水平井裸眼选择性分段压裂完井技术及工具

为了最大限度地提高苏里格气田低压、低渗透气藏的产量,开展了低渗透气藏水平井裸眼选择性分段压裂工艺技术的研究与应用,由于完井方式的不同、井身轨迹弯曲和井眼尺寸等因素的限制,使得裸眼水平井与直井以及套管固井水平井的选择性压裂完井管串有很大区别。据此介绍了利用油管作为完井和压裂管串一趟下入裸眼水平段中,不需要下套管固井、射孔等作业,实现裸眼水平段选择性分段压裂工艺技术,并详细介绍了这种技术的管串结构、工艺原理、技术特点、配套工具以及现场的应用情况。研究与现场应用表明,采用这种技术与其他低渗透气藏压裂增产技术相比,开发效果更好,投入成本更低,经济效益显著。

The completion technology and tool for open-hole preferential staged fracturing of the horizontal well

To improve the gas production as much as possible in low-pressure and low-permeability reservoirs of Sulige Gasfield,the research and application of the open-hole preferential staged fracturing technology of the horizontal well was conducted.Due to different completion methods and the limits of wellbore trajectory curve and borehole dimensions,there is a remarkable difference in preferential fracturing completion string between open-hole horizontal well,straight hole and casing cementing horizontal well.Therefore,it is introduced that tubing is used as completion and fracturing string to run into the long horizontal open-hole interval,with no need of operations such as running casing,cementing and perforation,thus achieving the preferential staged fracturing technology of open-hole horizontal interval.The string structure,technological principle,supporting tools of the technology and its field application are introduced in detail.The research and field application showed that compared with fracturing production growth technologies used in other low-permeability gas reservoirs,this technology had a better effect of oil exploitation with low cost.