水平井裸眼分段压裂套压阀研制与应用

水平井裸眼分段压裂技术作为低压、低渗透油气藏开发的重要增产措施之一,近年来在苏里格地区得到大力推广应用。套压阀是水平井分段压裂配套工具的重要组成部分,主要为压裂施工后期提供气举通道和套压监测。针对水平井施工中出现的套压阀压力打开不稳定的问题,设计了内置滑套式套压阀,利用油套压差剪断剪钉推动内置滑套移动并锁紧。同时,给出了入井管柱结构和施工工艺。该结构设计合理,打开压力稳定,能够满足现场压裂施工要求。

Research and Application of Sliding Sleeve Opened by Casing Pressure Used for Staged Fracturing in Openhole Horizontal Wells

The staged fracturing technique for open hole horizontal wells is efficient for reservoirs with low pressure,low porosity and low permeability and has been widely applied in Sulige gasfield recently.Casing valve is the important part of matching tools for staged fracturing which is mainly for providing gas lift channel and casing pressure monitor.With respect to instability problems of open pressure,casing valve of built-in sliding sleeve was designed and differential pressure between oil pipe and casing pipe cut the shearing pins and inner barrel went down to be locked.Meanwhile,running string structure and construction technology was also proposed.The design of structure is reasonable and open pressure is stable and field fracturing requirements can be satisfied.