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Pressure-maintaining airtight coal sample collecting device and method

A collection device and coal sample technology, which is applied in safety devices, mining equipment, earth cube drilling, etc., can solve the problems of sampling result distortion, affecting the measurement accuracy of gas content, and inaccurate measurement, so as to improve accuracy, easy maintenance, Avoid the effect of escape

Active Publication Date: 2018-09-18
HENAN POLYTECHNIC UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Existing sampling methods for gas content testing in underground coal mines have formed drilling cuttings sampling method, casing sampling method, rope sampling method, compressed air sampling method and other technologies. The results are obviously distorted, resulting in inaccurate gas loss measurement and affecting the accuracy of gas content measurement

Method used

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  • Pressure-maintaining airtight coal sample collecting device and method
  • Pressure-maintaining airtight coal sample collecting device and method
  • Pressure-maintaining airtight coal sample collecting device and method

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Embodiment Construction

[0024] In order to make the purpose, technical solutions and beneficial effects of the present invention more clear, the following will further describe the implementation of the present invention in detail in conjunction with the accompanying drawings.

[0025] Such as figure 1 As shown, a pressure-holding airtight coal sample collection device according to the present invention is composed of a double-channel high-pressure water braid 1, a double-channel sealing drill pipe 2, a pressure-holding airtight sampler 3, and a drill bit 4 connected sequentially by taper threads. Composition, such as figure 2 As shown, the pressure-holding airtight sampler 3 includes a housing 301, along the axial direction of the housing 301, a plurality of sampling windows 302 are arranged side by side, and the housing 301 is fixedly connected with a seal for blocking the sampling windows 302. Bead 303, one end of housing 301 is provided with internal taper thread joint 4, the other end of housi...

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Abstract

The invention relates to a pressure-maintaining airtight coal sample collecting device and method. Compared with an existing coal mine coal sample collecting device, coal sample collecting is conducted in a closed environment, the escape of gas in a coal sample is avoided, and therefore the gas content of the coal sample is obtained by calculating the sum of the coal sample on-site gas desorptionamount and the coal sample residual gas desorption amount measured in a laboratory; the coal sample collecting device is simple in operation, high in applicability, simple and convenient to maintain,safe and efficient; the coal sample is collected during drilling of a drilling stem, it can be ensured that the coal sample is in an airtight state in the collecting process, the gas loss in the coalsample is avoided, and the coal mine downhole gas content measuring accuracy is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of underground gas content testing in coal mines, and in particular relates to a pressure-maintained sealed coal sample collection device and a collection method. Background technique [0002] Before the start of gas drainage treatment, it is necessary to collect coal samples for gas content testing to provide guidance for the design of gas drainage engineering; after the gas drainage treatment is completed, it is also necessary to conduct a gas residual content test to verify whether the gas drainage effect meets the relevant specifications Require. [0003] Gas content testing methods include direct method and indirect method. The indirect method calculates the gas content of the coal seam based on the original gas pressure of the coal seam measured underground, the porosity of the coal sample, the adsorption constant and other parameters. This method can truly reflect the original gas content of the coal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/02E21B10/02E21F7/00
CPCE21B10/02E21B49/02E21F7/00
Inventor 苏现波裴刚宋金星
Owner HENAN POLYTECHNIC UNIV
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