Fracture propagation laws simulation of temporary plugging and diverting fracturing in shale gas reservoir
Temporary plugging and diverting fracturing technology is one of the important methods to improve unconventional oil and gas productivity,and has been widely used in the stimulation of unconventional oil and gas reservoirs.In order to further understand the propagation characteristics of temporary plugging and diverting fracturing fractures in shale gas reservoirs in Weiyuan area,the pressure response of temporary plugging and diverting fracturing and the fracture morphology of rock samples were studied by true triaxial large physical model experiment,and the feasibility of complex fracture network by temporary plugging was vertified.The fracture initiation law after temporary plugging and diverting fracturing is clarified under different stress difference conditions.At the same time,the cohesive unit of ABAQUS software is used to simulate the initiation and propagation of fractures,and the propagation laws of temporary plugging and diverting fracturing under different horizontal stress differences and different deflection angles are studied.The research results show that the horizontal stress difference has a significant effect on the opening and propagation of the primary fracture and the temporary plugging and diverting fracture.The smaller the horizontal stress difference,the greater the fracture pressure of the rock sample during the primary and secondary fracturing,and the less easily the rock is crushed.With the increasing resistance of fracture propagation,the in-fracture net pressure and fracture width are increased.The smaller the angle between the new fracture opened after the secondary propagation of the intersecting fracture and the primary fracturing,the better the new fracture propagation effect This study has certain reference significance for on-site fracturing and fracture network shape prediction in Weiyuan area
shale gas reservoirtemporary plugging and divertingtrue triaxial large physical modelnumerical simulationhorizontal stress difference
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