Deep coal and coal bed gas combined mining method

Abstract

The invention relates to a deep coal resource mining method. When the buried depth of a coal bed is 800 to 3,000 meters, the thickness is more than 3 meters, an inclination angle is less than 10 degrees, and pressure is more than 10 Mpa, the most advanced well drilling and cementing, high-temperature resistant and high-pressure well completion technologies in oil industry, vertical shafts and vertical shafts and gas injection and gas production combined methods are adopted; the method is characterized by comprising the following steps of: drilling three vertical shafts first, wherein the distance between the wells is 500 meters; drilling a horizontal well which is more than 500 meters deep from a secondary well to a central well, combusting a long tunnel which is 1,000 meters long and 10 meters wide by a special combustion method, wherein the tunnel is a gasification tunnel special for gas production, observation, monitoring and the like, and drilling a plurality of overlong horizontal wells in the reverse direction according to the inclination gradient of the coal bed. The deep coal bed gas and the deep coal are gasified underground, and exploited in a combined way, so the problem of shortage in energy resources in China can be greatly improved, the method is a new environment-friendly, low-carbon, innovative new-energy development technology, and low in cost and has great economic value, and investment is reduced.

Description

technical field [0001] The present invention relates to a deep-seated coal and coalbed methane joint mining technology, specifically, a high-tech technology that utilizes coal underground gasification technology combined with oil production vertical wells and horizontal wells to carry out combined mining of catalytic cracking, high temperature, high pressure, and heat conduction. Coal bed methane and underground coal gasification are being exploited by the combined technology of catalytic cracking, high temperature, high pressure and heat conduction. Background technique [0002] Coalbed methane is a clean new energy source. The coalbed methane industry has developed rapidly in the United States, Canada, Australia, Russia, the United Kingdom, the Czech Republic, Germany, India and other countries, and has become another emerging natural gas industry after conventional natural gas. At the same time, the misunderstanding and prejudice of using "coal-bed methane" as "harmful ga...

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Problems solved by technology

[0004] At present, coal gasification in coal fields can definitely reduce the major environmental pollution caused by coal mining and reprocessing; at present, in my country, there are more than 10 trillion tons of coal in deep coal fields below 800 meters, which are basically in the stage of unmining, and no one has conducted research and research. development, and there is no similar technology for deep underground coal gasification technology mining and coalbed methane mining

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