CN107227954B - Three-zone rapid observation and analysis method for spontaneous combustion of coal in goaf - Google Patents
Three-zone rapid observation and analysis method for spontaneous combustion of coal in goaf Download PDFInfo
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- CN107227954B CN107227954B CN201710568366.2A CN201710568366A CN107227954B CN 107227954 B CN107227954 B CN 107227954B CN 201710568366 A CN201710568366 A CN 201710568366A CN 107227954 B CN107227954 B CN 107227954B
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- 239000003245 coal Substances 0.000 title claims abstract description 47
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 18
- 230000002269 spontaneous effect Effects 0.000 title claims abstract description 18
- 238000004458 analytical method Methods 0.000 title claims abstract description 14
- 238000005553 drilling Methods 0.000 claims abstract description 51
- 239000007789 gas Substances 0.000 claims abstract description 43
- 239000011435 rock Substances 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000001301 oxygen Substances 0.000 claims abstract description 5
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 5
- 238000004868 gas analysis Methods 0.000 claims abstract description 3
- 239000002184 metal Substances 0.000 claims description 16
- 230000005540 biological transmission Effects 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000009529 body temperature measurement Methods 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 4
- 238000000605 extraction Methods 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 abstract description 3
- 238000005065 mining Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
- E21B49/084—Obtaining fluid samples or testing fluids, in boreholes or wells with means for conveying samples through pipe to surface
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/16—Injection
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- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Molecular Biology (AREA)
- Biomedical Technology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Sampling And Sample Adjustment (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a goaf coal spontaneous combustion three-zone rapid observation and analysis method, which comprises the following steps: drilling a hole in the coal rock mass of the goaf at a position which is selected to be 30-50m away from the working surface in the direction of the strike, wherein the vertical height of the drilled hole is set at a position which is 1.5m away from the bottom plate on the coal wall, and the inclination angle is 3-5 degrees; when the drill rod enters 10m of the coal rock mass in the goaf, stopping drilling, measuring the temperature and taking gas; then repeating the process to continue drilling, measuring the temperature and taking gas when drilling for 10m, and ending drilling until the drill rod enters 50m inside the coal rock mass of the goaf or the oxygen concentration in the monitored gas is lower than 5%; and injecting the collected gas in the coal rock mass air bags around different depths into a gas chromatograph for gas analysis, and recording analysis data. The invention has the advantages of high measuring speed, flexible position measurement, convenient point arrangement, no need of personnel to enter a dangerous area, ensured safety of the testing personnel and saved cost.
Description
Technical Field
The invention relates to the field of judgment of spontaneous combustion dangerous areas of a coal mine goaf, in particular to a three-zone rapid observation and analysis method for spontaneous combustion of coal in a goaf.
Background
The coal spontaneous combustion fire disaster is one of five disasters faced in coal mine underground mining, and along with the continuous expansion of complexity and scale of coal mining conditions, the disaster degree of the coal spontaneous combustion fire disaster of the mine is increased, so that a large number of production working faces are closed by fire every year. The observation of three zones of spontaneous combustion of coal in a gob is a necessary way for dividing a dangerous area of spontaneous combustion of coal in the gob, and is a necessary condition of a spontaneous combustion prevention technology of coal in the gob. However, the conventional method using the pre-buried pipe has many disadvantages, and the pre-buried pipe causes the damage, the blockage and even the breakage of the pipeline when the top plate collapses; the pipeline laying cost and the cost of arranging the bundle pipe monitoring system are high; the measuring points are fixed and cannot be flexibly arranged; the observation period is long (more than 1 month); in special cases, personnel need to enter a dangerous area for detection, and the danger is high.
Disclosure of Invention
In order to solve the problems, the invention provides a three-zone rapid observation and analysis method for spontaneous combustion of coal in a goaf, the measurement speed is high, and the three-zone range of one goaf can be measured only in 3-5 days; the position measurement is flexible, the measurement points are convenient to arrange, and personnel do not need to enter a dangerous area, so that the safety of the testing personnel is ensured; the utilized instruments and equipment can be reused, and the cost is saved.
In order to achieve the purpose, the invention adopts the technical scheme that:
a goaf coal spontaneous combustion three-zone rapid observation and analysis method comprises the following steps:
connecting a drill bit with a first section of drill rod, connecting the tail end of the first drill rod with a drilling machine, starting the drilling machine, drilling a hole in the goaf coal rock mass at a position which is selected to be 30-50m away from a working surface in the direction of the strike, wherein the length of the drilled hole is 30-60m away from a sealing wall, the vertical height of the drilled hole is arranged at a position which is 1.5m away from a bottom plate of a coal wall, the inclination angle is 3-5 degrees, and drilling is carried out in the goaf along the direction; when the drill rod enters 10m of the coal rock mass in the goaf, stopping drilling, measuring the temperature and taking gas; then repeating the process to continue drilling, measuring the temperature and taking gas when drilling for 10m, and ending drilling until the drill rod enters 50m inside the coal rock mass of the goaf or the oxygen concentration in the monitored gas is lower than 5%; and injecting the collected gas in the coal rock mass air bags around different depths into a gas chromatograph for gas analysis, and recording analysis data.
When drilling, introducing clean water into the drill rod, washing drill cuttings through the drill bit, and discharging a mixed solution of the drill cuttings and water through a gap between the drill rod and the coal-rock mass; when the first section of drill rod is about to completely enter the coal rock body, the drilling machine is separated from the first section of drill rod, one end of the second section of drill rod is connected with the tail end of the first section of drill rod, then the tail end of the second section of drill rod is connected with the drilling machine, and drilling is continued.
And when the hole is drilled to a position of 10m in the goaf, stopping construction, sending the connected rubber tube to a position of 10m under the protection of a drill rod, pre-pumping for not less than 15min, collecting gas in the hole by using a negative pressure air pump, penetrating a temperature detection device, and measuring the temperature in the hole.
Wherein, the temperature measurement is completed through the following steps:
and when the drill rod enters 10m of the coal rock mass in the goaf, stopping drilling, separating the last drill rod from the drilling machine, loading the connected temperature sensor and the data transmission line into the metal threading hose, fixing the metal threading hose and the metal threading hose, sending the metal threading hose and the data transmission line to the drill bit along the center of the drill rod, recording data displayed by a temperature display instrument after the temperature is stable, and repeating the process to measure the temperature data of the coal rock mass around the positions of 20m, 30m, 40m and 50 m.
Wherein, the gas extraction is completed through the following steps:
after the temperature is measured, the temperature measuring device is taken out, the metal threading hose is sent to the drill bit along the center of the drill rod, the rear end of the gas taking pipeline is connected with a metal hose joint, the other end of the joint is connected with a section of PVC rubber pipe, the other side of the rubber pipe is connected with a gas sampling pump, and after the connection is finished, gas extraction is carried out; after air is pumped for 15 minutes, the air bag is connected to the rear end of the air sampling pump for air collection; after the gas is collected, the air bag is taken down to be sealed, the air bag is taken to the ground to measure the gas components, and the processes are repeated to obtain gas samples of the coal rock mass around the positions of 20m, 30m, 40m and 50 m.
Wherein, a rock drilling machine is adopted, and a D38/27 hollow drill rod is selected.
The invention has the following beneficial effects:
(1) the measuring speed is high. The traditional pipe burying method has long measuring time, and the method can measure the three-zone range of a goaf in 3-5 days;
(2) the positioning is flexible. The method is convenient to operate, and the drilling position can be selected at any height of the goaf for drilling and gas taking, so that the gas measuring range is enlarged, and the defect that only gas at a single position can be extracted for analysis in the past is overcome;
(3) and the measuring points are convenient to arrange. The method adopts a drilling mode to measure temperature and take gas, so that personnel do not need to enter a dangerous area, and the safety of testing personnel is ensured;
(4) the method has the advantages that instruments and equipment used by the method can be repeatedly used, the problem that the gas taking pipeline is damaged and scrapped due to the fact that the top plate is collapsed in the prior art is solved, and cost is saved.
(5) The method solves the problem that the pipeline is easy to block.
Drawings
Fig. 1 is an overall configuration diagram of a drilling machine used in an embodiment of the present invention.
FIG. 2 is a cross-sectional view of an embodiment of the present invention during drilling.
FIG. 3 is a cross-sectional view of the embodiment of the present invention during gas extraction.
FIG. 4 is a cross-sectional view of the temperature measurement according to the embodiment of the present invention.
FIG. 5 is a top view of an embodiment of the present invention during drilling.
In the figure: 1-a drill bit; 2-a first section of drill pipe; 3-a second section of drill pipe; 4-a third section of drill pipe; 5-drill rod thread; 6-drilling a tail; 7-a drilling machine; 8-coal rock mass; 9-clear water; 10-water and drill cuttings mixed solution; 11-metal hose connections; 12-rubber tube; 13-air intake of air intake pump; 14-negative pressure air pump; 15-air outlet of air-taking pump; 16-an air bag; 17-gas to be taken; 18-temperature probe; 19-a data line; 20-a temperature measuring meter; 21-a closed wall; 22-goaf.
Detailed Description
In order that the objects and advantages of the invention will be more clearly understood, the invention is further described in detail below with reference to examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, the drilling machine used in the embodiment of the present invention includes a drill bit 1, a first section of drill rod 2, a second section of drill rod 3, a third section of drill rod 4, a drill rod thread 5, a drill tail 6 and a drilling machine 7 which are connected in sequence.
As shown in fig. 2 to 5, an embodiment of the present invention provides a goaf coal spontaneous combustion three-zone rapid observation and analysis method, including the following steps:
1) drilling a hole in the coal rock mass of the goaf at a position which is selected to be 30-50m away from the working surface in the direction of the strike, wherein the length of the drilled hole is 30-60m away from the sealing wall, the vertical height of the drilled hole is arranged at a position which is 1.5m away from the coal wall and the bottom plate, the inclination angle is 3-5 degrees, a rock drilling machine is adopted, a D38/27 hollow drill rod is selected, and the drilled hole is constructed in the goaf along the direction of the coal;
2) when the hole is drilled to a position 10m away from the goaf, stopping construction, sending the connected rubber tube to a position 10m away under the protection of a drill rod, pre-pumping for no less than 15min, collecting gas in the hole by using a negative pressure air pump, penetrating the gas into a temperature detection device, and measuring the temperature in the hole;
3) measuring the temperature and gas in the drilled hole, continuing to construct the drilled hole according to 1), stopping construction when the construction reaches 20m, and monitoring the temperature and gas according to 2);
4) repeating the step 3) until the depth of the drilled hole reaches 50m, or stopping the construction of the drilled hole after the concentration of oxygen in the monitored gas is lower than 5%.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.
Claims (5)
1. A goaf coal spontaneous combustion three-zone rapid observation and analysis method is characterized by comprising the following steps:
connecting a drill bit with a first section of drill rod, connecting the tail end of the first drill rod with a drilling machine, starting the drilling machine, drilling a hole in the goaf coal rock mass at a position which is selected to be 30-50m away from a working surface in the direction of the strike, wherein the length of the drilled hole is 30-60m away from a sealing wall, the vertical height of the drilled hole is arranged at a position which is 1.5m away from a bottom plate of a coal wall, the inclination angle is 3-5 degrees, and drilling is carried out in the goaf along the direction; when the drill rod enters 10m of the coal rock mass in the goaf, stopping drilling, measuring the temperature and taking gas; the gas taking method comprises the steps of taking out a temperature measuring device after temperature measurement is finished, sending a metal threading hose to a drill bit along the center of a drill rod, connecting the rear end of a gas taking pipeline with a metal hose joint, connecting a section of PVC rubber pipe to the other end of the joint, connecting the other side of the rubber pipe with a gas sampling pump, and performing gas extraction after connection is finished; after air is pumped for 15 minutes, the air bag is connected to the rear end of the air sampling pump for air collection; after gas is collected, the air bag is taken down to be sealed, the air bag is taken to the ground to measure gas components, then drilling is continued, temperature measurement and gas taking are carried out when drilling is carried out for 10m, and drilling is finished until a drill rod enters 50m in the coal rock mass of the goaf or the concentration of oxygen in monitored gas is lower than 5%; and injecting the collected gas in the coal rock mass air bags around different depths into a gas chromatograph for gas analysis, and recording analysis data.
2. The method for rapidly observing and analyzing the spontaneous combustion of the coal in the goaf according to claim 1, wherein during drilling, clean water is introduced into a drill rod, drill cuttings are washed by a drill bit, and a mixed solution of the drill cuttings and the water is discharged through a gap between the drill rod and a coal rock body; when the first section of drill rod is about to completely enter the coal rock body, the drilling machine is separated from the first section of drill rod, one end of the second section of drill rod is connected with the tail end of the first section of drill rod, then the tail end of the second section of drill rod is connected with the drilling machine, and drilling is continued.
3. The method for rapidly observing and analyzing the spontaneous combustion of the coal in the goaf according to claim 1, wherein the construction is stopped when the hole is drilled to the position of 10m in the goaf, the connected rubber tube is conveyed to the position of 10m under the protection of a drill rod, the pre-pumping time is not less than 15min, the gas in the hole is collected by a negative pressure air pump, and then the gas penetrates into a temperature detection device to measure the temperature in the hole.
4. The goaf coal spontaneous combustion three-zone rapid observation and analysis method of claim 1, wherein temperature measurement is accomplished by the following steps:
when the drill rod enters 10m of the coal rock mass in the goaf, stopping drilling, separating the last drill rod from the drilling machine, loading the connected temperature sensor and the data transmission line into the metal threading hose and fixing the metal threading hose and the metal threading hose together, sending the metal threading hose and the data transmission line to the drill bit along the center of the drill rod, recording data displayed by the temperature display after the temperature is stabilized, continuing drilling, stopping drilling when the drill rod enters 10m, separating the last drill rod from the drilling machine, loading the connected temperature sensor and the data transmission line into the metal threading hose and fixing the metal threading hose and sending the metal threading hose and the data transmission line to the drill bit along the center of the drill rod, recording the data displayed by the temperature display after the temperature is stabilized, continuing drilling until the oxygen concentration in the coal rock mass in the goaf is lower than 5%, and finishing drilling.
5. The method for rapid observation and analysis of three zones of spontaneous combustion of coal in gob as claimed in claim 1, wherein a rock drill is used, and a D38/27 hollow drill rod is selected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710568366.2A CN107227954B (en) | 2017-07-08 | 2017-07-08 | Three-zone rapid observation and analysis method for spontaneous combustion of coal in goaf |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710568366.2A CN107227954B (en) | 2017-07-08 | 2017-07-08 | Three-zone rapid observation and analysis method for spontaneous combustion of coal in goaf |
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| CN107227954B true CN107227954B (en) | 2021-03-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108798649B (en) * | 2018-04-18 | 2022-02-11 | 中国矿业大学 | While-drilling temperature measuring device for coal spontaneous combustion temperature detection |
| CN110886618A (en) * | 2019-12-10 | 2020-03-17 | 阜新新纪煤矿科技所 | Working face goaf vertical spontaneous combustion three-zone test method and fire prevention technology |
| CN113720938A (en) * | 2021-08-31 | 2021-11-30 | 西安科技大学 | Device and method for analyzing gas composition change in coal drilling process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5350018A (en) * | 1993-10-07 | 1994-09-27 | Dowell Schlumberger Incorporated | Well treating system with pressure readout at surface and method |
| GB2464481B (en) * | 2008-10-16 | 2011-11-02 | Dynamic Dinosaurs Bv | Method for installing sensors in a borehole |
| CN104514577B (en) * | 2014-12-12 | 2016-04-20 | 中国矿业大学 | The method of coal seam large area spontaneous combustion in goaf is hidden in a kind of efficient improvement shallow embedding |
| CN104929677B (en) * | 2015-07-10 | 2017-12-29 | 淮南矿业(集团)有限责任公司 | Fire prevention measure bar |
| CN106437632B (en) * | 2016-11-09 | 2018-04-20 | 山西潞安矿业(集团)有限责任公司 | A kind of old goaf gas pumping method in colliery |
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