A negative pressure detection device and detection method for borehole gas drainage
A technology of gas extraction and detection device, which is applied in mining devices, earthwork drilling, gas discharge and other directions, can solve the problems of limited length of manual feeding negative pressure detection pipe, inability to detect negative pressure in drilling and extraction, etc. fixed effect
Active Publication Date: 2022-04-08
HUAINAN MINING IND GRP +1
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Problems solved by technology
[0003] However, at present, the negative pressure of gas drainage at the bottom of the borehole is mostly detected by manually feeding the negative pressure detection tube. Since some boreholes are curved, the length of the manual negative pressure detection tube is extremely limited. , especially when encountering a soft coal seam, the negative pressure in the borehole can only be measured within 20m. Compared with the design distance of hundreds of meters or even hundreds of meters in the general gas drainage borehole, this distance can provide limited reference. , which still has a large gap with the actual demand on the mine, and it is impossible to detect the negative pressure of extraction in deep boreholes
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[0031] In order to facilitate those skilled in the art to understand the technical solution of the present invention, the technical solution of the present invention will be further described in conjunction with the accompanying drawings.
[0032] In this application, terms such as "installation", "connection", "connection" and "fixation" should be interpreted in a broad sense, for example, it can be a fixed connection or a detachable connection, unless otherwise clearly specified and limited. , or integrated; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection or an indirect connection through an intermediary, it can be the internal communication of two components or the interaction relationship between two components . Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.
[0033] In this application, unless otherwise clearly ...
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The invention discloses a borehole gas extraction negative pressure detection device and detection method, comprising a hollow drill pipe connected to a drilling rig, a detection pipe, a delivery pipe, a support structure and a pressure pipe, and the detection pipe is arranged inside the hollow drill pipe , the end of the detection tube extending into the hollow drill rod is connected to the delivery tube, the delivery tube is provided with a support mechanism capable of fixing the delivery tube on the inner arm of the borehole, and one end of the pressure tube is set on the The outside of the detection tube, the other end extends into the detection tube and is connected with the support mechanism on the delivery tube. The invention has the advantages of ensuring the detection depth of the detection tube, effectively avoiding the problem that the negative pressure in the hole cannot be detected due to the collapse of the hole during the drilling process, and combined with the setting of the support structure, preventing the hollow drill rod push rod At this time, the detection tube is driven out of the borehole to ensure that the detection tube can be stably fixed in the borehole, and the negative pressure detection of the entire borehole section is realized to meet the negative pressure detection requirements of the borehole.
Description
technical field [0001] The invention relates to the technical field of gas drainage negative pressure detection, in particular to a borehole gas drainage negative pressure detection device and detection method. Background technique [0002] With the rapid development of coal mining technology in my country, coal seam gas disasters have become an important factor restricting the development of efficient and intensive mining technology and the needs of safe production. Conventional or single gas disaster prevention and control technology can no longer meet the needs of efficient and safe production in coal mines. Drainage is the most effective way to prevent gas disasters. At present, many coal mines in China do not have good gas drainage effect by bedding drilling. Negative pressure is an important factor affecting the effect of gas drainage. Only when negative pressure is formed inside the borehole, the gas desorbed from the coal seam can flow into the drainage pipeline unde...
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IPC IPC(8): E21F17/18E21F17/00E21F7/00E21B47/00
CPCE21F17/18E21F17/00E21F7/00E21B47/00
Inventor 刘超余国锋段昌瑞
Owner HUAINAN MINING IND GRP