Fully coupled simulation method of reservoir, fracture and wellbore in fractured horizontal well

Abstract

The invention provides an oil deposit, crack and shaft fully-coupled simulating method of a fractured horizontal well. The method comprises the steps of acquiring input parameters for productivity predication number simulation; inputting the input parameters to a pre-built coupling module which coupling a crack, an oil deposit and a shaft; performing fully implicit scheme for the coupling model to solve to obtain the productivity predication number simulation result of the fractured horizontal well. According to the method, the pre-built complete coupling module which coupling the crack, the oil deposit and the shaft is treated as the basis, and the fully implicit scheme is performed for the coupling mode in which the input parameters are input by the N-R iteration method, so as to synchronously solve the oil deposit, crack and shaft parameters; the coupling relationship of the crack, the oil deposit and the shaft is considered, the flow rate between the oil deposit and the crack and the flow rate between the crack and the shaft are taken into account, besides the oil deposit and the crack, so that the obtained well productivity predication number simulation result is highly matched with the actual condition of the fractured horizontal well.

Description

technical field [0001] The invention relates to the technical field of geological exploration numerical simulation, in particular to a fully coupled simulation method for fracturing horizontal well reservoirs, fractures and well bores. Background technique [0002] Since the 1990s, horizontal well technology has been widely used in the development of oil and gas fields. Horizontal wells increase the contact area between wells and reservoirs, increase oil and gas production and ultimate recovery, and the development of horizontal well technology has solved some problems that vertical wells cannot effectively solve. However, for low-permeability reservoirs, single-well productivity is still very low simply by relying on horizontal well development, which is determined by the characteristics of low-permeability reservoirs. Due to low permeability, large seepage resistance, and poor connectivity, horizontal wells are required To further increase production and ultimate recovery...

AI Technical Summary

Problems solved by technology

It can be seen that from the perspective of the processing and solving process of the numerical model, the existing models have not realized the real coupling between reservoirs, fractures and wellbores, and cannot realize the calculation of parameters such as pressure and saturation in reservoirs, fractures and wellbores. Simultaneous computing

[0006] Therefore, the existing fracturing horizontal well reservoir, fracture, and wellbore fully coupled simulation methods all solve the parameters of fractures, reservoirs, and wellbore separately, rather than simultaneously. Therefore, it is difficult to realize the Due to the coupling between them, the obtained simulation results are difficult to match the actual situation of fractured horizontal wells

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