Observation system used for ascending drilling gas pressure of mine soft coal rock

Abstract

The invention discloses an observation system used for ascending drilling gas pressure of mine coal rock, comprising a detecting and receiving device, a plugging device and a testing apparatus, wherein the detecting and receiving device is arranged in a borehole, the tail part of the detecting and receiving device is connected with the plugging device; the detecting and receiving device comprises a main pipe, a detecting pipe, a rubber soft ball, a baffle and a U-shaped baffle; the detecting pipe is arranged at the front part of the main pipe and can swing with small angle in a certain range; a plurality of extracting holes are formed in the front part of the detecting pipe, the tail of the detecting pipe is a spherical capsule, circular holes for gas to flow out are distributed in the surface of the spherical capsule; the baffle and the rubber soft ball are sequentially arranged at the tail part of the detecting pipe; the baffle is located at one side close to the spherical capsule; and the U-shaped baffle is inversely buckled at the front part of the detecting pipe. The system can well overcome the influence of the prior art that gas parameters cannot be further tested because an ascending borehole of the soft coal rock is easy to collapse, is especially applicable to testing on gas parameters in the ascending borehole of the soft coal rock, and can ensure accurate testing on gas extraction of the soft coal rock and the gas parameters.

Description

technical field [0001] The invention belongs to the technical field of measuring gas parameters in mines, and in particular relates to an observation system for gas pressure in upward drilling of soft coal and rock in mines. Background technique [0002] Gas pressure and gas content are important parameters to indicate the state of coal seam gas occurrence. It is a key basic parameter when studying mine gas control, coal and gas outburst, gas gushing, and gas drainage. Determination of gas content. According to the provisions of the coal industry standard MT / T638-1996 "Direct Measurement Method of Coal Seam Gas Pressure in Underground Coal Mine", the pressure measurement drilling site should be selected in the roadway adjacent to the coal seam, and generally the upward drilling should be drilled in the complete and hard coal rock If the measurement is drilled in soft coal rocks, the drill hole will easily collapse, and the gas measurement hole will be buried, making it imp...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an observation system for the gas pressure in the upward drilling of soft coal rocks in mines. The observation system can solve the problems that the upward drilling in soft coal rocks is easy to collapse and affects the measurement of gas parameters.

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