A Simulation Method for Temporary Plugging Agent Flow in Complex Fracture Network of Hot Dry Rock
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A technology of flow simulation and temporary plugging agent, applied in CAD numerical modeling, instrument, design optimization/simulation, etc., can solve the problem that the movement state of temporary plugging agent cannot be truly reflected.
Active Publication Date: 2022-03-08
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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[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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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 temporary plugging agents in complex fracture networks of hot dry rocks. The method studies the migration process of granular temporary plugging agents in complex fractures of hot dry rocks, and constructs a physical model of complex fractures and simulated particles. The CFD-DEM coupling model of the transport process of the type temporary plugging agent in the complex fracture network of dry hot rocks, the particles of the temporary plugging agent are regarded as discrete phases, the fluid is regarded as a continuous phase, and the interaction between particles and fluids and the interaction between particles are considered. At the same time, the influence of temperature changes on the deformation, aggregation and friction coefficient of temporary plugging agent particles is also considered to realize the bidirectional coupling calculation of continuous phase and particle phase. The movement of temporary blocking agent particles follows Newton’s second law, and its motion equation is solved in the Lagrangian coordinate system to obtain information such as the position, velocity and force of the temporary blocking agent at different times, thereby overcoming the Euler-Euler description. The defect of the method truly reflects the movement process of the particles.
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...
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