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Method for extracting coalbed gases from coal mines by upper and lower combination

A technology for coalbed methane and coal mines, which is applied in the field of coalbed methane combined upper and lower coal mine drainage, can solve problems such as poor gas drainage effect, and achieve the effects of reducing the number of moving houses, shortening the extraction time, and shortening the construction period.

Active Publication Date: 2011-06-22
山西蓝焰煤层气集团有限责任公司
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Problems solved by technology

[0004] In order to solve the problem of poor gas drainage effect of surface drilling and drilling in coal seams, the present invention provides a method for combined extraction of coalbed methane by surface drilling and downhole drilling

Method used

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  • Method for extracting coalbed gases from coal mines by upper and lower combination
  • Method for extracting coalbed gases from coal mines by upper and lower combination
  • Method for extracting coalbed gases from coal mines by upper and lower combination

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Embodiment Construction

[0016] Such as figure 1 , 2 Shown in , 3, utilize drilling rig to construct directional long boreholes 8,7 in the downhole, two boreholes are arranged vertically, then construct drainage wells 2,3,4 on the ground, make described drainage wells 2, 4 by precise positioning 3 and 4 pass through downhole directional long boreholes 8 and 7 respectively so that the borehole and the extraction well can be connected precisely. The directional long borehole 3 is effectively sealed, and then the construction area around the drainage wells 2, 3, and 4 (the dotted line in the figure) and the directional long boreholes 8, 7 are sealed on the ground using ground drilling and fracturing equipment and technology. All the coal seams in the construction area (dotted line in the figure) are fractured, so that the relatively small area produced by the fracturing of surface drainage drilling 2, 3, and 4 can be expanded to a larger area around the long borehole 3 area, thereby significantly incre...

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Abstract

The invention relates to coalbed gas mining technology, in particular to a method for extracting coalbed gases from coal mines by upper and lower combination. The method solves the problem of poor gas drainage effects through surface well drilling and hole drilling in the coalbed. The method comprises the following steps: constructing extraction drilled wells on the surface, constructing underground directional long drilled holes in the coalbed, crosslinking the fracture areas of the extraction drilled wells with the drainage areas of the underground directional long drilled holes, then effectively sealing the underground directional long drilled holes in the coalbed, then utilizing fracturing equipment on the surface to fracture the drainage areas drilled on the surface and the drainage areas of the long drilled holes in the coalbed via the extraction drilled wells and finally carrying out extraction. The method has the advantages of improving the extraction rate and efficiency of the coalbed gases and shortening the construction period of the coalbed gas extraction engineering.

Description

technical field [0001] The invention relates to a coalbed methane mining technology, in particular to a method for coal mine well upper and lower combined extraction of coalbed methane. Background technique [0002] Underground drilling drainage is one of the main measures to control coal mine gas and eliminate coal and gas outburst. Through drainage, the gas content in coal seams can be reduced, the amount of gas gushing out during mine mining can be reduced, and the risk of coal and gas outburst can be reduced. At present, there are two ways to deal with coalbed methane. One is to drill wells on the ground in coalfield areas with high concentration of gas, and then use water injection and fracturing to increase the cracks in the coal seam and discharge the gas, and then export the gas through well pipes; However, in many cases, only surface drilling is used to fracturing a limited range, the drilling volume is low, and the extraction time is long. Another way is to use a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21F7/00
Inventor 李国彪李海贵张海军付峻青王德璋
Owner 山西蓝焰煤层气集团有限责任公司
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