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Method for mining coal seam gas

A coalbed methane and gas technology, applied in mining equipment, earthwork drilling, gas discharge, etc., can solve the problems of poor drainage effect, long production cycle, slow speed, etc., to improve the drainage effect, increase the swept area, The effect of prolonging the replacement time

Inactive Publication Date: 2012-07-18
山西蓝焰煤层气工程研究有限责任公司
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Surface drilling and drainage, the production cycle is long, and the rate of gas content reduction is slow; underground drilling and drainage, the drilling equipment does not meet the requirements, and it is easy to cause hole collapse
[0004] When the pressure of the coal seam is lower than the critical abandonment pressure of the coal bed methane, neither of the above two methods can produce the coal bed methane
[0005] To sum up, the gas extraction rate of existing coalbed methane mining methods is low, and the extraction effect is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1. Drill a gas injection hole on the ground. The diameter of the gas injection hole is 139.7mm. The position of the gas injection hole is located at a horizontal distance of 400 meters from the excavation surface of the underground roadway. The drilling method of the gas injection hole is: 1. spud To 10m below the stable bedrock, use cement cementing; second spud drilling to the top of the mined coal seam 10-30m, use cement cementing; third spud drilling to 5-15m below the coal seam floor to complete the drilling.

[0033] 2. The gas injection hole is connected to the carbon dioxide pump truck; the carbon dioxide pump truck is equipped with a gas pressure monitoring device and a gas flow monitoring device;

[0034] 3. Inject carbon dioxide into the gas injection hole, the flow rate of carbon dioxide is 4.5 m 3 / min, the pressure of carbon dioxide is 7MPa;

[0035] 4. Drill an air extraction hole in the underground. The diameter of the air extraction hole is 89mm. The p...

Embodiment 2

[0039] The gas injected into the gas injection holes in this embodiment is nitrogen, and other steps and parameters are the same as those in Embodiment 1.

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Abstract

The invention discloses a method for mining coal seam gas, belonging to the field of coal seam gas mining. The method comprises the steps of: drilling a gas injection hole downwards from the ground; injecting gas into the gas injection hole; displacing the coal seam gas by the injected gas; drilling an underground pumping hole; and pumping the coal seam gas from the underground pumping hole. Through the method provided by the invention, the gas injection has a large influence range, effects are exerted on adjacent and non-adjacent drilled holes, and the coal seam gas in coal seams can be displaced to ensure that the coal seam gas adsorbed on the inner surfaces of coal matrix holes are changed from an adsorbed state to a detached state, so that the pumping effect of the coal seam gas is improved.

Description

technical field [0001] The invention belongs to a method for exploiting coal bed gas. Background technique [0002] At present, the method of exploiting coalbed methane generally adopts two methods of surface drilling and underground drilling. [0003] Surface drilling and drainage have a long production cycle and the rate of gas content reduction is slow; underground drilling and drainage, the drilling equipment does not meet the requirements, and it is easy to cause hole collapse. [0004] When the pressure of the coal bed is lower than the critical abandonment pressure of the coal bed methane, neither of the above two methods can produce the coal bed methane. [0005] To sum up, the existing methods for mining coalbed methane have low gas extraction rate and poor extraction effect. Contents of the invention [0006] The invention proposes a method for exploiting coalbed methane by gas injection with a relatively high gas extraction rate. [0007] The technical soluti...

Claims

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Application Information

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IPC IPC(8): E21F7/00
Inventor 王保玉田永东王凤清白建平赵祉友张永成李生奇张典坤常凌霄靳科科
Owner 山西蓝焰煤层气工程研究有限责任公司
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