Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Accurate measurement method of gas slippage coefficient in low permeability coal seam

A technology of slippage coefficient and coal seam gas, which is applied in the field of gas slippage coefficient measurement, can solve the problems of large slippage coefficient error and inability to accurately predict the migration law of low-permeability coal seam gas, and achieve the effect of accurate measurement

Active Publication Date: 2021-12-31
TAIYUAN UNIV OF TECH
View PDF12 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides an accurate measurement method for gas slippage coefficient of low-permeability coal seam, in order to overcome the problem that the slippage coefficient measured in the existing slippage coefficient measurement method has a large error and cannot accurately predict the law of gas migration in low-permeability coal seam

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Accurate measurement method of gas slippage coefficient in low permeability coal seam
  • Accurate measurement method of gas slippage coefficient in low permeability coal seam
  • Accurate measurement method of gas slippage coefficient in low permeability coal seam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0034] (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%;

[0035] (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;

[0036] (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.

[0037] 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 through the metal air-conducting gasket I23, and the upper end is connected to the pressure-guiding piston 16 through the metal air-conducting gasket I...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
elastic modulusaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for accurately measuring the gas slippage coefficient of a low-permeability coal seam. pressure test to determine the elastic modulus and Poisson's ratio of the coal sample; use the low-permeability coal seam gas slippage coefficient accurate measurement device to conduct the coal sample permeability test to measure its apparent gas permeability; use the low-permeability coal seam gas slippage coefficient to accurately measure The device carried out the coal sample gas adsorption strain test, and measured its maximum volumetric strain and adsorption gas constant; calculated the coal sample porosity and pore radius that changed with the average pore pressure; calculated the coal sample gas slippage coefficient that changed with the average pore pressure. The invention is convenient, reliable, easy to operate, high in precision and strong in safety, realizes the accurate measurement of the gas dynamic slippage coefficient in the coalbed methane production process, and provides an important theoretical basis for realizing the accurate prediction of the production capacity in the coalbed methane production 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 ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com