Model of Initiation Angle under Hydraulic Refracturing Subtitle as Needed

Considered pore pressure of the injection/production around the refracturing well under coupling liquid/solid, Mathematical models were established, which were the maximum principal stress and orientation angle of maximum principal stress induced by pore pressure around refracturing wells. Considered that the initial artificial fracture was full of incompetent and compressible fluid, affection efficient of fluid is presented, the model of stress field induced by initial artificial fracture was established. According to the linear superimposition law, model of stress field distribution around refracturing well was established. According to the breakdown formula of the crack, model of initiation angle of refracturing was set up. The variation range of the refracturing initiation angle was obtained. Both the calculation and the production results of two refracturing wells are compared, which shows that the calculation of the refracturing initiation angle is accurate, and the method is practical.