Double-plug piping method of heavy-caliber gas exhaust hole working sleeve

A gas pumping and large-diameter technology, which is applied in gas discharge, drilling equipment and methods, and earthwork drilling and production, can solve the problems of small load capacity of drilling rigs, large lateral pressure of empty pipes, long empty pipes, etc., and reduce risks The effect of reducing the internal and external pressure difference and increasing safety

Inactive Publication Date: 2012-10-10
NO 1 SURVEYING TEAM OF ANHUI CHARCOAL FIELD & GEOLOGY BUREAU +1
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Problems solved by technology

[0015] In order to solve the problems of too long empty pipe, excessive lateral pressure of the external mud on the empty pipe and too small load capacity of the drilling rig in the conventional buoyancy plug down pipe construction, the pr

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  • Double-plug piping method of heavy-caliber gas exhaust hole working sleeve
  • Double-plug piping method of heavy-caliber gas exhaust hole working sleeve
  • Double-plug piping method of heavy-caliber gas exhaust hole working sleeve

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Embodiment Construction

[0049] In order to further illustrate the technical solution of the present invention, the preferred embodiments of the present invention are described below in conjunction with examples, but it should be understood that these descriptions are only to further illustrate the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0050] Project overview: Drill hole 9 has a depth of 816m and a hole diameter of 790mm. It is designed to use a working casing with an outer diameter of 630mm and a thickness of 18mm. The material of the working casing is steel with a density of 7.8t / m 3 , the buoyancy plug 14 and the buoyancy valve 15 weigh 10 tons in total and have a total mass of 230 tons. According to engineering practice experience, the design safety length of the empty pipe of the working casing is 220m. The specific gravity of mud 8 is 1.15t / m 3 . like Figure 4 shown.

[0051] According to the known engineering situation,...

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Abstract

The invention provides a double-plug piping method of a heavy-caliber gas exhaust hole working sleeve. The method comprises the following steps of: preparing a buoyancy plug and a buoyancy valve; piping by a suspending method; welding the buoyancy plug; piping by a buoyancy plug piping method; welding the buoyancy valve; filling high-pressure gas in the region between the buoyancy plug and the buoyancy valve; continuously piping to the hole bottom by the buoyancy plug piping method; drilling and breaking the buoyancy valve to release the high-pressure gas; and piercing the buoyancy valve and the buoyancy plug; and cementing wells. According to the invention, the problem that the transverse pressure of exterior mud to a hollow pipe is too large during the buoyancy plug piping construction is solved, the danger of instability of a working sleeve is reduced, the buoyancy upper limit is increased in comparison with the conventional buoyancy plug method, and a drilling machine with less load capacity can be used for piping under the same condition.

Description

technical field [0001] The invention belongs to the technical field of drilling construction for coal gas extraction and drainage, and in particular relates to a method for lowering a working sleeve of a large-caliber gas extraction and drainage hole with double plugs. Background technique [0002] At present, high-gas mines usually use gas drainage holes to drain underground gas to the ground and make use of it. This gas control method has low comprehensive cost and good effect, so it has been more and more widely used. [0003] After the gas drainage hole is drilled to the target hole depth and reamed, the working casing needs to be lowered to keep the drilling stable, prevent groundwater from seeping into the working face, and ensure gas extraction rate and ventilation. [0004] As the depth and diameter of the gas extraction and drainage holes increase, the total mass of the working casing becomes larger and larger. Therefore, during the running process, a buoyancy plug ...

Claims

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Application Information

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IPC IPC(8): E21F7/00E21B7/20
Inventor 程桦余大有孙家应毕万顺吴松贵姚直书荣传新尹德占郑腾龙
Owner NO 1 SURVEYING TEAM OF ANHUI CHARCOAL FIELD & GEOLOGY BUREAU
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