CN106567685A - Ground coal bed sealed core-drilling gas content testing device and method - Google Patents
Ground coal bed sealed core-drilling gas content testing device and method Download PDFInfo
- Publication number
- CN106567685A CN106567685A CN201610965574.1A CN201610965574A CN106567685A CN 106567685 A CN106567685 A CN 106567685A CN 201610965574 A CN201610965574 A CN 201610965574A CN 106567685 A CN106567685 A CN 106567685A
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- 239000003245 coal Substances 0.000 title claims abstract description 64
- 238000005553 drilling Methods 0.000 title claims abstract description 45
- 238000012360 testing method Methods 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000007789 sealing Methods 0.000 claims abstract description 69
- 230000007246 mechanism Effects 0.000 claims abstract description 39
- 239000011435 rock Substances 0.000 claims abstract description 21
- 230000007704 transition Effects 0.000 claims abstract description 8
- 230000008569 process Effects 0.000 claims abstract description 6
- 239000000725 suspension Substances 0.000 claims abstract description 5
- 238000003795 desorption Methods 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 239000010959 steel Substances 0.000 claims description 7
- 239000000284 extract Substances 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 230000002085 persistent effect Effects 0.000 claims description 3
- 238000012797 qualification Methods 0.000 claims description 3
- 238000010998 test method Methods 0.000 claims description 3
- 241001074085 Scophthalmus aquosus Species 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims 3
- 238000005266 casting Methods 0.000 abstract 3
- 238000005520 cutting process Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000003556 assay Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
- E21B25/02—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors the core receiver being insertable into, or removable from, the borehole without withdrawing the drilling pipe
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
- E21B25/02—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors the core receiver being insertable into, or removable from, the borehole without withdrawing the drilling pipe
- E21B25/04—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors the core receiver being insertable into, or removable from, the borehole without withdrawing the drilling pipe the core receiver having a core forming cutting edge or element, e.g. punch type core barrels
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Sampling And Sample Adjustment (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a ground coal bed sealed core-drilling gas content testing device which is formed by connecting a core-drilling drill bit, a drill bit transition head, a core-drilling outer drum and a fishing head from bottom to top. A rock core sealing mechanism is arranged in the core-drilling outer drum. An upper alignment bearing pack is arranged on the upper side of the rock core sealing mechanism. A lower alignment bearing pack is arranged on the lower side of the rock core sealing mechanism. The rock core sealing mechanism is sleeved with a hydraulic push barrel. The upper portion of the hydraulic push barrel is provided with a ball casting mechanism which is composed of a ball casting pipeline and a ball casting ball seat. The fishing head is connected with the core-drilling outer drum and the rock core sealing mechanism through a suspension assembly. One side of the hydraulic push barrel is connected with a hydraulic push mechanism in a matched mode, and the hydraulic push mechanism is used for providing power. The invention further discloses a ground coal bed sealed core-drilling gas content testing method. The ground coal bed sealed core-drilling gas content testing device and method can reduce or avoid the gas content loss caused in the drill lifting process and the coal sample tinning process, reduce or avoid pollution of coal samples by core-drilling media, and improve the accuracy of gas content testing results.
Description
Technical field
The invention belongs to safety of coal mines and technical field of coalbed methane exploration and development, specifically related to a kind of ground coal seam is closed
Core Gas content test device and its method.
Background technology
Coal bed gas content is the important parameter for characterizing coal seam reservoirs feature, is coal bed gas resource estimation, capability forecasting and well pattern
The important evidence of layout design；Also it is an important indicator for characterizing mine gas degree of danger.
The practice of coal production and cbm development during coal bed gas resource exploration and coal exploration it has been shown that adopt
Gas content test is carried out with desorption method, its test result is significantly lower than actual Gas content in coal seam.Its test Gas content is by losing
Gas, stripping gas and the part of residual gas three.Think that the reason for causing coal bed gas content test low is mainly, using traditional
Basket is mostly semi-enclosed in coring method, above carries to ground from shaft bottom in the coal heart for obtaining, and on ground from basket
Core and load the process of coal bed gas solution cucurbitula, coal seam exposure so that substantial amounts of gas escape causes a large amount of loss of gas, loses
Gas content estimation is inaccurate；And ground coal bed gas content measuring precision is improved, this requires to shorten the sudden and violent of the time of coring and the coal heart
The dew time, the gas loss during coring is reduced to greatest extent, and sealing core drilling equipment can be during coal seam be cored
The integrity of lithology is kept, and the coal heart can be carried out completely closed, it is therefore prevented that the loss of coal seam gas；And mutually tie with wire line coring
Close, can quickly, simplicity complete work of coring.And the ground sealing core drilling equipment reported at present is applied to surveying for oil field more
Visit exploitation and gas hydrates are cored field, only have inventor Sun Si in coal exploration and coal bed gas resource Exploration Domain
It is clear the open sealed coring techniques for proposing in 2014 and corresponding sealing core drilling assay device and 2010 fourths be bright and inventor
The underground coal mine sealing core drilling device that the joint such as Sun Siqing is proposed.
And existing ground sealing core drilling device its cut power aroused in interest and provide for power spring, spring energy storage mode compares
Complexity, needs special boosting mechanism；Spring reverse cyclic loadings are affected by fatigue life, and spring life is reduced after repeated loading；
And can not realize the problems such as coring test integrated with air content.
It is the complexity of the equipment operation technique, suitable although existing underground airtight coring apparatus can realize sealing core drilling
Restricted by certain with condition, and may not apply to ground and core.
The content of the invention
In view of this, present invention is primarily targeted at provide a kind of ground coal seam sealing core drilling Gas content test device and
Its method
To reach above-mentioned purpose, the technical scheme is that what is be achieved in that：
The embodiment of the present invention provides a kind of ground coal seam sealing core drilling Gas content test device, and the device is by core bit, drill bit
Transition head, outer tube of coring, fishing head connect from bottom to top composition, and rock core sealing mechanism is provided with the outer tube of coring, described
The both sides up and down of rock core sealing mechanism are respectively provided with alignment bearing group, lower alignment bearing group, and the rock core sealing mechanism is arranged
There is hydraulic drive cylinder, the top of the hydraulic drive cylinder arranges the pitching mechanism of pitching pipeline and pitching ball seat composition, described to beat
Head is dragged for by suspension assembly and connection between outer tube and rock core sealing mechanism of coring, the hydraulic drive cylinder side and offer power
Hydraulic force mechanism be connected.
In such scheme, the rock core sealing mechanism includes coring inner drum, cuts the heart and Sealing ball-valve, high pressure desorption valve
Group, the outer cylinder front end of coring is connected by screw thread and drill bit transition head with core bit, and end is taken by fishing head with rope
Heart drilling rod connects, the outer tube inner sleeve coring inner drum of coring, and the high pressure desorption valve group is located at coring inner drum top, with downside
Cut the linkage of the heart and Sealing ball-valve；The heart and the Sealing ball-valve of cutting is positioned between coring inner drum lower end and core bit.
In such scheme, the hydraulic drive cylinder is made up of ram pot and O-ring seal, pin, positioned at coring inner drum and
Core between outer tube.
In such scheme, the hydraulic drive cylinder top is provided with O-ring seal.
The embodiment of the present invention also provides a kind of method of testing of ground coal seam sealing core drilling Gas content, and the method is by following
Step is realized：
One：Determine hole position, target layer depth, and pressure testing inspection is carried out to ground coal seam sealing core drilling Gas content test device, really
Recognize its qualification；
Two：Slush pump and rig are opened, outer tube of coring drives core bit to creep in coal seam, and coring inner drum collects coal sample, reaches
Stop to bore to after length requirement of coring；
Three：Steel ball is put into from drilling rod on ground, during steel ball to be delivered to the ball seat of ball-throwing apparatus, the water-guiding hole of ball seat bottom is blocked
Plug, slush pump persistent pressure to the pin at the top of hydraulic drive cylinder cuts off, promote hydraulic drive cylinder obtain enough momentum to
Front motion, drives catch bar to cut the closing of bulbus cordis valve, cuts off the coal heart, and links with high-pressure sealed ball valve, makes device Integral sealing,
Complete whole sealing core drilling process；
Four：After the completion of the coal heart is drilled through, by subsurface wire line coring fisher, by the fishing head with sealing core drilling device upper end
Connection, extracts the coal heart, and device is directly connected to be tested with Gas content test device.
Compared with prior art, beneficial effects of the present invention：
1. the present invention can directly with Gas content test device matching test, realize core-desorbing integration.
2. the present invention is provided with hydraulic force mechanism and promotes cylinder by the annular space between coring inner drum and outer tube, interior
Cylinder top high pressure desorption valve cuts heart Sealing ball-valve in hydraulic force mechanism and promotes and form connection under the dynamic action of cylinder with downside
It is dynamic to close, ensure that core barrel is fully sealed in time after coring, shorten coal sample open-assembly time to greatest extent, it is reduced or avoided
Carry and boring and Gas content loss that coal sample tinning link is caused, reduce or avoid coal sample to be cored medium pollution, improve Gas content survey
The accuracy of test result.
3rd, present invention top is provided with fishing head, can be directly connected to existing cable core tube assembly, carries out ground brill
Well is cored work, it is ensured that drilling well work efficiency, is improved operating speed, is reduced cost, reduces labor intensity and Gas content test
As a result accuracy
4. the power source of the present invention is mainly after core-drilling terminates, during steel ball to be delivered to the ball seat of ball-throwing apparatus, so as to block
Water-guiding hole, the pin that the top of hydraulic drive cylinder is forced into by slush pump is cut off, and promotes hydraulic drive cylinder to obtain enough moving
Amount travels forward, and drives catch bar to cut the closing of bulbus cordis valve, cuts off the coal heart, and links to provide with high-pressure sealed ball valve, simply
Easily realize；
5., present invention achieves the target of bitubular single action, i.e. coring inner drum and hydraulic drive cylinder do not rotate, outer tube drives drill bit rotation
Turn, this avoid coring inner drum and rotate and the destruction of the caused coal heart, maintain the integrity of sample.
Description of the drawings
Fig. 1 is the superstructure schematic diagram of apparatus of the present invention；
Fig. 2 is substructure schematic diagram of apparatus of the present invention.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, and
It is not used in the restriction present invention.
The embodiment of the present invention provides a kind of ground coal seam sealing core drilling Gas content test device, as shown in Figure 1, 2, the device
Connected from bottom to top by core bit 1, drill bit transition head 2, outer tube 6 of coring, fishing head 16 and constituted, set in the outer tube 6 of coring
Rock core sealing mechanism is equipped with, the both sides up and down of the rock core sealing mechanism are respectively provided with alignment bearing group 8, lower alignment bearing group
18, the rock core sealing mechanism is arranged with hydraulic drive cylinder 9, and the top of the hydraulic drive cylinder 9 arranges pitching pipeline 11 and throws
The pitching mechanism of the composition of ball ball seat 10, the fishing head 16 by suspension assembly 15 with core outer tube 6 and rock core sealing mechanism it
Between connect, the side of hydraulic drive cylinder 9 with offer power hydraulic force mechanism 13 be connected.
The rock core sealing mechanism includes coring inner drum 5, cuts the heart and Sealing ball-valve 3, high pressure desorption valve group 7, described to take
The front end of heart outer tube 6 is connected by screw thread and drill bit transition head 2 with core bit 1, and end is bored by fishing head 16 with wire line coring
Bar connects, the inner sleeve coring inner drum 5 of outer tube 6 of coring, and the high pressure desorption valve group 7 is located at the top of coring inner drum 5, with downside
Cut the linkage of the heart and Sealing ball-valve 3；The heart and the Sealing ball-valve 3 of cutting is positioned between the lower end of coring inner drum 5 and core bit 1.
The hydraulic drive cylinder 9 is made up of ram pot and O-ring seal 12, pin 4, positioned at coring inner drum 5 and is cored outer
Between cylinder 6.
The top of hydraulic drive cylinder 9 is provided with O-ring seal 12.
As shown in Figure 1, 2, the front end of outer tube 6 of coring is connected by screw thread and drill bit transition head 2 with core bit 1, end
End is connected by fishing head 16 with rope coring drill pipe, inner sleeve coring inner drum 5, and the outer tube 6 of coring is played protects built-in taking
Intracardiac cylinder 5, hydraulic drive cylinder 9 and hydraulic force mechanism 13, jointed rod and transmitting torque, drive the core-drilling of core bit 1
Effect, its need to have anti-high intensity ability material prepare；The coring inner drum 5 with cut the heart and Sealing ball-valve 3, high pressure desorption valve
Door group 7 collectively constitutes rock core sealing mechanism, and its Main Function is after core-drilling terminates, the coal heart to be enclosed in its cylinder, and is had
Desorption of mash gas tank function, can connect Gas content test equipment without the need for tinning carries out Gas content test, and using hard sealing
Form is reaching the purpose of long-time high pressure sealing.
The hydraulic drive cylinder 9 is made up of ram pot and O-ring seal 12, pin 4, positioned at coring inner drum 5 and is cored outer
Between cylinder 6, it is mainly after pitching builds the pressure to pin and cuts off, there is provided power promotes to cut the heart and the cut-out coal heart of Sealing ball-valve 3, and closes
Close ball valve 3；The end of the hydraulic force mechanism 13 is fixed in the draw-in groove of pipeline 11 of ball-throwing apparatus by pin 17, and it is mainly in mud
Under the pressure effect of stock pump transmission, it is that the offer of hydraulic drive cylinder 9 is dynamic that hydraulic force mechanism 13 cuts off pin by thrust bearing 8
Power；The suspension assembly 14 is made up of angular contact bearing group, with bitubular single action feature, i.e. coring inner drum 5 and hydraulic drive cylinder 9
Do not rotate, outer tube 6 of coring drives drill bit 1 to rotate, it is to avoid coring inner drum 5 rotates and the caused coal heart is destroyed, it is ensured that sample
Integrity；The high pressure desorption valve group 7 is located at the top of coring inner drum 5, cuts the linkage of the heart and Sealing ball-valve 3 to protect with downside
Core barrel is fully sealed in time after card is cored, and directly can be connected with Gas content test equipment and carried out Gas content test；It is described to cut
The heart and Sealing ball-valve 3 are located between the lower end of coring inner drum 5 and core bit 1, are mainly used in cutting the coal heart, under sealing coring inner drum
End.
The ball-throwing apparatus of the pitching pipeline 11 and the composition of pitching ball seat 10 are located at the top of hydraulic drive cylinder 9, and it is mainly
After core-drilling terminates, be pressurized by drilling rod pitching and slush pump, be hydraulic force mechanism 13 promote push rod close cut the heart and
Sealing ball-valve 3 provides power.
The O-ring seal 12 is located at the top of hydraulic drive cylinder 9, and its master plays a part of sealed hydraulic and promotes cylinder 9.
Described hydraulic force mechanism 13 is vertically disposed with the righting of alignment bearing group 8 and lower alignment bearing group 18 composition
Bearing group, ensure that hydraulic force mechanism provide power carry out cutting the heart it is closed during the grade component stability of coring inner drum 5 and peace
Quan Xing.
The embodiment of the present invention also provides a kind of method of testing of ground coal seam sealing core drilling Gas content, and the method is by following
Step is realized：
One：Determine hole position, target layer depth, and pressure testing inspection is carried out to ground sealing core drilling device, confirm its qualification；
Two：Slush pump and rig are opened, drive core bit 1 to drill through coal sample using outer tube 6 of coring, coring inner drum 5 collects coal sample,
Reach and stop to bore after length requirement of coring；
Three：Steel ball is put into from drilling rod on ground, during steel ball to be delivered to the pitching ball seat 10 of ball-throwing apparatus, the bottom of pitching ball seat 10
Water-guiding hole be blocked, slush pump persistent pressure to the pin at the top of hydraulic drive cylinder 9 cuts off 17, promotes hydraulic drive cylinder 9
Obtain enough momentum to travel forward, drive catch bar to cut heart Sealing ball-valve 3 and close, cut off the coal heart, and with high-pressure sealed ball
Valve 7 links, and makes device Integral sealing, completes whole sealing core drilling process；
Four：After the completion of the coal heart is drilled through, connected with the fishing head 16 of sealing core drilling device upper end by subsurface wire line coring fisher
Connect, extract the coal heart, and device is directly connected to be tested with Gas content test device.
The above, only presently preferred embodiments of the present invention is not intended to limit protection scope of the present invention.
Claims (5)
1. a kind of ground coal seam sealing core drilling Gas content test device, it is characterised in that the device is by core bit, drill bit transition
Head, outer tube of coring, fishing head connect from bottom to top composition, and rock core sealing mechanism, the rock core are provided with the outer tube of coring
The both sides up and down of sealing mechanism are respectively provided with alignment bearing group, lower alignment bearing group, and the rock core sealing mechanism is arranged with liquid
Pressure promotes cylinder, the top of the hydraulic drive cylinder to arrange the pitching mechanism of pitching pipeline and pitching ball seat composition, the fishing head
By suspension assembly and connection between outer tube and rock core sealing mechanism of coring, the hydraulic drive cylinder side and the liquid for providing power
Pressure pushing mechanism is connected.
2. sealing core drilling Gas content test device in ground coal seam according to claim 1, it is characterised in that the rock core is close
Sealing mechanism includes coring inner drum, cuts the heart and Sealing ball-valve, high pressure desorption valve group, and the outer cylinder front end of coring is by screw thread and brill
Head transition head is connected with core bit, and end is connected by fishing head with rope coring drill pipe, and the outer tube inner sleeve of coring is cored
Inner core, the high pressure desorption valve group is located at coring inner drum top, with the linkage that the heart and Sealing ball-valve are cut in downside；It is described cut the heart and
Sealing ball-valve is located between coring inner drum lower end and core bit.
3. sealing core drilling Gas content test device in ground coal seam according to claim 1 and 2, it is characterised in that：The liquid
Pressure promotes cylinder to be made up of ram pot and O-ring seal, pin, positioned at coring inner drum and cores between outer tube.
4. sealing core drilling Gas content test device in ground coal seam according to claim 3, it is characterised in that：The hydraulic thrust
Dynamic cylinder top is provided with O-ring seal.
5. a kind of method of testing of ground coal seam sealing core drilling Gas content, it is characterised in that the method is realized by following steps：
One：Determine hole position, target layer depth, and pressure testing inspection is carried out to ground coal seam sealing core drilling Gas content test device, really
Recognize its qualification；
Two：Slush pump and rig are opened, outer tube of coring drives core bit to creep in coal seam, and coring inner drum collects coal sample, reaches
Stop to bore to after length requirement of coring；
Three：Steel ball is put into from drilling rod on ground, during steel ball to be delivered to the ball seat of ball-throwing apparatus, the water-guiding hole of ball seat bottom is blocked
Plug, slush pump persistent pressure to the pin at the top of hydraulic drive cylinder cuts off, promote hydraulic drive cylinder obtain enough momentum to
Front motion, drives catch bar to cut the closing of bulbus cordis valve, cuts off the coal heart, and links with high-pressure sealed ball valve, makes device Integral sealing,
Complete whole sealing core drilling process；
Four：After the completion of the coal heart is drilled through, by subsurface wire line coring fisher, by the fishing head with sealing core drilling device upper end
Connection, extracts the coal heart, and device is directly connected to be tested with Gas content test device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610965574.1A CN106567685A (en) | 2016-10-28 | 2016-10-28 | Ground coal bed sealed core-drilling gas content testing device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610965574.1A CN106567685A (en) | 2016-10-28 | 2016-10-28 | Ground coal bed sealed core-drilling gas content testing device and method |
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| Publication Number | Publication Date |
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| CN106567685A true CN106567685A (en) | 2017-04-19 |
Family
ID=58535836
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610965574.1A Pending CN106567685A (en) | 2016-10-28 | 2016-10-28 | Ground coal bed sealed core-drilling gas content testing device and method |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108756874A (en) * | 2018-06-11 | 2018-11-06 | 中国海洋石油集团有限公司 | A kind of logger and coring and sampling method |
| CN110454105A (en) * | 2019-08-27 | 2019-11-15 | 中煤科工集团重庆研究院有限公司 | Coal mine underground coal bed gas bearing capacity with boring in-situ test system and method |
| CN110700781A (en) * | 2018-07-09 | 2020-01-17 | 中国石油化工股份有限公司 | Shale fluid-retaining closed coring device and method |
| CN111335837A (en) * | 2018-12-19 | 2020-06-26 | 中国石油天然气股份有限公司 | Pressure-maintaining coring inner barrel for coal rock |
| CN111411912A (en) * | 2019-04-19 | 2020-07-14 | 中国石油天然气股份有限公司 | Fireflooding formation well drilling and coring method and well drilling and coring device thereof |
| CN113653455A (en) * | 2021-10-19 | 2021-11-16 | 中煤科工集团西安研究院有限公司 | Coal seam and soft rock stratum drilling while-drilling airtight coring device and method |
| CN114233223A (en) * | 2021-11-24 | 2022-03-25 | 中煤科工集团西安研究院有限公司 | Pressure-maintaining and quick coring device for coal rock strata of ground well |
| CN114441216A (en) * | 2021-12-22 | 2022-05-06 | 中煤科工集团西安研究院有限公司 | Dry-type closed sampling method for underground deep hole of coal mine |
| CN114991767A (en) * | 2022-07-01 | 2022-09-02 | 中国地质科学院勘探技术研究所 | Deep typical weak source gas drilling continuous in-situ sampling device and sampling method |
| CN115615869A (en) * | 2022-12-16 | 2023-01-17 | 中国石油大学(华东) | Loss gas amount testing device and method for simulating rope coring process |
| US11905829B2 (en) | 2020-01-03 | 2024-02-20 | China Oilfield Services Limited | Integrated logging instrument for coring and sampling |
| CN114233223B (en) * | 2021-11-24 | 2024-05-31 | 中煤科工集团西安研究院有限公司 | Ground well coal stratum pressurize quick coring device |
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