Method for measuring pressure of gas in coal seam in fracture rock stratum

A coal seam gas pressure and measurement method technology, applied in drilling equipment and methods, measurement, earthwork drilling and mining, etc., can solve the problems of poor pressure bearing effect of drilling holes, unfavorable high-pressure grouting, unsuitability, etc., and achieve enhanced hole sealing Quality, strong applicability, and the effect of avoiding crack problems

Inactive Publication Date: 2015-04-29
YONGCHENG COAL & ELECTRICITY HLDG GRP
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Problems solved by technology

Although this method can achieve a certain effect, the pressure bearing effect of the borehole is poor, which is not conducive to high-pressure grouting. It is easy to cause the solidified slurry to collide with the borehole wall due to the inf

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  • Method for measuring pressure of gas in coal seam in fracture rock stratum

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Embodiment Construction

[0011] The present invention will be further described in conjunction with the accompanying drawings.

[0012] as attached figure 1 As shown, the method for measuring coal seam gas pressure in fractured rock formations includes the following steps: (1) Drilling a 6m-long hole with a diameter of 133mm for pressure measurement; (2) inserting a 6m long hole with a diameter of 108mm After sealing the orifice pipe 7, use cement slurry to fill the outer space of the orifice pipe 7 and solidify the pipe; (3) After 48 hours of solidification, inject water into the orifice pipe 7 for pressure test, and the test pressure shall not be less than 6MPa, stable for 10 minutes without water leakage is qualified, otherwise re-grouting; (4) After the solid pipe is qualified, use a drill bit with a diameter of 89mm to sweep the hole along the orifice pipe 7 to the mudstone of the coal seam floor (drill the down hole to the coal seam roof) Stop the construction (the length of the rock hole is no...

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Abstract

The invention discloses a method for measuring pressure of gas in a coal seam in a fracture rock stratum. The method comprises the following steps of firstly, penetrating the seam, measuring the pressure, drilling and tapping to form an outer rock drill hole; after sleeving a borehole orifice-pipe, fixing the pipe and passing the pressure-tight test, continuously going deep into the drill hole to form an inner rock drill hole, then secondary grouting and solidifying the inner rock drill hole; sweeping the hole and drilling along the borehole orifice-pipe again, forming a coal drill hole after coal can be seen from the drill hole, inserting a pressure measuring pipe into the inner rock drill hole, and utilizing expanded synthetic resin to coordinate with a grout stop belt to block two ends of the inner rock drill hole of the drill hole to form a closed chamber; after grouting is performed for the third time in the closed chamber, mounting a pressure gage and observing for 20-30d and recording. Through drilling and grouting processes for multiple times, tight hole sealing and multilayer high-pressure grouting, as well as the functions of thoroughly blocking circumferential cracks of rocks, enhancing hole sealing quality and separating gas in the hole are realized. The method is strong in applicability, and can be adopted no matter how complex the geological conditions are.

Description

technical field [0001] The invention relates to the technical field of coal gas pressure measurement, in particular to a method for measuring coal gas pressure in a fractured rock formation. Background technique [0002] Coal seam gas pressure is an important index to evaluate whether a coal seam has outburst risk, but the coal seam gas pressure is affected by different measurement methods and different geological conditions, and the real coal seam gas pressure is difficult to be effectively measured. When measuring coal seam gas pressure by drilling through layers, if the formation fractures are developed or the hole sealing technology is backward, it is easy to cause a large amount of gas overflow in the drilling hole in actual measurement, which is the main reason for the distortion of the pressure display. [0003] Coal seam gas pressure measurement can be divided into active pressure measurement method and passive pressure measurement method according to differe...

Claims

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Application Information

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IPC IPC(8): E21B47/06E21B33/13E21B7/00
CPCE21B47/06E21B7/00E21B33/13
Inventor 白克新陈宇魏永建王义民郄利敏
Owner YONGCHENG COAL & ELECTRICITY HLDG GRP
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