井下套管阀研究及室内试验

随着欠平衡钻井技术的深入研究和推广应用,全过程欠平衡钻井技术已成为研究热点。除了常规的欠平衡装备外,全过程欠平衡钻井还需配备井下套管阀,为此,研制了一种双液控井下套管阀。为检验该阀的使用可靠性,进行了全面的室内试验和测试,试验内容包括压力密封能力,高压、有流动情况下阀板关闭的动作准确性,模拟现场阀板下憋压时打开阀板的作业程序,检测在各种密封压力时阀的微泄漏量。试验结果表明,该阀达到设计要求,能够满足全过程欠平衡作业的工艺要求。

Research and shop tests of the downhole casing shut-off valve

With the research and application of the underbalanced drilling(UBD) technology,it is demanded to maintain downhole underbalanced conditions from drilling into the reservoir to completion.Downhole casing shut-off valve(DCSV) is proved to be a best tool for this goal.Therefore,SLOF develops a kind of dual hydraulic controlled DCSV.To examine its reliability,shop tests are performed.The test criteria include static pressure performance,action accuracy between the transition of open and closure,trying out the operation procedure and measuring the leakage.The shop tests indicate that all the performance parameters can meet the design requirements.