Method and equipment for simulating in-crack temporary plugging diversion fracturing

Abstract

The invention provides an in-crack temporary plugging diversion fracturing simulation method and equipment. The method comprises the following steps: constructing a discrete fracture model based on a discrete element method; combining the fluid flow equation and the rock mass deformation equation based on a weak coupling method, performing discrete and iterative processing on the fluid flow equation to obtain in-crack fluid pressure, and inputting the in-crack fluid pressure into the rock mass deformation equation to obtain crack width; acquiring stress borne by the virtual spring based on the crack width, judging whether the virtual spring is fractured or not according to the stress borne by the virtual spring and the maximum stress of the virtual spring, and if yes, expanding the crack; a dominant expansion path of fluid is obtained based on fracture expansion, a temporary plugging unit is arranged on the dominant expansion path, and simulation of in-fracture temporary plugging diversion fracturing is achieved. The influence of different reservoir parameters, natural fracture distribution and mechanical parameters, temporary plugging parameters and the like on fracture expansion behaviors can be quantitatively studied, and a basis is provided for in-fracture temporary plugging diversion fracture simulation and design optimization.

Description

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AI Technical Summary

Benefits of technology

This patented technology describes an improved way to study hydraulic fractures that occur naturally or artificially over time. By creating a separate model from each individual piece of rocks used to test its performance, researchers have been able to better predict how well these cracks open up when they should be temporarily sealed out with other materials like cement instead of sand. These models help scientists make more accurate predictions about future changes caused by natural factors such as tectonic activity or earthquake waves.

Problems solved by technology

This patented technical problem addressed by this patents relates to improving the efficiency at producing hydrocarbons from underground resources through horizontal well drilling techniques that involve injecting fluids downhole with specific types of chemical agents called temporary plugs (also known as bridges) before allowing for better control over these processes.

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