A Method for Measuring the Initial Velocity of Borehole Gas Eruption
A gas gushing volume and gas gushing technology, which is applied in the field of measuring the initial velocity of gas gushing in drilling holes, can solve the problems of inaccuracy, the measurement process of the initial velocity of gas gushing in drilling holes is cumbersome, and the operation is difficult, so as to achieve accurate data, The effect of reducing the probability of serious accidents and improving safety
Active Publication Date: 2018-09-21
CHINA UNIV OF MINING & TECH +1
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Problems solved by technology
[0006] Technical problem: the purpose of the present invention is to overcome the deficiencies in the prior art, and propose a method for measuring the initial velocity of gas gushing from boreholes, so as to solve the cumbersome process of measuring the initial velocity of gas gushing from boreholes, difficult operation, and inaccuracy The problem
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Embodiment Construction
[0027] An embodiment of the present invention will be further described below in conjunction with the accompanying drawings:
[0028] The method for measuring the initial velocity of gas emission from a borehole of the present invention includes the use of a drilling rig 1, a hollow drill pipe 6 and a gas emission tester 2. The gas emission tester 2 is equipped with an air flow meter and a pressure sensor, and The gas concentration sensor 3 is connected externally. The method for measuring the initial gas emission velocity: in the coal body 7, first use the drilling rig 1 and the hollow drill rod 6 to drill into the coal body, and then measure the air volume Q passed by the gas emission tester 2 , Pressure P and the gas concentration n of the mixed gas at the exit of the borehole, and use mathematical formulas to calculate the gas emission per unit time and the initial velocity of gas emission from the borehole.
[0029] The specific steps of measuring the initial velocity of gas e...
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The invention discloses a method for measuring the initial emission velocity of gas from a drill hole and relates to the field of coal mine safety. The method comprises the following steps: firstly drilling into a coal body with a drilling machine and a hollow drill rod, stopping drilling for 1 minute when the drilled depth is 1m smaller than a predetermined depth, reading data, and then continuing drilling to the predetermined depth. The quantity Q and the pressure P of air entering the drill hole and the concentration n of the gas on the inner side of an outlet of the drill hole are measured by a gas emission quantity tester; then emission rate of the gas from the drill hole within a unit time and the initial emission velocity of the gas can be calculated according to a mathematical formula. Compared with the prior art, the method has the advantages that the operation is simple and reliable, the interference to normal production is small, the probability of outburst accident occurrence is favorably reduced, and the coal mine safety is improved.
Description
Technical field [0001] The invention relates to the field of coal mine safety, in particular to a method for measuring the initial velocity of gas emission from a borehole. Background technique [0002] The initial velocity of gas emission from a borehole is one of the important indicators for predicting the risk of coal seam outburst. It refers to the hole sealing immediately after drilling is completed to determine the maximum amount of gas emitted in the enclosed section. The principle is based on outburst coal and The difference between non-outburst coal in gas desorption volume and desorption speed, outburst coal has a large gas desorption volume, the initial gas desorption speed is fast, and the desorption volume decays quickly with time. [0003] The initial velocity of gas emission from the borehole depends on the coal seam gas content, coal seam gas pressure, coal destruction degree, physical and mechanical properties and other factors, that is, it almost reflects all the ...
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IPC IPC(8): E21B47/00E21B47/06
CPCE21B47/00
Inventor 贾慧霖王恩元
Owner CHINA UNIV OF MINING & TECH