Glutenite hydrofracture simulation method based on discrete element

A technology of hydraulic fracturing and simulation method, applied in the field of hydraulic fracturing of glutenite oil and gas reservoirs, can solve the problem of complex fracture initiation mechanism of glutenite hydraulic fracturing, fracture distribution, influence on expansion, and difficulty in accurately characterizing rock mechanical flow-stress - Issues such as displacement coupling

Active Publication Date: 2019-02-22
QINGDAO UNIV OF SCI & TECH
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Problems solved by technology

However, due to the high degree of geometric heterogeneity and the induced stress heterogeneity and strength heterogeneity, the fracture initiation mechanism and fracture distribution of glutenite hydraulic fracturing are more complicated, and due to the existence of gravel, the hydraulic fracture Frequent interaction with gravel further affe

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  • Glutenite hydrofracture simulation method based on discrete element
  • Glutenite hydrofracture simulation method based on discrete element
  • Glutenite hydrofracture simulation method based on discrete element

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Embodiment Construction

[0055] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings, but is not limited thereto.

[0056] The specific calculation steps of a sandy conglomerate hydraulic fracturing simulation method based on discrete elements are as follows:

[0057] S 1 , Generate particles according to the particle size distribution curve, construct wellbore, and perform initial balance calculation;

[0058] S 2 1. Randomly generate gravel, use the cutting method to divide the balanced particles into matrix and gravel, and assign different physical parameters respectively, and cement adjacent particles to generate a discrete element numerical model;

[0059] S 3 , Add the seepage field to the discrete element numerical model according to the fluid network flow model;

[0060] S 4 , Set the maximum and minimum horizontal principal stress, and apply confining pressure based on the servo system;

[0061] S 5 , Set the b...

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Abstract

The invention relates to a glutinite hydrofracture simulation method based on a discrete element. The method comprises the following steps of: S1, constructing a wall and a well bore, generating particles according to a size grading curve, and performing initial balance calculation, S2, dividing the particles into a matrix and gravel by a cutting method, endowing the matrix and the gravel with different cementing parameters, S3, adding a seepage field and endowing a corresponding flow parameter, S4, applying confining pressure on the external wall based on a servo system, setting a fluid injection speed, S5, monitoring cementing states of the particles in real time, and judging whether micro cracks are generated according to the cementing states, and S6, continuing simulation till penetration of hydraulic cracks occurs. The glutinite hydrofracture simulation method based on the discrete element can characterize crack initiation and expansion mechanisms of the hydraulic cracks preciselyfrom a microscale, and accurately capture a macro distribution morphology of the hydraulic cracks, so that the understanding of a field engineer on an expansion rule of the hydraulic cracks of a glutinite reservoir is enhanced; and a fracture design is improved.

Description

technical field [0001] The invention relates to the technical field of hydraulic fracturing of glutenite oil and gas reservoirs, in particular to a simulation method for hydraulic fracturing of glutenite based on discrete elements. Background technique [0002] Glutenite widely exists in tight oil and gas reservoirs, but due to its high burial depth, glutenite usually has the characteristics of low permeability and low porosity, so hydraulic fracturing technology is required for stimulation operations to form fractures with high conductivity underground. Enhance the ability of oil and gas to flow into the well, and then increase the productivity of oil and gas wells to achieve economical and efficient production. Clarifying the fracture initiation mechanism and the final distribution of fractures in glutenite hydraulic fracturing is the prerequisite for the implementation of hydraulic fracturing technology, and has important guiding significance for fracturing design. Howev...

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Application Information

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IPC IPC(8): G01N33/24
CPCG01N33/24
Inventor 张国栋牛若冰巣昆李小婧李佳欣
Owner QINGDAO UNIV OF SCI & TECH
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