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中文摘要：
重复压裂技术是低渗透油田增产增效的主要措施，造裂缝有利于打开储层的油气通道，新裂缝的延伸轨迹一直是压裂设计的核心问题并具有很大难度。从力学角度分析，裂缝的延伸主要受周围应力的控制，为此，考虑初次人工裂缝内流体的可压缩性，引入流体压缩因子，建立了初次人工裂缝诱导应力场模型；根据势的叠加原理，建立了重复压裂井周围孔隙压力模型，根据Wright的多孔弹性理论，计算了孔隙压力诱导应力场；考虑温度的影响，建立温度诱导应力场模型，根据线性叠加原理计算重复压裂前总应力场，给出裂缝转向的力学条件：计算了受3口水井影响的1口油井周围应力，其理论计算结果与现场实测结果吻合较好.
英文摘要：
Refracturing is the main method to stimulate and beneficiate low permeability oilfields. The reservoir fairway will be easily opened with cracks by refracturing. The extended track of new refracturing cracks is always the key problem in fracture designing and is hard to be calculated. From the perspective of mechanics, fracture extension is mainly controlled by surrounding stress. Then the fluid compressibility in initial crack is taken into account, the compressibility factor is introduced, and the induced stress field model of initial artificial crack is created. Based on the superposition principle of potential, the model of pore pressure around refracturing wells is built. Induced stress field of pore pressure is calculated according to the Wright＇s poro - elastic theory, The model of temperature induced stress field is created considering the effect of temperature. The total stress field is calculated before refracturing on the basis of the linear superposition principle. All mechanical quantities of fracture diversion are figured out, Stress around one oil well is calculated, which is affected by three water wells. There is well coincidence between computational solution and measured results.
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