Multi-coal seam gas pressure measuring device and measuring method in single drill hole
A technology of gas pressure and measurement devices, which is applied in the directions of measurement, earthwork drilling, wellbore/well components, etc., which can solve the problems of long measurement period, high cost, complicated operation process, etc., and achieve the reduction of labor intensity and simple measurement process , the effect of saving measurement time
Pending Publication Date: 2018-11-16
CHINA UNIV OF MINING & TECH (BEIJING)
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[0004] The purpose of the present invention is to provide a multi-coal seam gas pressure measurement device and method in a single borehole t
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[0021] The present invention will be described in detail below in conjunction with the accompanying drawings and the embodiment of measuring 2 layers of coal:
[0022] A multi-coal seam gas pressure measuring device and method in a single borehole, comprising a pressure measuring tube 1, a wire mesh cover 2, a pressure measuring gauge 3, a pressure gauge 4, a sealing capsule 5, a tee 6, an inflation tube 7, and an air pump 8 It is composed of a check valve 10, a pressure measuring hole 9 is punched at the top of the pressure measuring tube 1 and is connected to the wire mesh cover 2, and the bottom end is connected to a pressure measuring gauge 3. Pipe 7, the bottom end of the inflation pipe 7 is connected to the stop valve 10 and then connected to the tee 6, and the other end of the tee 6 is connected to the pressure gauge 4 and the pump 8.
[0023] The gas pressure measurement method described in this embodiment is carried out in the following steps:
[0024] Step 1: Use a ...
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The invention relates to a multi-coal seam gas pressure measuring device and measuring method in a single drill hole. The multi-coal seam gas pressure measuring device in the single drill hole consists of pressure measuring tubes, a barbed wire cover, pressure measuring instruments, pressure gauges, sealing capsules, tee joints, inflation tubes, inflators and a gas stopping valve. The multi-coal seam gas pressure measuring method in the single drill hole comprises the following steps that coal seams to be measured are drilled a hole by a drilling rig, and the number of groups of the pressure measuring tube is determined according to the number of layers of the coal seams to be measured; distance between the coal seam and the coal seam and between the coal seam and an orifice is determinedaccording to the composition of drill cuttings, and the length of each group of the pressure measuring tube and the location of sealing capsules are further determined according to the composition ofthe drill cuttings; the pressure measuring tubes are sealed in the sealing capsules, and a pressure measuring device is assembled completely; the drill hole is flushed, the assembled pressure measuring device is inserted into the drill hole, and the drill hole is sealed by the sealing capsules; and when the pressure measuring instruments reading is stable, gas pressure value of each coal seam is directly read through the pressure measuring instruments, and thus measuring of the gas pressure of multiple coal seams in one drill hole is realized. The multi-coal seam gas pressure measuring deviceand measuring method in the single drill hole solves the problem that only one coal seam can be measured in one drill hole in a traditional measuring process, and has simple operation, low cost and strong practicability.
Description
technical field [0001] The invention belongs to the field of gas disaster prevention and control, and in particular relates to a gas pressure measuring device and method for multiple coal seams in a single borehole. Background technique [0002] Coal seam gas is one of the main factors affecting the safety of coal mine production and one of the main causes of underground accidents in coal mines. With the continuous increase of mining depth, coal and gas outburst dynamic disasters also increase. The measurement of coal seam gas pressure is of great significance for the prevention of coal and gas dynamic disasters and the corresponding disaster prevention and control work. In addition, the measurement of coal seam gas pressure is also an important basis for evaluating coal seam gas reserves, gas emission, and gas flow. [0003] At present, in the measurement of coal seam gas pressure, only one layer of coal gas pressure can be measured in one borehole. When mining multi-layer...
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Login to view more IPC IPC(8): E21B47/06
CPCE21B47/06
Inventor 解北京董春阳严正
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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