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    某井油管脫扣原因分析

    Analysis of Causes for Pull-out of Tubing as Used in a Certain Oil Well

    • 摘要: 針對某井用Φ88.9mm×6.45mm P110鋼級NU油管脫扣事故進行深入調查研究,對脫扣的油管進行了宏觀和微觀形貌分析,對油管材質進行了理化性能試驗,對該批次未使用的油管接頭試樣進行了參數(shù)測量。通過試驗分析和研究,認為油管接頭材質及螺紋參數(shù)符合標準要求,油管脫扣屬于低載荷滑脫失效,滑脫失效的主要原因是由于粘扣和上扣不到位導致接頭的連接強度大幅度降低造成,而粘扣和上扣不到位的主要原因是上扣過程中發(fā)生了錯扣。

       

      Abstract: For the thread-tripping failure of the Φ88.9 mm×6.45 mm P110 NU tubing as used in a certain oil well, an in-depth investigation is conducted, involving such activities as macro/micro morphology analysis of the failing tubing, physicochemical testing of the material, parameter measurement of the tubing connectors which are of the same product lot, but not yet used. Based on the testing and research results, it is identified that since both the material and the thread parameters of the tubing connector are up to applicable specification, the pull-out failure is defined as a low-load thread stripping case; and that the main causes for such a failure are thread galling and inappropriate thread making-up of the connector, which result in tremendous reduction of the connection strength; and what caused the thread galling and inappropriate thread making-up mistakes is just thread alternating as occurred during the making-up process.

       

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