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Method and device for testing length of water column in drilling hole for measuring gas pressure

A gas pressure and testing device technology, applied in gas discharge, mining devices, safety devices, etc., can solve the problems of uncontrollable gas and water release, complicated operation, error deviation, etc., to improve the accuracy of hydraulic testing, ingenious process, eliminate effect of error

Active Publication Date: 2019-01-18
CCTEG SHENYANG RES INST
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0008] In order to solve the above problems, the present invention proposes a gas pressure measurement method for measuring the length of the water column in a borehole, which solves the problems of complicated operation, serious error deviation, and uncontrollable release of gas and water in the previous drilling procedure for measuring the length of the water column in a borehole. The water column height under the premise of the system is an indirect, fast and accurate test method, and the water column pressure is obtained directly through the test system, and then the real gas pressure of the coal seam is corrected

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  • Method and device for testing length of water column in drilling hole for measuring gas pressure
  • Method and device for testing length of water column in drilling hole for measuring gas pressure

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Embodiment 1

[0044] Such as Figure 1-Figure 3 As shown, this embodiment proposes a gas pressure measuring device for measuring the length of water column in a borehole, including a pressure measuring steel pipe 5, a stainless steel wire 10, an insulating sleeve 15, a DC power supply with readable current and variable output voltage, a rheostat box and a precision pressure gauge. Table 1, wherein the front section of the steel pipe has a number of distributed holes, so that the front section of the steel pipe forms a pressure measuring flower tube 13, the center of the pressure measuring steel pipe 5 has a built-in stainless steel wire 10, and the pressure measuring steel pipe 5 and the stainless steel wire 10 are arranged at intervals, and the pressure measurement The end face between the front end of the steel pipe 5 and the front end of the stainless steel wire 10 is sealed by an insulating sleeve 15; The total pressure of the gas and liquid in the piezometer borehole; the first electro...

Embodiment 2

[0054] The present embodiment proposes the test method for measuring the length of the water column in the borehole by gas pressure, and uses the test device for measuring the length of the water column in the borehole by the gas pressure proposed in Example 1, including the following steps:

[0055] Step 1. Construct the oblique pressure measurement borehole 8 at the predetermined position underground and enter the target coal seam 14, and use the compressed air system or high-pressure water to flush the residual debris in the hole, and wait for the hole to be sealed for pressure measurement;

[0056] Step 2. Insert the pressure measuring flower pipe 13 into the pressure measuring borehole 8, the length of the front section of the pressure measuring flower pipe 13 from the bottom of the pressure measuring borehole 8 is less than 1m, and seal the pressure measuring steel pipe 5 in the coal rock body, Form the sealing section 7;

[0057] Step 3. Open the three-way valve 2 to re...

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Abstract

The invention relates to an underground gas pressure testing technology, in particular to a device for testing the length of a water column in drilling a hole for measuring the gas pressure, wherein apipe wall of the front section of a steel pipe is provided with a plurality of distributed holes so that a pressure-measuring embossing pipe is formed at the front section of the steel pipe, a stainless steel wire is arranged in the center of the pressure-measuring steel pipe, the pressure-measuring steel pipe and the stainless steel wire are spaced, and the end surface between the front end of the pressure-measuring steel pipe and the front end of the stainless steel wire is sealed by an insulating sleeve; the tail end of the pressure-measuring steel pipe is sealed, a precision pressure gauge is arranged at the tail end of the pressure-measuring steel pipe, and the pressure-measuring steel pipe is used for detecting the total pressure of gas and liquid in a pressure measuring drilling hole; a first electrode of a direct current power supply is connected with the pressure measuring steel pipe through a test wire through and a variable resistance box, and a second electrode is connected with the stainless steel wire through the test wire. According to the invention, the method accurately corrects the water pressure of a water-containing drilling hole. The device and the operation of the method are simple, the calculation is accurate, and the testing circulation is extremely short. Gas over limit or impact accident caused by a prior technology are avoided.

Description

technical field [0001] The invention relates to an underground gas pressure testing technology, in particular to an accurate measurement and correction technology for directly measuring coal seam gas pressure in an underground coal mine. Background technique [0002] Coal seam gas pressure is an important basic parameter for evaluating the risk of coal and gas outburst, checking the compliance of gas drainage and predicting the risk of coal seam gas disasters. Accurate measurement of coal seam gas pressure is a necessary link before safe mining operations in mines. [0003] At present, the measurement of coal seam gas pressure is carried out according to the safety production industry standard of the People's Republic of China - "Direct Measurement Method of Coal Seam Gas Pressure in Underground Coal Mine-AQ / T1047-2007". A certain length of water column is often accumulated, especially for upward pressure measurement drilling, the static pressure generated by the water colum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F17/18E21F7/00
Inventor 苏伟伟王春光王耀峰李杰李艳增黄鹤马金魁石永生许幸福郭怀广薛伟超邹永洺李豪君
Owner CCTEG SHENYANG RES INST
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