CN108896435A - Full-automatic while-drilling gas content rapid determination device - Google Patents
Full-automatic while-drilling gas content rapid determination device Download PDFInfo
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- CN108896435A CN108896435A CN201810793186.9A CN201810793186A CN108896435A CN 108896435 A CN108896435 A CN 108896435A CN 201810793186 A CN201810793186 A CN 201810793186A CN 108896435 A CN108896435 A CN 108896435A
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- 238000005553 drilling Methods 0.000 title claims abstract description 60
- 239000003245 coal Substances 0.000 claims abstract description 127
- 238000004891 communication Methods 0.000 claims abstract description 9
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 7
- 238000005259 measurement Methods 0.000 claims description 40
- 241001074085 Scophthalmus aquosus Species 0.000 claims description 13
- 238000004140 cleaning Methods 0.000 claims description 6
- 230000000712 assembly Effects 0.000 claims description 5
- 238000000429 assembly Methods 0.000 claims description 5
- 238000009826 distribution Methods 0.000 claims description 5
- 238000012216 screening Methods 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims 1
- 238000005070 sampling Methods 0.000 abstract description 16
- 238000013461 design Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 31
- 238000000034 method Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001727 in vivo Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000010408 sweeping Methods 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
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/04—Devices for withdrawing samples in the solid state, e.g. by cutting
- G01N1/08—Devices for withdrawing samples in the solid state, e.g. by cutting involving an extracting tool, e.g. core bit
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a full-automatic while-drilling gas content rapid determination device, which comprises a sampling device, a measuring device and a connecting pipeline, wherein the sampling device is connected with the measuring device through the connecting pipeline; the sampling device comprises a double-arm drill rod, a sampling drill bit arranged at the front end of the double-arm drill rod and a drill tail arranged at the tail part of the double-arm drill rod; a main channel is arranged in the double-arm drill rod, an annular space communicated with the main channel is arranged on the wall of the double-arm drill rod, and an air pressure stabilizing device is arranged on the drill tail; the measuring device comprises a measuring host and a measuring cylinder; a pressure gauge B which is in communication connection with the measuring host and is used for measuring the pressure in the measuring cylinder is arranged on the measuring cylinder; a coal sample cup is arranged in the measuring cylinder, one end of the connecting pipeline is communicated with the tail of the drill tail, and the other end of the connecting pipeline is arranged above the coal sample cup and used for conveying a coal sample to the coal sample cup. According to the invention, through the integrated design of the sampling device and the measuring device, the exposure time of the coal sample in the air and the loss amount of gas in the coal sample are reduced, and the accuracy of the prediction of the gas content of the coal bed is greatly improved.
Description
Technical field
The present invention relates to a kind of automatically with brill gas bearing capacity rapid determination device.
Background technique
Coal and gas prominent is under the collective effect of crustal stress and gas, and broken coal, rock and gas are by coal body or rock
The abnormal dynamic phenomenon dished out suddenly to digging space in vivo is the powerful natural calamity of one kind of underground coal mine production, sternly
It threatens the safety in production of coal mine again, has greatly destructive.
The accurate Coal and Gas Outbursts Prediction of science, instructs coal and gas outburst prominent controlling measure rationally and effectively to implement
Premise and key point, therefore, Coal and Gas Outbursts Prediction is of great immediate significance.Coal seam gas-bearing capacity is coal and gas
One of key index outstanding is widely used in recent years on forecasting coal and gas outburst risk.
The core of the miniature row of Gas Content Prediction in Coal Seam coal and gas prominent is how quickly and correctly to measure coal seam watt
This content, around this core, the research of scholar both domestic and external is concentrated mainly on：1. pinpointing fast sampling；2. coal-bed gas
Content measurement device and method.The sampling and measurement of coal seam gas-bearing capacity measurement at this stage are individual devices, and it is most of by
Technical staff has been manually done measurement, and which results in the overlong time that coal sample is leaked cruelly in air, gas loss amount is big, leads to coal seam
Deviation is excessive between gas bearing capacity determination data and actual value, affects the judgement of coal and gas prominent risk.
Summary of the invention
The object of the present invention is to provide a kind of automatically with gas bearing capacity rapid determination device is bored, to solve existing coal seam watt
Coal sample leaks that the time is long, the big problem of gas loss in coal sample cruelly during this assay.
In order to solve the above technical problems, the present invention provides one kind automatically with brill gas bearing capacity rapid determination device, including
Sampler, measuring device and connecting pipe；The sampler includes both arms drilling rod, the both arms drilling rod front end is arranged in
Chisel bit and the drilling tail in both arms drilling rod tail portion is set；Main channel, the bar wall of both arms drilling rod are equipped in the both arms drilling rod
It is equipped with the annular space being connected to the main channel, the drilling tail is equipped with air pressure stable-pressure device；The measuring device includes
Measure host and measuring cylinder；It is equipped in the measuring cylinder and is used to measure the measurement with what the measurement main-machine communication was connect
The pressure gauge B of pressure in cylinder；Coal sample cup, the tail portion company of one end of the connecting pipe and the drilling tail are equipped in the measuring cylinder
Logical, the other end is placed in the top of the coal sample cup for conveying coal sample into coal sample cup.
Further, the bottom of measuring cylinder is equipped with the electrically operated valve A connecting with the measurement main-machine communication, the coal sample cup
Bottom is equipped with the electrically operated valve C of the measurement main-machine communication connection.
Further, the side wall of measuring cylinder is equipped with filter device；The filter device includes the side that measuring cylinder is arranged in
Screen assemblies are installed on the inside of the electrically operated valve B connecting on wall and with the measurement main-machine communication, electrically operated valve B.
Further, the screen assemblies include the internal layer filter screen, intermediate filtered net and outer layer mistake being successively set side by side
Strainer, the outer filter net are disposed in proximity to the side of the electrically operated valve B, and the internal layer filter screen is disposed in proximity to described
The side of coal sample cup；And the aperture of the internal layer filter screen is 3mm, the aperture of intermediate filtered net is 2mm, the hole of outer filter net
Diameter is 1mm.
Further, the image acquisition device for samples of coal pulled size distribution is installed below the electrically operated valve A.
Further, described image acquisition includes the multiple cameras being arranged in below the measuring cylinder, and multiple described
Camera shooting is circularly and evenly distributed in the lower section of the electrically operated valve A.
Further, the top of the coal sample cup is equipped with the coal sample cleaning dress for removing extra coal sample above coal sample cup
It sets, the coal sample cleaning plant includes being horizontally set on coal sample brush at the top of the coal sample cup, subtracting with what the coal sample brush was connect
Fast device and the micro-step motor being connect with the retarder.
Further, the air pressure stable-pressure device includes the pressure stabilizing pipeline of the drilling tail connection, is set on the pressure stabilizing pipeline
There is pressure gauge A, the side that the pressure gauge A is connect with drilling tail is equipped with aperture adjustable ball valve, and the pressure gauge A is separate to be connected with drilling tail
The one end connect is equipped with air pressure regulator.
Further, the pressure gauge A and pressure gauge B is intelligent voltage table, passes through bluetooth and measurement host connects
It connects.
Beneficial effects of the present invention are：The present invention is by by sampler and measuring device integrated design, and by measuring
Host controls sampling progress and measurement progress, reduces the intervention artificially to sampling and measurement, shortens time of measuring, realize
With boring with the loss amount for reducing gas in coal sample aerial sudden and violent leakage time and coal sample with survey is taken, coal is greatly improved
The accuracy of layer Gas content prediction.
Detailed description of the invention
The drawings described herein are used to provide a further understanding of the present application, constitutes part of this application, at this
The same or similar part, the illustrative embodiments and their description of the application are indicated using identical reference label in a little attached drawings
For explaining the application, do not constitute an undue limitation on the present application.In the accompanying drawings：
Fig. 1 is the structural schematic diagram of one embodiment of the invention；
Fig. 2 is the structural schematic diagram of the measuring cylinder of one embodiment of the invention.
Wherein：1, chisel bit；2, both arms drilling rod；3, clamper；4, air pressure regulator；5, pressure gauge A；6, drilling machine；7,
Aperture adjustable ball valve；8, drilling tail；9, host is measured；10, measuring cylinder；11, camera；12, pressure gauge B；13, electrical ball valve；14,
Coal sample brush；15, retarder；16, micro-step motor；17, electrically operated valve A；18, electrically operated valve B；19, screen assemblies；20, coal
Sample cup；21, electrically operated valve C；A, main channel；B, annular space.
Specific embodiment
As shown in Figure 1 is full-automatic with brill gas bearing capacity rapid determination device, including sampler, measuring device and connection
Pipeline；Various components are described in detail separately below：
The sampler includes the both arms drilling rod 2 being fixed on the rack by clamper 3, is arranged in the both arms drilling rod
The chisel bit 1 of 2 front ends and the drilling tail 8 in 2 tail portion of both arms drilling rod is set；Both arms drilling rod 2 is driven by drilling machine 6, and both arms bore
Main channel A is equipped in bar 2, the bar wall of both arms drilling rod 2 is equipped with the annular space B being connected to the main channel A, the drilling tail 8
It is equipped with air pressure stable-pressure device.The air pressure stable-pressure device includes the pressure stabilizing pipeline that the drilling tail 8 is connected to, on the pressure stabilizing pipeline
Equipped with pressure gauge A5, the side that the pressure gauge A5 is connect with drilling tail 8 is equipped with aperture adjustable ball valve 7, and the pressure gauge A5 is separate
The one end connecting with drilling tail 8 is equipped with air pressure regulator 4.Wherein, pressure gauge A5 uses intelligent manometer, passes through bluetooth and measurement
Host 9 connects.
Heretofore described both arms drilling rod 2 is existing drilling rod, is the drilling rod generallyd use when current each coal mine sampling,
Such as 73 both arms self-sealing drilling rod of Φ.And both arms drilling rod 2 is deriving diversified forms at present, as trigone both arms bore
Bar, the wide blade screw both arms drilling rod of whole notch type etc..The common feature of such both arms drilling rod is：Drilling rod has two layers, i.e.,
Outer tube and inner tube.And the hollow channel of inner tube forms main channel, inner and outer tubes form annular space.It is main logical when normal drilling
Road air inlet；When sampling, annular space air inlet, coal sample is discharged to aperture from main channel.What the both arms drilling rod in the present invention was not fixed
Pattern requirement, that is to say, that the technology is all suitable for for that can form all kinds of drilling rods of main channel and annular space.And general skill
Art personnel will also understand that the drilling rod for changing type.
When the present invention is normally crept into, entered the wind by the main channel A being arranged on both arms drilling rod 2；When sampling, by described
2 annular space B of both arms drilling rod air inlet, coal sample enter measuring cylinder through the drilling tail 8 by main channel A on the both arms drilling rod 2
10, and the aperture adjustable ball valve 7 being connected in the drilling tail 8 adjusts intake according to the depth of drilling, air pressure regulator 4 is protected
The stability for flowing to the air pressure of the aperture adjustable ball valve 7 is demonstrate,proved.
As shown in Fig. 2, the measuring device includes measurement host 9 and measuring cylinder 10；It is equipped in the measuring cylinder 10
The pressure gauge B12 for being used to measure pressure in the measuring cylinder 10 communicated to connect with the measurement host 9, the bottom of measuring cylinder 10
Equipped with the electrically operated valve A17 communicated to connect with the measurement host 9；Wherein, intelligent micro-pressure pressure gauge can be used in pressure gauge B12,
And intelligent micro-pressure pressure gauge is connect by bluetooth with measurement host 9.
The coal sample cup 20 for containing coal sample, one end of the connecting pipe and the drilling tail are equipped in the measuring cylinder 10
8 tail portion connection, the other end are placed in the top of the coal sample cup 20 for conveying coal sample into coal sample cup 20, set in connecting pipe
There is electrical ball valve 13,；20 bottom of coal sample cup is equipped with the electrically operated valve C21 that the measurement host 9 communicates to connect, described
Electrically operated valve C21 is in close state when connecing sample and measurement, and after being measured, the electrically operated valve C21 is automatically turned on, just
Sample is connect in what the coal sample cup 20 continued next circulation.
In sampling, the electrically operated valve A17 is in the open state.The valve C of 20 bottom of coal sample cup, which is in, closes shape
State, at this point, the coal sample into the measuring cylinder 10 largely enters the coal sample cup 20, when the coal sample cup 20 fills coal sample
When, most coal sample is fallen from the electrically operated valve A17 of the coal sample cylinder bottom, when there is a large amount of coal sample to fall,
Illustrate that coal sample is already filled with the coal sample cup 20.At this point, being closed by the aperture adjustable ball valve 7 that measurement host 9 controls
It closes, and stops creeping into.
After coal sample enters the coal sample cup 20, the measuring cylinder 10 is in the state being fully sealed, at this point, coal sample is opened
Begin to desorb, the gas after desorption causes the variation of 10 pressure of measuring cylinder, by the intelligent micro-pressure being connected on the coal sample cylinder
The pressure of measuring cylinder 10 described in gauge measurement, and data are passed through in Bluetooth transmission to the measurement host 9, it is described
Measurement host 9 calculates coal seam gas-bearing capacity and shows final measurement result.
The side wall of measuring cylinder 10 is equipped with filter device；The filter device include be arranged on the side wall of measuring cylinder 10 and
Screen assemblies 19 are installed on the inside of the electrically operated valve B18 communicated to connect with the measurement host 9, electrically operated valve B18；The sieve
Screen component 19 includes internal layer filter screen, intermediate filtered net and the outer filter net being successively set side by side, and the outer filter net is set
It is disposed adjacent to the side of the electrically operated valve B18, the internal layer filter screen is disposed in proximity to the side of the coal sample cup 20；And institute
The aperture for stating internal layer filter screen is 3mm, and the aperture of intermediate filtered net is 2mm, and the aperture of outer filter net is 1mm.The screening group
Part 19 can sufficiently filter out the coal sample not fallen in the coal sample cup 20 when sampling and not have effective diameter to measurement
Coal sample less than 1mm.When sampling, the electrically operated valve B18 of 10 side of measuring cylinder is in the open state, convenient for blowing away from side
Diameter is in 1mm coal sample below.
Image acquisition device for samples of coal pulled size distribution is installed below the electrically operated valve A17；Described image is adopted
Collection includes the multiple cameras 11 being arranged in below the measuring cylinder 10, and multiple camera shootings are circularly and evenly distributed described
The lower section of electrically operated valve A17, and the camera 11 is controlled by the measurement host 9.After completing measurement, the coal sample is opened
The electrically operated valve C21 of 20 bottoms of cup, under coal sample is grown from the electrically operated valve C21 of the coal sample cylinder bottom, through described three
Camera 11 detects the coal sample size regularity of distribution, and is stored in measurement host 9.In addition, can also pass through camera in sampling
11 detection coal breakage amounts, further by measuring host 9 judges whether coal sample is already filled in measuring cup.
The top of the coal sample cup 20 is equipped with the coal sample cleaning plant for removing the 20 extra coal sample in top of coal sample cup, described
Coal sample cleaning plant includes the coal sample brush 14 for being horizontally set on 20 top of coal sample cup, the deceleration connecting with the coal sample brush 14
Device 15 and the micro-step motor 16 being connect with the retarder 15.When detect have been filled with coal sample in coal sample cup 20 after, open
Actuating miniature stepper motor 16 drives coal sample brush 14 to be close to the 20 top edge sweeping action one of coal sample cup by retarder 15
It is secondary, remove extra coal sample on the coal sample cup 20, the amount of the coal sample contained every time so as to the coal sample cup 20 is consistent.
Using above-mentioned coal seam gas-bearing capacity with boring with taking the rapid determination device with survey to carry out coal seam gas-bearing capacity measurement
It operates as follows：
S1：It is installed in presumptive area automatically with gas bearing capacity rapid determination device is bored, according to general drilling method,
It applies and gets into scheduled sample position.
S2：The electrically operated valve A17 of 10 bottom of measuring cylinder, the electrically operated valve B18 of side are opened, electrical ball valve 13 is opened, from
4 interface of air pressure regulator is passed through mine compressed air, adjusts the aperture of aperture adjustable ball valve 7, and starts drilling machine 6, at this point, coal sample passes through
Drilling tail 8 enters coal sample cup 20, when coal sample cup 20 fills coal sample, closes drilling machine 6, stops the gas supply at air pressure regulator 4, closing is opened
Spend adjustable ball valve 7 and electrical ball valve 13；Close electrically operated valve B18.Coal sample brush 14 is opened, after brushing off extra coal sample, closes electricity
Movable valve A17.
S3：By the pressure of the intelligent micro-pressure pressure gauge B12 measurement measuring cylinder 10, and data are passed through into Bluetooth transmission
To on measurement host 9.The electrically operated valve C21 and measuring cylinder 10 of 20 bottom of coal sample cup are opened after the desorption of 5~15min
The electrically operated valve A17 of bottom measures coal sample size distribution situation by three cameras 11, and calculates coal seam watt by measurement host 9
This content.
S4：It after completing the measurement in a region, repeats the above steps, continues to measure next regional coal-seam gas and contain
Amount.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to compared with
Good embodiment describes the invention in detail, those skilled in the art should understand that, it can be to skill of the invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of technical solution of the present invention, should all be covered at this
In the scope of the claims of invention.
Claims (9)
1. a kind of automatically with brill gas bearing capacity rapid determination device, which is characterized in that including sampler, measuring device and company
Adapter tube road；
The sampler includes that both arms drilling rod, the chisel bit that the both arms drilling rod front end is arranged in and setting are bored in both arms
The drilling tail of bar tail portion；It is equipped with main channel in the both arms drilling rod, the bar wall of both arms drilling rod is equipped with to be connected to the main channel
Annular space, the drilling tail are equipped with air pressure stable-pressure device；
The measuring device includes measurement host and measuring cylinder；It is equipped in the measuring cylinder and connects with the measurement main-machine communication
What is connect is used to measure the pressure gauge B of pressure in the measuring cylinder；It is equipped with coal sample cup in the measuring cylinder, the one of the connecting pipe
End is connected to the tail portion of the drilling tail, and the other end is placed in the top of the coal sample cup for conveying coal sample into coal sample cup.
2. according to claim 1 automatically with brill gas bearing capacity rapid determination device, which is characterized in that the bottom of measuring cylinder
Portion is equipped with the electrically operated valve A connecting with the measurement main-machine communication, and coal sample bottom of a cup portion is equipped with the measurement main-machine communication
The electrically operated valve C of connection.
3. according to claim 1 automatically with brill gas bearing capacity rapid determination device, which is characterized in that the side of measuring cylinder
Wall is equipped with filter device；The filter device includes being arranged on the side wall of measuring cylinder and connecting with the measurement main-machine communication
Electrically operated valve B, screen assemblies are installed on the inside of electrically operated valve B.
4. according to claim 3 automatically with brill gas bearing capacity rapid determination device, which is characterized in that the screening group
Part includes the internal layer filter screen, intermediate filtered net and outer filter net being successively set side by side, and the outer filter net, which is set to, to be leaned on
The side of the nearly electrically operated valve B, the internal layer filter screen are disposed in proximity to the side of the coal sample cup；And the internal layer filtering
The aperture of net is 3mm, and the aperture of intermediate filtered net is 2mm, and the aperture of outer filter net is 1mm.
5. according to claim 1 automatically with brill gas bearing capacity rapid determination device, which is characterized in that the motor-driven valve
Image acquisition device for samples of coal pulled size distribution is installed below door A.
6. according to claim 5 automatically with brill gas bearing capacity rapid determination device, which is characterized in that described image is adopted
Collection includes the multiple cameras being arranged in below the measuring cylinder, and multiple camera shootings are circularly and evenly distributed described electronic
The lower section of valve A.
7. according to claim 1 automatically with brill gas bearing capacity rapid determination device, which is characterized in that the coal sample cup
Top be equipped with the coal sample cleaning plant for removing extra coal sample above coal sample cup, the coal sample cleaning plant is set including level
It sets the coal sample brush at the top of the coal sample cup, the retarder connecting with the coal sample brush and is connect with the retarder miniature
Stepper motor.
8. according to claim 1 automatically with brill gas bearing capacity rapid determination device, which is characterized in that the air pressure is steady
Pressure device includes the pressure stabilizing pipeline of the drilling tail connection, and the pressure stabilizing pipeline is equipped with pressure gauge A, the pressure gauge A and drilling tail
The side of connection is equipped with aperture adjustable ball valve, and described separate one end connecting with drilling tail pressure gauge A is equipped with air pressure regulator.
9. according to claim 8 automatically with brill gas bearing capacity rapid determination device, which is characterized in that the pressure gauge
A and pressure gauge B is intelligent voltage table, passes through bluetooth and connect with measurement host.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810793186.9A CN108896435A (en) | 2018-07-18 | 2018-07-18 | Full-automatic while-drilling gas content rapid determination device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810793186.9A CN108896435A (en) | 2018-07-18 | 2018-07-18 | Full-automatic while-drilling gas content rapid determination device |
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| Publication Number | Publication Date |
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| CN108896435A true CN108896435A (en) | 2018-11-27 |
Family
ID=64350807
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|---|---|---|---|
| CN201810793186.9A Pending CN108896435A (en) | 2018-07-18 | 2018-07-18 | Full-automatic while-drilling gas content rapid determination device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112630083A (en) * | 2020-11-30 | 2021-04-09 | 中国地质大学（北京） | Measuring device for escaping gas in shale core coring and crushing processes and working method thereof |
| CN113216934A (en) * | 2021-05-17 | 2021-08-06 | 吕梁学院 | Coal seam gas content measuring device of directional drilling machine |
| CN113266347A (en) * | 2021-07-05 | 2021-08-17 | 中煤科工集团重庆研究院有限公司 | Near-bit coal seam gas parameter while-drilling comprehensive measurement device and method |
| CN113866380A (en) * | 2021-09-29 | 2021-12-31 | 中海石油(中国)有限公司 | High-coal-rank coal seam free gas content determination device and determination method |
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| CN112630083B (en) * | 2020-11-30 | 2021-09-17 | 中国地质大学（北京） | Measuring device for escaping gas in shale core coring and crushing processes and working method thereof |
| CN113216934A (en) * | 2021-05-17 | 2021-08-06 | 吕梁学院 | Coal seam gas content measuring device of directional drilling machine |
| CN113266347A (en) * | 2021-07-05 | 2021-08-17 | 中煤科工集团重庆研究院有限公司 | Near-bit coal seam gas parameter while-drilling comprehensive measurement device and method |
| CN113866380A (en) * | 2021-09-29 | 2021-12-31 | 中海石油(中国)有限公司 | High-coal-rank coal seam free gas content determination device and determination method |
| CN113866380B (en) * | 2021-09-29 | 2023-12-08 | 中海石油(中国)有限公司 | High-rank coal seam free gas content measuring device and measuring method |
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Application publication date: 20181127 |