CST-ZT超高強(qiáng)直連型套管的開(kāi)發(fā)及應(yīng)用研究
Development and Application Research of CST-ZT Super-high Strength Flush-joint Casing
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摘要: 根據(jù)西部某油田開(kāi)窗側(cè)鉆水平井非常規(guī)井身結(jié)構(gòu)設(shè)計(jì)需要，開(kāi)發(fā)了Φ139.7 mm×7.72 mm 140鋼級(jí)CST-ZT超高強(qiáng)直連型特殊螺紋接頭套管。通過(guò)合理的成分設(shè)計(jì)及有效的工藝控制保證套管的強(qiáng)韌性得到良好的匹配，內(nèi)外加厚結(jié)構(gòu)設(shè)計(jì)解決接頭連接強(qiáng)度技術(shù)難點(diǎn)。分析結(jié)果表明：該套管的連接強(qiáng)度可等效于管體的70%以上，使用性能指標(biāo)優(yōu)異，抗螺紋黏結(jié)性能、抗拉伸性能、抗內(nèi)壓性能、抗擠毀性能等指標(biāo)均達(dá)到或超過(guò)了設(shè)計(jì)指標(biāo)，并順利通過(guò)了模擬在實(shí)際工況下進(jìn)行的過(guò)扭矩條件通徑試驗(yàn)、彎曲條件通徑試驗(yàn)。Abstract: To meet the need for designing the unconventional well structure of the sidetracking horizontal well as located in a certain oilfield in western China，the Φ139.7 mm×7.72 mm 140 ksi CST-ZT super-high strength flushjoint casing with premium connection is developed.Usingreasonable chemical composition design and effective manufacturing process control，satisfactory strength-toughness match of the casing is ensured，while the technical difficulty concerning the connection strength is successfully solved by means of the inner and outer upset structure. Relevant test results demonstrate that the casing features connection strength as equals to over 70%of that of the pipe body and excellent operation performances，and also has its all other properties up to or even higher than the designed indexes including thread-gulling resistance，tensile property，internal pressure resistance and collapse resistance，etc.Furthermore，the casing has passed both over-torque drifting test and bending drifting tests under operation conditions as simulated to the workshop ones.
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