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为掌握应力干扰的优化设计方法和手段,分别建立应力场变化的平面模型和数值模型.采用对比模拟分析的方法,提出压裂滤失引起的孔隙压力升高与人工裂缝支撑对应力场的影响互为反作用,从而导致诱导应力场在裂缝附近存在非转向区域,且可通过优化裂缝间距和缝内净压力来消除非转向区域的论点.研究结果表明:水平主应力差为2 MPa,单缝扩展时缝内净压力为16 MPa可消除非转向区域;水平差应力为8 MPa,净压力为18 MPa下,两条裂缝间距为30~60m可消除裂间的非转向区域;水平差应力8 MPa和缝间距为20 m以下,净压力为19 MPa可消除裂间的非转向区域.现场试验时通过水平井段内分簇射孔,并优化施工参数,实现了裂缝间的应力干扰,裂缝复杂程度得以提高.
In order to grasp the optimal design method and means of stress disturbance, the plane model and the numerical model of stress field are established respectively.According to the method of comparative simulation, the influence of pore pressure rise caused by fracturing fluid loss and the stress field of artificial fracture support Which leads to the existence of non-steering area near the crack in the induced stress field and eliminates the non-steering area by optimizing the crack spacing and the net pressure in the fracture.The results show that the difference of the horizontal principal stress is 2 MPa, When the net pressure in the slot is 16 MPa, the non-steering area can be eliminated. The horizontal difference stress is 8 MPa and the net pressure is 18 MPa. The distance between the two cracks is 30-60 m. MPa and the gap of 20m, the net pressure of 19 MPa can eliminate the non-steering area of the fissure.When the field test is carried out, the perforation in the horizontal well section is optimized and the construction parameters are optimized to realize the stress interference between the fissures Complexity can be improved.