定向井破裂压力计算方法及其应用

Fracture pressure calculation method of directional wells and its application

针对目前定向井破裂压力计算模型不完善的现状,开展了任意井斜和方位的破裂压力计算研究,依据破裂压力的计算原理及椭圆有关理论,建立了斜井、水平井不同井斜和方位的破裂压力计算公式。利用推导的计算方法对不同井型目的层破裂压力进行了计算,并与现场施工测量的数据进行对比,两者相对误差不超过5%,表明该计算方法具有较高的可靠性。

Aiming at the present imperfect status of fracture pressure calculation model for directional wells,the research on the fracture pressure of arbitrary well deviation and azimuth has been carried out.According to the fracture pressure calculation principles and relative theories of ellipse,the fracture pressure calculation formulas of different well deviation and azimuth for deviated wells and horizontal wells have been established.With the derived calculation method,the fracture pressures of target layers for different well types havebeen calculated.Compared with the measured data of site construction,the relative error is less than 5%,which shows that this calculation method is of high reliability.