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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AI-Extracted Technical Summary

Problems solved by technology

[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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Abstract

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.

Application Domain

Survey

Technology Topic

Drill cuttingsDrill hole +6

Image

  • Multi-coal seam gas pressure measuring device and measuring method in single drill hole
  • Multi-coal seam gas pressure measuring device and measuring method in single drill hole

Examples

  • Experimental program(1)

Example Embodiment

[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 drilling machine to drill a drill hole 12 with a diameter of 95mm into the coal seam 11, and the drill hole 12 passes through the two coal seams 11 to be measured;
[0025] Step 2: flush the borehole 12, and clean the cinder and rock slag in the borehole 12;
[0026] Step 3: Determine the specific data of the thickness of the coal seam 11, the distance between the coal seam 11, and the distance between the coal seam 11 and the orifice according to the situation of the drill cuttings flowing out when the borehole 12 is drilled. The distance determines the length of the two sets of pressure measuring tubes 1. The top of the pressure measuring tube 1 connected to the wire mesh cover 2 is inserted into the bottom of the coal seam for 0.5m, and the first sealing capsule 5 is sealed and wrapped on the longer pressure measuring tube 1. The lower part of the farther coal seam floor is connected to the inflatable pipe 7, and the second sealing capsule 5 is sealed and wrapped around the two sets of pressure measuring tubes 1 and the inflatable pipe 7 of the first sealing capsule 5, and is located in the coal seam closer to the orifice. The lower part of the bottom plate is connected with the inflatable tube 7, and the two groups of pressure measuring tubes 1 and the inflatable tube 7 are connected and extended to the outside of the orifice, and the measuring device is assembled;
[0027] Step 4: Use the air pump 8 to pump air into the two sealing capsules 5 respectively, until the pressure gauge 4 reads the sealing pressure value, stop pumping, open the air stop valve 10, and the sealing is completed at this time;
[0028] Step 5: When the readings of the two pressure gauges 3 are stable and no longer change, read and record the data of the pressure gauges 3. The data at this time can be used to calculate the accurate coal seam gas pressure;
[0029] Step 6: After the measurement is completed, close the air stop valve 10, deflate the air-sealing capsule 5, arrange the recycling equipment, and wait for the next use.
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Description & Claims & Application Information

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