Method for pumping coalbed gas by heating coal bed
A technology for coal bed methane and coal seam, which is applied in the field of coal bed methane extraction by using group wells to connect and heat coal seams, can solve the problems of difficult industrial production and application, difficult separation technology, etc., achieve effective coal bed methane extraction, speed up desorption, The effect of increasing the extraction rate and extraction speed
Active Publication Date: 2012-01-25
TAIYUAN UNIV OF TECH
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Problems solved by technology
At present, due to the immaturity of rapid and efficient gas separation technology, especially the difficulty of separation technology for carbon dioxide and methane gas, it is difficult to realize the application of this technology in industrial production
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[0032] figure 1 , figure 2 The layout diagram of the ground vertical drilling well pattern of the present invention is given. As shown in the figure, select a suitable well spacing of 500m on the ground, determine the well location, implement vertical drilling into the coal seam, and arrange the well pattern. The well pattern consists of five wells including one heat source injection well 1 and four gas production wells 2 .
[0033] After the vertical drilling enters the coal seam 6, the screen casing 4 is lowered in the coal seam section, and the thermal insulation casing 3 is lowered in the 5th section of the overlying strata on the coal seam roof above the coal seam, and cementing is carried out according to the specification requirements.
[0034] After all the wells are completed and cemented, at least one heat source injection well 1 is selected, and the rest are gas production wells 2 . According to the size of the coal seam permeability, it is determined whether th...
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Provided is a method for heating coal seam and extracting coal seam gas. Firstly, a plurality of vertical wells are drilled from the ground to the coal seam, after the drilled well reached to the coal seam, the coal seam is inserted with a screen tube casing (4), the section above the coal seam is inserted with a heat insulation casing (31) and the well is correspondingly fixed. At least one wellof the wells is selected to be a heat source injection well (1) and other wells are gas production wells (2), steam with high temperature and high pressure is injected into the heat source injection well (1) to perform fracturing to communicate all the wells in the network. Drainage and pressure reduction are performed to the gas production wells (2) to extract the mixed gas of the coal seam gas and steam. The mixed gas of the coal seam gas and steam is cooled by known cooling method so as to obtain gaseous coal seam gas and liquid distilled water to realize the separation of the mixed gas. According to the change of the coal seam temperature, the heat source injection well (1) and the gas production wells (2) are allocated to control the heated coal seam and extract coal seam gas. The method of he invention can effectively perform the extraction of the coal seam gas, accelerate the coal seam extraction speed, and improve the extraction rate.
Description
technical field [0001] The invention relates to an underground coal-bed gas mining method, in particular to a method for extracting coal-bed gas by using group wells to connect and heat coal seams. Background technique [0002] Coalbed methane is an associated gas of coal, the main component is methane, commonly known as "gas" in coal mines. Because coalbed methane can be burned, it is exploited and utilized as a clean energy. Known main drainage methods at present include: the underground coal seam drilling drainage method in the coal mine roadway and the multi-branch horizontal well drainage technology implemented on the ground. The underground coal seam drilling and drainage technology is a technology for drilling from the underground roadway of the coal mine to the coal seam and performing drainage. The technology is mainly to reduce the coalbed gas content in the coal seam and ensure the safe production of the coal mine. The multi-branch horizontal well drainage tech...
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IPC IPC(8): E21B43/24E21F7/00
Inventor 冯增朝赵阳升吕兆兴杨栋刘静波赵东
Owner TAIYUAN UNIV OF TECH