钻井用不停泵循环阀设计及现场试验

Design and Field Tests of Continuous Circulation Vale for Drilling

钻井过程中钻井液不间断循环,可保证在上、卸钻杆操作过程中井下压力的稳定,解决井壁坍塌、溢流、沉砂卡钻一系列问题。为实现钻井过程中钻井液的连续循环,设计一种钻井用不停泵连续循环阀,应用有限元软件ANSYS对所设计的阀体结构进行分析,计算阀体在不同工况下的应力。结果表明,连续循环阀阀体结构的最大应力小于材料的屈服应力,强度满足要求。现场试验证明不停泵循环阀工作可靠,可实现钻井过程中钻井液连续循环。

The drilling fluid continuous circulation during drilling can ensure the downhole pressure stable while connecting or disconnecting the drill pipe and resolve a series of drilling problems caused by circulation break, such as the lower wall caving, overflow and the drill tools sticking, etc. In order to achieve a continuous cycle of drilling fluid during the drilling process, the continuous circulation vale(CCV) for drilling is put forward. The structure of CCV is analyzed by using ANSYS software. The stress of vale body structure is calculated. The results show that the maximum stress of valve body structure is less than the material yield stress and meets the strength requirements. The field test proves that CCV is reliable in performance and can achieve continuous circulation of drilling fluid during the drilling process.