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    旋轉(zhuǎn)固井用高抗扭氣密封套管的研制與應(yīng)用

    R ＆ D and Application of High-torque and Gas-tight Casing for Rotating-casing Cementing Technique

    • 摘要: 介紹了一種旋轉(zhuǎn)固井用特殊螺紋接頭(WSP-NF)高抗扭氣密封套管的基本結(jié)構(gòu)和設(shè)計思想,運用有限元方法,重點論述了該套管接頭抗扭設(shè)計及密封設(shè)計的方法和準(zhǔn)則,并通過全尺寸試驗進(jìn)行了驗證。計算和試驗結(jié)果表明:WSP-NF接頭具有先進(jìn)的扭矩臺肩和合理的金屬/金屬密封結(jié)構(gòu),有效地克服了API螺紋和傳統(tǒng)特殊螺紋接頭的不足,具有優(yōu)良的抗扭性能,氣密封能力達(dá)到了管體內(nèi)壁屈服壓力。該研究結(jié)果可以為開發(fā)更多適合油氣田實際的特殊螺紋接頭套管提供參考。

       

      Abstract: Described in the assay are the basic structure and main design idea of a new high torque and gas tight casing with the WSP-NF premium connection for rotating-casing cementing service. The methods and principles as used for the design of the casing connection’s anti-torque function and gas sealing function are discussed with the FEA method,and then verified by relevant full-scale tests.Resultsof related calculation and the tests demonstrate that the WSP-NF connection is in possession of an advanced torque shoulder and reasonable metal-to-metal seal structure,hence it is free of the weak points of the API connections and the convenient premium connections as well,which makes it having excellent torsion resistance,and the gas seal pressure as equal to inner surface yield stress of the pipe. The result of the above mentioned study is worth referencing for further development of casings with premium connections as suitable for actual service conditions of oil/gas fields.

       

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