Device and application as well as coal underground gasification leakproofness evaluation system and method

A stress-strain and experimental technology, applied in coal gasification, underground mining, earthwork drilling and mining, etc., can solve the lack of dynamic detection means for crack development, the inability to simulate the occurrence state of coal seams, and the inability to realize the development of water-conducting fissure zones in gasification areas. Communication on issues such as aquifer status

Active Publication Date: 2021-09-28
PETROCHINA CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, there are few reports on patents and research results on the evaluation test device and test method of underground coal gasification in foreign countries. The research on the airtightness of underground coal gasification mainly follows the hydraulic pressure stabilization loading system developed by China University of Mining and Technology. The system mainly has the following problems: 1. It is impossible to simulate the real underground coal gasification reaction, and it is impossible to study the impact of different gasification agent types and gasification agent processes on the airtightness of the gasification area; 2. It is impossible to simulate the occurrence state of coal seams, that is, it is impossible to simulate The vertical stress, horizontal stress and pore pressure on the coal seam; 3. It is impossible to simulate the development of the water-conducting fracture zone in the gasification area and the communication of the aquifer; 4. There is a lack of dynamic detection means for fracture development, and it is impossible to monitor the roof and floor of the coal seam during the gasification process. Dynamic detection of damage evolution and crack development

Method used

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  • Device and application as well as coal underground gasification leakproofness evaluation system and method
  • Device and application as well as coal underground gasification leakproofness evaluation system and method
  • Device and application as well as coal underground gasification leakproofness evaluation system and method

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Embodiment 1

[0109] This embodiment provides a kind of airtight evaluation device applicable to the pollution evaluation of underground coal gasification. The structure of the airtight evaluation device is as follows: Figure 1-Figure 11 As shown, it specifically includes the airtightness evaluation device body (i.e. the experimental cabin),

[0110] The airtightness evaluation device body is provided with a gasification chamber 62 (i.e. an experimental chamber), an airtightness evaluation device shell (i.e. an experimental cabin shell) and refractory bricks 13; the airtightness evaluation device shell is located outside the gasification chamber 62, and the refractory bricks 13 is located in the cavity between the shell of the airtightness evaluation device and the gasification chamber 62; wherein,

[0111] The shell of the airtightness evaluation device is made of high-pressure resistant steel plate with a thickness of 1cm, which can withstand high pressure of 35MPa and high temperature o...

Embodiment 2

[0119] This embodiment provides an underground coal gasification pollution evaluation system applicable to underground coal gasification pollution evaluation. The underground coal gasification pollution evaluation system is as follows: Figure 12-Figure 15 As shown, it specifically includes the airtightness evaluation device provided in Example 1, gasification agent preparation unit, confining pressure, pore pressure loading unit, synthesis gas processing unit, data acquisition unit and ignition unit; gasification agent preparation unit and airtightness evaluation The gasification agent injection channel 10 of the device is connected to inject the gasification agent into the airtightness evaluation device; The confining pressure injection pipeline is connected with the pore pressure injection pipeline to apply confining pressure and pore pressure to the airtightness evaluation device; the synthesis gas processing unit is connected with the first syngas output channel 29 of the ...

Embodiment 3

[0128] This embodiment provides a method for evaluating airtightness of underground coal gasification, which uses the pollution evaluation system for underground coal gasification provided in Example 2 to carry out the process as follows Figure 16 As shown, the method includes:

[0129] 1) Prepare the roof, floor 25 and coal seam 24 for the gasification test: Carry out rock mechanics tests according to the core data of the roof and floor of the coal seam in the area to be simulated, and measure the mechanical properties (elastic modulus, Poisson's ratio, tensile strength, compressive strength), combined with the principle of material similarity to prepare the top plate and bottom plate 25 for gasification tightness evaluation; the roof includes the direct roof 23 of the coal seam and the indirect roof, and the indirect roof includes a tight water-resisting layer 22, an aquifer 19 and an upper formation 17 , the upper formation 17 is 0.25m thick, 2.2m long, and 1.5m wide, the ...

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Abstract

The invention provides a device and application as well as a coal underground gasification leakproofness evaluation system and method. The device comprises an experiment module; the experiment module is provided with an experiment cavity; the experiment cavity comprises an experiment cavity end cover and an experiment cavity barrel body which are detachably connected; the experiment cavity barrel body is composed of a double-layer cylinder body and a barrel bottom; the double-layer cylinder body comprises an inner cylinder and an outer cylinder a cavity is formed between the outer cylinder and the inner cylinder; a confining pressure applying component is arranged in the cavity and is connected with a confining pressure pipeline; a pore pressure injection hole is formed in the cylinder wall of the inner cylinder and is connected with a pore pressure pipeline; an experiment fluid injection channel and an experiment fluid output channel are arranged on the experiment cavity end cover and / or the barrel bottom of the experiment cavity barrel body; and the experiment fluid injection channel and the experiment fluid output channel both communicate with the interior of the inner cylinder of the experiment cavity. The device can simulate real occurrence conditions of coal, and specifically can simulate confining pressure and pore pressure of a deep coal seam. The device is matched with other equipment to realize coal underground gasification leakproofness evaluation considering real occurrence conditions of a coal seam.

Description

technical field [0001] The invention belongs to the technical field of underground coal gasification, and relates to a device and application, and an evaluation system and method for airtightness of underground coal gasification. Background technique [0002] Underground coal gasification combines the three major processes of well construction, coal mining and gasification. It builds the gasification reactor in the underground coal seam. According to production needs, the coal can be pyrolyzed in a controlled manner through reasonable ground control methods. gasification, producing CH 4 、H 2 This technology can effectively exploit the coal seam resources in the middle and deep (more than 800m) that cannot be developed by mining engineering, and can realize the effective production of thin coal seams, high sulfur content, high ash content, high dip angle and "three lower" coal seams. Moreover, compared with surface coal gasification, underground coal gasification has more ad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/243E21B43/295E21B47/06E21B49/00
CPCE21B43/243E21B43/295E21B47/06E21B49/00Y02E30/30
Inventor 东振薛华庆陈艳鹏孙粉锦陈姗姗张福东刘人和彭涌赵永明
Owner PETROCHINA CO LTD
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