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Coal gas freezing sampler for air drilling

A sampler and gas technology, which is used in the preparation of test samples, earthwork drilling, wellbore/well components, etc., can solve the problems of long coal seam core sampling time and cumbersome operation process, so as to reduce the loss of coal gas, Simple operation and simple structure effect

Active Publication Date: 2017-06-13
CHONGQING UNIV
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  • Abstract
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Problems solved by technology

[0004] However, the operation process of this patent is loaded down with trivial details, and the sampling time of coal seam core is longer

Method used

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  • Coal gas freezing sampler for air drilling

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Embodiment Construction

[0016] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0017] like figure 1 As shown, the present invention includes a vacuum insulation layer formed by welding and closing the inner wall of the shell 6, the inner tank 7 and the cooling jacket 11, the liquid nitrogen storage chamber formed by the inner cavity of the inner tank 7, and the inner wall of the cooling jacket 11 and the conical core tube 12. The freezer chamber formed by the outer wall and the end cover 14, and the thermal insulation sampling chamber formed by the inner cavity of the conical core pipe 12; the upper joint 3 of the sampler is sealed on the top port of the shell 6, and the lower port of the upper joint 1 of the drill pipe is threaded on the sampler On the upper joint 3, the drill pipe 5 is sheathed on the periphery of the outer shell 6, and the upper end of the drill pipe 5 is threaded to the lower part of the upper joint 1 of the drill p...

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Abstract

The invention discloses a coal gas freezing sampler for air drilling and belongs to the technical field of mine safety protection. The sampler comprises a vacuum insulating layer formed by hermetically welding an inner wall of a housing (6) and a liner (7) and a cooling gasket (11), a liquid nitrogen storage chamber formed by an inner cavity of the liner, a freezing chamber formed by the inner wall of the cooling jacket (11), the outer wall of a cone-shaped rock core tube (12) and an end cover (14), an insulating sampling chamber formed by the inner cavity of the cone-shaped rock core tube (12) and a closed water container formed by a piston (13) and the cone-shaped rock core tube (12). The sampler disclosed by the invention has the beneficial effects that the problem that the freezing and sampling effect is relatively poor as the water content of a coal sample in an air drilling process is low is effectively solved by means of a method of pre-storing water in the closed water container, and liquid nitrogen in the liquid nitrogen storage chamber is automatically released into the freezing chamber through a second one-way valve to moisturize and freeze a coal sample, so that the sampler is simple to operate and short in sampling time.

Description

technical field [0001] The invention belongs to the technical field of coal mine safety protection, and in particular relates to a coal gas freezing sampler, which is suitable for fixed-point sampling of gas-containing coal in the coal field development process. Background technique [0002] Accurate acquisition of coal seam gas parameters is crucial to gas outburst prevention and control. Coal gas sampling technology is a key technical means to evaluate gas pressure and content. At present, the determination of coal seam gas mainly adopts the direct measurement method based on sampling technology, but the existing sampling technology has problems such as large gas loss due to the exposure of gas to the air, which makes it impossible to accurately measure the pressure and content of coal seam gas. Make high gas mine exist " low index " outstanding danger. [0003] Chinese patent document CN 106124243 A disclosed a coal seam gas content determination advanced freezing sampl...

Claims

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Application Information

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IPC IPC(8): G01N1/42E21B49/08
CPCE21B49/088G01N1/42
Inventor 罗永江梁运培胡千庭彭枧明何将福李波
Owner CHONGQING UNIV
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