MATHEMATICAL MODEL OF 3D INDUCED STRESS FIELD IN REFRACTURING GAS WELL

The refracturing reorientation is fairly difficult and most important in refracturing. The refracture orientation depends on the stress field in the vertically-fractured well. The stress field, especially the horizontal principal stress orientation in the vertically-fractured well determines the azimuth of refracture creation and refracture propagation. The paper study systematically the stress characteristics of vertically-fractured gas well and the main factors affecting the change of stress value and the stress orientation. Using the theory of elasticity mechanics and fluid-solid coupling and poroelastic, we have set up the mathematical model of induced stress of refracturing gas well to quantitatively analyze and simulate stress filed before refracturing for vertically-fractured gas well.