Deep oil and gas reservoir hydraulic fracture propagation numerical simulation method

Abstract

The invention discloses a deep oil and gas reservoir hydraulic fracture propagation numerical simulation method which comprises the following steps: acquiring natural fracture distribution information, generating a discrete natural fracture system geometric model, determining hydraulic fracture propagation simulation related parameters according to actual engineering problems, establishing a deepoil and gas reservoir hydraulic fracture propagation mathematical model, carrying out numerical calculation based on the model to obtain a numerical simulation result, and carrying out fracturing effect analysis according to the numerical simulation result. According to the method, the elastic-plastic constitutive equation is adopted to describe rock nonlinear deformation in the deep oil and gas reservoir fracturing process, fluid flow in a shaft, fluid flow in a crack and fluid flow in a matrix are coupled, accurate simulation of the hydraulic fracture propagation process of the deep oil andgas reservoir is achieved, quantitative analysis is conducted on the fracturing effect, and an effective means is provided for prediction, evaluation and optimization of artificial fracturing of the deep oil and gas reservoir.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a numerical simulation method for hydraulic fracture propagation of deep oil and gas reservoirs based on elastic-plastic constitutive equations. Background technique [0002] In recent years, the consumption of oil and gas resources in my country has been increasing day by day, and the dependence on foreign oil has been increasing year by year. At the same time, with the long-term exploration and exploitation of medium and shallow oil and gas fields, it has become increasingly difficult to make major breakthroughs in the middle and shallow layers of the basin, and the exploration and development of deep oil and gas resources has become an inevitable trend. Deep oil and gas reservoirs are relatively dense due to their deep burial, and most of them are low porosity and low permeability. Artificial fracturing is required to improve the reservoir development eff...

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Problems solved by technology

However, the existing hydraulic fracture propagation models and numerical simulation techniques are based on the theory of linear elastic fracture mechanics, that is, the rock is assumed to be a linear elastic medium, so it cannot be used for artificial fracturing simulation of deep oil and gas reservoirs

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