CN109443859A - A kind of negative pressure low temperature coal seam gas-bearing capacity measurement sampler - Google Patents
A kind of negative pressure low temperature coal seam gas-bearing capacity measurement sampler Download PDFInfo
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- CN109443859A CN109443859A CN201811588701.6A CN201811588701A CN109443859A CN 109443859 A CN109443859 A CN 109443859A CN 201811588701 A CN201811588701 A CN 201811588701A CN 109443859 A CN109443859 A CN 109443859A
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- 239000003245 coal Substances 0.000 title claims abstract description 113
- 238000005259 measurement Methods 0.000 title description 16
- 238000005553 drilling Methods 0.000 claims abstract description 105
- 239000007789 gas Substances 0.000 claims abstract description 85
- 238000005070 sampling Methods 0.000 claims abstract description 73
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 42
- 238000000034 method Methods 0.000 claims abstract description 30
- 230000008878 coupling Effects 0.000 claims abstract description 26
- 238000010168 coupling process Methods 0.000 claims abstract description 26
- 238000005859 coupling reaction Methods 0.000 claims abstract description 26
- 239000007788 liquid Substances 0.000 claims abstract description 21
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 21
- 238000002347 injection Methods 0.000 claims abstract description 11
- 239000007924 injection Substances 0.000 claims abstract description 11
- 230000005540 biological transmission Effects 0.000 claims abstract description 5
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 6
- 239000002817 coal dust Substances 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 4
- 229910000851 Alloy steel Inorganic materials 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000003381 stabilizer Substances 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000003795 desorption Methods 0.000 abstract description 8
- 238000007254 oxidation reaction Methods 0.000 abstract description 3
- 239000000523 sample Substances 0.000 description 48
- 238000010276 construction Methods 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 3
- 239000003818 cinder Substances 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 238000003556 assay Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000520 microinjection Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000007115 recruitment Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Classifications
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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
- G01N1/22—Devices for withdrawing samples in the gaseous state
-
- 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
- G01N2001/2282—Devices for withdrawing samples in the gaseous state with cooling means
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Molecular Biology (AREA)
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- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a kind of negative pressure low temperature coal seam gas-bearing capacitys to measure sampler, including drill bit, drilling rod, sampler and drilling machine；Between drilling rod and drill bit, screw thread, plug and socket connection are used between drilling rod and drilling rod, to guarantee the accuracy and reliability that are coupled；Sampler is internally provided with rotary coupling, and one end of rotary coupling is connect with drilling rod, and the other end is connected with shaft, shaft and rotary coupling by sealing bearing seal inside sampler；Shaft rotation drives rotary coupling, and power continuation is transmitted to forward the drilling rod in shaft coupling and front, and drill bit is driven to creep into.Motor is set inside sampler, and motor utilizes compressed gas-driven, is driven and is pumped by transmission shaft, realizes sampling below atmospheric pressure；Liquid nitrogen injection hole is set on sampler, micro liquid nitrogen is injected in drilling process to drill bit, realizes low temperature sampling.The present invention effectively increases sampling purity, reduces the rate of coal borer bits high-temperature oxydation and desorption under high temperature gas, makes to measure more acurrate.
Description
Technical field
The present invention relates to coal seam gas-bearing capacity determination techniques fields, more particularly to a kind of negative pressure low temperature coal seam watt
This assay sampler.
Background technique
China is a coal resources big country, while being also that coal production and consumption big country, coal are produced in non-renewable energy
77% and 66% are accounted for respectively with specific gravity in consumption.With the exploitation of coal resources, superficial part resource is petered out, and is gradually increased to deep
The dynamics of exploitation.Deep mining coal seam gas-bearing capacity is big, gas emission increased dramatically therewith, and gas exceeding limit, coal and gas are prominent
Out phenomena such as, is serious.
Coal seam gas-bearing capacity be mine gas diaster prevention and control, coal-bed gas take out in advance recruitment evaluation, coal bed gas resource evaluation and
The important parameter of the related fieldss such as exploitation.Revise and implement in conjunction with China's actual conditions " coal seam gas-bearing capacity underground is directly square
Method ", according to latest national standards, coal mine underground coal bed gas bearing capacity measurement must be effective fixed using core sample method or other verifyings
Point sampling method, and require to complete sampling within 5 minutes.The same year, " prevention and treatment coal and gas prominent regulation " issuing and implementation, it is indicated that
Coal-bed gas is one of coal and gas prominent danger forecasting, the key index of region gas preventing and control validity check.
Currently, coal seam gas-bearing capacity Direct Determination mainly uses desorption method, mainly by three big steps, the first step be
Newly exposed coal wall, crossdrift or stone head is drilled samples of coal pulled；Second step is the coal seams gas discharging quantity measurement of coal sample；Third step
It is laboratory residual gas assay.Current two, three steps are theoretical mature, and the influence to gas bearing capacity measured value can be ignored.By
It is related to the calculating of spot sampling mode and gas loss amount in the first step, is the main source of gas bearing capacity measured value error.It is existing
The common sampling mode in underground be that core sample method sampling and hell connect the spot sampling of sample method.
The technical solution of the prior art one:
Coring tube method: drilling tool is quickly exited after tube sample boring construction and send corer to bottom hole and creeps into coring, sampling
When by corer and coal seam friction drilling complete sampling, sampling complete backed off after random drilling rod simultaneously take out coal sample be packed into speciality coal
In tank.This method can be truly realized spot sampling, however there are following 4 drawbacks: 1. sampling is time-consuming uses much larger than to sampling
When regulation no more than 5 min;2. the exposure for a long time of taken coal sample one end, coal core pipe and coal seam frictional heat generation can cause coal sample
Temperature raising leads to the problem of rotten, acceleration coal sample desorption of mash gas;3. drilling construction is finished to coal core pipe and is sent to the time of bottom hole
In section, bottom hole target coal sample section gas has started loss, and gas loss amount at this time does not consider the gas of taken coal sample
In loss amount;4. borehole stability is poor in weak seam, application of the coal core pipe sampling method in weak seam is poor.
Aperture sampling method:
The process that aperture connects sample method is, distinguished and admirable through press-in hole bottom inside drilling rod and to carry drill bit after construction drill to design position
The slack coal to fall off is transported to aperture, the slack coal being discharged when receiving a certain amount of drilling using the coal sample tank of speciality, and the company of tightening rapidly
It connects desorption instrument and carries out site desorption.This method is easy to operate, sampling is rapid, it is lower easily cause to sample to drill hole sampling it is unsmooth；However,
The maximum defect that aperture connects sample is that acquired coal sample purity is not high, and " sample mixing " phenomenon is serious.
The common drilling rod of underground coal mine mainly has smooth surface drilling rod, auger stem and Three-edged drill stem, and wherein smooth surface drilling rod is main
It applies in hard coal seam;Auger stem and Three-edged drill stem are mainly used in weak seam.It is dynamic as deslagging using down-hole high pressure water flow
When power, water flow and the larger coal slime that is also easy to produce of thinner slack coal contact area are wrapped in drilling rod and hole wall, slagging channel reduce until
Drilling accident occurs, therefore mainly uses wind power slag-discharging at present.
By in sampling, the rotation of drilling rod is in slack coal in rising-decline-delay circulation, part slack coal is detained hole
It is interior as fresh slack coal flows out, therefore the connect coal sample in aperture equally includes exposure duration unknown coal sample, that is, taken coal sample is pure
It spends low, spot sampling can not be truly realized.
Auger stem sampling is by the flight being welded on drilling-rod external wall as the rotation of drilling rod forms screw rail
Mark simultaneously accesses underground pressure air inside drilling rod, forms mechanical, fluid deslagging community.There is also slack coal be detained hole in and drilling rod
Scrape hole wall slack coal phenomenon.This kind of sampling mode equally exist sampling purity it is low, can not real spot sampling the defects of.
The shortcomings that prior art:
Currently, existing, there are two types of common coal seam gas-bearing capacity measurement sampling modes there are certain drawbacks.It is summarized as follows:
Coal core pipe is sampled, it is time-consuming much larger than the regulation for being no more than 5 min to the sampling used time to be primarily present 1. sampling;2. institute
Coal sample one end is taken to expose for a long time, coal core pipe and coal seam frictional heat generation can cause the raising of coal sample temperature to generate rotten, acceleration coal sample
The problem of desorption of mash gas;3. drilling construction is finished to coal core pipe and sent to the period of bottom hole, bottom hole target coal sample section gas is
Start loss, and gas loss amount at this time is not considered in the gas loss amount of taken coal sample;4. drilling in weak seam
Stability is poor, and application of the coal core pipe sampling method in weak seam is poor.
Sample method is connect for aperture, relies primarily on wind-force or auger stem row's coal sample to aperture, both methods is maximum
Drawback is that sample position is uncertain, and " sample mixing " is serious.In sampling process, drilling machine is quickly rotated, is shaken, and causes sampling drilling rod
Hole wall and aperture are ceaselessly impacted, a part of coal sample comes from hole wall or aperture；Another part coal sample, not from bore inner
The cinder drained.Since bore inner has cinder originally before sampling, it is difficult its whole to be drained and then taken the coal sample of constant depth,
So taken coal sample some be the cinder not drained early period.
Therefore, how a kind of safe operation is provided, realizes fixed point, low temperature, sampling below atmospheric pressure, guarantees the purity of sampling, is reduced
Probe temperature reduces coal body desorption gas rate and Coal Oxidation Velocity simultaneously, improves the accurate of coal seam gas-bearing capacity test
Property the features such as negative pressure low temperature coal seam gas-bearing capacity measurement sampler the problem of being those skilled in the art's urgent need to resolve.
Summary of the invention
In view of this, the present invention provides one kind to have accurate spot sampling, sampling purity is high, effectively improves coal-bed gas
The negative pressure low temperature coal seam gas-bearing capacity of the features such as content measuring accuracy measures sampler.
To achieve the above object, the invention provides the following technical scheme:
A kind of negative pressure low temperature coal seam gas-bearing capacity measures sampler, the device mainly includes: drill bit, drilling rod, sampler with
And drilling machine；Wherein, screw thread, plug and socket connection are used between drilling rod and drill bit, between drilling rod and drilling rod, to guarantee the accuracy being coupled
With reliability；The sampler is internally provided with rotary coupling, and one end of the rotary coupling is connect with drilling rod, another
End is connected with shaft, the shaft and rotary coupling by sealing bearing seal inside sampler；The drilling machine output
Rotary power the shaft of sampler body interior is inputed to by shaft coupling, the shaft rotation drives rotary coupling, and
Power is continued to the drilling rod for being transmitted to shaft coupling and front forward, and drill bit is driven to creep into；It is characterized by further comprising: described
The upper end of sampler is provided with a liquid nitrogen injection hole and compressed gas access port；Compressed air by compressed gas access port into
Enter, drive the motor inside sampler, power is transmitted to pumping negative system by transmission shaft, realizes sampling below atmospheric pressure by motor；
The liquid nitrogen injection hole being arranged on sampler injects micro liquid nitrogen to drill bit in drilling process, realizes low temperature sampling.
Preferably, in a kind of above-mentioned negative pressure low temperature coal seam gas-bearing capacity measurement sampler, the drill bit is using high-strength
The alloy steel material of degree, high rigidity.
Preferably, in a kind of above-mentioned negative pressure low temperature coal seam gas-bearing capacity measurement sampler, the drilling rod 2 is fried dough twist spiral shell
Bar, using stainless steel material, hollow, external helicoid shape, every section run of steel is 1.5m.
Preferably, in a kind of above-mentioned negative pressure low temperature coal seam gas-bearing capacity measurement sampler, the drilling rod front end setting
Four sampling windows are the square sample mouth that length is 3cm, width is 2cm；Sampling is equipped on the sampling window
Switch, opens sampling window when needing to sample, guarantee that samples taken can be pumped negative pressure system along drilling rod and be drawn to coal sample and take
Sample mouth.
Preferably, in a kind of above-mentioned negative pressure low temperature coal seam gas-bearing capacity measurement sampler, on the coal sample sample tap
It is connected with for missing the sampling sieve pore for being less than 2mm coal dust.
Preferably, in a kind of above-mentioned negative pressure low temperature coal seam gas-bearing capacity measurement sampler, the compressed gas access
Two-way Steering valve is installed on mouthful, screwing the two-way Steering valve connects compressed air and motor.
Preferably, in a kind of above-mentioned negative pressure low temperature coal seam gas-bearing capacity measurement sampler, in the sampler and
Drilling machine lower end is mounted on stabilizer blade.
Preferably, in a kind of above-mentioned negative pressure low temperature coal seam gas-bearing capacity measurement sampler, the sampler can be connect
Enter drilling machine, drilling rod middle part；Or individually remove, only use drilling machine, drilling rod is crept into forward.
It can be seen via above technical scheme that compared with prior art, present invention is mainly used for measurement coal seam gas-bearing capacitys
When accurate spot sampling, low temperature sampling, effectively raise the purity of sampling, reduce coal borer bits high-temperature oxydation rate and
The rate that gas is desorbed under high temperature keeps coal seam gas-bearing capacity measurement more acurrate, provides for mine gas prevention and control relatively reliable
Scientific basis.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention for those of ordinary skill in the art without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 attached drawing is structural schematic diagram of the invention.
Fig. 2 attached drawing is sampler agent structure schematic diagram of the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The embodiment of the invention discloses one kind to have accurate spot sampling, sampling purity is high, effectively improves coal-bed gas contains
The negative pressure low temperature coal seam gas-bearing capacity for the features such as measuring test accuracy measures sampler.
Attached drawing 1, attached drawing 2 are please referred to, is that a kind of negative pressure low temperature coal seam gas-bearing capacity disclosed by the invention measures sampler,
It specifically includes:
Drill bit 1, drilling rod 2, sampler 3 and drilling machine 4；Wherein, it is used between drilling rod 2 and drill bit 1, between drilling rod 2 and drilling rod 2
Screw thread, plug and socket connection, to guarantee the accuracy and reliability that are coupled；The sampler 3 is internally provided with rotary coupling 31,
One end of the rotary coupling 31 is connect with drilling rod 2, and the other end is connected with shaft 32, the shaft 32 and rotary coupling 31
It is sealed in inside sampler 3 by sealing bearing 33；The rotary power that drilling machine 4 exports inputs to sampling by shaft coupling 311
Shaft 32 inside device main body 3, the rotation of shaft 32 drives rotary coupling 31, and power continuation is transmitted to forward shaft coupling
311 with the drilling rod 2 in front, and drill bit 1 is driven to creep into；It is characterized by further comprising: being arranged in the upper end of the sampler 3
There are a liquid nitrogen injection hole 34 and compressed gas access port 35；Compressed air is entered by compressed gas access port 35, is passed to and is taken
Power is transmitted to pumping negative system 38 by transmission shaft 37 by the motor 36 inside sampling device 3, motor 36, and compressed air passes through pressure
Contracting gas access port 35 enters, and drives the motor 36 inside sampler 3, and power is transmitted to pump by transmission shaft 37 and inhaled by motor 36
Negative pressure system 38 realizes sampling below atmospheric pressure；The liquid nitrogen injection hole 34 being arranged on sampler 3, injects micro liquid in drilling process
Nitrogen realizes low temperature sampling to drill bit；In drilling, liquid nitrogen is by the micro injection of liquid nitrogen inlet 34, and liquid nitrogen is along hollow drilling rod 2
Drill bit position is reached, is cooled to drill bit.
A kind of negative pressure low temperature coal seam gas-bearing capacity measurement device disclosed by the invention, to realize that coal seam gas-bearing capacity measures
Accurate fixed point, low temperature sampling in the process, mainly include following following aspect:
1, it accurate spot sampling: during drilling, is combined by twist drill rods deslagging, wind power slag-discharging, drains coal in hole
Drilling cuttings；
2, low temperature sampling: in drilling process, by injecting micro liquid nitrogen, along hollow drilling rod, cool down to drill bit；
3, sampling below atmospheric pressure: when drilling machine is crept into predetermined depth, motor system is utilized to drive pump desorption system, the air-flow of generation carries coal
Drilling cuttings, to sampler main body, improves the purity of sampling inside hollow drilling rod；
4, this covering device is integration apparatus, especially sampler main body, while realizing injection liquid nitrogen cooling function, drilling
The distinguished and admirable blowout coal borer of process considers function, the drilling rod central negative pressure sampled functions of sampling process to be worth doing, effectively raises coal-bed gas and contains
Measure the accuracy of examination.
In order to further optimize the above technical scheme, the drill bit 1 is using high-intensitive, high rigidity alloy steel material.
In order to further optimize the above technical scheme, the drilling rod 2 is fried dough twist screw rod, using stainless steel material, hollow, outside
Portion is spiral-shaped, and every section run of steel is 1.5m.
In order to further optimize the above technical scheme, four sampling windows 21 are arranged in 2 front end of drilling rod, are for length
3cm, the square sample mouth that width is 2cm；It is equipped with sampling switch 22 on the sampling window 21, opening when needing to sample
Sampling window 21 guarantees that samples taken can be pumped negative pressure system 38 along drilling rod 2 and be drawn to coal sample sample tap 23.
In order to further optimize the above technical scheme, it is connected on the coal sample sample tap 23 and is less than 2mm coal for missing
The sampling sieve pore 24 of powder.
In order to further optimize the above technical scheme, two-way Steering valve is installed on the compressed gas access port 35
39, screwing the two-way Steering valve 39 connects compressed air and motor 26.
In order to further optimize the above technical scheme, stabilizer blade 5 is mounted in the sampler 3 and 4 lower end of drilling machine.
In order to further optimize the above technical scheme, the sampler 3 can access drilling machine 1,2 middle part of drilling rod；Or it is single
It solely removes, only uses drilling machine 1, drilling rod 2 is crept into forward, i.e., shaft coupling 311 is fast interface.
In order to further optimize the above technical scheme, specific embodiment are as follows:
(1) position of drilling is selected, mainly coal seam is than more complete, without being drilling accurate location at the dirt band of coal seam；
(2) in the following order: drill bit, drilling rod, sampler main body, drilling machine install a whole set of drive sampling device；It is connect for drilling machine
Drifting compressed air gas source (power)；Compressed gas source is connected for sampler main body, and adjusts two-way switching valve, keeps compression empty
Gas flows to bit head position inside drilling rod；
(3) underground compressed air gas source is opened, starts to drill；Compressed gas source is opened for sampler main body, coal dust is along fried dough twist
Outside drilling rod, power is carried by twist drill rods spiral force, compressed gas, is discharged from aperture；Simultaneously from the liquid of sampler main body
Nitrogen injection hole enters micro liquid nitrogen, and liquid nitrogen is along the distinguished and admirable purpose for carrying inside drilling rod and playing to drill bit and cooling down to drill bit；
(4) after first drilling rod is completely into coal body, drilling machine gas source is closed, closes sampler main body gas source, stops injection
Micro liquid nitrogen；From shaft coupling, sampler main body and drilling machine part are pulled out, new access 1.5m twist drill rods one.It beats again
Gas source, liquid nitrogen injection are opened, continues to creep into；
(5) repeat the above steps the process of (4), until drilling is to predetermined depth (general depth selection 15m)；
(6) dally drilling rod, continue to use compressed air consider coal borer in hole in whole taps to be worth doing；
(7) two-way switching valve is screwed, compressed air and motor system are connected；Drilling machine continuation is crept into forward；At this point, motor system
Pumping negative system is driven, the pump housing starts turning generation negative pressure, and negative pressure promotes air-flow to flow to sampler main body from drill bit；It bores
The coal borer bits that head is hit down carry inside hollow drilling rod to rotary coupling by drilling rod front end sampling window, by mass air flow
Place, is brought by pump to sample tap, and the coal dust less than 2mm is filtered out by sampling sieve pore；
(8) it is sampled and is equipped with coal seam gas-bearing capacity, coal borer bits are picked up at sample tap, until sampling is completed.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest scope of cause.
Claims (8)
1. a kind of negative pressure low temperature coal seam gas-bearing capacity measures sampler, the device mainly includes: drill bit, drilling rod, sampler
And drilling machine；Wherein, screw thread, plug and socket connection are used between drilling rod and drill bit, between drilling rod and drilling rod, to guarantee the precision being coupled
Property and reliability；The sampler is internally provided with rotary coupling, and one end of the rotary coupling is connect with drilling rod, separately
One end is connected with shaft, the shaft and rotary coupling by sealing bearing seal inside sampler；The drilling machine is defeated
Rotary power out inputs to the shaft of sampler body interior by shaft coupling, and the shaft rotation drives rotary coupling,
And power is continued to the drilling rod for being transmitted to shaft coupling and front forward, and drill bit is driven to creep into；It is characterized by further comprising: institute
The upper end for stating sampler is provided with a liquid nitrogen injection hole and compressed gas access port；Compressed air passes through compressed gas access port
Into driving the motor inside sampler, power is transmitted to pumping negative system by transmission shaft by motor, realization negative pressure taking
Sample；The liquid nitrogen injection hole being arranged on sampler injects micro liquid nitrogen to drill bit in drilling process, realizes low temperature sampling.
2. a kind of negative pressure low temperature coal seam gas-bearing capacity according to claim 1 measures sampler, which is characterized in that described
Drill bit is using high-intensitive, high rigidity alloy steel material.
3. a kind of negative pressure low temperature coal seam gas-bearing capacity according to claim 2 measures sampler, which is characterized in that described
Drilling rod 2 is fried dough twist screw rod, and using stainless steel material, hollow, external helicoid shape, every section run of steel is 1.5m.
4. a kind of negative pressure low temperature coal seam gas-bearing capacity according to claim 3 measures sampler, which is characterized in that described
Four sampling windows are arranged in drilling rod front end, are the square sample mouth that length is 3cm, width is 2cm；In the sampling window
On be equipped with sampling switch, open sampling window when needing to sample, guarantee that samples taken can be pumped negative pressure system along drilling rod
System is drawn to coal sample sample tap.
5. a kind of negative pressure low temperature coal seam gas-bearing capacity according to claim 4 measures sampler, which is characterized in that described
It is connected on coal sample sample tap for missing the sampling sieve pore for being less than 2mm coal dust.
6. a kind of negative pressure low temperature coal seam gas-bearing capacity according to claim 5 measures sampler, which is characterized in that described
Two-way Steering valve is installed, screwing the two-way Steering valve connects compressed air and motor on compressed gas access port.
7. a kind of negative pressure low temperature coal seam gas-bearing capacity according to claim 6 measures sampler, which is characterized in that in institute
It states sampler and drilling machine lower end is mounted on stabilizer blade.
8. a kind of negative pressure low temperature coal seam gas-bearing capacity according to any one of claims 1-7 measures sampler,
It is characterized in that, the sampler can access drilling machine, drilling rod middle part；Or individually remove, only use drilling machine, drilling rod bores forward
Into.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110566147A (en) * | 2019-09-06 | 2019-12-13 | 西安科技大学 | Equipment and method for adopting coal core for low-temperature gas medium cooling drill bit |
| CN111649979A (en) * | 2020-06-12 | 2020-09-11 | 煤科集团沈阳研究院有限公司 | Nitrogen low-temperature positive-pressure remote rapid gas content sampling device and method |
| 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 |
| CN115824701A (en) * | 2022-12-22 | 2023-03-21 | 太原理工大学 | Impact type coal seam fixed-point nondestructive sampling device and method while drilling |
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