重复压裂井裂缝周围应力的重定向

Stress re-orientation around fracturing of re-fractured wells

考虑重复压裂井周围注采流固耦合模型,建立垂直裂缝井孔隙压力变化的诱导应力模型;引入初次人工裂缝内流体影响因子,建立初次人工裂缝诱导应力场模型;考虑温度对储层岩石的影响,建立温度诱导应力模型.给出重复压裂造新缝的力学条件.计算了某区块受3口注水井影响的1口油井周围应力,其理论计算结果与实测结果基本吻合.

The model of liquid-solid coupling during injecting and producing was established around re-fractured wells.The stress induced by pore pressure was obtained.The affecting factor on fluid compressibility in the maiden artificial fracture was introduced.And the stress model of the maiden artificial fracture was built.The effect temperature had on reservoir had been considered.And then the stress model induced by temperature was established.The mechanical factors were put forward which were used in creating new fracture in the process of re-fracturing.The stress around some wells of the selected field is calculated and the result is in accordance with the field measurement.