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Gas pressure observation system for downhole drilling of water-bearing coal and rock

A gas pressure and observation system technology, applied in gas discharge, measurement, drainage and other directions, can solve problems such as water accumulation in downhole boreholes, and achieve the effect of continuous and accurate measurement and reduction of impact

Inactive Publication Date: 2016-10-12
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when the formation structure and roadway layout do not allow the construction of horizontal drilling and upward drilling, it is necessary to use downward drilling, and the traditional method cannot effectively solve the problem of water accumulation in the downward drilling

Method used

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  • Gas pressure observation system for downhole drilling of water-bearing coal and rock
  • Gas pressure observation system for downhole drilling of water-bearing coal and rock
  • Gas pressure observation system for downhole drilling of water-bearing coal and rock

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In the present invention, the method for measuring the gas pressure observation system of downhole drilling in water-bearing coal rocks specifically includes the following steps:

[0036] (1) Drilling: use conventional coal mine drilling equipment to drill downhole 1 to the coal seam in the coal rock roadway, and the hole is deep enough to pass through the coal seam for a certain distance;

[0037] (2) Install the water-permeable device: clean up the sundries in the borehole, install the water-permeable device 4 in the borehole, fill the gap between the water-permeable device 4 and the borehole 1 with filling materials, and perform a pressure test after curing for a certain period of time , if the experiment is unsuccessful, reinstall the permeable device 4;

[0038] (3) Closed drilling: After the pressure test is successful, install the relevant pipelines on the baffle, use the baffle to form 2 No. 1 sealed chambers 2 and 1 No. 2 sealed chamber 3, and first use the curin...

Embodiment 2

[0043] The difference from Example 1 is that the drilling drainage method in step (5) is different, and another drainage method is to discharge water under the condition of pressure difference, that is, first use the air supply pipeline 11 to perform a little pressure relief, so that the upper and lower cavities are formed. pressure difference, and then use the pressure difference to permeate the water. After the permeation is completed, the oil pipeline 10 is depressurized, the piston 6 moves under the pressure of the spring, and the permeable hole is closed by the piston, so that the permeable device 4 is in a sealed state; Water is sealed under water permeable device 4, if the water yield is more, then utilize high-pressure air tank 20 to press high-pressure gas through air supply pipe 11, water can be discharged by drainage pipe 9 or water is extracted out by drainage motor 19.

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Abstract

The invention provides a gas pressure observation system for a downstream drill hole in an aqueous coal rock and belongs to the technical field of mine gas pressure measurement. The gas pressure observation system specifically solves the problem that the measurement and determination of the gas pressure in the downstream drill hole are failed due to water logging. The gas pressure observation system comprises a permeable device, a plugging device and a pressure measurement device, the permeable device is mounted in the drill hole and used for discharging water from the drill hole; the plugging device is used for closing the drill hole; the pressure measurement device is used for measuring the gas pressure in the downstream drill hole. The gas pressure observation system is capable of better overcoming the influence of water on the gas pressure measurement in the downstream drill hole, and is especially suitable for measuring the gas pressure in the downstream drill hole in the aqueous coal rock. Due to the adoption of the electronic devices, the periodic record, storage and transfer of gas pressure data is conducted automatically, so that the times that the data are recorded manually are reduced.

Description

technical field [0001] The invention belongs to the technical field of mine gas pressure measurement, and in particular relates to a water-bearing coal rock gas pressure observation system. Background technique [0002] Gas pressure is an important parameter that marks the gas occurrence state in coal seams. It is a key basic parameter in the study of mine coal and gas outburst, gas gushing, and gas drainage. Therefore, it is necessary to measure the coal seam gas pressure in order to study the occurrence and gushing laws of coal seam gas. 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, usually at the level of the coal seam or lower than the coal seam. The roadway is used as the layout location of the drilling site, so that the drilled holes are all horizontal or upward dril...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/06E21B47/26E21B33/13E21F16/00E21F7/00
CPCE21B33/13E21B47/06E21B47/26E21F7/00E21F16/00
Inventor 刘伟韬宋文成申建军刘士亮穆殿瑞谢祥祥张茂鹏吕斌宰慧董文程赵春波刘超范龙邱磊
Owner SHANDONG UNIV OF SCI & TECH
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