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Method for simulating flow of temporary plugging agent in hot dry rock complex fracture network

A technology of flow simulation and temporary plugging agent, which is applied in CAD numerical modeling, instrumentation, electrical and digital data processing, etc.

Active Publication Date: 2021-09-03
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of this, the purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for simulating the flow of temporary plugging agents in the complex fracture network of hot dry rocks to solve the problem that the numerical simulation in the prior art cannot truly reflect the movement state of the temporary plugging agents. question

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  • Method for simulating flow of temporary plugging agent in hot dry rock complex fracture network
  • Method for simulating flow of temporary plugging agent in hot dry rock complex fracture network
  • Method for simulating flow of temporary plugging agent in hot dry rock complex fracture network

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Embodiment 1

[0100] According to an embodiment of the present invention, a method for simulating the flow of a temporary plugging agent in a complex fracture network of hot dry rock includes:

[0101] Step S1, constructing a complex fracture geometric model, and determining the geometric form of the complex fracture geometric model;

[0102] Step S2, determining the required mathematical model, including the continuous phase mathematical model, the discrete phase mathematical model and the two-way coupling equation; the fluid medium in the calculation area is regarded as the continuous phase, and the movement of the continuous phase is solved by the volume averaged Navier-Stokes equation; The granular temporary plugging agent is regarded as a discrete phase, and the translation and rotation of the particles in the discrete phase are solved by Newton's law of motion; the interaction between the continuous phase and the discrete phase is solved by two-way coupled equations to solve the intera...

Embodiment 2

[0126] According to another embodiment of the present invention, a method for simulating the flow of temporary plugging agents in complex fracture networks of hot dry rocks includes the following five parts: input module, complex fracture network model construction, mathematical model construction, and CFD-DEM coupling calculation process and calculation results.

[0127] 1. Input module initialization

[0128] Before the calculation starts, it is first necessary to import the geometric model of the complex fracture, and then perform the initial setting of the coupling module, including the initial velocity of the fluid, fluid viscosity and density, fluid temperature, specific heat capacity, thermal conductivity, etc.; secondly, it is necessary to set the temporary plugging agent in the DEM module Temporary plugging agent diameter, density, thermal conductivity, initial temperature, mass concentration, injection rate, friction coefficient between particles and wall surface and...

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Abstract

The invention relates to a method for simulating the flow of a temporary plugging agent in a hot dry rock complex fracture network. The method comprises the following steps: researching the migration process of the granular temporary plugging agent in the complex crack of the hot dry rock; building a complex fracture physical model and a CFD-DEM coupling model for simulating the transportation process of the granular temporary plugging agent in the hot dry rock complex fracture network; taking temporary plugging agent particles as a dispersed phase, and taking fluid as a continuous phase; considering the interaction between the particles and the fluid and the interaction between the particles; meanwhile, considering the influence of temperature change on relevant attributes such as particle deformation, aggregation and friction coefficient of the temporary plugging agent, so that bidirectional coupling calculation of a continuous phase and a particle phase is realized. The movement of the particles of the temporary plugging agent follows the Newton second law, the movement equation of the particles is solved under a Lagrange coordinate system, and information such as the position, the speed and the stress condition of the temporary plugging agent at different moments is obtained, so that the defects of an Euler-Euler description method are overcome, and the movement process of the particles is truly reflected.

Description

technical field [0001] The invention relates to the technical field of numerical simulation of temporary plugging and diversion fracturing of hot dry rocks, in particular to a flow simulation method for temporary plugging agents in complex fracture networks of hot dry rocks. Background technique [0002] With the rapid development of my country's economy, the demand for energy is increasing day by day. At the same time, the energy crisis and environmental problems that my country is facing in the process of industrial development are becoming more and more serious. my country's existing energy structure is dependent on fossil fuels such as coal and oil. There are many problems such as high dependence on imported fossil fuels and serious environmental pollution, and there is an urgent need to develop new alternative energy sources with large reserves and environmental friendliness. In recent years, hot dry rock geothermal resources, which are widely distributed in my country a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/28G06F111/10G06F113/08G06F119/08G06F119/14
CPCG06F30/28G06F2113/08G06F2119/14G06F2111/10G06F2119/08
Inventor 汪道兵秦浩郑臣董永存韩东旭宇波
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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