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Method for draining gas by heating coal bed through drilling

A technology of heating method and mining method, which is applied in the directions of gas discharge, earth-moving drilling, mining fluid, etc., can solve the problems of inability to carry out the seepage phase, the effect of coalbed methane mining is weak, etc., and achieve effective and rapid gas drainage, increase in cracks, increase The effect of coal fissures

Inactive Publication Date: 2012-04-04
田力龙
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  • Application Information

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Problems solved by technology

In the process of gas drainage, these two steps are indispensable. For low-permeability coal seams, because the seepage stage cannot be carried out, the displacement technology has little effect on the exploitation of coalbed methane

Method used

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  • Method for draining gas by heating coal bed through drilling
  • Method for draining gas by heating coal bed through drilling
  • Method for draining gas by heating coal bed through drilling

Examples

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Embodiment Construction

[0033] figure 1 For the coal seam to be extracted, the gas drainage borehole (1) is firstly drilled in the coal seam, and the appropriate drainage borehole is selected as the heat source hole (2), ensuring that the heat source hole (2) has a radius of 0.5m on the More than 6 drainage boreholes, then reaming the heat source hole, the reaming distance is to pass through the protective seam coal seam (6), after the drilling is done, lay anchor nets (4) on the coal seam surface and use anchor rods (3 ) reinforcement.

[0034] Put the heating equipment of the coal seam into the heat source hole (2), and fix the heating equipment with the heat insulating material (5) at the first 1 / 3 of the hole to ensure that the coal seam (6) of the protective layer is not heated. The coefficient selects whether to carry out enhanced drainage measures on the coal seam to increase the air permeability of the coal seam.

[0035] After the equipment is connected, the heating equipment is operated t...

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Abstract

The invention discloses a method for draining gas from an underground coal bed. The method comprises the following steps of: firstly, establishing a drill site in the coal bed to be drained; then, punching an anchor net (4) and anchor rods (3) in the surface of and around the coal bed to reinforce the coal bed; selecting at least one of the drill holes to serve as a heat source hole (2); performing negative pressure drainage of the gas through other drainage drill holes (1) by using drainage equipment; protecting a protective layer coal bed (6) by using a heat insulating material (5) to prevent a protective layer from being heated; heating the coal bed except the protective layer coal bed (6) by using heating equipment; heating the coal bed to 80-200 DEG C; and after the coal bed is heated, quickly desorbing the adsorbed gas into free gas. The volume of the free gas is increased, the gas pressure in the coal bed is increased, the development of fractures in the coal bed is promoted due to the increased gas pressure of the coal bed, the flow of the coal bed gas is facilitated, and the aim of quickly and efficiently draining the coal bed gas can be fulfilled under the action of the negative pressure drainage drill holes (1).

Description

technical field [0001] The invention relates to a mining method for underground coal seam gas extraction, which is particularly suitable for using the coal seam drilling site to heat the coal seam to drain the gas in the coal seam. Background technique [0002] Mine gas is an associated gas product of coal, also known as coal bed methane or coal bed methane. It is a kind of self-generated and self-storage or gas reservoir natural gas that occurs in the coal seam and its surrounding rocks. The gas in the coal seam has three kinds of occurrence states, one is the adsorption state, it is adsorbed on the micropores of the coal (coal is a porous substance) by the surface adsorption force of the coal, and in a certain temperature and pressure relief environment, Adsorbed gas can be desorbed into free gas. The second is free gas, which exists in the primary and secondary fractures and pores of coal and can move freely. It is part of the gas that is not connected by adsorption for...

Claims

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Application Information

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IPC IPC(8): E21B43/24E21F7/00
Inventor 田力龙
Owner 田力龙
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