Simulation method and system for gas flow in multi-scale fractures in shale gas reservoirs

Abstract

The invention discloses a method and system for simulating gas flow in multi-scale fractures of shale gas reservoirs. The method includes: preparing and processing data; establishing an equivalent medium model according to secondary fracture grids of shale gas reservoirs, The equivalent medium model is used as the background grid; the discrete fracture model is established according to the large-scale artificial hydraulic fracture, and the discrete fracture model is embedded in the background grid; the adjacent connection between the background grids, the background grid and all non-adjacent connections between the discrete fracture models and within the discrete fracture models, thereby establishing a dual-media model; and performing numerical simulation based on the dual-media model. The method for simulating gas flow in multi-scale fractures in shale gas reservoirs combined with the discrete fracture model and the equivalent medium model of the present invention can more accurately perform numerical simulation of shale gas reservoirs, accurately predict the productivity of shale gas wells, and lay a solid foundation for follow-up Lay the foundation for the adjustment of the development plan.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and more particularly, relates to a method and system for simulating gas flow in multi-scale fractures in shale reservoirs. Background technique [0002] Due to the tight and low permeability characteristics of shale gas reservoirs, in order to improve shale gas productivity, it is necessary to use staged fracturing horizontal well technology to reform shale gas reservoirs in the process of shale gas development. The formation of artificial hydraulic fractures and secondary fracture networks of different scales by staged fracturing technology will significantly increase the permeability of shale reservoirs, which will have a great impact on fluid flow in shale reservoirs and will directly affect the development of gas reservoirs. Therefore, accurately constructing multi-scale fracture models of shale gas reservoirs and simulating gas flow in fractures of different scales is the key...

AI Technical Summary

Problems solved by technology

This method provides the most accurate and direct solution for the numerical simulation of fractured reservoirs, but this method has high requirements for input information and a large amount of calculation

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