Method for modeling and simulating three-dimensional discrete element for shale pneumatic and hydraulic fracturing

A modeling and simulation, hydraulic fracturing technology, applied in earth cube drilling, special data processing applications, mining fluids, etc., can solve the problems of discrete element model theory and implementation complexity, and affect the simulation and prediction of hydraulic fracturing process

Active Publication Date: 2013-12-04
NANJING UNIV
View PDF2 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the simulation of hydraulic fracturing involves complex factors such as rock anisotropy, stress conditions, primary fractures, and water-rock interaction, as well as multi-field coupling. The estab

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for modeling and simulating three-dimensional discrete element for shale pneumatic and hydraulic fracturing
  • Method for modeling and simulating three-dimensional discrete element for shale pneumatic and hydraulic fracturing
  • Method for modeling and simulating three-dimensional discrete element for shale pneumatic and hydraulic fracturing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] In order to better understand the technical content of the present invention, specific embodiments are given together with the attached drawings for description as follows.

[0014] Such as Figure 1-4 As shown, according to a preferred embodiment of the present invention, a three-dimensional discrete element modeling and simulation method for hydraulic fracturing of shale gas comprises the following steps:

[0015] (1) Establish a random model: input the mechanical properties of shale and the geometric parameters of the model, establish a three-dimensional hexagonal closest-packed square model according to the model and particle size, and apply the conversion formula to set the mechanical parameters of the particles; through the normal distribution of particle diameter Adjustment and random stacking, that is, by adjusting the diameter and random stacking of particles, a microscopically random and macroscopically isotropic model is constructed, that is, an overall isotr...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a method for modeling and simulating a three-dimensional discrete element for shale pneumatic and hydraulic fracturing. The method includes the steps of (1) establishing a three-dimensional close packing model with specific elastic property and destructive property according to a conversion formula, and establishing an integrated isotropic random module through particle diameter normal distribution adjustment and random packing, (2) adjusting the diameter of particles according to given confining pressure, setting particle anisotropic ellipsoid parameters, moving the boundary of the models, adjusting the confining pressure to the given value, and finally connecting a particle solidification model to obtain an anisotropic shale model with specific confining pressure and mechanical property, (3) establishing a hydraulic pressure cavity model and a hydraulic pressure boundary model according to requirements, generating hydraulic pressure and stress waves through mutual extrusion of water particles, and simulating generation and development of hydraulic fractures. The method avoids human influences of a traditional method based on continuity mechanics, can simulate the processes of hydraulic pressure propagation and hydraulic fracturing more really, and achieves predication of shale pneumatic and hydraulic fracturing.

Description

technical field [0001] The invention relates to the technical field of shale gas hydraulic fracturing simulation, in particular to a three-dimensional discrete element modeling and simulation method for shale gas hydraulic fracturing. Background technique [0002] The hydraulic fracturing process is the main way to obtain shale gas. It is of great practical significance to determine the formation and development laws of hydraulic fractures under different lithology, stress, and fracture development conditions. However, the field measurement and indoor test of the hydraulic fracturing process have problems such as high cost and difficult detection. Studying the hydraulic fracturing process through computer numerical simulation and other technologies has the advantages of low cost, high efficiency, and repeatability. The current hydraulic fracturing simulation method is based on the continuum mechanical method (such as the finite element method), which requires additional hy...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G06F19/00E21B43/26
Inventor 刘春施斌朱莉莉索文斌贾东王小林李一泉
Owner NANJING UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap