Quick measurement method of coal seam gas pressure

A coal seam gas pressure and rapid measurement technology, applied in drilling equipment and methods, measurement, earthwork drilling and mining, etc., can solve problems such as hidden dangers of accidents, wrong technical judgments, etc., to reduce gas leakage, take a long time to solve, and reduce crack water gushing effect

Inactive Publication Date: 2015-03-04
ANHUI UNIVERSITY OF ARCHITECTURE +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This will lead to wrong technical judgments

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  • Quick measurement method of coal seam gas pressure
  • Quick measurement method of coal seam gas pressure
  • Quick measurement method of coal seam gas pressure

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Embodiment Construction

[0025] see figure 1 , figure 2 and image 3 , the rapid measurement method of coal seam gas pressure in the present embodiment is to operate according to the following process:

[0026] Step 1: Use the drill pipe in the roadway 12 to drill into the coal rock mass 1 until it reaches the level of the coal seam 7 to form a large-diameter borehole 4, take out the drill pipe and run the casing 5 into the large-diameter borehole 4 to the hole At the bottom, two grouting pipes 14 are lowered at the same time, and an annular cavity is formed between the casing 5 and the large-diameter borehole 4, and the grouting pipe 14 is located in the annular cavity; the casing 5 is a steel pipe with a diameter of 108 mm, and the The tail is welded with a flange.

[0027] Step 2, use fast-drying cement or polyurethane to seal the large-diameter borehole 4 at the orifice to form a seal 15; then use the high-pressure hose 16 to connect the grouting pipe 14 with the high-pressure grouting pump 10...

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Abstract

The invention discloses a quick measurement method of coal seam gas pressure. The method is characterized in that the measurement operation of measuring the drilling pressure is divided into two phases: the first phase is to perform the large-diameter drilling in the pressure measuring position, a bushing is put in the large-diameter drill hole, and slurry is injected in the bushing, the large-diameter drilling hole and a surrounding rock microfissure zone for compacting; and the second phase is to perform the drilling again in the bushing to form a pressure measuring hole penetrating in a coal seam, a drill rod is taken out, and the coal seam gas pressure is directly measured by an original bushing. The slurry is injected in a fissure group of a coal rock body surrounding the drilling hole, the drilling hole and the bushing under the effect of high pressure, so that the peripheral compactness of the drilling hole is improved, the emission of fissure water in a rock stratum is largely reduced, the air leakage and the water yield in the drilling hole are obviously reduced; and in particular, aiming at a soft coal measure strata, the coal seam gas pressure is quickly and accurately measured.

Description

technical field [0001] The invention relates to a method for rapidly measuring gas pressure in coal seams, more specifically to a method for measuring gas pressure in low-permeability coal seams of coal mines by drilling holes through layers in rock masses. Background technique [0002] Mine gas accident is one of the most serious natural disasters in coal mines. Coal seam gas pressure is the driving force of gas gushing and outburst, a sign of the gas content in coal body, and a main parameter of the danger of coal and gas outburst. Accurate measurement of coal seam gas pressure is of great significance to effective and reasonable formulation of gas prevention measures and prediction of coal and gas outburst risks. [0003] At present, the measurement of coal seam gas pressure at home and abroad is to drill holes from the rock roadway to the coal seam. The sealing methods in the pressure measurement process include yellow mud or cement mortar sealing, polyurethane sealing, ...

Claims

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Application Information

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IPC IPC(8): E21B47/06E21B7/20E21B33/13
CPCE21B47/06E21B7/20E21B33/13
Inventor 卢平李平姚尚文夏抗生余陶陈健
Owner ANHUI UNIVERSITY OF ARCHITECTURE
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