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Shale hydraulic fracturing three-dimensional fully coupled discrete fracture network simulation method and system

A discrete fracture network, hydraulic fracturing technology, applied in earthwork drilling, fluid extraction, measurement, etc., can solve the problem of neglecting induced stress, etc., to achieve the effect of improving the effect

Active Publication Date: 2019-03-22
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] However, the existing methods for simulating hydraulic fracturing either ignore the induced stress generated by fracture deformation, or apply a simplified two-dimensional model, or use an ideal network model limited to a small number of fractures, or use a very Idealized Semi-Analytic Approximate Solution

Method used

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  • Shale hydraulic fracturing three-dimensional fully coupled discrete fracture network simulation method and system
  • Shale hydraulic fracturing three-dimensional fully coupled discrete fracture network simulation method and system
  • Shale hydraulic fracturing three-dimensional fully coupled discrete fracture network simulation method and system

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Embodiment 1

[0051] In this embodiment, the three-dimensional fully coupled discrete fracture network simulation method for shale hydraulic fracturing according to the present invention may include: generating fractures, specifying the positions of possible hydraulic fractures in advance, and establishing a discrete fracture network; Grid division, divided into rectangular fracture units; establish the control and constitutive equations of fluid flow and mechanical calculations, simulate the expansion of hydraulic fractures and the opening and shearing of natural fractures; use the iterative method to analyze the fluid The flow control and constitutive equations and the mechanical calculation control and constitutive equations are solved, and the cross-action criterion is set to control the initiation, expansion and crossing of hydraulic fractures.

[0052] This example simulates the complex three-dimensional discrete fracture network of shale hydraulic fracturing, fully couples the relatio...

Embodiment 2

[0183] According to an embodiment of the present invention, a three-dimensional fully coupled discrete fracture network simulation system for shale hydraulic fracturing is provided, and the system includes:

[0184] memory having computer-executable instructions stored thereon;

[0185] The processor implements the following steps when executing computer-executable instructions:

[0186] Generate fractures, specify the location of possible hydraulic fractures in advance, and establish a discrete fracture network;

[0187] Mesh the discrete fracture network and divide it into rectangular fracture units;

[0188] Establish the control and constitutive equations of fluid flow and mechanical calculations, and simulate the expansion of hydraulic fractures and the opening and shearing of natural fractures;

[0189] The control and constitutive equations of fluid flow and mechanical calculation are solved by iterative method, and the cross-action criterion is set to control the ini...

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Abstract

The invention discloses a shale hydraulic fracturing three-dimensional fully coupled discrete fracture network simulation method and system. The method comprises generating fractures, specifying the locations of possible hydraulic fractures in advance and establishing a discrete fracture network; meshing the discrete fracture network into rectangular fracture units; establishing fluid flow controland constitutive equations and mechanical calculation control and constitutive equations and simulating the expansion effect of the hydraulic fractures and the opening and shearing effects of naturalfractures; using an iterative method for solving the fluid flow control and constitutive equations and the mechanical calculation control and constitutive equations and setting a cross-action criteria to control initiation, propagation and traversal of the hydraulic fractures. According to the method, the relationship between fluid flow and fracture induced stress is coupled implicitly, and the expansion effect of the multiple hydraulic fractures and the opening and shearing effects of the natural fractures are improved.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, and more specifically relates to a shale hydraulic fracturing three-dimensional fully coupled discrete fracture network simulation method and system. Background technique [0002] The classic hydraulic fracturing model is to inject liquid to generate two-dimensional hydraulic fractures, which will continue to expand in the formation (Economides and Nolte, 2000). But field monitoring shows that hydraulic fracturing may form multiple fractures, branch networks, and other complex patterns. In many practical applications, the classical hydraulic fracturing model is suitable for engineering simulation purposes, but the fracture network may become very complex in the process of shale oil and gas hydraulic fracturing, and the classical model is too simplified to be applicable anymore. The propagation of hydraulic fractures in shale rocks is affected by existing natural fractures, bedding pl...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B47/00E21B49/00
CPCE21B43/26E21B47/00E21B49/00
Inventor 孙志宇苏建政张汝生刘长印黄志文李凤霞林鑫
Owner CHINA PETROLEUM & CHEM CORP
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