Method and system for optimizing artificial fracture parameters of shale gas reservoir

Abstract

The invention discloses a method and a system for optimizing artificial fracture parameters of shale gas reservoir, which comprises the following steps: establishing a fracture network model after shale gas reservoir is fractured; The coupled equations of flow and deformation in matrix and fracture are determined. Establish shale gas horizontal well productivity model after fracturing; The shale gas productivity of the post-pressure productivity model is calculated, and the artificial fracture parameters are optimized based on the principle of maximizing the productivity. The invention provides a productivity calculation method after shale gas reservoir fracturing considering the coupling of deformation and flow of porous media, and an optimal combination of artificial fracture parametersof shale gas reservoir can be obtained according to the principle of maximizing productivity.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, and more specifically relates to a method and system for optimizing parameters of artificial fractures in shale gas reservoirs. Background technique [0002] Shale gas reservoirs generally require the use of horizontal wells and large-scale hydraulic fracturing techniques to achieve commercial production capacity. After fracturing, artificial fractures and natural fractures in the reservoir are interlaced to form a network of fracture systems. It is a common method in fracturing design to optimize artificial fracture parameters by maximizing productivity, and accurately describing the complex flow in fractured reservoirs is crucial to fracture parameter design. At present, the commonly used fractured reservoir numerical simulation models are divided into two categories: continuous medium model and discrete fracture model. . The continuous medium model has been widely used in fractur...

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Problems solved by technology

This method is feasible under the assumption of uniaxial strain and constant stress, but cannot describe the impact of fluid-structure interaction effects on production under actual reservoir conditions

[0004] In summary, the calculation of shale productivity after gas pressure in the prior art is mainly based on simplified analytical solutions or dual-porosity and dual-permeability numerical models, and there are few studies on the influence of discrete artificial fractures on pressure and production. Therefore, the optimization of artificial fracture parameters also missing tools

In the study of shale gas-solid coupling, the stress sensitivity of shale matrix and fractures is often treated by theoretical modeling or equivalently as pressure sensitivity, which cannot truly reflect the fluid-solid coupling in the shale gas production process. process

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