Novel method for exploiting coal-bed gas
A coalbed methane and new method technology, applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc., can solve problems such as economic loss, slow desorption speed, casualties, etc., to increase gas output rate, accelerate penetration, improve The effect of desorption rate
Inactive Publication Date: 2011-08-24
王正东
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Problems solved by technology
[0004] The development of coalbed methane in my country is in the early stage of small-scale experiments, and a set of effective development engineering technology has not yet been formed. Every year, more than 1 billion cubic meters of coalbed methane (called gas in coal mines) are drained from coal mines, causing huge economic losses. , also has a certain impact on the environment, and there are several downhole accidents due to gas every year, causing casualties. , The desorption speed
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Embodiment Construction
[0013] A kind of novel method of coalbed methane exploitation of the present invention, comprises following technological process:
[0014] After cracking the coal seam with high-pressure fluid in a known way, inject high-temperature nitrogen (N 2 ) or high-temperature flue gas, stewing the well for 10 days, using high-temperature gas to heat the coal seam, so that the small molecules of nitrogen can react with coal molecules, and fully replace the coal seam gap and the coal seam gas in the molecular cluster.
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Abstract
The invention discloses a novel method for exploiting coal-bed gas. The method comprises the following steps: after breaking the coal bed by the known method using high pressure fluids, injecting high-temperature nitrogen gas (N2) with a temperature not less than 400 to 600 DEG C or high-temperature flue gas into a gas intake well; and standing for 7 to 15 days under sealed conditions to heat the coal bed with the high-temperature gas such that the small molecules of nitrogen gas can react with coal molecules to completely replace the coal-bed gas in the gaps and the molecular clusters of the coal bed. The coal bed is heated by the high-temperature gas to accelerate the penetration of the gas in the gaps of the coal bed and increase the desorption speed of the coal-bed gas, so that the yield of the coal-bed gas is increased.
Description
technical field [0001] The invention relates to a method for increasing the production of coalbed methane mining, in particular to utilizing high-temperature nitrogen (N 2 ) or a method for mining coalbed methane with fracturing fluid at a certain temperature, belonging to the technical field of coalbed methane mining methods. Background technique [0002] Coalbed methane is natural gas formed during coal formation and still stored in coal seams, the main component of which is methane (CH 4 ). It is a kind of unconventional natural gas, which is self-generated and stored in coal seams in the form of adsorption, including adsorbed gas on the matrix surface, free gas in coal seam cracks and cleats, dissolved gas in coal seam water, and free gas in interlayers between coal seams, etc. 4 parts. Coalbed methane is a high-quality energy and chemical raw material, and it is a good supplementary energy in the current energy shortage environment. [0003] my country's coalbed met...
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IPC IPC(8): E21B43/24E21B43/267
Inventor 王正东宁丽华
Owner 王正东
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