CN111579282A - In-situ detection method for primary CO in coal bed - Google Patents
In-situ detection method for primary CO in coal bed Download PDFInfo
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- CN111579282A CN111579282A CN202010470874.9A CN202010470874A CN111579282A CN 111579282 A CN111579282 A CN 111579282A CN 202010470874 A CN202010470874 A CN 202010470874A CN 111579282 A CN111579282 A CN 111579282A
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- 239000003245 coal Substances 0.000 title claims abstract description 80
- 238000001514 detection method Methods 0.000 title claims abstract description 19
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 111
- 239000007789 gas Substances 0.000 claims abstract description 77
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 55
- 238000000034 method Methods 0.000 claims abstract description 48
- 238000005553 drilling Methods 0.000 claims abstract description 38
- 238000002347 injection Methods 0.000 claims abstract description 32
- 239000007924 injection Substances 0.000 claims abstract description 32
- 238000005070 sampling Methods 0.000 claims abstract description 31
- 238000007789 sealing Methods 0.000 claims abstract description 20
- 238000010276 construction Methods 0.000 claims abstract description 14
- 238000004817 gas chromatography Methods 0.000 claims abstract description 3
- 238000005065 mining Methods 0.000 claims description 8
- 239000002893 slag Substances 0.000 claims description 5
- 238000000605 extraction Methods 0.000 claims description 3
- 230000002045 lasting effect Effects 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 21
- 239000010959 steel Substances 0.000 abstract description 21
- 238000012360 testing method Methods 0.000 abstract description 17
- 238000003795 desorption Methods 0.000 description 10
- 229910052760 oxygen Inorganic materials 0.000 description 9
- 238000007254 oxidation reaction Methods 0.000 description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
- 230000003647 oxidation Effects 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 5
- 230000002269 spontaneous effect Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229910001873 dinitrogen Inorganic materials 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011440 grout Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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- 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
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
- G01N1/08—Devices for withdrawing samples in the solid state, e.g. by cutting involving an extracting tool, e.g. core bit
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- 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
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- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a method for in-situ detection of original CO in a coal seam, which relates to the field of geological exploration and comprises the following steps: s1: firstly, drilling to 5/6 length of the calculated hole length, changing the pressure to nitrogen for deslagging, and then continuously drilling to the calculated hole length; s2: after drilling and forming holes, respectively arranging 2 steel pipes externally connected with ball valves in the drill holes, arranging the other ends of the steel pipes at the bottom ends of the holes, and sealing the ends of the drill holes by adopting a bag type two-plugging one-injection device and process to form a closed air chamber; s3: injecting high-purity nitrogen into the nitrogen injection pipe, allowing the high-purity nitrogen to enter the closed gas chamber, and extracting gas in the closed gas chamber from the sampling pipe; s4: the collected gas sample was analyzed by gas chromatography. The method aims to eliminate the possibility of contact between coal bodies in a test area and air, protect the coal bodies by adopting high-purity nitrogen in the drilling construction process, replace gas in a gas chamber by using the high-purity nitrogen after a test gas chamber is formed, remove a small amount of CO which is possibly adsorbed in the gas chamber, and create conditions for accurately testing whether the primary CO exists in the coal bed.
Description
Technical Field
The invention relates to the field of geological exploration, in particular to a method for in-situ detection of original CO in a coal seam.
Background
Early prediction and forecast are the key points of comprehensive prevention and control of coal spontaneous combustion disasters. At present, an indirect method is mainly adopted, the ignition state of coal is determined by collecting a gas sample for analysis and comparing the gas sample with measured index gas, and CO is common and effective index gas. However, field practice has shown that coal spontaneous combustion is not the only source of downhole CO, and in many low rank coal mining processes, CO gas in coal bed gas is continuously detected to exceed the standard of coal mine safety regulations for a long time. Some of the coal is caused by spontaneous combustion, and others are not caused by spontaneous combustion and are probably caused by primary CO gas in a primary coal bed, so that the normal development of the safety production work of the coal mine is seriously influenced. At present, generally, the CO overrun is caused by underground blasting work or natural ignition of a coal bed, the reasons of desorption and diffusion of CO adsorbed by the coal bed and the like are rarely considered, the research on the generation, occurrence and adsorption and desorption rules of primary CO in the coal bed is insufficient, the generation mechanism of the CO in the coal bed is not clearly known, and a complete determination method for CO diffusion after coal bed mining and crushing is not formed. Therefore, the method has important scientific significance for measuring the native CO of the coal seam of the mine, researching the generation mechanism of the native CO, analyzing the adsorption characteristic of the CO and the diffusion rule of the CO after the coal body is crushed, improving the self-combustion forecasting accuracy of the coal, ensuring the normal and safe production of coal mine enterprises and ensuring the safety of miners.
In the prior publication, its application No. cn201510079748.x, with application names: a method for measuring the content of native CO gas in a coal seam comprises the following steps: adopting a wet drilling sampling method to obtain a coal sample, and filling the coal sample into a whole-course integrated closed sample tank with checked air tightness; after the coal sample is filled, the underground CO desorption amount is obtained by utilizing the closed sample tank and using a normal-pressure natural desorption degassing method; then, measuring the CO desorption amount before and after crushing the coal sample in the closed sample tank by using a normal-pressure nitrogen-charging desorption method; correcting the measured underground CO desorption amount and the CO desorption amount before and after crushing the coal sample by adopting an air pressure change principle, and determining the CO loss amount in the measuring process according to the exposure time of the coal sample; and taking the sum of the corrected underground CO desorption amount, the CO desorption amount before and after crushing the coal sample and the CO loss amount as the original CO gas content of the coal bed. According to the method, the content of CO is determined by taking a coal sample and analyzing gas in the coal sample, so that the content of CO exists, and if the coal sample is not timely contacted with air in the taking-out process, the result error of determination is caused.
Disclosure of Invention
The invention provides a method for in-situ detection of original CO in a coal bed, which aims to construct a drill hole in an original coal bed area which is not influenced by mining, eliminate the possibility that coal bodies in a test area historically contact with air, protect the coal bodies by adopting high-purity nitrogen in the drilling construction process, avoid the oxidation of the coal bodies, replace gas in a gas chamber by the high-purity nitrogen after a test gas chamber is formed, remove a small amount of CO which is possibly adsorbed in the gas chamber, achieve the purpose of eliminating CO generated in the forming process of the test gas chamber and create conditions for accurately testing whether the original CO exists in the coal bed.
A method for in-situ detection of native CO in a coal seam comprises the following steps:
s1: drilling holes in a coal seam area which is not influenced by mining by utilizing an existing roadway, firstly drilling the holes to 5/6 length of the calculated hole length, wherein the depth is the compressed air slag removal, then continuously drilling the holes to the calculated hole length, and injecting nitrogen to the depth for slag removal;
s2: after drilling and forming a hole, respectively arranging a sampling tube and a nitrogen injection tube in the drill hole, wherein the sampling tube and the nitrogen injection tube are externally connected with a ball valve, one end of the sampling tube and the nitrogen injection tube connected with the ball valve is higher than the top of the hole, and the other end of the sampling tube and the nitrogen injection tube connected with the ball valve is arranged at the bottom end of the hole;
s3: when a gas sample is collected, injecting high-purity nitrogen into the nitrogen injection pipe to enable the high-purity nitrogen to enter the closed gas chamber, then sucking gas in the closed gas chamber from one end of the sampling pipe connected with the ball valve, stopping gas extraction after lasting for 15min, closing the nitrogen injection pipe, and stopping nitrogen injection;
s4: the collected gas sample was analyzed by gas chromatography.
Preferably, the normal distance between the roadway of the S1 construction drill hole and the closed air chamber is more than 20 m.
Preferably, the height of the S1 drilling hole is 1.5m from the coal seam floor, the vertical lane side is arranged at an elevation angle of 5 degrees.
Preferably, the S2 bag-type two-plugging one-injection device and the process hole sealing specifically include: in the drilled drill hole, the hole sealing length is 27m, wherein the inner bag is 28m away from the hole opening, the outer bag is 1m away from the hole opening, and a 2m sealed air chamber is formed at the bottom of the hole.
Preferably, the S2 sampling tube is a floral tube within 1m from the bottom of the hole.
The invention has the beneficial effects that: before a test air chamber is formed in the drilling process, nitrogen is used for deslagging in the drilling process, so that ventilation and oxygen supply to the coal body in the drilling process are avoided, and the possibility of generating CO through oxidation reaction between the coal and oxygen in the air in the drilling process is avoided; the steel pipe is used for sampling gas from the gas chamber after hole sealing, and the perforated pipe at the end is used for realizing full contact between gas in the pipeline and gas in the gas chamber and preventing the end of the steel pipe from being blocked and unvented; the steel pipe is not suitable to be large, sealing is facilitated, and the air chamber is not contacted with external air or leaks air after hole sealing is realized; and nitrogen is injected into the gas chamber after hole sealing, and the gas in the gas chamber is replaced, so that the possibility of oxidation caused by contact of coal around the gas chamber and oxygen is further avoided, and the oxidation interference when CO exists in the subsequently collected gas is eliminated. Analyzing with gas chromatograph to mainly analyze CO and O in gas2、N2、CH4And other hydrocarbon gases, to determine whether to useContains native CO.
The in-situ detection method is a reliable method for judging the original CO of the coal bed by testing whether the desorbed gas in the coal body which is not influenced by mining contains CO, and has two key aspects, namely, avoiding the generation of CO due to the oxidation of the coal body around a gas chamber and oxygen in the drilling construction and the subsequent test process; and secondly, after the test air chamber is formed, the air chamber is ensured to be sealed and does not generate gas exchange with surrounding roadways. The control of the way of eliminating CO generated by coal oxidation in the existing test method is not thorough, and the primary CO in-situ detection method provided by the invention aims at solving the two keys, and provides the possibility of eliminating CO generated by coal oxygen reaction in the whole process of test position, gas chamber formation and subsequent test, so that the accurate detection and judgment of whether the coal bed contains CO gas can be realized.
Drawings
FIG. 1 is a schematic diagram of a drilling structure of a method for in-situ detection of native CO in a coal seam according to the present invention.
1-nitrogen injection tube, 2-floral tube, 3-4 minutes steel tube, 4-grouting tube, 5-outer bag, 6-sampling nozzle, 7-closed air chamber, 8-inner bag.
Detailed Description
The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.
A method for in-situ detecting original CO in a coal seam includes the steps of utilizing an existing roadway to construct a drill hole in a coal seam area which is not affected by mining, sealing the drill hole, forming a sealed air chamber at the end of the drill hole, and judging whether the original coal seam contains original CO or not by collecting and analyzing whether gas in the sealed air chamber contains CO or not. The core of the method is that the formation process of the closed gas chamber in the drill hole avoids CO generated by coal body oxidation or CO generated from being retained in an observation gas chamber, and the specific technical method comprises the following steps:
s1: in the embodiment, the construction position of the drilled hole is determined, a drilling machine is fixed, the drilled hole is drilled in a nuclear pair before drilling, the vertical roadway side and the drilled hole are arranged at an elevation angle of 5 degrees, wherein the elevation angle refers to the elevation angle between the drilled hole and the horizontal plane.
S2: the aperture of a construction drill hole is 50mm or 75mm, nitrogen is injected for deslagging after 25m of drilling construction, then the construction is continued for 5m under the condition of nitrogen deslagging, meanwhile, the drilling speed is controlled in the drilling construction process, and the drilling speed cannot be too fast, in the process of the embodiment, nitrogen is injected for deslagging after 5m, so that the phenomenon that air is in contact with coal and oxidized in the drilling construction process to generate CO is avoided, meanwhile, a nitrogen injection pipeline and a drilling construction air compression joint are pre-processed into a switching device to facilitate the fast switching of a deslagging mode, and meanwhile, the drill rod is always used for injecting nitrogen into the drill hole in the process of withdrawing the drill rod; in the process of drilling, the normal distance between a construction roadway and an expected closed air chamber is larger than 20m, a roadway loosening crack ring is avoided, the height of a drilling hole is 1.5m away from a coal seam bottom plate, the vertical roadway side is provided, the elevation angle is 5 degrees, drilling and slag discharging are facilitated, the vertical height difference between a drilling hole final point and a hole forming point is estimated to be 2.6m, the whole drilling hole is positioned in the coal seam, and the final hole point is close to a coal seam top plate.
S3: after the hole is formed by drilling, 24 branch steel pipes are arranged in the drill hole, one of the 4 branch steel pipes is an external ball valve, the range of the steel pipe, 1m away from the hole bottom, is a floral pipe, the 4 branch steel pipe is a sampling pipe, the other steel pipe is a nitrogen injection pipe of the external ball valve, the external ball valves on the two steel pipes are both in an open state, and a sampling nozzle for sampling gas is not connected with the sampling pipe at this time. One end of the sampling tube and one end of the nitrogen injection tube external connection ball valve are both higher than the top of the hole, the other end of the sampling tube and the nitrogen injection tube are arranged at the bottom end of the hole, the nitrogen injection tube is used for keeping injecting nitrogen into the drilled hole, and the nitrogen injected into the drilled hole is discharged through the sampling tube.
S4: and then, hole sealing is carried out by adopting a hole sealing device or method with high hole sealing quality, such as a bag type two-plugging one-injection device and a process hole sealing, so that a closed air chamber is formed at the lower part of the drilled hole. The hole sealing principle of two-plugging one-injecting is that a grouting pipe is used for grouting a bag, the bag is in close contact with the wall of a drill hole after the bag expands, and when grouting pressure exceeds the opening pressure of a grouting nozzle, the grouting nozzle injects grout into a gap between 2 bags to enter a gap between the bag and the wall of the drill hole and a coal body gap at a certain depth of the periphery of the drill hole, so that hole sealing of the extraction drill hole is realized. In the implementation process, the hole sealing length is 27m, wherein the distance between the inner bag and the hole opening is 28m, the distance between the outer bag and the hole opening is 1m, 2m closed air chambers are formed at the bottom of the hole while the hole sealing quality is ensured, and meanwhile, the bottom ends of the nitrogen injection pipe and the perforated pipe are arranged in the closed air chambers at the bottom of the drill hole.
S5: keeping the nitrogen injection pipe continuously injecting nitrogen for 24 hours to solidify the sealing material, ensuring the initial strength to be favorable for extracting a gas sample, then connecting a sampling nozzle to the sampling pipe, closing the ball valve of the sampling pipe, and then closing the ball valve of the nitrogen injection pipe; and after 48h, connecting the sampling bag with a sampling nozzle to extract a gas sample in the sealed air chamber, closing the ball valve on the sampling tube after lasting for 15min, closing the ball valve on the nitrogen injection tube, and stopping sampling the gas sample. In this embodiment, when getting gas, the sample bag is connected the sample nozzle, utilizes the native gas's in the coal seam pressure of analytic coal seam to get gas automatically, avoids the airtight air chamber of air admission.
S6: the sealed gas of the sealed gas chamber in the drill hole collected in the sampling bag is brought to the ground, and the gas chromatograph is adopted to analyze the components and the concentration of the collected gas, and the gas is mainly used for analyzing CO and O in the gas2、N2、CH4And other hydrocarbon gases to determine whether or not the raw CO is contained.
Further, the drilling structure of the in-situ detection method is shown in fig. 1, and for convenience of understanding, the structure can be simply explained as follows: the method comprises the steps of firstly forming holes by utilizing the existing drilling technology, wherein the diameter of each drilled hole is 75mm, the depth of each drilled hole is 30m, then arranging 2 steel pipes in the drilled holes, wherein one steel pipe is a 4-minute steel pipe 3 externally connected with a ball valve, the range of the 4-minute steel pipe from the hole bottom to 1m is a flower pipe 2, the other steel pipe is a nitrogen injection pipe 1 externally connected with the ball valve and having the diameter of 8mm, and meanwhile, one end of each externally connected ball valve 5 of the 4-minute steel pipe 3 and the nitrogen injection pipe 1 is higher than the hole top while the other end is arranged at the bottom end of the hole bottom; then, a bag type two-plugging one-injecting device and a bag type two-plugging one-injecting process are adopted, and a grouting pipe 4 is used for grouting to seal holes, wherein the technology is the prior art, and the specific implementation is not specifically described herein; in the implementation process, the hole sealing length is 27m, wherein the distance between an inner bag 8 and an orifice is 28m, the distance between an outer bag 5 and the orifice is 1m, the hole bottom is enabled to form a 2m closed air chamber 7 while the hole sealing quality is ensured, and the bottom ends of a nitrogen injection pipe 1 and a perforated pipe 2 are arranged in the closed air chamber 7 at the bottom of a drill hole; then open the ball valve on annotating the nitrogen pipe 1, through annotating high-purity nitrogen gas to annotating nitrogen pipe 1, make high-purity nitrogen gas enter into airtight air chamber 7, keep annotating nitrogen pipe 1 and continuously annotate 24h after, connect sample mouth 6 from 4 minutes steel pipe 3 one end that connect the ball valve, open 4 minutes steel pipe 3 on the ball valve, utilize the sample bag to connect sample mouth 6 and absorb the gas in airtight air chamber 7, last 15min later close 4 minutes steel pipe 3 on the ball valve stop getting gas earlier, close the last ball valve of annotating nitrogen pipe 1 again, stop annotating nitrogen.
Furthermore, the in-situ detection method aims at determining whether the desorbed gas in the coal body which is not influenced by mining contains CO or not, and is a reliable method for determining the original CO of the coal bed, wherein two key aspects are that firstly, the phenomenon that the coal body around a gas chamber is oxidized with oxygen to generate CO in the drilling construction and the subsequent test process is avoided; and secondly, after the test air chamber is formed, the air chamber is ensured to be sealed and does not generate gas exchange with surrounding roadways. The control of the way of eliminating CO generated by coal oxidation in the existing test method is not thorough, and the primary CO in-situ detection method provided by the invention aims at solving the two keys, and provides the possibility of eliminating CO generated by coal oxygen reaction in the whole process of test position, gas chamber formation and subsequent test, so that the accurate detection and judgment of whether the coal bed contains CO gas can be realized.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. A method for in-situ detection of native CO in a coal seam is characterized by comprising the following steps:
s1: drilling holes in a coal seam area which is not influenced by mining by utilizing an existing roadway, firstly drilling the holes to 5/6 length of the calculated hole length, wherein the depth is the compressed air slag removal, then continuously drilling the holes to the calculated hole length, and injecting nitrogen to the depth for slag removal;
s2: after drilling and forming a hole, respectively arranging a sampling tube and a nitrogen injection tube in the drill hole, wherein the sampling tube and the nitrogen injection tube are externally connected with a ball valve, one end of the sampling tube and the nitrogen injection tube connected with the ball valve is higher than the top of the hole, and the other end of the sampling tube and the nitrogen injection tube connected with the ball valve is arranged at the bottom end of the hole;
s3: when a gas sample is collected, injecting high-purity nitrogen into the nitrogen injection pipe to enable the high-purity nitrogen to enter the closed gas chamber, then sucking gas in the closed gas chamber from one end of the sampling pipe connected with the ball valve, stopping gas extraction after lasting for 15min, closing the nitrogen injection pipe, and stopping nitrogen injection;
s4: the collected gas sample was analyzed by gas chromatography.
2. The in-situ detection method for the native CO in the coal seam according to claim 1, wherein a normal distance between a roadway of the S1 construction drill hole and the closed air chamber is more than 20 m.
3. The in-situ detection method for native CO in the coal seam according to claim 1, wherein the height of the drilled hole of S1 is 1.5m from the floor of the coal seam, the vertical drift side is arranged at an elevation angle of 5 °.
4. The in-situ detection method for native CO in a coal seam according to claim 1, wherein the S2 bag type two-plugging one-injection device and the process hole sealing specifically comprise: in the drilled drill hole, the hole sealing length is 27m, wherein the inner bag is 28m away from the hole opening, the outer bag is 1m away from the hole opening, and a 2m sealed air chamber is formed at the bottom of the hole.
5. The in-situ detection method for native CO in a coal seam according to claim 1, wherein the S2 sampling pipe is a perforated pipe at a distance of 1m from the bottom of the hole.
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| CN114814080A (en) * | 2021-09-26 | 2022-07-29 | 太原理工大学 | Raw coal occurrence CO gas determination device and method capable of eliminating oxidation interference |
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Application publication date: 20200825 |