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    某超深復(fù)雜井二開套管井下泄漏原因分析

    Investigation of Reasons for In-well Leakage of Secondary-drilling Casing as Used in a Certain Extra-deep Complicated Well

    • 摘要: 完井深度8 024 m的某超深復(fù)雜井，在完井測試過程中，二開套管在2 964.6 m處發(fā)生泄漏。通過調(diào)查和理論計算發(fā)現(xiàn)，導(dǎo)致二開套管泄漏的原因主要是：二開套管固井質(zhì)量不好，形成超長的水泥空段，套管柱坐掛噸位偏低，導(dǎo)致水泥空段套管在井下發(fā)生彎曲失穩(wěn)；三開鉆井周期過長，進(jìn)尺緩慢，且頻繁起下鉆作業(yè)，導(dǎo)致鉆具不斷磨損套管內(nèi)壁，當(dāng)磨損導(dǎo)致套管的剩余壁厚無法承受井內(nèi)載荷，套管發(fā)生泄漏失效。

       

      Abstract: During the well completion testing to a certain extra-deep complicated well with 8 024 m completion depth, leakage takes place with the secondary drilling case at the point of 2 964.6 m.Based on relevant investigation and theoretic calculation, the reasons for the said leakage are indentified as follows.Due to poor cementation quality of the casing, there exist cement-free sections, and this causes low sitting/hanging tonnage of the casing string, and thus leads to the casing in the cement-free section bends, and gets unstable.And because of rather long third drilling period, slow drilling footage and over frequent drill up-and-down operations, the drilling tool constantly abrades the inner surface of the casing, and once the casing is worn to be too thin to bear the load in the well, leakage failure eventually takes place.

       

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