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- W2893241137 abstract "Abstract Hydraulic fracturing is one of the key technologies for effective exploitation of unconventional reservoirs such as tight gas, shale gas and coalbed methane. Discontinuities such as natural fractures and bedding are developed in these reservoirs, which makes them among the most technically complicated reservoirs. Significant amounts of oil and gas are often strapped within the matrix. Network fracturing techniques often implemented to increase the connectivity of matrix and natural fractures and enhance the production. Current techniques lack adequate understanding of complex propagation and distribution of hydraulic fractures in fractured formations, which precludes any meaningful optimization and prediction of the effect of fracturing treatment. In this study, a fluid-solid coupled shear fracture network propagation model considering dual media, permeability anisotropy and stress sensitivity is built to simulate the fracture network morphology in tight gas formation. A quasi-continuous method is adopted to describe the discontinuous problem due to the pre-existing fractures, which greatly reduces the cost of calculation. The developed code is flexible enough to allow either shear fracturing of matrix or pre-existing fractures or secondary shearing of induced fractures to be examined on the basis of reservoir conditions during the fracturing process. Fracture morphology is acquired by examining the failure condition of each element which precludes presetting fracture propagation path. Different cases of simulation will be presented to study some important features of fracturing in unconventional reservoirs on the basis of naturally fractured tight gas reservoir condition in of eastern Sichuan Basin, China. It is found that reservoir condition, like in-situ stress difference, significantly affect the width of fracture network. The hydraulic fractures prone to shear along the pre-existing fractures and the phenomenon became more obvious under smaller pre-existing fractures orientation condition. Besides, weak mechanical property of pre-existing fractures is conductive to the formation of complex fracture network." @default.
- W2893241137 created "2018-10-05" @default.
- W2893241137 creator A5051749273 @default.
- W2893241137 date "2018-09-24" @default.
- W2893241137 modified "2023-09-25" @default.
- W2893241137 title "Simulation of Network Fracturing in Tight Gas Formation with Coupled Shear Fracture Propagation Model" @default.
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- W2893241137 doi "https://doi.org/10.2118/194035-stu" @default.
- W2893241137 hasPublicationYear "2018" @default.
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