de perforaci\u00f3n-site matching, par transfer and uni\u00f3n 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 tuber\u00eda 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 tuber\u00eda 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 tuber\u00eda de perforaci\u00f3n are both high-strength API 5DP grados, but they are not selected by strength number alone. G105 is often the balanced choice for medium-to-pozo profundos and controlled perforaci\u00f3n direccional where X95 is not enough but S135 may be unnecessary. S135 is selected when deeper, longer, higher-par or more complex perforaci\u00f3n profiles require a stronger tuber\u00eda 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 l\u00edmite el\u00e1stico, but it is not automatically better for every pozo. G105 may be suitable when load, par, dogleg severity and fatiga 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 l\u00edmite el\u00e1stico, while S135 has 135 ksi minimum l\u00edmite el\u00e1stico. Final selection should also include uni\u00f3n, uni\u00f3n, fatiga, 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 pozos where higher load margin than X95 is required. Dogleg severity, par, arrastre, fatiga exposure and uni\u00f3n 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 grado 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, rosca 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\/es\/contacto\/\">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 tuber\u00eda de perforaci\u00f3n and S135 tuber\u00eda de perforaci\u00f3n are high-strength API 5DP tuber\u00eda de perforaci\u00f3n grados used in rotaria perforaci\u00f3n sartas to carry axial load, transmit par, circulate fluido de perforaci\u00f3n and connect the equipo de perforaci\u00f3n to the bottom-pozo assembly. Both are normally manufactured from heat-treated seamless alloy steel tuber\u00eda bodies with upset &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/www.drillpipes.com\/es\/g105-vs-s135-tuberia-de-perforacion\/\" class=\"more-link\">Leer m\u00e1s<span class=\"screen-reader-text\"> \u00abG105 vs S135 tuber\u00eda de perforaci\u00f3n\u00bb<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":15686,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","footnotes":""},"categories":[104],"tags":[],"class_list":["post-15679","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>G105 vs S135 tuber\u00eda de perforaci\u00f3n: API 5DP grado Selection Guide<\/title>\n<meta name=\"description\" content=\"G105 suits 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