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Method and equipment for simulating heat collection performance of hot dry rock containing fracture network and medium

A technology of fracture network and simulation method, which is applied in the field of heat extraction performance simulation of hot dry rock, can solve the problems of limited application scale and low calculation efficiency of model engineering, and achieves improved application scale and application range, accurate complexity, and improved embedding efficiency. and the effect of accuracy

Pending Publication Date: 2022-04-05
CHENGDU NORTH OIL EXPLORATION DEV TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing numerical simulation method for heat extraction of hot dry rock is restricted by the distribution of random natural fractures and has low calculation efficiency, and the application scale of model engineering is limited. The simulation method, equipment and medium of thermal performance of rock mining, by establishing an embedded discrete fracture model, coupling the flow and heat exchange of dry hot rock matrix system and fracture network system, in order to establish a more advanced system-wide flow and heat exchange model; based on Discontinuous-full-implicit numerical solution method to improve model calculation efficiency and engineering application scale

Method used

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  • Method and equipment for simulating heat collection performance of hot dry rock containing fracture network and medium
  • Method and equipment for simulating heat collection performance of hot dry rock containing fracture network and medium
  • Method and equipment for simulating heat collection performance of hot dry rock containing fracture network and medium

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Embodiment 1

[0105] The present invention realizes through following technical scheme:

[0106] On the one hand, the present invention provides a method for simulating the thermal recovery performance of hot dry rock with a fracture network, including:

[0107] S1. Establish a coupled model of dry hot rock matrix system and fracture network system;

[0108]S2. Establish the flow control equation of the hot dry rock matrix system and the flow control equation of the fracture network system according to S1;

[0109] S3. Establish the heat exchange control equation of the hot dry rock matrix system and the heat exchange control equation of the fracture network system according to S1;

[0110] S4. Numerical discrete and coupled solution of the flow governing equation and heat conduction governing equation established in S2 and S3.

[0111] Solve the flow control equation and heat conduction control equation by numerical discretization and coupling by establishing the coupling model of the ma...

Embodiment 2

[0185] like figure 1 As shown, it is known that the partial flow area of ​​a typical hot dry rock reservoir has a size of 100m×100m×40m, and there are random natural fractures randomly distributed within it, and the initial matrix pressure and initial fracture pressure of the reservoir are both 20MPa. Both the initial matrix temperature and the initial crack temperature of the layer are 100 °C. Set the injection conditions of constant pressure of 25MPa and constant temperature of 50°C on the left boundary of the reservoir; set the production conditions of constant pressure of 20MPa on the right boundary of the reservoir, and the upper and lower boundaries of the reservoir are immobile and heat exchange. The above boundary conditions are only set for this example, and the boundary conditions of the model can be adjusted according to the specific simulation requirements. The detailed physical parameters of the reservoir are shown in Table 1:

[0186] Table 1 Physical parameter...

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Abstract

The invention discloses a crack network-containing hot dry rock heat collection performance simulation method, equipment and a medium. The method comprises the following steps: establishing a hot dry rock matrix system and crack network system coupling model; establishing a flow control equation of a hot dry rock matrix system and a flow control equation of a fracture network system according to S1; establishing a heat exchange control equation of a hot dry rock matrix system and a heat exchange control equation of a fracture network system according to S1; and solving the flow control equation and the heat conduction control equation established in the S2 and the S3 through numerical discretization and coupling. By establishing an embedded discrete fracture model, a hot dry rock matrix system and a fracture network system are coupled, a dynamic model of fluid flow and heat exchange between systems is established, and the defects that an existing hot dry rock heat collection rule simulation method is limited by random natural fracture distribution and low in calculation efficiency are overcome. According to the method, a more advanced whole system flow and heat exchange model is established, and the model calculation efficiency and the engineering application scale are improved based on a discontinuous-fully implicit numerical solution method.

Description

technical field [0001] The invention relates to the technical field of hot dry rock mining, in particular to a method, equipment and medium for simulating the heat mining performance of hot dry rock containing a fracture network. Background technique [0002] Hot dry rock generally refers to a hot rock mass buried 3 to 10 km underground, with no fluid (or only a small amount of fluid) inside, a temperature higher than 150 °C, and development value. It is a clean energy with huge reserves. Hot dry rock is At the heart of the successful use of geothermal energy. Hot dry rock usually develops a large number of natural fractures. By means of hydraulic pressure enhancement, the natural fractures are connected to form a fracture network or the natural fractures are activated to improve their conductivity, so that cold injection wells and thermal production wells are in the same conductivity fracture network system, and the " The flow and heat transfer efficiency of cold injection...

Claims

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Application Information

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IPC IPC(8): G06F30/28G06F119/08G06F119/14
Inventor 黄静张文中米中荣李鑫武新民汪伟光孙振龙徐涛邓琪张博宁王键
Owner CHENGDU NORTH OIL EXPLORATION DEV TECH
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