CN103776659A - Negative-pressure draw-out type coal layer gas content spot sampling method - Google Patents
Negative-pressure draw-out type coal layer gas content spot sampling method Download PDFInfo
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Abstract
The invention discloses a negative-pressure draw-out type coal layer gas content spot sampling method. The spot sampling method comprises the following steps of selecting a proper coal layer testing position, arranging a drilling device for drilling, and arranging a negative-pressure draw-out type sampling device beside the drilling device; in the drilling process, conveying compressed air from the inner part of a drilling rod to the bottom of a hole to blow out drillings from a gap between a hole wall and the drilling rod; when the drilling device drills with a preset sampling depth, stopping the drilling device, and blowing away coal dust retained in the hole through the compressed air; connecting a sampling pipe of the negative pressure draw-out type sampling device with the drilling rod of the drilling device; then continuously drilling the hole, switching on the negative pressure draw-out type sampling device, and enabling fresh coal dust obtained by cutting by a drilling bit to enter a coal sample collector through the drilling bit, an inner pore of the drilling rod and the sampling pipe. According to the negative-pressure draw-out type coal layer gas content spot sampling method, the spot sampling can be realized; furthermore, the sampling time can be shortened; the sampling operation can be finished within seconds; the gas loss of a coal sample is low, and the sampling efficiency is greatly improved; the sampling and the drilling can be implemented synchronously and continuously; the spot sampling method is safe and reliable; the drilling rod does not need to quit.
Description
Technical field
The invention belongs to coal-mine gas diaster prevention and control field, relate in particular to a kind of negative pressure pull-out type coal seam gas-bearing capacity spot sampling method.
Background technology
China's coal and Gas Outburst disaster are serious, although carried out " control coal and Gas Outburst regulation " from 2009, exploitation to coal and Coal Seam Prone To Outburst has proposed strict demand, but coal and Gas Outburst diaster prevention and control situation are still severe, as 2011 from October 4 to November 10 only in 37 days, 3 great above outstanding accidents are recurred, cause 67 people's death, that is: colliery, Guizhou Province's In Qiannan Anping " 10.4 " accident (dead 14 people), private colliery, the village " 11.10 " accident in Henan coalification coking coal nine Li Shan ore deposit " 10.27 " accidents (dead 18 people) and Qujing City of Yunnan Province (dead 35 people).
Coal seam gas-bearing capacity test is an element task in coal-mine gas diaster prevention and control, is not only restricting the accuracy of mine gas hazard level prediction, and affects the reliability of follow-up Firedamp precaution measures.In China's coal and Gas Outburst diaster prevention and control work, extensively adopt the mode of pre-gas pumping to eliminate the outburst hazard in coal seam, but because pre-draining borehole length can reach more than hundred meters, in protrusion-dispelling validity check, after test drainage from coal seam when gas remainder quantity, often need to get coal sample from far coal body deep, limit by sampling method, sample time is long, can reach half an hour to 1 hour, in sampling process, due to a large amount of desorbs of coal body adsorption gas, have a strong impact on the accuracy of coal seam gas remainder quantity measured value, so that form erroneous judgement, lead to a disaster.
Both at home and abroad the method for testing of coal seam gas-bearing capacity is conducted in-depth research, the coal seam gas-bearing capacity assay method that China generally adopts at present has surveys desorption method, indirect method and down-hole nature desorption method.To survey desorption method be that United States Bureau of Mines (USBM) in 1973 proposes the earliest, China obtains widespread use in geologic prospecting department after the people such as good minister improve; Indirect method utilizes coal seam adsorption gas to meet the principle of mono molecule layer adsorption Lang Gemiaoer equation (Langmuir equation), by test coal-bed gas pressure, the parameters such as the moisture of absorption constant a value, b value and coal, ash content, temperature obtain coal seam gas-bearing capacity value indirectly.Down-hole desorption method is the sampling and testing method of surveying a kind of coal mine gas content forming on the basis of desorption method on ground, and widespread use in China's coal-mine exploitation, mainly adopts twist drill rods naturally to arrange powder sampling or layer-through drilling gathers coal core.On coal sample sampling method, also there is the method that adopts wire line coring and pressurize to get core in Di Kan department, but needs expensive core and the drilling equipment got owing to getting core, is difficult to apply; The people such as Wang Zhaofeng have reached the object of spot sampling by sampling hut is set in drilling rod by reversion rig, but are limited by the volume of sampling hut, and sampling amount has been received restriction.Make a general survey of current coal seam gas-bearing capacity method of testing, mainly have following deficiency:
(1), sample time is long, causes in sampling process gas loss amount large.Because gas loss amount is large, at the scene in desorption process, the desorption of mash gas amount and the desorption rate that record are all less than normal, and cause according to the gas loss amount of site desorption amount reckoning less than normal, total cognition causes gas bearing capacity measured value more much lower than actual value, especially the fireballing coal seam of Methane Diffusion, causes coal seam gas-bearing capacity test value deviation larger.Because twist drill rods sampling needs drillings along boring Natural excrement, the time that drillings need to be longer from Di Dao aperture, hole; And adopt coring bit sampling, need to move back the coal sample of taking out coring bit after drilling rod, two kinds of methods in the time that sampling depth is more than 50 meters, the sample time more than often needing half an hour.In taking-up coal sample, gas loss totally, the desorption of mash gas speed of measuring is less than normal, the gas loss amount of calculating is less than normal, and due to desorb a large amount of gas, the residual gas amount of testing in laboratory is still less than normal, cause gas bearing capacity measured value less than normal a lot of compared with actual value, affected the objective evaluation of gas hazard level and follow-uply chosen reliable prophylactico-therapeutic measures.
, be difficult to accomplish real spot sampling, the mixed sample of twist drill rods sampling drillings is serious, requires to have a long way to go with spot sampling, is difficult to distinguish the source of coal sample; And the sampling of sampling hut's reversion rig is set in employing drilling rod, and though can accomplish spot sampling, being limited by the volume of sampling hut, sampling amount is restricted; Though coring bit can spot sampling, and sampling amount is larger, owing to moving back drilling rod overlong time, affect the accuracy of coal seam gas-bearing capacity test, spot sampling method that neither be desirable.
Summary of the invention
The present invention is in order to solve weak point of the prior art, provide a kind of safe and reliable, sample time is short, gas loss amount is little, the negative pressure pull-out type coal seam gas-bearing capacity spot sampling method of fixed point property standard.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: negative pressure pull-out type coal seam gas-bearing capacity spot sampling method, comprises following concrete steps:
(1), choose suitable coal seam test position, arrange that drilling equipment carries out bore operation, and at drilling equipment arranged alongside negative pressure pull-out type sampler;
(2), in drilling process, adopt and press at the bottom of wind delivers to hole from drilling rod inside, drilling cuttings is blown out by the gap between hole wall and drilling rod;
(3), get into after predetermined sampling depth when boring, stop creeping into, with pressing remaining ickings in wind clear opening;
(4), the stopple coupon of negative pressure pull-out type sampler is connected with the drilling rod of drilling equipment;
(5), then continue to creep into, open negative pressure pull-out type sampler simultaneously, negative pressure enters the fresh ickings under bit cutting in special coal sample collector by internal void, the stopple coupon of drill bit, drilling rod;
(6), when coal sample collection amount reaches after requirement, can make drilling equipment and negative pressure pull-out type sampler stop operation, and record negative pressure pressure gauge reading, atmospheric pressure and temperature.
Described drilling equipment comprises rig, drilling rod, drill bit, air line, blast pipe and air intake valve, the clutch end of rig is connected with drilling rod outer end, the inner of a drilling rod of inner terminal is connected with drill bit, the air inlet of rig is connected with air line by blast pipe, and air intake valve is located on blast pipe.
Described negative pressure pull-out type sampler comprises coal sample collection device, stopple coupon, connecting pipe, negative pressure tensimeter and extracts valve, the import of stopple coupon is connected with a drilling rod of outermost end, the outlet of stopple coupon is connected with the import of coal sample collection device, the outlet of coal sample collection device is connected with the import of connecting pipe, and negative pressure tensimeter and extraction valve are all located on connecting pipe.
Described coal sample collection device comprises support and magazine, and both sides, magazine top are connected with stopple coupon and connecting pipe respectively, and magazine is provided with transparent windows, and magazine lower end is provided with discharge duct, and discharge duct is provided with sample cock; See by transparent windows, when coal sample collection amount reaches after requirement, can stop sampling, open sample cock, from magazine, emit coal sample and enter in coal sample tank, can carry out afterwards the site desorption work of gas bearing capacity test.
The outlet of described connecting pipe is provided with jet ejector or negative pressure pump.
The outlet of described connecting pipe is connected with the methane gas extraction pipeline under coal mine.
Adopt technique scheme, the present invention adopts special coal sample collector and improved Special air-driven rig, drill bit and special hollow drill pipe to support the use, and develops negative pressure pull-out type device for fixed point sampling.Get to behind precalculated position when tube sample boring, changing original pressure wind row powder mode is negative pressure pull-out type row powder, utilizes special coal sample collector samples of coal pulled.The present invention not only can accomplish spot sampling, and can shorten sample time, and sampling can complete within the several seconds, in coal sample, gas loss amount is little, has greatly improved sampling efficiency, and sampling work is carried out continuously with drilling to synchronize, safe and reliable, do not need to move back drilling rod.
There being the mine of methane gas extraction pipeline can utilize the negative pressure of methane gas extraction pipeline, do not have the mine of methane gas extraction pipeline need to adopt jet ejector or negative pressure pump as the power that produces negative pressure extracting coal sample.Sampling process can complete within tens seconds, has greatly improved sampling efficiency.
Sampling depth and dip angle of hole, vacuum magnitude etc. are closely related, and the boring elevation angle and negative pressure are larger, and sampling depth is larger, and the boring angle of depression is larger, and extraction pipeline negative pressure is less, and sampling depth is less.In the time that negative pressure is 0.5MPa, horizontal drilling sampling depth is not less than 40 m, is greater than 15 ° of elevation bore sampling depths and is not less than 60m, and 15 ° of angle of depression drill hole sampling degree of depth are not less than 20 m.
Because adopting negative pressure pull-out type, coal sample samples, although shortened sample time, but because institute's coal sampling is in subnormal ambient, different under atmospheric pressure environments from traditional gas bearing capacity coal sample, need to study desorption of mash gas rule under subnormal ambient, because the desorption of mash gas rule of coal sample in negative pressure is only that air pressure is different from atmospheric adsorption law, adsorption law is similar.Therefore, can pass through desorption of mash gas rule under test subnormal ambient, then according to sample time, gas loss amount in sampling process be calculated, the gas loss amount in sampling process is compensated.
Under subnormal ambient, carrying out coal seam gas-bearing capacity method for measuring carries out according to the following steps:
(1), sampling: adopt negative pressure pull-out type spot sampling, sampling 300～400g packs in coal sample tank immediately, in sampling process, notices that record sampling starts to tinning, the time t that coal sample exposes in subnormal ambient
0.
(2), desorption of mash gas quantitative determination: coal sample packs into after coal sample tank, first piercing needle is inserted to the rubber gasket on cover, then tighten cover, and by syringe needle, coal sample tank is connected with desorption instrument, adopt classic method to measure coal sample coal seams gas discharging quantity over time, record final site desorption amount V
2.Taking-up syringe needle after site desorption completes, delivers to laboratory by coal sample tank and analyzes.
(3), under subnormal ambient, coal sample desorption of mash gas rule is measured: utilize the coal sample of taking at gas bearing capacity testing location, use coal sample desorption of mash gas rule under negative pressure desorption apparatus test subnormal ambient in laboratory.
Described negative pressure desorption apparatus comprises coal sample tank, vacuum pump, the tank of open top, graduated cylinder, closed container and glass tube, in tank, be loaded with water, glass tube vertically arranges, the lower end of glass tube extend into the underwater in tank, the upper end of glass tube is fixedly connected with closed container, closed container is connected with vacuum pump by vacuum tube, the outlet of coal sample tank is connected with desorption tube, desorption tube upwards extend in closed container by glass tube lower end, desorption tube is provided with the tensimeter and the first stop valve that close on coal sample tank, tank upper lateral part is provided with run-down pipe, the water delivering orifice of run-down pipe extend in graduated cylinder, vacuum tube is provided with the second stop valve.
(4), loss gas amount is calculated: according to coal sample desorption of mash gas rule under the subnormal ambient recording, calculate t sample time
0interior loss amount V
1.
(5), residual gas amount experimental determination: in laboratory, coal sample heats (95 ℃) vacuum outgas under sealing state, and amount of gas evolved V is for the first time taken out in test
3; Degassed after pulverizing with bowl mill again, determine amount of gas evolved V for the second time
4.The degassed gas composition analysis that simultaneously carries out, degassed end is weighed and industrial components analysis.
(6), according to above-mentioned V
1, V
2, V
3and V
4, and coal sample weight m, finally take computing method, can determine coal seam gas-bearing capacity X
0.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of drilling equipment of the present invention and negative pressure pull-out type sampler;
Fig. 2 is the structural representation of coal sample collection device in Fig. 1;
Fig. 3 is the another kind of structural representation of drilling equipment of the present invention and negative pressure pull-out type sampler;
Fig. 4 is the structural representation while carrying out desorption of mash gas characteristic test under subnormal ambient.
Embodiment
Embodiment mono-, as depicted in figs. 1 and 2, negative pressure pull-out type coal seam gas-bearing capacity spot sampling method, comprises following concrete steps:
(1), choose suitable coal seam 1 test position, arrange that drilling equipment carries out bore operation, and at drilling equipment arranged alongside negative pressure pull-out type sampler;
(2), in drilling process, adopt and press at the bottom of wind delivers to hole from drilling rod 3 inside, drilling cuttings is blown out by the gap between hole wall and drilling rod 3;
(3), get into after predetermined sampling depth when boring, stop creeping into, with pressing remaining ickings in wind clear opening;
(4), the stopple coupon 13 of negative pressure pull-out type sampler is connected with the drilling rod 3 of drilling equipment;
(5), then continue to creep into, open negative pressure pull-out type sampler simultaneously, the fresh ickings of negative pressure under drill bit 2 is cut enters in special coal sample collector 5 by internal void, the stopple coupon 13 of drill bit 2, drilling rod 3;
(6), when coal sample collection amount reaches after requirement, can make drilling equipment and negative pressure pull-out type sampler stop operation, and record negative pressure tensimeter 7 readings, atmospheric pressure and temperature.
Drilling equipment comprises rig 4, drilling rod 3, drill bit 2, air line 11, blast pipe 14 and air intake valve 10, the clutch end of rig 4 is connected with drilling rod 3 outer ends, the inner of a drilling rod 3 of inner terminal is connected with drill bit 2, the air inlet of rig 4 is connected with air line 11 by blast pipe 14, and air intake valve 10 is located on blast pipe 14.
Negative pressure pull-out type sampler comprises coal sample collection device 5, stopple coupon 13, connecting pipe 8, negative pressure tensimeter 7 and extracts valve 6, the import of stopple coupon 13 is connected with a drilling rod 3 of outermost end, the outlet of stopple coupon 13 is connected with the import of coal sample collection device 5, the outlet of coal sample collection device 5 is connected with the import of connecting pipe 8, and negative pressure tensimeter 7 and extraction valve 6 are all located on connecting pipe 8.
Coal sample collection device 5 comprises support 15 and magazine 16, magazine 16 both sides, top are connected with stopple coupon 13 and connecting pipe 8 respectively, magazine 16 is provided with transparent windows 17, and magazine 16 lower ends are provided with discharge duct 18, and discharge duct 18 is provided with sample cock 19; See by transparent windows 17, when coal sample collection amount reaches after requirement, can stop sampling, open sample cock 19, from magazine 16, emit coal sample and enter in coal sample tank, can carry out afterwards the site desorption work of gas bearing capacity test.Remain coal sample simultaneously and pack special sampling bag into, send into laboratory and carry out desorption of mash gas characteristic test under subnormal ambient.
The outlet of connecting pipe 8 is connected with the methane gas extraction pipeline 9 under coal mine.
The present invention adopts special coal sample collector 5 and improved Special air-driven rig 4, drill bit 2 and special hollow drill pipe 3 to support the use, and develops negative pressure pull-out type device for fixed point sampling.Get to behind precalculated position when tube sample boring, changing original pressure wind row powder mode is negative pressure pull-out type row powder, utilizes special coal sample collector 5 samples of coal pulled.The present invention not only can accomplish spot sampling, and can shorten sample time, and sampling can complete within the several seconds, in coal sample, gas loss amount is little, has greatly improved sampling efficiency, and sampling work is carried out continuously with drilling to synchronize, safe and reliable, do not need to move back drilling rod 3.
Sampling depth and dip angle of hole, vacuum magnitude etc. are closely related, and the boring elevation angle and negative pressure are larger, and sampling depth is larger, and the boring angle of depression is larger, and extraction pipeline negative pressure is less, and sampling depth is less.In the time that negative pressure is 0.5MPa, horizontal drilling sampling depth is not less than 40 m, is greater than 15 ° of elevation bore sampling depths and is not less than 60m, and 15 ° of angle of depression drill hole sampling degree of depth are not less than 20 m.
Embodiment bis-, as shown in Figure 3, the difference of this embodiment and embodiment mono-is: the outlet of connecting pipe 8 is provided with jet ejector or negative pressure pump 12.
There being the mine of methane gas extraction pipeline 9 can utilize the negative pressure of methane gas extraction pipeline 9, do not have the mine of methane gas extraction pipeline 9 need to adopt jet ejector or negative pressure pump 12 as the power that produces negative pressure extracting coal sample.Sampling process can complete within tens seconds, has greatly improved sampling efficiency.
Above-described embodiment is not done any pro forma restriction to technical scheme of the present invention etc., and any simple modification, equivalent variations and modification that every foundation technical spirit of the present invention is done above embodiment all belong to the protection domain of technical solution of the present invention.
Because adopting negative pressure pull-out type, coal sample samples, although shortened sample time, but because institute's coal sampling is in subnormal ambient, different under atmospheric pressure environments from traditional gas bearing capacity coal sample, need to study desorption of mash gas rule under subnormal ambient, because the desorption of mash gas rule of coal sample in negative pressure is only that air pressure is different from atmospheric adsorption law, adsorption law is similar.Therefore, can pass through desorption of mash gas rule under test subnormal ambient, then according to sample time, gas loss amount in sampling process be calculated, the gas loss amount in sampling process is compensated.
Under subnormal ambient, carrying out coal seam gas-bearing capacity method for measuring carries out according to the following steps:
(1), sampling: adopt negative pressure pull-out type spot sampling, sampling 300～400g packs in coal sample tank immediately, in sampling process, notices that record sampling starts to tinning, the time t that coal sample exposes in subnormal ambient
0.
(2), desorption of mash gas amount on-site measurement: coal sample packs into after coal sample tank, first piercing needle is inserted to the rubber gasket on cover, then tighten cover, and by syringe needle, coal sample tank is connected with desorption instrument, adopt classic method to measure coal sample coal seams gas discharging quantity over time, record final site desorption amount V
2, taking-up syringe needle after site desorption completes, delivers to laboratory by coal sample tank and analyzes.
(3), under subnormal ambient, coal sample desorption of mash gas rule is measured: utilize the coal sample of taking at gas bearing capacity testing location, coal sample desorption of mash gas rule under laboratory test subnormal ambient.
Negative pressure desorption apparatus as shown in Figure 4, comprise coal sample tank 20, vacuum pump 21, the tank 22 of open top, graduated cylinder 23, closed container 24 and glass tube 25, in tank 22, be loaded with water 26, glass tube 25 vertically arranges, the lower end of glass tube 25 extend into the underwater in tank 22, the upper end of glass tube 25 is fixedly connected with closed container 24, closed container 24 is connected with vacuum pump 21 by vacuum tube 27, the outlet of coal sample tank 20 is connected with desorption tube 28, desorption tube 28 upwards extend in closed container 24 by glass tube 25 lower ends, desorption tube 28 is provided with the tensimeter 29 and the first stop valve 30 that close on coal sample tank 20, tank 22 upper lateral parts are provided with run-down pipe 32, the water delivering orifice of run-down pipe 32 extend in graduated cylinder 23, vacuum tube 27 is provided with the second stop valve 31.
The coal sample that scene is taked, take out sampling bag, keep original components unchanged in coal sample, after weighing, pack in coal sample tank 20, coal sample tank 20 is put into thermostatted water, adjusting bath temperature is sampling spot temperature, after above-mentioned negative pressure desorption apparatus connects, carries out coal sample desorption of mash gas rule test under subnormal ambient.
Test is undertaken by a tank 22 and glass tube 25, bleed water column is entered in closed container 21 by vacuum pump 21, closing the second stop valve 9 makes to produce negative pressure in closed container 21, vacuum magnitude can change by adjusting the length of glass tube 25, and makes water 26 in tank 22 just in time not overflow 32,1 meters of glass tubes 25 of run-down pipe can to produce the negative pressure of about 10kPa, the diameter of closed container 24 is 20cm, height 20cm, volume 6280mL, the gas bearing capacity of coal body is assumed to 10m
3/ t, standard volume after whole desorbs of 100g test coal sample is 1000mL, therefore, in the time opening the first stop valve 30, gas in coal sample in coal sample tank 20 desorbs under subnormal ambient, liquid level variation is less, gas is desorb under constant negative pressure substantially, the gas desorbing enters on the water surface in closed container 24 by desorption tube 28, pressure in closed container 24 increases, and the interior water column of glass tube 25 declines, and water is pressed in tank 22, flow in graduated cylinder 23 by run-down pipe 32, the water yield of graduated cylinder 23 is the desorption quantity of gas again.Can obtain the desorption of mash gas rule of coal sample under subnormal ambient by test.
(4), loss gas amount is calculated: according to coal sample desorption of mash gas rule under the subnormal ambient recording, calculate t sample time
0interior loss amount V
1.
(5), residual gas amount experimental determination: in laboratory, coal sample heats (95 ℃) vacuum outgas under sealing state, and amount of gas evolved V is for the first time taken out in test
3; Degassed after pulverizing with bowl mill again, determine amount of gas evolved V for the second time
4.The degassed gas composition analysis that simultaneously carries out, degassed end is weighed and industrial components analysis.
(6), according to above-mentioned V
1, V
2, V
3and V
4, and coal sample weight m, finally take computing method, can determine coal seam gas-bearing capacity X
0.
Claims (6)
1. negative pressure pull-out type coal seam gas-bearing capacity spot sampling method, is characterized in that: comprise following concrete steps,
(1), choose suitable coal seam test position, arrange that drilling equipment carries out bore operation, and at drilling equipment arranged alongside negative pressure pull-out type sampler;
(2), in drilling process, adopt and press at the bottom of wind delivers to hole from drilling rod inside, drilling cuttings is blown out by the gap between hole wall and drilling rod;
(3), get into after predetermined sampling depth when boring, stop creeping into, with pressing remaining ickings in wind clear opening;
(4), the stopple coupon of negative pressure pull-out type sampler is connected with the drilling rod of drilling equipment;
(5), then continue to creep into, open negative pressure pull-out type sampler simultaneously, negative pressure enters the fresh ickings under bit cutting in special coal sample collector by internal void, the stopple coupon of drill bit, drilling rod;
(6), when coal sample collection amount reaches after requirement, can make drilling equipment and negative pressure pull-out type sampler stop operation, and record negative pressure pressure gauge reading, atmospheric pressure and temperature.
2. negative pressure pull-out type coal seam gas-bearing capacity spot sampling method according to claim 1, it is characterized in that: described drilling equipment comprises rig, drilling rod, drill bit, air line, blast pipe and air intake valve, the clutch end of rig is connected with drilling rod outer end, the inner of a drilling rod of inner terminal is connected with drill bit, the air inlet of rig is connected with air line by blast pipe, and air intake valve is located on blast pipe.
3. negative pressure pull-out type coal seam gas-bearing capacity spot sampling method according to claim 2, it is characterized in that: described negative pressure pull-out type sampler comprises coal sample collection device, stopple coupon, connecting pipe, negative pressure tensimeter and extracts valve, the import of stopple coupon is connected with a drilling rod of outermost end, the outlet of stopple coupon is connected with the import of coal sample collection device, the outlet of coal sample collection device is connected with the import of connecting pipe, and negative pressure tensimeter and extraction valve are all located on connecting pipe.
4. negative pressure pull-out type coal seam gas-bearing capacity spot sampling method according to claim 3, it is characterized in that: described coal sample collection device comprises support and magazine, both sides, magazine top are connected with stopple coupon and connecting pipe respectively, magazine is provided with transparent windows, magazine lower end is provided with discharge duct, and discharge duct is provided with sample cock; See by transparent windows, when coal sample collection amount reaches after requirement, can stop sampling, open sample cock, from magazine, emit coal sample and enter in coal sample tank, can carry out afterwards the site desorption work of gas bearing capacity test.
5. according to the negative pressure pull-out type coal seam gas-bearing capacity spot sampling method described in claim 3 or 4, it is characterized in that: the outlet of described connecting pipe is provided with jet ejector or negative pressure pump.
6. according to the negative pressure pull-out type coal seam gas-bearing capacity spot sampling method described in claim 3 or 4, it is characterized in that: the outlet of described connecting pipe is connected with the methane gas extraction pipeline under coal mine.
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| CN109443859A (en) * | 2018-12-25 | 2019-03-08 | 西安科技大学 | A kind of negative pressure low temperature coal seam gas-bearing capacity measurement sampler |
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| CN112523707A (en) * | 2020-12-03 | 2021-03-19 | 中煤科工集团重庆研究院有限公司 | Coal and gas outburst danger prediction while drilling device and prediction method thereof |
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| CN113944498A (en) * | 2021-10-18 | 2022-01-18 | 中煤科工集团重庆研究院有限公司 | Device and method for accurately measuring gas flow on negative pressure side in coal seam gas extraction |
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| CN114235480A (en) * | 2021-12-21 | 2022-03-25 | 上海应用技术大学 | Coal seam gas content negative pressure fixed point sampling method |
| CN114235480B (en) * | 2021-12-21 | 2023-12-22 | 上海应用技术大学 | Negative pressure fixed-point sampling method for gas content in coal bed |
| CN114592905A (en) * | 2022-04-27 | 2022-06-07 | 中国矿业大学 | Low-negative-pressure ejection deep hole continuous sampling system and sampling method |
| CN114592905B (en) * | 2022-04-27 | 2022-12-30 | 中国矿业大学 | Low-negative-pressure ejection deep hole continuous sampling system and sampling method |
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