CN101089368A - Detection method for deep of gas exhaust hole - Google Patents
Detection method for deep of gas exhaust hole Download PDFInfo
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- CN101089368A CN101089368A CNA2007100622974A CN200710062297A CN101089368A CN 101089368 A CN101089368 A CN 101089368A CN A2007100622974 A CNA2007100622974 A CN A2007100622974A CN 200710062297 A CN200710062297 A CN 200710062297A CN 101089368 A CN101089368 A CN 101089368A
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Abstract
The present invention discloses a detection method of gas exhaust hole depth, belonging to the field of coal mine gas exhaust technology. Said method includes the following steps: pressing the compressed air into the gas exhaust hole, using flowmeter to determine the volume of gas injected into the gas exhaust hole under the standard condition; after the air pressure is reached to balanced state, adopting pressure sensor to determine balanced-pressure of flow field in the gas exhaust hole interior, then according to the state equation of gas determining volume of gas exhaust hole, and utilizing diameter of said gas exhaust hole to calculate and define the depth of said gas exhaust hole.
Description
Technical field
The present invention relates to the gas discharge in mine technology, particularly a kind of method that deep of gas exhaust hole is detected.
Background technology
The China's coal-mine overwhelming majority is Jing Gongkuangjing, the geological conditions complexity, and the disaster type is many, and it is wide to distribute, and mining conditions is the poorest in each main producing coal country of the world, disaster is the most serious.In the state-owned emphasis colliery, highly gassy mine accounts for 21.0%; Coal and gas outburst mine accounts for 21.3%; Low gaseous mine accounts for 57.7%.In local state-owned colliery and the Township Coal Mine, high gas and coal and gas outburst mine account for 15%.And along with the increase of mining depth, the increase of gas emission, the ratio of high gas and coal and gas outburst mine also can increase.Thereby gas accident becomes first of the crowd evil of coal mining.2005, in the accident more than once dead 3 people in national colliery, 158 of gas accidents accounted for 58.9%, occupied first.For this reason, country when formulating 11th Five-Year colliery development outline, established " take out afterwards earlier adopt, monitoring, with the wind fixed output quota " the control of coalmine gas working policy.Have only through behind the gas pumping, gas bearing capacity is reduced to and allows exploitation below the mark, can implement exploitation.Therefore, the pre-extraction of gas becomes the very important step of coal mining." take out afterwards earlier and adopt " is exactly that the gas in the coal seam (coal bed gas) is extracted utilization before working seam, its meaning is the coal bed gas resource of preciousness is made full use of, and has guaranteed that simultaneously gas emission reduces the safety that ensures in the manufacturing process significantly in the seam mining process.And the main means of extraction coal bed gas are by in advance in coal seam or adjacent layer, arrange a series of boring, extract by vacuum pump then and compose the gas that exists in the coal seam.Therefore, the quality of boring is the key that determines to take out in advance the coal bed gas effect.In advance drilling quality is detected undoubtedly to guaranteeing that it is very important extracting efficient out.
Detect the degree of depth of gas extraction hole in time, quickly and easily, for guaranteeing that the gas drainage under suction effect has very important significance.Present definite drill personnel's report and record of footman personnel of only relying on to deep of gas exhaust hole.Owing to can't the degree of depth of gas extraction hole be detected accurately, often cause the difference of reporting drilling depth and actual grade very big, brought very large hidden danger for the Safety of Coal Mine Production in later stage.The projected depth of gas extraction hole approaches the length of work plane, general dark reaching more than 100 meters.Gas extraction hole has that the degree of depth is big, axis has certain curvature (not being straight line), hole wall is because the effect of geostatic stress often causes characteristics such as local slump.Owing to can not guarantee that in boring procedure straight line creeps into, the absolute altitude at the bottom of aperture and the hole differs greatly, and therefore, adopts common ripple survey method and flash spotting can't the deep of gas exhaust hole of axis bending be detected accurately.By retrieval, also find no the relevant instrument that is suitable at present.
Summary of the invention
The objective of the invention is to overcome above-mentioned gas extraction hole can't survey the shortcoming that method and laser method fathom with conventional mechanical method, ripple, and a kind of detection method of deep of gas exhaust hole is provided.It adopts runny gas to detect the volume in gas hole, thereby can be big to the degree of depth easily and accurately, the degree of depth of the gas extraction hole of axis bending carries out scene detection.
The present invention solves the core of the technical scheme that its technical problem takes, and is to adopt compressed air to be pressed into gas extraction hole, and measures the volume of gas under standard state that injects in the gas extraction hole with flow meter; After air pressure reached equilibrium state, adopts pressure sensor was measured the equilibrium pressure of gas extraction hole flow field; Determine the volume of gas extraction hole then according to the state equation of gas, thereby calculate definite its degree of depth according to the diameter of gas extraction hole.
A kind of concrete steps of detection method of deep of gas exhaust hole are:
(1) is connected with tested aperture with compressed air source with the gas transmission conduit that contains pressure meter, thermometer, flow meter, and in gas extraction hole, arranges at least two pressure sensors, temperature pick up, seal orifice then apart from aperture diverse location place;
(2) injecting compressed air in the hole is measured the initial pressure P of gas simultaneously respectively by pressure meter, thermometer, flow meter
1, temperature T
1And volume V
1
(3) when the pressure reading of all pressure sensors equates, stop gas injection, measure the pressure P of gas in the hole
2And the temperature T in the hole
2Calculate the volume V of gas extraction hole by the state equation of gas
2
(4) directly measure the diameter D of gas extraction hole, get its average, by the volume V of gas extraction hole
2Calculate the degree of depth L of gas extraction hole.
The state equation of described gas is: PV=nRT
In the formula: the molal quantity of n-perfect gas, the pressure of P-gas, the volume of V-gas, T-absolute temperature, R-gas constant.
The volume V of described gas extraction hole
2Design formulas be: V
2=P
1V
1T
2/ (T
1P
2) in the formula: P
2The pressure of gas in the-hole, T
2The temperature of gas in the-hole, P
1-initial pressure, V
1-initial volume, T
1-initial temperature.
The design formulas of the degree of depth L of described gas extraction hole is: L=4V
2/ (3.14D
2) in the formula: V
2The volume of-gas extraction hole, D-are directly measured the average diameter of gas extraction hole.
The present invention is owing to inject runny compressed air in gas extraction hole, and can determine the volume of gas extraction hole according to the state equation of gas, and then calculates the degree of depth of determining gas extraction hole according to the diameter of direct measurement gas extraction hole.Therefore, solve prior art and can't carry out the on-the-spot technical barrier that detects the degree of depth by gas extraction hole big to the degree of depth, axis bending.The detection method of deep of gas exhaust hole provided by the invention is provided with pressure sensor, temperature pick up in the hole, it is accurate, reliable not only to detect, and easy, easy row.For implementing " take out afterwards earlier and adopt " control of coalmine gas working policy that national 11th Five-Year colliery development outline is established, provide a kind of method that detects deep of gas exhaust hole in time, fast, easily.
The present invention is further illustrated below by preferred embodiment.
The specific embodiment
A kind of detection method of deep of gas exhaust hole, the concrete steps of its enforcement are as follows:
(1) is connected with tested aperture with compressed air source with the gas transmission conduit that contains pressure meter, thermometer, flow meter, and in gas extraction hole, arrange two (also can lay 3～4) pressure sensors, temperature pick up, seal orifice then according to actual conditions apart from aperture diverse location place;
(2) compressed air gas injection in the hole of employing air compressor or down-hole.Measure the initial pressure P of gas simultaneously respectively by pressure meter, thermometer, flow meter
1, temperature T
1And volume V
1
(3) when the pressure reading of two pressure sensors equates, stop gas injection, measure the pressure P of gas in the hole
2, temperature T
2, the state equation by gas calculates the volume V of gas extraction hole
2
(4) diameter of directly measuring gas extraction hole is got its average D, by the volume V of gas extraction hole
2Calculate the degree of depth L of gas extraction hole.
Little at pressure, under the not too high also not too low situation of temperature, the behavior of all gases all is tending towards perfect gas.The Ideal-Gas Equation (ideal gas, equation of state of) is the equation of gaseous state Changing Pattern of idealizing.Quality is the perfect gas of M, and the functional relation between its state parameter pressure P, volume V and the absolute temperature T is
PV＝nRT (1)
In the formula: n is the mole molal quantity of perfect gas; R is a gas constant, is generally: 8.31 J/mol.
Can calculate the molal quantity n that injects gas in the gas extraction hole according to (1) formula, design formulas is as follows:
n＝PV/(RT) (2)
Because R is a gas constant, therefore,
P
1V
1/T
1＝P
2V
2/?T
2 (3)
Can obtain the volume V of gas extraction hole by (3) formula
2:
V
2＝P
1V
1T
2/(T
1P
2) (4)
Because the diameter of gas extraction hole changes in the hole not quite, can directly measure, suppose that measuring the gained diameter is D, the degree of depth L that then can calculate gas extraction hole is:
L＝4V
2/(3.14D
2) (5)
Claims (4)
1, a kind of detection method of deep of gas exhaust hole is characterized in that the concrete steps of detection method are:
(1) is connected with tested aperture with compressed air source with the gas transmission conduit that contains pressure meter, thermometer, flow meter, and in gas extraction hole, arranges at least two pressure sensors, temperature pick up, seal orifice then apart from aperture diverse location place;
(2) injecting compressed air in the hole goes out the initial pressure P of gas simultaneously by pressure meter, thermometer, flow measurement
1, temperature T
1And volume V
1
(3) when the pressure reading of all pressure sensors equates, stop gas injection, measure the pressure P of gas in the hole
2And the temperature T in the hole
2Calculate the volume V of gas extraction hole by the air state equation
2
(4) directly measure the diameter D of gas extraction hole, by the volume V of gas extraction hole
2Calculate the degree of depth L of gas extraction hole.
2, according to the detection method of the described deep of gas exhaust hole of claim 1, it is characterized in that: described air state equation is: PV=nRT
In the formula: the molal quantity of n-perfect gas, the pressure of P-gas, the volume of V-gas, T-absolute temperature, R-gas constant.
3, according to the detection method of the described deep of gas exhaust hole of claim 1, it is characterized in that: the volume V of described gas extraction hole
2Design formulas be: V
2=P
1V
1T
2/ (T
1P
2)
In the formula: P
2The pressure of gas in the-hole, T
2The temperature of gas in the-hole, P
1-initial pressure, V
1-initial volume, T
1-initial temperature.
4, according to the detection method of the described deep of gas exhaust hole of claim 1, it is characterized in that: the design formulas of the degree of depth L of described gas extraction hole is: L=4V
2/ (3.14D
2)
In the formula: V
2The volume of-gas extraction hole, D-are directly measured the average diameter of gas extraction hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100622974A CN101089368A (en) | 2007-07-12 | 2007-07-12 | Detection method for deep of gas exhaust hole |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100622974A CN101089368A (en) | 2007-07-12 | 2007-07-12 | Detection method for deep of gas exhaust hole |
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| CN101089368A true CN101089368A (en) | 2007-12-19 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102031959A (en) * | 2010-12-03 | 2011-04-27 | 永贵能源开发有限责任公司 | Inspection method and device for gas drainage hole |
| CN102269606A (en) * | 2011-06-29 | 2011-12-07 | 中广核工程有限公司 | Method for monitoring flow rate of radioactive gas exhaust flow of nuclear power plant |
| CN102562033A (en) * | 2012-02-21 | 2012-07-11 | 重庆大学 | Method for testing gas drainage drill hole depth through microseismic positioning |
| CN101824999B (en) * | 2009-03-04 | 2013-02-20 | 中矿龙科能源科技(北京)股份有限公司 | Technology for measuring gas pressure of coal bed by utilizing through beds hole |
| CN105221179A (en) * | 2015-10-21 | 2016-01-06 | 太原理工大学 | A kind of highly gassy mine Y type method of ventilation |
| CN109356653A (en) * | 2018-11-01 | 2019-02-19 | 云南昆钢电子信息科技有限公司 | A kind of drop shaft depth measurement device and method |
| CN109707371A (en) * | 2018-11-19 | 2019-05-03 | 太原理工大学 | A kind of quickly measurement coal bed drilling depth mechanism and method |
| CN114483003A (en) * | 2020-10-26 | 2022-05-13 | 中国石油化工股份有限公司 | Dynamic liquid level measuring method and wellhead measuring equipment for dynamic liquid level measuring method |
-
2007
- 2007-07-12 CN CNA2007100622974A patent/CN101089368A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101824999B (en) * | 2009-03-04 | 2013-02-20 | 中矿龙科能源科技(北京)股份有限公司 | Technology for measuring gas pressure of coal bed by utilizing through beds hole |
| CN102031959A (en) * | 2010-12-03 | 2011-04-27 | 永贵能源开发有限责任公司 | Inspection method and device for gas drainage hole |
| CN102269606A (en) * | 2011-06-29 | 2011-12-07 | 中广核工程有限公司 | Method for monitoring flow rate of radioactive gas exhaust flow of nuclear power plant |
| CN102562033A (en) * | 2012-02-21 | 2012-07-11 | 重庆大学 | Method for testing gas drainage drill hole depth through microseismic positioning |
| CN102562033B (en) * | 2012-02-21 | 2015-10-07 | 重庆大学 | The method of testing gas drainage drill hole depth through microseismic positioning |
| CN105221179A (en) * | 2015-10-21 | 2016-01-06 | 太原理工大学 | A kind of highly gassy mine Y type method of ventilation |
| CN105221179B (en) * | 2015-10-21 | 2017-10-31 | 太原理工大学 | A kind of highly gassy mine Y type method of ventilations |
| CN109356653A (en) * | 2018-11-01 | 2019-02-19 | 云南昆钢电子信息科技有限公司 | A kind of drop shaft depth measurement device and method |
| CN109356653B (en) * | 2018-11-01 | 2023-10-24 | 云南昆钢电子信息科技有限公司 | Drop shaft depth measuring device and method |
| CN109707371A (en) * | 2018-11-19 | 2019-05-03 | 太原理工大学 | A kind of quickly measurement coal bed drilling depth mechanism and method |
| CN109707371B (en) * | 2018-11-19 | 2022-08-02 | 太原理工大学 | Device and method for rapidly measuring drilling depth of coal seam |
| CN114483003A (en) * | 2020-10-26 | 2022-05-13 | 中国石油化工股份有限公司 | Dynamic liquid level measuring method and wellhead measuring equipment for dynamic liquid level measuring method |
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