Ground stereoscopic discharge and mining method of coal bed methane

A coalbed methane and ground technology, applied in gas discharge, mining fluid, mining equipment, etc., can solve the problems of complex geological conditions, low reservoir permeability, poor overall benefit, etc. The effect of cleaning costs

Inactive Publication Date: 2009-09-23
赵万福
View PDF1 Cites 26 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to the objective factors such as complex geological conditions and low reservoir permeability, the reasons for the low average gas production of single wells and poor overall benefits in the

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
  • Ground stereoscopic discharge and mining method of coal bed methane
  • Ground stereoscopic discharge and mining method of coal bed methane
  • Ground stereoscopic discharge and mining method of coal bed methane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0031] figure 1 Shown is a schematic diagram of the ground three-dimensional drainage of coalbed methane in the present invention. The three-dimensional ground drainage method of coalbed methane is to destroy the unconventional natural gas system that is formed over hundreds of millions of years of coal reservoirs (10), which is relatively independent and in equilibrium, breaks the equilibrium state of the system, makes it relatively homogeneous, and establishes a The new coal reservoir system that is conducive to drainage adopts the main well for drainage. In the coal seam around the main shaft (1), build a plurality of caves (3) (hereinafter referred to as "caves" for short) by directional inclined shafts (2) to form a coal seam stress concentration zone; During the process, the stress of the coal seam is released, which is beneficial to the desorption and seepag...

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

The invention relates to a ground stereoscopic discharge and mining method of coal bed methane. The ground stereoscopic discharge and mining method adopts a main shaft to discharge and mine the coal bed methane and is mainly characterized by damaging a natural coal reservoir system, breaking the balance state of the system, leading the system to be homogenized relatively and creating a new coal reservoir system which is beneficial to discharging and mining. In the coal bed around the main shaft, a cavity is built by a directional inclined shaft so as to form a region of stress concentration of the coal bed, the stress of the coal bed around the cavity is released in the process of stress homogenization of the coal bed, and the coal bed is led to generate extension and shear damage, thus forming a new crack, forming interference among the cavities, causing communication of coal bed cracks which are in closed or semi-closed state and further forming a large area of air permeable flow channel. The method has the characteristics of low engineering risk, wide application range and the like, can realize high-efficiency methane discharge and improve the productivity of the coal bed gas shaft.

Description

technical field [0001] The invention belongs to coal bed methane (gas) mining technology, and is a ground drainage method for improving the production capacity of coal bed methane wells. Background technique [0002] Coalbed methane is a kind of resource. my country's coal reservoirs have low gas saturation, low permeability, low reservoir pressure (reservoir energy), low resource abundance, high geostress, strong heterogeneity (including reservoir sex and permeability) and other characteristics. Compared with the Black Warrior and the San Juan Basin, where coalbed methane has been successfully developed in the United States, the main problem in the development of coalbed methane in my country is low permeability, which is 2 to 3 orders of magnitude lower than that in the United States; compared with conventional oil and gas reservoirs, there are also many The big difference: the Young's modulus of coal seams is lower than that of ordinary sandstone or limestone reservoirs, g...

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
IPC IPC(8): E21B43/16E21F7/00
Inventor 赵万福
Owner 赵万福
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap