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Optimization of Fracture Spacing in Western Sichuan Tight Gas Based on Fracture Interference

Western Sichuan Depression is a typical tight gas reservoir, the effective stimulation methods for such reservoir is staged fracturing in horizontal wells. But, scholars failed to give the method to set reasonable fracture spacing in tight gas. In this paper, Western Sichuan tight gas reservoir continuous sand body model is established by numerical simulation, through which the gas reservoir production performance in different facture spacing can be learned. Numerical pressure in the vicinity of fracture to describe the scale of fracture interference by the law of pressure drop super position. Then, net present value is used to optimize fracture spacing. The result show that 73 m is the optimal fracture spacing of II B continuous sand body in XinMa blcok .The research method is not only applicable to continuous sand body of tight gas reservoirs, but can be extended to non-continuous sand body. Furthermore it plays a constructive role in promoting the fracturing exploitation in tight gas.