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

A Drainage Method for Coalbed Gas Horizontal Wells with Power Expansion, Pressure Relief and Permeability Enhancement

A technology for horizontal wells and coalbed methane, which is applied in drilling equipment and methods, directional drilling, and fluid extraction, etc., can solve the problems of high cost, large amount of underground coal mining, hidden danger of underground gas safety, etc., and achieves improved productivity and high efficiency. The effect of rapid extraction and elimination of potential safety hazards

Active Publication Date: 2022-05-17
SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD
View PDF14 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problems of large amount of underground coal mining and high cost in mining of coalbed methane in broken, soft and low-permeability coal seams, and certain potential safety hazards in underground gas drainage, and provides a coalbed methane horizontal well power expansion, pressure relief and permeability enhancement drainage method

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
  • A Drainage Method for Coalbed Gas Horizontal Wells with Power Expansion, Pressure Relief and Permeability Enhancement
  • A Drainage Method for Coalbed Gas Horizontal Wells with Power Expansion, Pressure Relief and Permeability Enhancement
  • A Drainage Method for Coalbed Gas Horizontal Wells with Power Expansion, Pressure Relief and Permeability Enhancement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0044] 1) Drilling and completion of drainage wells:

[0045]Optimal drainage method: According to the inclination angle of the coal seam and the specific conditions of the ground, three drainage methods are selected: engineering well drainage, near-end butt joint well drainage, and far-end butt joint well drainage. When the inclination angle of the target coal seam is large, the target coal seam is uphill along the horizontal section of the horizontal well, and when the engineering well drills the coal seam at a relatively low end, the engineering well can be selected for drainage or the near-end docking well for drainage; The direction of the horizontal section of the horizontal well is downhill, and when the drainage well drills a relatively low-end coal seam, the remote butt joint well can be used for drainage.

[0046] Borehole structure of the drainage well: the diameter of the first opening is 311mm, drilled to 10m below the bedrock, the 244.5mm technical casing is run ...

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

No PUM Login to View More

Abstract

A kind of coal seam -level yarn power -dynamic diameter dynamic diameter discharge and increased pumping method, which belongs to the field of mines gas treatment and coalbed methane, can solve the large amount of coal digging projects, high costs, under wells under the well, high cost, high cost, high cost, and high costs.There is a problem with hidden safety hazards in gas pumping. In the mine preparatory area and pioneering preparation area, the ground horizontal shaft is arranged along the recovery work surface to carry out gas pre -pumping, the horizontal well is empty, and the three -open shaft structure.The sleeve or glass reinforcement sleeve, the horizontal section performs high -pressure air power expansion diameter, determine the diameter and quantity of the diameter according to the diameter of the diameter.Unsolle, improve the capacity of ground coal seams, and ensure the sustainable and high yield of coalbed methane.Gradually replaced the bottom of the bottom of the well, shorten the pre -drawing time under the well, eliminate the prominent safety hazards of the underground gas, and reduce the risk of gas overrun and the cost of mining of coal mines.

Description

technical field [0001] The invention belongs to the technical field of mine gas treatment and coalbed methane co-exploitation, and in particular relates to a coalbed methane horizontal well dynamic diameter expansion, pressure relief and anti-reflection extraction method. Background technique [0002] Due to the complex structure, soft and brittle, and ultra-low permeability of the broken soft low permeability coal seam, the coal seam has poor air permeability and has a strong adsorption capacity for coal seam gas. How to efficiently extract the gas from the broken soft low permeability coal seam It has always been a technical problem in the extraction of coalbed methane from broken, soft and low-permeability coal seams. Ground drainage of coalbed methane from broken, soft and low-permeability coal seams is difficult, with low extraction efficiency, long time, and high cost. Fractured, soft and low-permeability coal seams have always been regarded as restricted areas for sur...

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): E21B43/30E21B43/18E21B43/26E21B7/04E21B7/20E21B29/06E21B21/00E21B7/28E21B33/13
CPCE21B43/006E21B43/305E21B43/18E21B43/26E21B7/04E21B7/046E21B7/20E21B29/06E21B21/00E21B7/28E21B33/13
Inventor 张遂安李国富张江华李兵张永成刘亮亮徐云李德慧张为季长江
Owner SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD
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