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

Method for directly testing permeability of underground coal seam

A test method and permeability technology, which is applied in the field of gas (coal bed methane) basic parameter testing, can solve the problems of high cost, unrepresentative test results, large differences in permeability, etc., and achieve the effect of fast data

Inactive Publication Date: 2015-02-11
HENAN COAL CHEM IND GROUP INST
View PDF4 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Permeability is an important parameter of reservoirs. Traditional acquisition methods include seismic, core analysis, well logging and well testing. The main disadvantages are time-consuming, expensive, and test results are easily affected by many factors. For coal reservoirs, the test results are not representative
The permeability of coal reservoirs is related to the success or failure of surface coalbed methane development and underground gas control measures. In view of the strong heterogeneity of coal reservoirs and the large difference in permeability, especially controlled by the structure of coal bodies, the traditional indoor sampling simulation The permeability measured by well testing and limited scope cannot represent the change trend of reservoir permeability, so how to quickly track and evaluate reservoir permeability is particularly important

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
  • Method for directly testing permeability of underground coal seam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] Embodiment: A coal mine 25051 lower floor drainage roadway in Anyang mining area constructs a layer-penetrating drill hole with a diameter of φ75mm perpendicular to the coal seam as the air supply hole 1, and constructs six borehole diameters evenly distributed on a circle that is 1m away from the center line of the air supply hole The layer-through drilling of φ75mm is used as the air outlet hole 2, and the center line of the air outlet hole is parallel to the center line of the air supply hole. The thickness of the coal seam in this area is 5m, the downhole temperature is 25°C, and the nitrogen viscosity coefficient μ=17.812μPa·s.

[0017] 1. Drilling hole diameter: 75mm, drilling radius: r=0.075 / 2=0.0375m,

[0018] Thickness of coal seam: h=5m, distance from the central gas supply hole to peripheral holes: R=1m,

[0019] formula Middle L=R-2r=1-0.075=0.925m,

[0020] A=2π(R-2r)h=29.045m 2 .

[0021] 2. Test process

[0022] When testing downhole:

[0023] (1)...

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
thicknessaaaaaaaaaa
Login to View More

Abstract

A method for directly testing the permeability of an underground coal seam sequentially includes the following steps: (1) constructing a crossing seam hole with the diameter of D and the radius of r and vertical to a coal seam in a coal mine underground rock tunnel as an gas supplying hole; (2) uniformly constructing six gas outlet holes in the circumference having a distance R to the boring centerline of the gas supplying hole; (3) respectively firmly sealing the gas supplying hole and the six gas outlet holes; (4) connecting the six gas outlet holes through a sealed gas outlet pipeline together, connecting to an gas outlet tube, directly connecting the gas outlet tube to underground gas, windpipe, the trachea and underground gas directly connected, allowing the pressure to be unchanged and p2, and installing a sensor for monitoring the flow and the concentration of nitrogen on the gas outlet tube; (5) connecting high-pressure high-purity nitrogen with the gas supplying hole through an gas supplying connecting pipeline; (6) recording the flow qk when a gas flowing out of the gas outlet tube is high purity nitrogen; and (7) calculating by adopting a steady flow process based on Darcy's law to obtain the real data of the permeability of the underground coal seam. The method has the advantages of fast data obtaining, reality and reliability.

Description

technical field [0001] The invention belongs to the technical field of gas (coal bed methane) basic parameter testing. Mainly aiming at the difficulty and poor accuracy of coal reservoir permeability testing, based on Darcy's law, a direct test method for underground coal seam permeability is established, which provides a new method for underground coal reservoir permeability. This method is quick and easy to obtain data. , true and reliable, etc., laying the foundation for the design and evaluation of underground coal mine drainage and surface coalbed methane development parameters. Background technique [0002] Permeability is an important parameter of reservoirs. Traditional acquisition methods include seismic, core analysis, well logging and well testing. The main disadvantages are time-consuming, expensive, and test results are easily affected by many factors. For coal reservoirs, the test results are not representative. The permeability of coal reservoirs is related ...

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 Applications(China)
IPC IPC(8): G01N15/08G01N7/10
Inventor 陶云奇杨程涛马耕李伍成王进尚孟杰王洪盘张军波王峰
Owner HENAN COAL CHEM IND GROUP INST
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