CAJ | 학술논문

运用ANSYS10.0软件对重复压裂的应力场进行了模拟计算,结果表明初次人工裂缝的存在,引起近井眼处应力极大值与极小值发生转向,重复压裂将产生垂直于初次裂缝方向上的新裂缝.根据断裂力学应力强度因子准则对重复压裂新裂缝的转向过程进行了有限元模拟,绘出了新裂缝转向的轨迹;重复压裂新裂缝开始垂直干初次人工裂缝,在延伸过程中进行不断地转向,最终基本和水平最大主应力方向平行.
운용ANSYS10.0연건대중복압렬적응력장진행료모의계산,결과표명초차인공렬봉적존재,인기근정안처응력겁대치여겁소치발생전향,중복압렬장산생수직우초차렬봉방향상적신렬봉.근거단렬역학응력강도인자준칙대중복압렬신렬봉적전향과정진행료유한원모의,회출료신렬봉전향적궤적;중복압렬신렬봉개시수직간초차인공렬봉,재연신과정중진행불단지전향,최종기본화수평최대주응력방향평행.
Refracturing was a main method to stimulate and beneficiate low permeability oilfields. The re-fracturing stress field was simulated by ANSYS 10. 0. The calculation results indicate that the existence of initial artificial cracks can reorientate the maximum and minimum stress near wellbore, thus a new crack perpendicular to the initial cracks is produced. According to the fracture mechanics of stress intensity factor, finite element simulation is used to draw the steering process of the new crack. The new re-fracturing cracks perpendicular to the initial cracks is steered continuous ly in the extending process, and finally is parallel to the direction of maximum principal stress.