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Method for precisely measuring gas slippage coefficient of low-permeability coal seam

A slippage coefficient, precise measurement technology, applied in the direction of measuring device, permeability/surface area analysis, suspension and porous material analysis, etc., can solve the problems of large error of slippage coefficient and inability to accurately predict the law of gas migration in low-permeability coal seams, etc.

Active Publication Date: 2019-11-22
TAIYUAN UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide an accurate measurement method for gas slippage coefficient of low-permeability coal seam, so as to overcome the problems that the slippage coefficient measured in the existing slippage coefficient measurement method has large errors and cannot accurately predict the law of gas migration in low-permeability coal seam

Method used

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  • Method for precisely measuring gas slippage coefficient of low-permeability coal seam
  • Method for precisely measuring gas slippage coefficient of low-permeability coal seam

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Embodiment approach 1

[0034] The specific implementation of a method for accurately measuring the gas slippage coefficient of low-permeability coal seams is as follows:

[0035] (1) According to the well test analysis data of a coalbed methane well, the average initial pore pressure of the coal seam is 9.5MPa and the initial porosity is 0.3%;

[0036] (2) The coal seam is drilled and sampled, the size of the coal sample is φ50×100mm, a total of 10, numbered 1 #~11 # . take 1 # ~10 # Carry out uniaxial compressive test, measure its elastic modulus, Poisson's ratio, take the average value, obtain elastic modulus of 2050MPa, Poisson's ratio of 0.4;

[0037] (3) Using an accurate measurement device for the gas slippage coefficient of low-permeability coal seams to 11 # The coal samples were subjected to the gas apparent permeability test.

[0038] ①Install the coal sample. The coal sample 22 is put into the sealing sleeve 20. The lower end of the coal sample 22 is connected to the metal base 27 t...

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Abstract

The invention discloses a method for precisely measuring a gas slippage coefficient of a low-permeability coal seam. The method comprises the steps of: acquiring initial pore average pressure and initial porosity of the coal seam according to well testing analysis data of a coal-bed gas well; drilling and sampling the coal seam, carrying out a uniaxial compression test, and measuring an elasticitymodulus and a Poisson's ratio of a coal sample; carrying out a coal sample permeability test by using a low-permeability coal seam gas slippage coefficient precise measuring device, and measuring a gas apparent permeability of the coal sample; carrying out a coal sample gas adsorption strain test by utilizing the low-permeability coal seam gas slippage coefficient precise measuring device, and measuring maximum volume strain and adsorption gas constants of the coal sample; calculating to obtain porosity and pore radius of the coal sample changing along with the average pore pressure; and calculating to obtain the coal sample gas slippage coefficient changing along with the average pore pressure. The method is convenient and reliable, easy to operate, high in precision and high in safety,realizes the precise measurement of the gas dynamic slippage coefficient in the coal-bed methane production process, and provides an important theoretical basis for precise prediction of the productivity in the coal-bed methane exploitation process.

Description

technical field [0001] The invention relates to a method for measuring the gas slippage coefficient, in particular to a method for measuring the gas slippage coefficient which changes with the pore average pressure during the mining process of a low-permeability coal seam. Background technique [0002] Coal reservoirs in my country are mostly dense porous media reservoirs with well-developed micron and nanometer pore structures, characterized by low permeability and low porosity. When the gas seeps in the low-permeability reservoir, there will be a "slip effect". Klinkenberg explained the cause of the slip effect by using Warburg's slip theory, pointing out that when the mean free path of gas molecules is close to the size of the capillary diameter, the Each molecule of the gas is in a state of motion, and the velocity of the gas molecules on the tube wall is no longer zero. In the percolation test, it is shown that a slip flow is added to the gas flow rate. Due to the gas ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
CPCG01N15/0826G01N15/088
Inventor 康天合张连昆康健婷李立功张晓雨张润旭
Owner TAIYUAN UNIV OF TECH
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