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Embedded discrete fracture model-based fractured well modeling and simulation method

A technology of discrete fracture model and simulation method, which is applied in the field of fracturing well modeling and simulation based on embedded discrete fracture model, which can solve the problems of indescribable distribution of artificial diversion fractures and large amount of calculation

Active Publication Date: 2016-06-08
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

At present, the methods for simulating fractures are mainly divided into continuous model and discrete model. The continuous model is suitable for the situation where fractures are densely distributed and interconnected, and cannot describe the sparsely distributed artificial diversion fractures. Therefore, the discrete fracture model is used to accurately describe the flow in fractures. , while the general discrete fracture model requires a large number of unstructured grids to subdivide the fracture, which requires a large amount of calculation

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  • Embedded discrete fracture model-based fractured well modeling and simulation method
  • Embedded discrete fracture model-based fractured well modeling and simulation method
  • Embedded discrete fracture model-based fractured well modeling and simulation method

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[0032] In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are listed below and described in detail in conjunction with the accompanying drawings.

[0033] Such as figure 1 as shown, figure 1 It is a flowchart of a specific embodiment of the fracturing well modeling and simulation method based on the embedded discrete fracture model of the present invention.

[0034] In step 101, the bedrock system is divided into an orthogonal coarse grid and information on nodes and fractures of the coarse grid is extracted. The process goes to step 102.

[0035] In step 102, the system is divided into bedrock system and fracture system, such as figure 2 Shown, and establish flow mathematical model (shown in formula 1, 2) respectively to it;

[0036] Bedrock system flow model:

[0037] V b ∂ ∂ t ...

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Abstract

The invention provides an embedded discrete fracture model-based fractured well modeling and simulation method. The method includes: dividing a bed rock system orthogonal coarse meshes, and extracting coarse mesh nodes and fracture information; dividing the system into a bed rock system and a fracture system, and establishing a flow mathematical model for the bed rock system and the fracture system each; establishing a corresponding embedded discrete fracture net model; establishing a bed rock system numerical calculation format based on a simulation finite difference method; analyzing the numerical calculation format of fractures in bed rocks in three different embedded manners; establishing a numerical calculation format of an embedded discrete fracture net system based on a control volume finite difference method; and serving the fracture system as a source term of the bed rock system, and establishing an embedded discrete fracture flow mathematical model by coupling the fracture system and the bed rock system. The embedded discrete fracture model-based fractured well modeling and simulation method can avoid a complicated unstructured mesh generation process, and improve the accuracy and the high efficiency of a fractured well fracture description and simulation method.

Description

technical field [0001] The invention relates to the technical field of oil field development, in particular to a method for modeling and simulating a fracturing well based on an embedded discrete fracture model. Background technique [0002] Due to the low permeability, tight reservoirs must be exploited by fracturing. After fracturing, fractures with different orientations and angles are formed. Accurate description and simulation of fracturing fractures is of great significance for flow simulation of tight reservoirs. At present, the methods for simulating fractures are mainly divided into continuous model and discrete model. The continuous model is suitable for the situation where fractures are densely distributed and interconnected, and cannot describe the sparsely distributed artificial diversion fractures. Therefore, the discrete fracture model is used to accurately describe the flow in fractures. , while the general discrete fracture model requires a large number of u...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 杨勇李友全孙业恒张奎祥于伟杰高安邦阎燕王杰李弘博韩凤蕊郭建福黄成江
Owner CHINA PETROLEUM & CHEM CORP
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