CN209485791U - 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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- CN209485791U CN209485791U CN201822183675.0U CN201822183675U CN209485791U CN 209485791 U CN209485791 U CN 209485791U CN 201822183675 U CN201822183675 U CN 201822183675U CN 209485791 U CN209485791 U CN 209485791U
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- sampler
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- negative pressure
- sampling
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Abstract
The utility model 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 utility model 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 utility model relates to coal seam gas-bearing capacity determination techniques field, more particularly to a kind of negative pressure low temperature coal
Layer gas bearing capacity measures 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: quickly exiting drilling tool and send corer to bottom hole and creep into coring after tube sample boring construction,
Friction when sampling by corer and coal seam, which is crept into, completes sampling, and sampling completes backed off after random drilling rod and takes out coal sample loading speciality
Coal tank in.This method can be truly realized spot sampling, however there are following 4 drawbacks: 1. sampling is time-consuming much larger than to taking
The sample used time is no more than the regulation of 5 min;2. exposure, coal core pipe can cause with coal seam frictional heat generation for a long time for taken coal sample one end
The raising of coal sample temperature 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 bottom hole
In period, bottom hole target coal sample section gas has started loss, and gas loss amount at this time does not consider taken coal sample
In gas 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 after construction drill to design position
The slack coal that drill bit falls 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 twists rapidly
It is tightly connected 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, " 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. 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 to increase, generation is rotten, accelerates
The problem of coal sample desorption of mash gas;3. drilling construction is finished to coal core pipe and is sent to the period of bottom hole, bottom hole target coal sample section watt
This has started loss, and gas loss amount at this time is not considered in the gas loss amount of taken coal sample;4. in weak seam
Borehole 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.
Utility model content
In view of this, the present invention provides a kind of with accurate spot sampling, sampling purity is high, effectively improves
The negative pressure low temperature coal seam gas-bearing capacity of the features such as coal seam gas-bearing capacity test accuracy measures sampler.
To achieve the above object, the utility model provides the following technical solutions:
A kind of negative pressure low temperature coal seam gas-bearing capacity measurement sampler, the device mainly includes: drill bit, drilling rod, sampling dress
It sets 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 essence being coupled
Close property and reliability；The sampler is internally provided with rotary coupling, and one end of the rotary coupling is connect with drilling rod,
The other end is connected with shaft, the shaft and rotary coupling by sealing bearing seal inside sampler；The drilling machine
The rotary power of output inputs to the shaft of sampler body interior by shaft coupling, and the shaft rotation drives rotation-coupled
Device, and power continuation is transmitted to forward the drilling rod in shaft coupling and front, and drill bit is driven to creep into；It is characterized by further comprising:
The upper end of the sampler is provided with a liquid nitrogen injection hole and compressed gas access port；Compressed air is accessed by compressed gas
Mouth enters, and drives the motor inside sampler, and power is transmitted to pumping negative system by transmission shaft, realizes negative pressure taking by motor
Sample；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, the utility model is mainly used for measuring coal-bed gas
Accurate spot sampling when content, low temperature sampling effectively raise the purity of sampling, reduce coal borer bits high-temperature oxydation rate
And the rate of gas is desorbed under high temperature, keep coal seam gas-bearing capacity measurement more acurrate, provides for mine gas prevention and control and more may be used
The scientific basis leaned on.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is the embodiments of the present invention, for those of ordinary skill in the art, without creative efforts, also
Other attached drawings can be obtained according to the attached drawing of offer.
Fig. 1 attached drawing is the structural schematic diagram of the utility model.
Fig. 2 attached drawing is the sampler agent structure schematic diagram of the utility model.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
The utility model embodiment, which discloses one kind, to be had accurate spot sampling, sampling purity is high, effectively improves coal seam watt
The negative pressure low temperature coal seam gas-bearing capacity of the features such as this content measuring accuracy measures sampler.
Attached drawing 1, attached drawing 2 are please referred to, for a kind of negative pressure low temperature coal seam gas-bearing capacity measurement sampling disclosed by the utility model
Device specifically includes:
Drill bit 1, drilling rod 2, sampler 3 and drilling machine 4；Wherein, between drilling rod 2 and drill bit 1, between drilling rod 2 and drilling rod 2
Using screw thread, plug and socket connection, to guarantee the accuracy and reliability that are coupled；The sampler 3 is internally provided with rotation-coupled
One end of device 31, the rotary coupling 31 is connect with drilling rod 2, and the other end is connected with shaft 32, and the shaft 32 joins with rotation
Knot device 31 is sealed in inside sampler 3 by sealing bearing 33；The rotary power that drilling machine 4 exports is inputted by shaft coupling 311
To the shaft 32 inside sampler main body 3, the rotation of shaft 32 drives rotary coupling 31, and power continuation is transmitted to forward
The drilling rod 2 of shaft coupling 311 and front, and drill bit 1 is driven to creep into；It is characterized by further comprising: in the upper of the sampler 3
End is provided with a liquid nitrogen injection hole 34 and compressed gas access port 35；Compressed air is entered by compressed gas access port 35, is passed
The motor 36 inside sampler 3 is passed, power is transmitted to pumping negative system 38, compressed air by transmission shaft 37 by motor 36
Entered by compressed gas access port 35, drive the motor 36 inside sampler 3, motor 36 is passed power by transmission shaft 37
To pumping negative system 38, sampling below atmospheric pressure is realized；The liquid nitrogen injection hole 34 being arranged on sampler 3, injects in drilling process
Micro liquid 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 sky
Core drilling rod 2 reaches drill bit position, cools to drill bit.
A kind of negative pressure low temperature coal seam gas-bearing capacity measurement device disclosed by the utility model, to realize coal seam gas-bearing capacity
Accurate fixed point, low temperature sampling in continuous mode, mainly include following following aspect:
1, it accurate spot sampling: during drilling, is combined by twist drill rods deslagging, wind power slag-discharging, drains hole
Interior coal borer bits；
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, pump desorption system is driven using motor system, the air-flow of generation is taken
Band coal borer bits, to sampler main body, improve the purity of sampling inside hollow drilling rod；
This covering device is integration apparatus, especially sampler main body, while realizing injection liquid nitrogen cooling function, boring
Function, the drilling rod central negative pressure sampled functions of sampling process are considered to be worth doing into the distinguished and admirable blowout coal borer of process, effectively raise coal-bed gas
The accuracy of content measuring.
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；To bore
Machine connects underground compressed air gas source (power)；Compressed gas source is connected for sampler main body, and adjusts two-way switching valve, makes to press
Contracting air flows to bit head position inside drilling rod；
(3) underground compressed air gas source is opened, starts to drill；For sampler main body open compressed gas source, coal dust along
Outside twist drill rods, power is carried by twist drill rods spiral force, compressed gas, is discharged from aperture；Simultaneously from sampler main body
Liquid nitrogen injection hole enter micro liquid nitrogen, 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, is stopped
Inject micro liquid nitrogen；From shaft coupling, sampler main body and drilling machine part are pulled out, new access 1.5m twist drill rods one.Again
Secondary opening gas source, liquid nitrogen injection, continue 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 drives pumping negative system, and the pump housing starts turning generation negative pressure, and negative pressure promotes air-flow to flow to sampler master from drill bit
Body；The coal borer bits that drill bit is hit down are carried inside hollow drilling rod by mass air flow and are extremely rotated by drilling rod front end sampling window
It at hookup, is brought by pump to sample tap, the coal dust less than 2mm is filtered out by sampling sieve pore；
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 can be realized professional and technical personnel in the field or using originally practical new
Type.Various modifications to these embodiments will be readily apparent to those skilled in the art, and determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause
This, the present invention will not be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The widest scope consistent with features of novelty.
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 (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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