Double-sensor pressure gauge for underground coal-bed gas

Abstract

The invention discloses a double-sensor pressure gauge for underground coal-bed gas. A circuit board of a first detecting device and a circuit board of a second detecting device are fixed at the two ends of a bridge connection piece respectively. A detecting end cap of the first detecting device is arranged at the other end of a pipe body, a detecting end cap of the second detecting device is connected with an isolated terminal, one end of the isolated terminal is at least provided with two connecting ports to be connected with a transmission cable, output cables connected with the connecting ports are led out from the other end of the isolated terminal, and the output cables are connected with the circuit boards of the detecting devices respectively. Through the mode, the double-sensor pressure gauge is provided with at least two independent detecting units, when one detecting unit is damaged, the other detecting unit can keep normal working, the function of warm backup is achieved, and smooth and continuous discharging and mining are guaranteed; after one detecting unit is buried by coal ash, dinas and the like, the other detecting unit can work normally in a one way mode, a user is reminded to discharge dinas timely, timely returning to work of the pressure gauge is guaranteed, and the service life is prolonged.

Description

technical field [0001] The invention relates to the field of coal bed gas extraction, in particular to a double-sensor pressure gauge for underground coal bed gas. Background technique [0002] During the coalbed methane extraction process, the pressure gauge can measure multiple measured values ​​in the well, such as the pressure and temperature values ​​in the well. Based on these measured values, it is possible to better judge whether there is any abnormal phenomenon in the well, which is very important for the smooth extraction of coalbed methane. meaning. [0003] In the prior art, there is only one sensor in the pressure gauge, and the single-sensor pressure gauge has defects in its work. For example, the transmission steel cable is easy to break under long-term pressure friction, and it is easy to be damaged by fly ash, Buried by sand and gravel, it loses the function of measurement and reduces the service life. Contents of the invention [0004] The main technica...

AI Technical Summary

Problems solved by technology

[0004] The main technical problem to be solved by the present invention is to provide a dual-sensor pressure gauge for downhole coalbed methane, which can be equipped with two independent detection units in one pipe body, avoiding the problem that one detection unit is easily damaged and the pressure gauge cannot work normally. problems, and at the same time, it can realize the function that one measurement end is buried and the other measurement end continues to work

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