Shale gas reservoir fracturing horizontal well yield prediction method and system

Abstract

The invention relates to a shale gas reservoir fracturing horizontal well yield prediction method and system, and relates to the technical field of fracturing horizontal wells. According to the method, different diffusion modes of matrixes in different areas are considered, quasi-steady-state diffusion of the matrixes in a fracture network area is described by using Fick's first law, unsteady-state diffusion of the matrixes in a pure matrix area is described by using Fick's second law, seepage of a fracture network is described by using Darcy law, and the shale gas reservoir fracturing horizontal well yield is predicted under the condition that the matrixes are coupled with micro-fractures and pressure fractures are coupled with the micro-fractures, so that the prediction precision of theshale gas well yield is improved, and the actual flow law of shale gas reservoirs can be described more accurately.

Description

technical field [0001] The invention relates to the technical field of fracturing horizontal wells, in particular to a production prediction method and system for fracturing horizontal wells in shale gas reservoirs. Background technique [0002] At present, many studies at home and abroad are based on the apparent permeability model considering the multiple flow mechanism of the matrix pores, considering the unsteady or pseudo-steady flow of the matrix and the Darcy flow or non-Darcy flow of the fracture, and establishing the matrix and Unsteady or pseudo-steady-state productivity models coupled with fractures. In matrix nanoscale pores, gas diffusion based on concentration difference is an important component of gas flow, and shale gas diffusion can be described in two different ways: pseudo-steady state diffusion and unsteady state diffusion. Since the size of the matrix block in the fracturing stimulation area and the pure matrix area is very different, and the diffusion...

AI Technical Summary

Problems solved by technology

Since the size of the matrix block in the fracturing stimulation area and the pure matrix area is very different, and the diffusion mode of gas in the matrix in different areas is also different, so in the existing research, only the pseudo-steady state diffusion or unsteady diffusion of the matrix is ​​considered in one model. State diffusion is difficult to describe the real situation of gas flow, which leads to the low accuracy of the model in predicting the production of shale gas wells

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