Abstract
The mechanism of refracturing fractiue turning in horizontal wells was studied. The turning radius of fractures under different stress conditions was calculated by numerical simulation. The research results indicate that with the increase of time, the fracture turning radius increases gradually, and the change of the fractiu e turning radius is no longer obvious after the optimal fracturing time is reached. The variation law of reservoir str ess field in the process of refracturing was studied, and the net pressure conditions in the fracture that produce complex fractures were given. Based on these studies, a mechanical calculation model for crack opening was established. Tire opening and extension laws of refracturing fractures under different conditions were calculated and analyzed by finite element method: with the increase of the difference of horizontal principal stress, the difficulty of opening natural cracks gradually increases; with the increase of induced stress perpendicular to the direction of hydraulic fractures. natural fractures are relatively easy to open.
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