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Measuring method of gas pressure observation system for downhole drilling in water-bearing coal rock

A gas pressure and observation system technology, which is applied in surveying, earthwork drilling, wellbore/well components, etc., can solve problems such as water accumulation in downhole drilling, and achieve continuous and accurate measurement and reduce impact.

Inactive Publication Date: 2017-05-03
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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  • Measuring method of gas pressure observation system for downhole drilling in water-bearing coal rock
  • Measuring method of gas pressure observation system for downhole drilling in water-bearing coal rock
  • Measuring method of gas pressure observation system for downhole drilling in water-bearing coal rock

Examples

Experimental program
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Effect test

Embodiment 1

[0040] In the present invention, the method for measuring gas pressure observation system for downhole drilling in water-bearing coal rock specifically includes the following steps:

[0041] (1) Drilling holes: Use conventional coal mine drilling equipment to drill down drill holes 1 in the coal rock roadway to the coal seam, the hole is deep to a certain distance through the coal seam;

[0042] (2) Water-permeable device: clean the debris in the borehole, install the water-permeable device 4 in the borehole, fill the pores between the water-permeable device 4 and the borehole 1 with the filling material, and do a pressure test after curing for a certain period of time , If the experiment is unsuccessful, reinstall the permeable device 4;

[0043] (3) Sealing the borehole: After the pressure test is successful, install the relevant pipes on the baffle, use the baffle to form 2 No. 1 sealed chambers 2 and 1 No. 2 sealed chamber 3, first use the curing material pressure tank 16 to cure...

Embodiment 2

[0048] The difference from Example 1 is that the drilling drainage method in step (5) is different. Another drainage method is to drain under the pressure difference condition, that is, first use the air supply pipe 11 to perform a little pressure relief to form the upper and lower cavities. The pressure difference is then used to permeate the water. After the water permeation is completed, the pressure of the oil pipeline 10 is relieved, 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; if the amount of water is small, then The water is sealed under the permeable device 4, and if the amount of water is large, the high-pressure gas tank 20 is used to press in the high-pressure gas through the air supply pipe 11, and the water can be discharged through the drainage pipe 9 or pumped out through the drainage motor 19.

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Abstract

The invention provides a method for measuring the gas pressure observation system of a water-bearing coal rock downhole drilling, belonging to the technical field of mine gas pressure measurement. It specifically solves the problem that the gas pressure cannot be measured due to accumulated water in the downhole. It first drills the hole, and then prepares the experimental hardware. The experimental hardware includes a water permeable device, a plugging device and a pressure measuring device; Water-permeable device, and fill the gap between the water-permeable device and the borehole with filling materials, and after curing, conduct a pressure test for testing; then close the borehole for a second pressure test, and discharge the water in the borehole; finally pass Related auxiliary equipment for gas pressure measurement. The invention can better overcome the influence of water in the downhole drilling on the measurement of the gas pressure, and is especially suitable for the measurement of the gas pressure in the downhole drilling of water-bearing coal rocks.

Description

Technical field [0001] The invention belongs to the technical field of mine gas pressure measurement, and specifically relates to a measurement method of a water-bearing coal and rock gas pressure observation system. Background technique [0002] Gas pressure is an important parameter that marks the occurrence of coal seam gas. It is a key basic parameter when studying coal and gas outburst, gas emission, and gas drainage. Therefore, in order to study the law of coal seam gas occurrence and emission, it is necessary to measure coal seam gas pressure. According to the coal industry standard MT / T638-1996 "Method for Direct Measurement of Gas Pressure in Coal Seams in Coal Mines", the pressure test drill site should be selected in the roadway adjacent to the coal seam. Under normal circumstances, it is usually selected to be level or lower than the coal seam. The roadway is used as the location of the drill site, so that the boreholes constructed are all horizontal or upward boreho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B47/06
CPCE21B47/06
Inventor 刘伟韬宋文成申建军张晓强张茂鹏谢祥祥刘士亮吕斌董文程宰慧赵春波刘超范龙邱磊
Owner SHANDONG UNIV OF SCI & TECH
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