CN114991767A - Deep typical weak source gas drilling continuous in-situ sampling device and sampling method - Google Patents
Deep typical weak source gas drilling continuous in-situ sampling device and sampling method Download PDFInfo
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- CN114991767A CN114991767A CN202210775403.8A CN202210775403A CN114991767A CN 114991767 A CN114991767 A CN 114991767A CN 202210775403 A CN202210775403 A CN 202210775403A CN 114991767 A CN114991767 A CN 114991767A
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- 238000005070 sampling Methods 0.000 title claims abstract description 60
- 238000005553 drilling Methods 0.000 title claims abstract description 39
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000007789 sealing Methods 0.000 claims abstract description 58
- 239000000725 suspension Substances 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000012530 fluid Substances 0.000 claims abstract description 11
- 239000011435 rock Substances 0.000 claims description 7
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 3
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 3
- 241001330002 Bambuseae Species 0.000 claims description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 3
- 239000011425 bamboo Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 45
- 239000001307 helium Substances 0.000 description 8
- 229910052734 helium Inorganic materials 0.000 description 8
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 241000894007 species Species 0.000 description 1
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- 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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
- E21B49/087—Well testing, e.g. testing for reservoir productivity or formation parameters
- E21B49/088—Well testing, e.g. testing for reservoir productivity or formation parameters combined with sampling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/70—Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells
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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)
- Sampling And Sample Adjustment (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a deep typical weak source gas drilling continuous in-situ sampling device and a sampling method, wherein the deep typical weak source gas drilling continuous in-situ sampling device comprises an outer barrel, the upper end of the outer barrel is connected with a drill rod joint, the lower end of the outer barrel is connected with a coring bit, and a suspension assembly, a hydraulic pushing mechanism, a ball seat water distribution joint, an upper sealing ball valve, a coring inner barrel and a lower sealing ball valve which are sequentially connected from top to bottom are arranged in the outer barrel; the hydraulic pushing mechanism comprises a central pipe and a sliding sleeve, a side opening is formed in the side wall of the central pipe, a sliding sleeve is sealed and sleeved on the central pipe and located below the side opening, the sliding sleeve is connected with the inner wall of an outer barrel in a sliding and sealing mode, the lower end of the sliding sleeve is connected with the upper end of a hydraulic pushing barrel, an upper shifting rod is arranged on the upper sealing ball valve, a lower shifting rod is arranged on the lower sealing ball valve, and after a ball is thrown into the ball seat water distribution joint, hydraulic fluid pushes the sliding sleeve to move downwards and shifts the upper shifting rod and the lower shifting rod, so that the upper sealing ball valve and the lower sealing ball valve are closed. The invention can continuously sample the deep weak source gas in situ and provides technical support for the resource exploration and research of the weak source gas.
Description
Technical Field
The invention relates to the technical field of exploration equipment, in particular to a deep typical weak source gas drilling continuous in-situ sampling device and a sampling method.
Background
Compared with conventional oil gas, the shell source helium gas is a typical weak source gas, does not have a concentrated gas generation peak, is usually produced by associated gas of methane or carbon dioxide gas reservoirs, is mainly used for extracting helium from natural gas at present in China, and has few exploration work carried out as mineral species. The drilling and completion technology aiming at helium resource exploration and development is lacked in China, and the technologies at home and abroad, such as a helium underground recognition technology and the like, are still blank, so that a plurality of processes and appliances needing to be attacked are faced.
Disclosure of Invention
The invention aims to provide a deep typical weak source gas drilling continuous in-situ sampling device and a sampling method, which are used for solving the problems in the prior art, can continuously sample deep weak source gas in situ and provide technical support for resource exploration and research of weak source gas such as helium.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a deep typical weak source gas drilling continuous in-situ sampling device which comprises an outer barrel, wherein the upper end of the outer barrel is connected with a drill rod joint, the lower end of the outer barrel is connected with a coring bit, and a suspension assembly, a hydraulic pushing mechanism, a water dividing ball seat joint, an upper sealing ball valve, a coring inner barrel and a lower sealing ball valve which are sequentially connected from top to bottom are arranged in the outer barrel;
the hydraulic pushing mechanism comprises a central pipe and a sliding sleeve, the central pipe is rotatably connected into the outer barrel through the suspension assembly, a central pipe channel in the central pipe is communicated with the inner cavity of the drill pipe joint through a suspension assembly channel in the suspension assembly, the central pipe channel is communicated with the inner cavity of the ball seat water distribution joint, the inner cavity of the ball seat water distribution joint is communicated with the inner cavity of the coring inner barrel through the upper sealing ball valve, and the inner cavity of the coring inner barrel is communicated with the central hole of the coring bit through the lower sealing ball valve;
the side wall of the central tube is provided with a side opening communicated with the channel of the central tube, the sliding sleeve is sleeved on the central tube and is connected with the central tube in a sliding and sealing manner, the sliding sleeve is positioned below the side opening, the sliding sleeve is also connected with the inner wall of the outer tube in a sliding and sealing manner, the lower end of the sliding sleeve is connected with the upper end of a hydraulic pushing tube, and the hydraulic pushing tube is sleeved outside the water dividing joint of the ball seat and the upper sealing ball valve and extends towards the direction of the lower sealing ball valve;
go up the driving lever on the sealed spheroid of sealed ball valve, go up the driving lever pass set up in cross the discharge orifice on the hydraulic pressure promotes a lateral wall, be equipped with down the driving lever down on the sealed spheroid of sealed ball valve down, the driving lever passes through link mechanism and connects down the lower extreme of hydraulic pressure propelling movement section of thick bamboo, work as to after the bowling in the ball seat water swivel, hydraulic fluid warp drilling rod joint hang the assembly passageway with follow behind the center tube passageway the side opening gets into the annular seal chamber of sliding sleeve top, hydraulic fluid promotes the sliding sleeve downstream is stirred go up the driving lever with down the driving lever will go up sealed ball valve with sealed ball valve closes down.
Preferably, the lower end of the hydraulic pushing cylinder is connected with a sliding block, and the sliding block is arranged in an annular space between the coring inner cylinder and the outer cylinder in a sliding mode.
Preferably, the link mechanism comprises a first connecting rod and a second connecting rod, the upper end of the first connecting rod is fixedly connected with the lower end of the sliding block, the lower end of the first connecting rod is rotatably connected with the upper end of the second connecting rod, and the lower end of the second connecting rod is rotatably connected with the lower poking rod.
Preferably, the suspension assembly comprises a fixed part and a rotating part, the fixed part is fixedly connected to the lower end of the drill rod joint, the suspension assembly channel is arranged in the fixed part, the rotating part is sleeved outside the fixed part in a rotating mode, and the upper end of the central pipe is fixedly connected to the lower end of the rotating part.
The invention also provides a continuous in-situ sampling method for deep typical weak source gas drilling, which adopts the continuous in-situ sampling device for deep typical weak source gas drilling to perform sampling and comprises the following steps:
s1: lowering the deep typical weak source gas drilling continuous in-situ sampling tool to a gas-containing core section;
s2: performing rotary drilling, namely sampling a gas-containing rock core sample in the coring inner cylinder, wherein the coring inner cylinder adopts a large-caliber long coring cylinder;
s3: the ball is thrown, the ball seat water distribution joint is plugged, the sliding sleeve is pushed to move downwards through hydraulic fluid, the sliding sleeve stirs the upper shifting rod and the lower shifting rod, and the upper sealing ball valve and the lower sealing ball valve are closed;
s4: and lifting the deep typical weak source gas drilling continuous in-situ sampling tool upwards, and taking out the upper sealing ball valve, the coring inner cylinder and the lower sealing ball valve integrally to obtain the gas-containing core sample.
Preferably, the core barrel has the aperture of 127-140mm and the length of 8.5-9.6 m.
Compared with the prior art, the invention achieves the following technical effects:
according to the deep typical weak source gas drilling continuous in-situ sampling tool and the sampling method, the coring inner cylinder can be closed after sampling is finished through the coring inner cylinder, the upper sealing ball valve and the lower sealing ball valve, gas leakage in the gas-containing core sample is prevented, in-situ sampling of weak source gas drilling is realized, because the content of weak source gas in the core is low, a large-diameter long core sample can be obtained by sampling through the large-diameter long coring cylinder, the gas-containing core sample meeting the requirement can be obtained through one-time sampling, multiple times of sampling are not needed, the sampling efficiency is greatly improved, the sampling cost is reduced, and technical support is provided for resource exploration research of weak source gas such as helium.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural view of a deep exemplary weak source gas drilling continuous in-situ sampling tool provided by the present invention;
in the figure: 100-deep typical weak source gas drilling continuous in-situ sampling device, 1-outer cylinder, 2-drill rod joint, 3-coring bit, 4-suspension assembly, 41-suspension assembly channel, 42-fixed part, 43-rotating part, 5-hydraulic pushing mechanism, 51-central tube, 511-side opening, 52-sliding sleeve, 53-central tube channel, 54-hydraulic pushing cylinder, 541-an overflowing hole, 55-a sliding block, 6-a ball seat water distribution joint, 7-an upper sealing ball valve, 8-a coring inner cylinder, 9-a lower sealing ball valve, 10-an upper deflector rod, 11-a lower deflector rod, 12-a link mechanism, 121-a first link rod, 122-a second link rod, 13-an annular sealing cavity and 14-an annular space.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a deep typical weak source gas drilling continuous in-situ sampling device and a sampling method, which are used for solving the problems in the prior art, can continuously sample deep weak source gas in situ and provide technical support for resource exploration research of weak source gas such as helium.
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description thereof.
As shown in fig. 1, the present embodiment provides a deep typical weak source gas drilling continuous in-situ sampling device 100, which includes an outer cylinder 1, wherein the upper end of the outer cylinder 1 is connected to a drill rod joint 2, the lower end is connected to a coring bit 3, and a suspension assembly 4, a hydraulic pushing mechanism 5, a ball seat water diversion joint 6, an upper sealing ball valve 7, a coring inner cylinder 8 and a lower sealing ball valve 9 are arranged in the outer cylinder 1, which are sequentially connected from top to bottom;
the hydraulic pushing mechanism 5 comprises a central pipe 51 and a sliding sleeve 52, the central pipe 51 is rotatably connected into the outer barrel 1 through a suspension assembly 4, a central pipe passage 53 in the central pipe 51 is communicated with an inner cavity of the drill pipe joint 2 through a suspension assembly passage 41 in the suspension assembly 4, the central pipe passage 53 is communicated with an inner cavity of the ball seat water distribution joint 6, the inner cavity of the ball seat water distribution joint 6 is communicated with an inner cavity of the coring inner barrel 8 through an upper sealing ball valve 7, and the inner cavity of the coring inner barrel 8 is communicated with a central hole of the coring bit 3 through a lower sealing ball valve 9;
the side wall of the central tube 51 is provided with a side opening 511 communicated with a central tube channel 53, the sliding sleeve 52 is sleeved on the central tube 51 and is connected with the central tube 51 in a sliding and sealing manner, the sliding sleeve 52 is positioned below the side opening 511, the sliding sleeve 52 is also connected with the inner wall of the outer tube 1 in a sliding and sealing manner, the lower end of the sliding sleeve 52 is connected with the upper end of a hydraulic pushing tube 54, and the hydraulic pushing tube 54 is sleeved outside the ball seat water distribution joint 6 and the upper sealing ball valve 7 and extends towards the lower sealing ball valve 9;
an upper deflector rod 10 is arranged on a sealing ball body of the upper sealing ball valve 7, the upper deflector rod 10 penetrates through an overflowing hole 541 formed in the side wall of the hydraulic pushing cylinder 54, a lower deflector rod 11 is arranged on a sealing ball body of the lower sealing ball valve 9, the lower deflector rod 11 is connected with the lower end of the hydraulic pushing cylinder 54 through a link mechanism 12, when a ball is thrown into the ball seat water distribution connector 6, hydraulic fluid enters the annular sealing cavity 13 above the sliding sleeve 52 from the side hole 511 after passing through the drill rod connector 2, the suspension assembly channel 41 and the central pipe channel 53, the hydraulic fluid pushes the sliding sleeve 52 to move downwards and stirs the upper deflector rod 10 and the lower deflector rod 11, and the upper sealing ball valve 7 and the lower sealing ball valve 9 are closed.
When sampling, selecting a large-caliber long coring inner cylinder 8 for sampling, after sampling is completed, throwing a ball to a ball seat water distribution joint 6, under the action of hydraulic fluid, pushing a sliding sleeve 52 to move downwards through a hydraulic pushing mechanism 5, and driving a hydraulic pushing cylinder 54 to move downwards through the downward movement of the sliding sleeve 52, so that an upper deflector rod 10 is stirred through the upper end of an overflowing hole 541 to close an upper sealing ball valve 7, and after the hydraulic pushing cylinder 54 moves downwards, a lower deflector rod 11 is also stirred through a connecting rod mechanism 12 to close a lower sealing ball valve 9, so that the aim of sealing after sampling of the coring inner cylinder 8 is fulfilled, gas leakage in a gas-containing rock core sample can be prevented, in-situ sampling of weak source gas drilling is realized, and because the content of weak source gas in a rock core is less, sampling is performed by using the large-caliber long coring inner cylinder 8, a large-diameter long rock core sample can be sampled, and a gas-containing rock core sample meeting the requirement can be obtained by one-time sampling, multiple sampling is not needed, the sampling efficiency is greatly improved, the sampling cost is reduced, and technical support is provided for resource exploration research of weak source gases such as helium.
In this embodiment, the lower end of the hydraulic pushing cylinder 54 is connected with a sliding block 55, and the sliding block 55 is slidably disposed in the annular space 14 between the inner core cylinder 8 and the outer cylinder 1. The movement of the hydraulic cylinder 54 is guided by the slide block 55, and the movement of the hydraulic cylinder 54 is stabilized.
In this embodiment, the link mechanism 12 includes a first link 121 and a second link 122, the upper end of the first link 121 is fixedly connected to the lower end of the sliding block 55, the lower end of the first link 121 is rotatably connected to the upper end of the second link 122, and the lower end of the second link 122 is rotatably connected to the lower dial 11.
In this embodiment, the suspension assembly 4 includes a fixed portion 42 and a rotatable portion 43, the fixed portion 42 is fixedly connected to the lower end of the tool joint 2, the suspension assembly passage 41 is disposed in the fixed portion 42, the rotatable portion 43 is rotatably sleeved outside the fixed portion 42, and the upper end of the central tube 51 is fixedly connected to the lower end of the rotatable portion 43. The rotating part 43 is rotatably connected outside the fixing part 42 through a bearing, so that when the outer cylinder 1 is rotated and drilled, the inner core cylinder 8 can not be influenced by the rotation of the outer cylinder 1, and a complete core sample can be obtained through sampling.
A continuous in-situ sampling method for deep typical weak source gas drilling, which adopts the continuous in-situ sampling tool 100 for deep typical weak source gas drilling to perform sampling and comprises the following steps:
s1: lowering the deep typical weak source gas drilling continuous in-situ sampling tool 100 to the gas-containing core section;
s2: performing rotary drilling, sampling a gas-containing rock core sample in the coring inner cylinder 8, wherein the coring inner cylinder 8 adopts a large-caliber long coring cylinder;
s3: throwing a ball, namely plugging the ball seat water distribution joint 6, pushing the sliding sleeve 52 to move downwards through hydraulic fluid, and turning the upper deflector rod 10 and the lower deflector rod 11 by the sliding sleeve 52 to close the upper sealing ball valve 7 and the lower sealing ball valve 9;
s4: and lifting the deep typical weak source gas drilling continuous in-situ sampling tool 100 upwards, and integrally taking out the upper sealing ball valve 7, the coring inner cylinder 8 and the lower sealing ball valve 9 to obtain the gas-containing core sample.
In this embodiment, the inner core barrel 8 is a core barrel with a bore diameter of 127 and 140mm and a length of 8.5-9.6m, preferably a core barrel with a bore diameter of 140mm and a length of 9.6 m.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (6)
1. A deep, typical, weak source gas drilling continuous in situ sampling tool, characterized by: the core drilling machine comprises an outer barrel, wherein the upper end of the outer barrel is connected with a drill rod joint, the lower end of the outer barrel is connected with a core drilling bit, and a suspension assembly, a hydraulic pushing mechanism, a ball seat water distribution joint, an upper sealing ball valve, a core inner barrel and a lower sealing ball valve which are sequentially connected from top to bottom are arranged in the outer barrel;
the hydraulic pushing mechanism comprises a central pipe and a sliding sleeve, the central pipe is rotatably connected into the outer barrel through the suspension assembly, a central pipe channel in the central pipe is communicated with the inner cavity of the drill pipe joint through a suspension assembly channel in the suspension assembly, the central pipe channel is communicated with the inner cavity of the ball seat water distribution joint, the inner cavity of the ball seat water distribution joint is communicated with the inner cavity of the coring inner barrel through the upper sealing ball valve, and the inner cavity of the coring inner barrel is communicated with the central hole of the coring bit through the lower sealing ball valve;
the side wall of the central tube is provided with a side opening communicated with the channel of the central tube, the sliding sleeve is sleeved on the central tube and is in sliding and sealing connection with the central tube, the sliding sleeve is positioned below the side opening, the sliding sleeve is also in sliding and sealing connection with the inner wall of the outer tube, the lower end of the sliding sleeve is connected with the upper end of a hydraulic pushing tube, and the hydraulic pushing tube is sleeved outside the ball seat water distribution joint and the upper sealing ball valve and extends towards the direction of the lower sealing ball valve;
go up the driving lever on the sealed spheroid of sealed ball valve, go up the driving lever pass set up in cross the discharge orifice on the hydraulic pressure promotes a lateral wall, be equipped with down the driving lever down on the sealed spheroid of sealed ball valve down, the driving lever passes through link mechanism and connects down the lower extreme of hydraulic pressure propelling movement section of thick bamboo, work as to after the bowling in the ball seat water swivel, hydraulic fluid warp drilling rod joint hang the assembly passageway with follow behind the center tube passageway the side opening gets into the annular seal chamber of sliding sleeve top, hydraulic fluid promotes the sliding sleeve downstream is stirred go up the driving lever with down the driving lever will go up sealed ball valve with sealed ball valve closes down.
2. The deep typical weak source gas drilling continuous in situ sampling tool of claim 1, wherein: the hydraulic pressure promotes a section of thick bamboo lower extreme and is connected with the sliding block, the sliding block slide set up in the inner tube of coring with in the annular space between the urceolus.
3. The deep typical weak source gas drilling continuous in situ sampling tool of claim 2, wherein: the connecting rod mechanism comprises a first connecting rod and a second connecting rod, the upper end of the first connecting rod is fixedly connected with the lower end of the sliding block, the lower end of the first connecting rod is rotatably connected with the upper end of the second connecting rod, and the lower end of the second connecting rod is rotatably connected with the lower poking rod.
4. The deep, typical, weak source gas drilling continuous in situ sampling tool of claim 1, wherein: the suspension assembly comprises a fixed part and a rotating part, the fixed part is fixedly connected to the lower end of the drill rod joint, the suspension assembly channel is arranged in the fixed part, the rotating part is sleeved outside the fixed part in a rotating mode, and the upper end of the central pipe is fixedly connected with the lower end of the rotating part.
5. A continuous in-situ sampling method for deep typical weak source gas drilling is characterized by comprising the following steps: sampling is carried out by using the deep typical weak source gas drilling continuous in-situ sampling device of any one of claims 1 to 4, and comprises the following steps:
s1: lowering the deep typical weak source gas drilling continuous in-situ sampling tool to a gas-containing core section;
s2: performing rotary drilling, and sampling a gas-containing rock core sample in the coring inner cylinder, wherein the coring inner cylinder adopts a large-caliber long coring cylinder;
s3: the ball is thrown, the water distribution joint of the ball seat is plugged, the sliding sleeve is pushed to move downwards through hydraulic fluid, the sliding sleeve stirs the upper driving lever and the lower driving lever, and the upper sealing ball valve and the lower sealing ball valve are closed;
s4: and lifting the deep typical weak source gas drilling continuous in-situ sampling tool upwards, and taking out the upper sealing ball valve, the coring inner cylinder and the lower sealing ball valve integrally to obtain the gas-containing core sample.
6. The deep typical weak source gas drilling continuous in situ sampling method of claim 5, wherein: the core taking inner cylinder adopts a core taking cylinder with the aperture of 127-.
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| CN202210775403.8A CN114991767B (en) | 2022-07-01 | 2022-07-01 | Deep typical weak source gas drilling continuous in-situ sampling device and sampling method |
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