A Calculation Method of Mass Transfer Between Matrix and Fracture in Discrete Fractures
A technology of discrete fractures and matrix, applied in the field of oil and gas reservoir seepage, it can solve problems such as large calculation error, inability to accurately calculate the mass transfer between matrix and fractures, and the spatial configuration relationship between controlled fractures and grids.
Active Publication Date: 2020-09-04
CHINA UNIV OF PETROLEUM (BEIJING)
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[0005] The embodiment of the present invention provides a method for calculating the mass transfer between the matrix and the fracture in discrete fractures, to solve the problem that the method in the prior art is limited by the spatial configuration relationship between the fracture and the grid, especially for irregular grids, the calculation error is relatively large , the problem that the mass transfer between the matrix and the fracture cannot be accurately calculated
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[0083] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0084] Different from the background technology, the embodiment of the present invention is based on the embedded discrete fracture model, regards the fracture and the associated background grid as a local reservoir, and uses the boundary element method to establish an analytical solution for the flow between the arbitrary shape grid and the fracture, and accurately describes the different networks. The mass transfer law under the grid shape and fracture-grid s...
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The invention provides a method for calculating mass transfer between matrixes and cracks in discrete cracks, and relates to the technical field of oil-gas reservoir seepage. The method comprises thefollowing steps of: obtaining oil reservoir information which comprises matrixes and cracks in a seepage area, generating a background grid for expressing the matrixes and an embedded unit for expressing the cracks, and determining geometric information between the matrixes in the background grid and the cracks in the embedded unit; determining a transfer coefficient relationship between the matrixes under the background grid and crack fluid channeling by adoption of a well index method in Peaceman deduction numerical simulation according to the geometric information; coupling finite volume flow solutions of the matrixes and the cracks with boundary element solutions of the transfer coefficient relationship-based matrixes and crack fluid channeling according to a preset flow and a preset pressure continuity condition, and carrying out flow simulation to generate a flow simulation data; and obtaining and displaying seepage field distribution data of unstable seepage of compressible fluids in stratums under conditions of fracture surface cracks and a complicated crack grid in real time according to the flow simulation data.
Description
technical field [0001] The present application relates to the technical field of seepage in oil and gas reservoirs, in particular to a calculation method for mass transfer between matrix and fracture in discrete fractures. Background technique [0002] At present, the embedded discrete fracture model can characterize the distribution of fractures well, but the accurate calculation of mass transfer and channeling between matrix and fracture directly affects the calculation accuracy of the embedded discrete fracture model. Reducing the complexity of fracture-to-grid division and improving the accuracy of mass transfer calculations between matrix grids and discrete fractures are the keys to finely simulating fluid flow in fractured reservoirs. [0003] At present, the numerical simulation of fractured reservoirs is mostly based on the dual-media model, but this dual-media model is only suitable for reservoirs with a high degree of fracture development. When there are several la...
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IPC IPC(8): G06F30/20
CPCG06F30/20
Inventor 曹仁义方思东程林松贾品黄世军薛永超
Owner CHINA UNIV OF PETROLEUM (BEIJING)