CN105735967A - Method for measuring initial emission velocity of gas from drill hole - Google Patents
Method for measuring initial emission velocity of gas from drill hole Download PDFInfo
- Publication number
- CN105735967A CN105735967A CN201610225920.2A CN201610225920A CN105735967A CN 105735967 A CN105735967 A CN 105735967A CN 201610225920 A CN201610225920 A CN 201610225920A CN 105735967 A CN105735967 A CN 105735967A
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- 238000000034 method Methods 0.000 title abstract description 11
- 239000003245 coal Substances 0.000 claims abstract description 34
- 238000005553 drilling Methods 0.000 claims abstract description 27
- 238000000691 measurement method Methods 0.000 claims description 8
- 238000013178 mathematical model Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000003795 desorption Methods 0.000 description 5
- 238000007789 sealing Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000205 computational method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Geophysics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
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
The present invention relates to field of coal mine safety, specifically a kind of drilling gas is gushed out the measuring method of initial velocity.
Background technology
Drilling gas initial velocity of gushing out is one of important indicator of prediction Coal Seam Outburst Hazard, it refers to after end of drilling, carry out sealing of hole at once, measure the maximum gas amount gushed out in closed section, its principle is the difference in desorption of mash gas amount and desorption rate based on prominent coal and non-protruding coal, prominent coal desorption of mash gas amount is big, and initial desorption of mash gas speed is fast, and the desorption quantity rate of decay in time is also fast.
The gush out size of initial velocity of drilling gas depends on the factors such as coal seam gas-bearing capacity, coal-bed gas pressure, the destructiveness of coal, physico-mechanical properties, namely it almost reflects the whole factors determining Coal Seam Outburst Hazard, it is the important indicator predicting coal and gas prominent danger or outburst prevention measures validity check for underground coal mine work surface, is draw through long-term research and test through domestic and international vast coal science and technology personnel.
The current on-the-spot drilling gas adopted is gushed out muzzle velocity measurement method: electricity consumption coal borer or wind coal borer drive auger stem, creep in coal seam42mm holes, and often creeps into 1m or creeps into desired depth, exits drilling rod, sends into hole packer, inflates sealing of hole with inflator, the gas flow that after then measuring, with effusion meter, end of drilling, during 2min, specific length is holed.
The method has problems: field conduct operation easier of getting up is relatively big, and often creeping into 1m needs to be repeated once and move back brill, sealing of hole, meter reading, send drilling rod again, and process is very loaded down with trivial details.This operating process often be can not be completed in 2min simultaneously, and artifical influence factor is more, gushing out the accuracy that initial velocity measures so that affecting drilling gas, thus affecting the evaluation that work surface coal and gas prominent is dangerous, bringing potential safety hazard and security threat to coal production.
Summary of the invention
Technical problem: the invention aims to overcome weak point of the prior art, it is proposed to a kind of drilling gas is gushed out muzzle velocity measurement method, loaded down with trivial details to solve current drilling gas muzzle velocity measurement process of gushing out, operation easier is big, inaccurate problem.
Technical scheme: the drilling gas of the present invention is gushed out muzzle velocity measurement method, adopt rig, hollow drill and Gas tester, at Gas tester built with air mass flow device and pressure transducer, and being circumscribed with gas concentration sensor, the step of muzzle velocity measurement method is as follows:
A., underground pressure air accesses the porch of Gas tester, and air out accesses rig through air-quantity adjusting valve and pipeline afterwards from the outlet of Gas tester, by pipeline and hollow drill, and finally discharges in boring at drill bit place；
B. gas concentration sensor is placed near boring exit, and pressure transducer output is accessed in Gas tester；
C. utilize rig and hollow drill to drill in coal body, routinely deslagging and pressure wind resource assessment, when creeping into 1m before desired depth, stop creeping into 1 minute, keep rig to continue idle running deslagging and pressure wind resource assessment；
D. time by Gas tester, actual measured amount enters the gas density n inside the intake volume Q of boring, pressure P and aperture, utilizes mathematical model unit of account time drilling gas outburst amount；
In formula:
QEmptyEquivalence air quantity；
The surveyed air quantity of Q sensor；
P sensor institute measuring pressure；
The surveyed gas density of n sensor；
P0Atmospheric pressure；
CH in a coal bed gas composition4Accounting, if coal seam gushes out, gas is all CH4, then a takes 1；
QWattPure gas emission in hole.
E. continue to creep into forward 1m after desired depth, repeat step d, obtain pure gas emission Q ' in holeWatt, Q 'WattWith QWattDifference is the gas inrush initial velocity of boring.
Gas density n can be made to be in the optimum range calculating gas emission by controlling the intake of air-quantity adjusting valve.
Beneficial effect: the present invention utilizes rig and hollow drill to drill in coal body, before often creeping into 1m or creeping into desired depth during 1m, stops creeping into 1min, but rig continues idle running deslagging and continues with pressure wind resource assessment.There are air mass flow and pressure transducer in Gas tester, and there is the function of external gas concentration sensor, measure now by Gas tester and enter the intake volume Q of boring, pressure P and boring outlet inner side gas density n.Utilizing mathematical formulae unit of account time drilling gas outburst amount and gas inrush initial velocity, wherein gas inrush initial velocity is equal to the difference of twice drilling gas outburst amount of continuous print in a boring.Compared with prior art, need not stop to bore, move back the processes such as drilling rod, sealing of hole and artificial meter reading, simple to operate, can realize automatically recording continuously Gas relevant parameter, data are accurate, speed and the precision of projecting coal bed drift face prominent Predicting Gas are greatly improved, reduce the probability that prominent accident occurs, improve the safety of mine.Its advantage: can automatically record gas emission continuously, the precision measuring gas inrush initial velocity is high, and speed is fast, and normal production interference is little.There is wide applicability in the art.
Accompanying drawing explanation
Fig. 1 is the field conduct layout drawing of the present invention.
In figure, 1-rig；2-Gas tester；3-gas concentration sensor；4-presses wind entrance；5-volume damper；6-hollow drill；7-coal body.
Detailed description of the invention
Below in conjunction with accompanying drawing, one embodiment of the present of invention is further described:
The drilling gas of the present invention is gushed out muzzle velocity measurement method, including adopting rig 1, hollow drill 6 and Gas tester 2, described Gas tester 2 is built with air mass flow device and pressure transducer, and it is circumscribed with gas concentration sensor 3, this gas inrush initial velocity measuring method: in coal body 7, drill in coal body first with rig 1 and hollow drill 6, again through measuring the air quantity Q that Gas tester 2 passes through, the gas density n of pressure P and boring exit mixing gas, and utilize mathematical formulae unit of account time drilling gas outburst amount and drilling gas to gush out initial velocity.
The concrete steps that gas inrush initial velocity is measured:
1. underground pressure air is accessed entrance 4 place of Gas tester 2, air out accesses rig through air-quantity adjusting valve 5 and pipeline from the outlet of Gas tester 2 afterwards, by pipeline and hollow drill 6, and finally discharge in boring at drill bit place, in air-flow direction such as accompanying drawing shown in dotted line；
2. gas concentration sensor 3 is placed near boring exit, and sensor output is accessed in Gas tester 2, as shown in drawings；
3., in coal body 7, utilize rig 1 and hollow drill 6 to drill in coal body, now control valve 5, make air quantity be adjusted to maximum, when creeping into 1m before desired depth, stop creeping into 1 minute, but rig continues idle running deslagging and continues with pressure wind resource assessment；
4. utilize Gas tester 2 to measure the air quantity Q, the absolute pressure P that pass through and the mixed gas gas density n of outlet, now by control valve 5 so that gas density n is in the optimum range calculating gas emission；
5. calculate according to following formula and show the interior pure gas emission that portals in Gas tester 2；
In formula:
QEmptyEquivalence air quantity；
The surveyed air quantity of Q sensor；
P sensor institute measuring pressure；
The surveyed gas density of n sensor；
P0Atmospheric pressure；
CH in a coal bed gas composition4Accounting, if coal seam gushes out, gas is all CH4, then a takes 1；
QWattPure gas emission in hole.
6., after continuation creeps into desired depth forward, repeat step 4 and 5, obtain pure gas emission Q ' in holeWatt, Q 'WattWith QWattDifference is the gas inrush initial velocity of boring；
Above-described embodiment is only a kind of form of the present invention, the tester arrangement in implementing for reality, position, and signal transmission and computational methods do not have limited significance.
Claims (2)
1. a drilling gas is gushed out muzzle velocity measurement method, adopt rig (1), hollow drill (6) and Gas tester (2), at Gas tester (2) built with air mass flow device and pressure transducer, and it is circumscribed with gas concentration sensor (3), it is characterised in that:
A. underground pressure air is accessed entrance (4) place of Gas tester (2), air out accesses rig through air-quantity adjusting valve (5) and pipeline from the outlet of Gas tester (2) afterwards, by pipeline and hollow drill (6), and finally discharge in boring at drill bit place；
B. gas concentration sensor (3) is placed near boring exit, and pressure transducer output is accessed in Gas tester (2)；
C. utilize rig (1) and hollow drill (6) to drill in coal body, routinely deslagging and pressure wind resource assessment, when creeping into 1m before desired depth, stop creeping into 1 minute, keep rig to continue idle running deslagging and pressure wind resource assessment；
D. time by Gas tester (2), actual measured amount enters the gas density n inside the intake volume Q of boring, pressure P and aperture, utilizes mathematical model unit of account time drilling gas outburst amount；
In formula:
QEmptyEquivalence air quantity；
The surveyed air quantity of Q sensor；
P sensor institute measuring pressure；
The surveyed gas density of n sensor；
P0Atmospheric pressure；
CH in a coal bed gas composition4Accounting, if coal seam gushes out, gas is all CH4, then a takes 1；
QWattPure gas emission in hole.
E. continue to creep into forward 1m after desired depth, repeat step d, obtain pure gas emission Q ' in holeWatt, Q 'WattWith QWattDifference is the gas inrush initial velocity of boring.
2. a kind of drilling gas according to claim 1 is gushed out muzzle velocity measurement method, it is characterised in that: gas density n can be made to be in the optimum range calculating gas emission by controlling the intake of air-quantity adjusting valve (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610225920.2A CN105735967B (en) | 2016-04-12 | 2016-04-12 | Method for measuring initial velocity of gas emission in drill hole |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610225920.2A CN105735967B (en) | 2016-04-12 | 2016-04-12 | Method for measuring initial velocity of gas emission in drill hole |
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| CN105735967A true CN105735967A (en) | 2016-07-06 |
| CN105735967B CN105735967B (en) | 2018-09-21 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106285626A (en) * | 2016-08-16 | 2017-01-04 | 中煤科工集团重庆研究院有限公司 | Gas inrush initial velocity measurement device |
| CN106568675A (en) * | 2016-10-17 | 2017-04-19 | 铜仁中能天然气有限公司 | Novel desorption pressure tester for shale gas |
| CN110219692A (en) * | 2019-06-18 | 2019-09-10 | 中煤科工集团重庆研究院有限公司 | Using coal bed drilling construct in the prominent main contral parameter of Gas data inversion method |
| CN111140283A (en) * | 2020-01-17 | 2020-05-12 | 河南理工大学 | Device and method for measuring initial gas emission speed with fixed hole sealing length |
| CN112546828A (en) * | 2020-11-05 | 2021-03-26 | 太原理工大学 | Hydrogen sulfide gas treatment device in coal face coal body |
| CN112588095A (en) * | 2020-11-05 | 2021-04-02 | 太原理工大学 | Application method of device for treating hydrogen sulfide gas in coal body of coal face |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106285626A (en) * | 2016-08-16 | 2017-01-04 | 中煤科工集团重庆研究院有限公司 | Gas inrush initial velocity measurement device |
| CN106568675A (en) * | 2016-10-17 | 2017-04-19 | 铜仁中能天然气有限公司 | Novel desorption pressure tester for shale gas |
| CN110219692A (en) * | 2019-06-18 | 2019-09-10 | 中煤科工集团重庆研究院有限公司 | Using coal bed drilling construct in the prominent main contral parameter of Gas data inversion method |
| CN111140283A (en) * | 2020-01-17 | 2020-05-12 | 河南理工大学 | Device and method for measuring initial gas emission speed with fixed hole sealing length |
| CN112546828A (en) * | 2020-11-05 | 2021-03-26 | 太原理工大学 | Hydrogen sulfide gas treatment device in coal face coal body |
| CN112588095A (en) * | 2020-11-05 | 2021-04-02 | 太原理工大学 | Application method of device for treating hydrogen sulfide gas in coal body of coal face |
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| CN105735967B (en) | 2018-09-21 |
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Effective date of registration: 20170622 Address after: 221116 Xuzhou University Road, Jiangsu, No. 1 Applicant after: China University of Mining & Technology Applicant after: The large Mine Safety Technology of Xuzhou chats and equipment research and development centre Address before: 221116 Research Institute, China University of Mining and Technology, Xuzhou University, Jiangsu, China, Applicant before: China University of Mining & Technology |
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