【摘要】 重复压裂的井由于初次压裂形成的裂缝以及油层生产导致的压力衰减等原因,近井地带的应力场将发生变化,从而在重复压裂过程中引起裂缝的重新定向。通过合理的假设,把进行重复压裂的井简化到弹性力学中的无限大平板上圆孔周围的应力集中问题,然后经过理论分析推导出判断裂缝发生转向的公式,分析了影响裂缝重新改向的几个主要因素。更多还原

【Abstract】 Around the wellbore, the distribution of compressive stress changes for both the initial fracturing and the depletion of formation pressure as a result of producing. This causes the re-orientation of fracture. This paper regards the wells of repeated fracturing and formation as a problem where there is a small hole in the middle of infinity plane and stress convergence appeared around the hole. Then it deviates the formula which can provide a method to confirm the redirection of fractures.更多还原