CN108360991B - Water pressure triggering type multi-point hot water core drill bit at bottom of ice layer - Google Patents
Water pressure triggering type multi-point hot water core drill bit at bottom of ice layer Download PDFInfo
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- CN108360991B CN108360991B CN201810248061.8A CN201810248061A CN108360991B CN 108360991 B CN108360991 B CN 108360991B CN 201810248061 A CN201810248061 A CN 201810248061A CN 108360991 B CN108360991 B CN 108360991B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 126
- 238000005553 drilling Methods 0.000 claims abstract description 78
- 238000007789 sealing Methods 0.000 claims abstract description 7
- 238000005070 sampling Methods 0.000 abstract description 14
- 238000010276 construction Methods 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 7
- 230000009471 action Effects 0.000 description 6
- 239000013535 sea water Substances 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 238000002679 ablation Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
Classifications
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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
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Earth Drilling (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
A water pressure triggering type multi-point hot water core drill at the bottom of an ice layer comprises a hot water pipe, a drill water inlet pipe, a water inlet pipe centralizing block, a water retaining cap, an upper outer pipe, a piston cylinder body, a sealing ring, a piston rod centralizing block, a sliding support, a centralizing rod, a spring, a fixed support, a drill bit, a clamp pin shaft, a clamp spring fixing screw, a drill bit connecting screw, a hose, a rotating pin shaft, a supporting rod, an ice core pipe, a top rod, a lower outer pipe and a screw. The invention adopts a pressure triggering mode, so that after the drilling tool reaches the hole bottom, three carried ice core tubes are opened, drilling sampling is completed, and the drilling tool can be lowered for multiple times to carry out multipoint sampling, so that the hole bottom sampling amount of the same drilling hole is greatly increased. The invention has reliable operation and convenient operation, is matched with a hot water drill system to be used, completes multi-point and multi-time sampling of the hole bottom under the condition of not increasing earth surface equipment, greatly reduces the construction cost, and has less wearing parts of the whole set of drilling tool and long service life.
Description
Technical Field
The invention relates to a water pressure triggering type multi-point hot water core drill bit at the bottom of an ice layer.
Background
Currently approximately 11% of the earth's land surface is covered by layers of ice, including glaciers, ice crowns, and ice covers of south poles and Greenland islands. The effects of polar ice cap material balance and changes on global climate change accumulate a vast amount of data and information. The material balance of the ice frame is one of the main processes of the dynamic change of the ice cover, and the accurate grasping of the material balance process of the ice frame can accurately and quantitatively study the dynamic change of the polar ice cover and the influence of the dynamic change on the global environment change (sea level, ocean current circulation, atmosphere circulation and the like). The material balance process of the ice frame mainly comprises glacier ice flow input, ice frame surface accumulation and ablation, ice frame front edge cracking, freeze thawing of the bottom of the ice frame and the like, and the ice mountain fracture generated at the ice frame front edge can be performed through satellite remote sensing and aerial survey data. However, it is difficult to directly observe melting and freezing of the bottom of the ice bank, and so far, the direct observation of the bottom of the ice bank is performed only in a limited number of places, mostly by punching holes, drilling holes or naturally formed ice cracks. If the ice core sample at the bottom of the ice frame can be obtained, the physical and chemical analysis can be carried out, and the method plays an important role in researching the material balance process at the bottom of the ice frame and the interaction mechanism of the ice frame and the ocean. At present, most of the internationally adopted drilling and sampling modes are hot water drills with highest efficiency, and coring drilling is performed near the bottom layer when the hot water drills spray ice melting holes, but a conventional hot water drill system can only acquire one ice core in the same drilling hole at the same layer, so that the sampling amount is small, and the requirements of scientists on samples cannot be met.
Disclosure of Invention
The invention aims to provide a water pressure triggering type multi-point hot water core drill bit at the bottom of an ice layer. The invention is designed based on a hot water drilling system, firstly, a hot water drill is used for forming holes, then a drilling tool is put into the holes, the core drilling tool is opened in a water pressure triggering mode after the drilling tool reaches the bottom of the ice frame, and drilling and sampling are finished from bottom to top through the drilling tool. The invention is matched with a hot water drilling system for use, can well finish coring drilling of the ice frame or the ice layer at the bottom of the ice layer under the condition of not increasing surface equipment, has simple structure, high drilling efficiency and large sampling amount, and can greatly reduce cost.
A water pressure triggering type multi-point hot water core drill at the bottom of an ice layer comprises a hot water pipe, a drill water inlet pipe, a water inlet pipe centralizing block, a water retaining cap, an upper outer pipe, a piston cylinder body, a sealing ring, a piston rod centralizing block, a sliding support, a centralizing rod, a spring, a fixed support, a drill bit, a clamp pin shaft, a clamp spring fixing screw, a drill bit connecting screw, a hose, a rotating pin shaft, a supporting rod, an ice core pipe, a push rod, a lower outer pipe and a screw;
the hot water pipe is connected with the upper part of the drilling tool water inlet pipe, the lower part of the drilling tool water inlet pipe is connected with the piston cylinder body by adopting threads, the water inlet pipe righting block is fixed at the top of the upper outer pipe by an M8 screw, an inner hole of the water inlet pipe righting block has a righting effect on the drilling tool water inlet pipe, the upper part of the upper outer pipe is also fixed with a water retaining cap by an M5 screw, and the lower end of the upper outer pipe is fixed on the piston cylinder body by the M8 screw;
the piston is arranged in the piston cylinder body, two sealing rings are arranged on the piston, the lower end of the piston is fixedly provided with a piston rod through threads, the piston and the piston rod can freely slide up and down along the axial direction of the piston cylinder body, and a piston rod righting block is fixed at the lower end part of the piston cylinder body through an M6 screw to play a role in righting the movement of the piston rod; the lower part of the piston rod is connected with a sliding support through threads, the upper part of the guide rod is matched with the inner hole of the piston rod, the lower part of the guide rod is fixed on a fixed support through threads, a spring is arranged between the sliding support and the fixed support, the fixed support is fixed with a lower outer tube through an M8 screw, and the upper part of the lower outer tube is fixed with a piston rod righting block; one end of the ejector rod is hinged with the sliding support through a rotating pin shaft, the other end of the ejector rod is connected with the middle part of the support rod through a rotating pin shaft, two ends of the support rod are respectively connected with the fixed support and the ice core pipe through rotating pin shafts, all the rotating pin shafts are provided with locking screws for positioning the ice core pipe, and long grooves are formed in the arrangement direction of the support rod and the ejector rod through the lower outer pipe, so that the support rod and the ejector rod are allowed to move up and down in the grooves.
The upper part of the ice core pipe is connected with a drill bit through a drill bit fixing screw, the snap-off device is fixed on the drill bit through a snap-off device pin shaft, the snap spring is fixed on the drill bit through a snap spring fixing screw, and the snap-off device is limited, so that the snap-off device can only rotate towards the inner direction of the drill bit, and three groups of the snap-off device, the snap-off device pin shaft, the snap spring and the snap spring fixing screw are uniformly distributed along the radial direction of the drill bit; the water inlet of the ice core tube is connected with the water outlet of the piston cylinder body through a hose, and the water outlet of the ice core tube is connected with the water inlet of the drill bit through a water conduit.
In order to increase the sampling amount of the single drilling ice core, the ice core pipe and the drill bit are uniformly distributed in the radial direction of the drilling tool, and are respectively connected with the sliding support and the fixed support through the supporting rod, the ejector rod and the rotating pin shaft.
The working process of the invention comprises the following steps:
before the drilling tool is used, a hot water drill is used for drilling holes in the polar region ice frame, the ice frame is successfully penetrated, the drilled holes are communicated with seawater below the ice frame, a hot water drill hot water pipeline is connected with a drilling tool water inlet pipe at the moment, and the drilling tool is lowered into the holes by adopting an earth surface hot water pipeline winch. At this time, because hot water is not introduced into the drilling tool, the piston rod and the sliding support are in an upper position under the action of the spring, the ice core pipe is in a retracted state, and the whole diameter of the drilling tool is smaller than the diameter of a hot water drilling hole, so that the drilling tool can be lifted and lowered in the drilling hole.
When the drilling tool passes through the bottom of the ice frame and enters into seawater below the ice frame, hot water is pumped into the drilling tool by using a surface hot water pump, the hot water passes through a hot water pipeline and a drilling tool water inlet pipe to reach an upper cavity of a piston cylinder body, the piston starts to move downwards under the action of hot water pressure and pushes a sliding support to compress a spring and move downwards through a piston rod, and as the sliding support, the ejector rod, the supporting rod and the fixed support form a connecting rod mechanism, when the sliding support moves downwards, the ejector rod pushes the supporting rod to rotate around a hinge point of the fixed support, so that the ice core pipe is outwards opened. When the piston descends below the opening of the side wall of the piston cylinder body, hot water enters the side cavity from the upper cavity of the piston cylinder body, enters the side water cavity of the ice core pipe through the hose, then enters the drill bit through the water guide pipe, and is sprayed out, at the moment, the water pressure of the upper cavity of the piston cylinder body is kept unchanged due to the fact that the hot water is released, meanwhile, under the action of spring force, the piston does not move downwards any more, the position is kept unchanged, and the ice core pipe is opened to the maximum position.
When the ice core pipe is opened to the maximum position, the distribution diameter of the three ice core pipes is far larger than the drilling diameter, the drilling tool is slowly lifted at the moment, and the hot water is always sprayed out from the drill bit, so that annular ice holes can be melted from bottom to top in the ice layer at the bottom of the ice frame, and the ice core enters the ice core pipe. When the drill bit drives the breaker to move downwards, the breaker rotates around the breaker pin shaft and cuts into the ice core, so that the ice core is separated from the ice layer, and the fallen ice core is collected in the ice core pipe.
And continuously lowering the drilling tool until the core tube exits from the drilling hole and returns to the seawater below the ice frame again, stopping hot water supply at the moment, reducing the water pressure in the upper cavity of the piston cylinder body, moving the piston, the piston rod and the sliding support upwards under the action of spring force, and driving the core tube to retract inwards through the ejector rod and the support rod until the piston moves upwards to be in contact with the top surface of the upper cavity of the piston cylinder body and stops, and shrinking the core tube to the minimum diameter at the moment. And starting the surface hot water pipeline winch to lift the drilling tool to the surface and finish coring, and in the lifting process, the diameter of the ice core pipe is smaller than that of the water retaining cap, so that the water flow is prevented from scouring the ice core in the ice core pipe, and the ice core sample is protected to the greatest extent.
The invention has the beneficial effects that:
the invention well solves the problem of difficult collection of the ice layer sample at the bottom of the polar region ice frame, the designed drilling tool adopts a pressure triggering mode, so that after the drilling tool reaches the bottom of a hole, three carried ice core tubes are opened, drilling sampling is completed, and the drilling tool can be lowered for multiple times to carry out multipoint sampling, so that the sampling quantity of the bottom of the hole of the same drilling hole is greatly increased.
The invention has simple structure, reliable work and convenient operation, is matched with a hot water drill system to be used, completes multi-point and multi-time sampling of the hole bottom under the condition of not increasing surface equipment, greatly reduces the construction cost, and has less wearing parts of the whole set of drilling tool and long service life.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic view of the drilling state of the present invention.
Detailed Description
Referring to fig. 1 and 2, a hydraulic pressure triggering type multi-point hot water core drill for the bottom of an ice layer comprises a hot water pipe 1, a drill water inlet pipe 2, a water inlet pipe centralizing block 3, an M8 screw 4, a water retaining cap 5, an M5 screw 6, an upper outer pipe 7, a piston cylinder 8, a sealing ring 9, a piston 10, a piston rod 11, an M6 screw 12, a piston rod centralizing block 13, a sliding support 14, a centralizing rod 15, a spring 16, a fixed support 17, a drill bit 18, a breaker pin 19, a breaker 20, a clamp spring 21, a clamp spring fixing screw 22, a drill bit connecting screw 23, a water conduit 24, a hose 25, a locking screw 26, a rotating pin 27, a supporting rod 28, an ice core pipe 29, a supporting rod 30 and a lower outer pipe 31;
the hot water pipe 1 is connected with the upper part of the drilling tool water inlet pipe 2, the lower part of the drilling tool water inlet pipe 2 is connected with the piston cylinder body 8 through threads, the water inlet pipe righting block 3 is fixed at the top of the upper outer pipe 7 through an M8 screw 4, an inner hole of the water inlet pipe righting block has a righting effect on the drilling tool water inlet pipe 2, a water retaining cap 5 is fixed at the upper part of the upper outer pipe 7 through an M5 screw 6, and the lower end of the upper outer pipe 7 is fixed on the piston cylinder body 8 through the M8 screw 4;
the piston 10 is arranged in the piston cylinder 8, two sealing rings 9 are arranged on the piston 10, a piston rod 11 is fixed at the lower end of the piston 10 through threads, the piston 10 and the piston rod 11 can slide up and down freely along the axial direction of the piston cylinder 8, and a piston rod righting block 13 is fixed at the lower end part of the piston cylinder 8 through an M6 screw 12 to play a role in righting the movement of the piston rod 11; the lower part of the piston rod 11 is connected with a sliding support 14 through threads, the upper part of a guide rod 15 is matched with an inner hole of the piston rod 11, the lower part of the guide rod is fixed on a fixed support 17 through threads, a spring 16 is arranged between the sliding support 14 and the fixed support 17, the fixed support 17 is fixed with a lower outer tube 31 through an M8 screw 4, and the upper part of the lower outer tube 31 is fixed with a piston rod righting block 13; one end of a push rod 30 is hinged with the sliding support 14 through a rotating pin shaft 27, the other end of the push rod 30 is connected with the middle of a support rod 28 through the rotating pin shaft 27, two ends of the support rod 28 are respectively connected with a fixed support 17 and an ice core tube 29 through the rotating pin shaft 27, all the rotating pin shafts 27 are provided with locking screws 26 for positioning the fixed support 17 and the ice core tube, and long grooves are formed in the arrangement direction of the support rod 28 and the push rod 30 through lower outer tubes 31, so that the support rod 28 and the push rod 30 are allowed to move up and down in the grooves.
The upper part of the ice core tube 29 is connected with the drill bit 18 through a drill bit fixing screw 23, the snap device 20 is fixed on the drill bit 18 through a snap device pin 19, the snap spring 21 is fixed on the drill bit through a snap spring fixing screw 22, and limits the snap device 20, so that the snap device 20 can only rotate towards the inner direction of the drill bit 18, and three groups of the snap device 20, the snap device pin 19, the snap spring 21 and the snap spring fixing screw 22 are uniformly distributed along the radial direction of the drill bit; the water inlet of the ice core tube 29 is connected with the water outlet of the piston cylinder body 8 through a hose 25, and the water outlet of the ice core tube 29 is connected with the water inlet of the drill bit 18 through a water conduit 24.
In order to increase the sampling amount of the single drilling ice core, three groups of ice core tubes 29 and drill bits 18 are uniformly distributed along the radial direction of the drilling tool and are respectively connected with the sliding support 14 and the fixed support 17 through a supporting rod 28, a push rod 30 and a rotating pin shaft 27.
The working procedure of this embodiment is:
as shown in figure 2, the drilling tool is used for drilling holes on the polar region ice frame by adopting a hot water drill before use, and successfully penetrates through the ice frame to enable the drilling holes to be communicated with seawater under the ice frame, and at the moment, a hot water drill hot water pipeline 1 is connected with a drilling tool water inlet pipe 2, and the drilling tool is lowered into the holes by adopting a ground surface hot water pipeline winch. At this time, because hot water is not introduced into the drilling tool, the piston 10, the piston rod 11 and the sliding support 14 are in an upper position under the action of the spring 16, the ice core tube is in a retracted state, and the whole diameter of the drilling tool is smaller than the diameter of a hot water drilling hole, so that the drilling tool can be lifted and lowered in the drilling hole.
When the drilling tool passes through the bottom of the ice frame and enters into the seawater under the ice frame, hot water is pumped into the drilling tool by using a surface hot water pump, the hot water passes through the hot water pipeline 1 and the drilling tool water inlet pipe 2 to reach the upper cavity of the piston cylinder body 8, the piston 10 starts to move downwards under the action of hot water pressure, the sliding support 14 is pushed by the piston rod 11 to compress the spring 16 and move downwards, and as the sliding support 14, the ejector rod 30, the support rod 28 and the fixed support 17 form a link mechanism, when the sliding support 14 moves downwards, the ejector rod 30 pushes the support rod 28 to rotate around the hinge point of the fixed support 17, so that the ice core pipe 29 is outwards opened. When the piston descends below the side wall opening of the piston cylinder 8, hot water enters the side cavity from the upper cavity of the piston cylinder and enters the side water cavity of the ice-core tube through the hose 25, then enters the drill bit 18 through the water conduit 24 and is ejected, at the moment, the water pressure of the upper cavity of the piston cylinder 8 is kept unchanged due to the fact that the hot water is released, meanwhile, under the force of the spring 16, the piston 10 does not move downwards any more and keeps the position unchanged, and the ice-core tube 29 is opened to the maximum position.
When the ice core tube 29 is opened to the maximum position, the distribution diameter of the 3 ice core tubes is far larger than the drilling diameter, and the drilling tool is slowly lifted at the moment, and as hot water is always sprayed out from the drill bit 18, annular ice holes can be melted from bottom to top in the ice layer at the bottom of the ice frame, and the ice cores enter the ice core tube 29. When the drilling tool is drilled to the designed maximum depth, the drilling tool is slowly lowered, at the moment, the tip of the snap-off device 20 is contacted with the ice core and blocked, when the drill bit drives the snap-off device 20 to move downwards, the snap-off device 20 rotates around the snap-off pin shaft 19 and cuts into the ice core, the ice core is separated from the ice layer, and the dropped ice core is collected in the ice core pipe 29.
The drilling tool is further lowered until the core tube 29 is withdrawn from the drilling hole and returns to the seawater under the ice frame, at the moment, the hot water supply is stopped, the water pressure in the upper cavity of the piston cylinder body 8 is reduced, the piston 10, the piston rod 11 and the sliding support 14 move upwards under the force of the spring 16, the core tube 29 is driven to retract inwards by the ejector rod 30 and the support rod 28 until the piston 10 moves upwards to be in contact with the top surface of the upper cavity of the piston cylinder body 8 and stops, and at the moment, the core tube 29 is contracted to the minimum diameter. Starting the surface hot water pipeline winch to lift the drilling tool to the surface and finishing coring, and in the lifting process, the diameter of the ice core pipe 29 is smaller than that of the water retaining cap 5, so that the flushing of water flow to the ice core in the ice core pipe is avoided, and the ice core sample is protected to the greatest extent.
Claims (1)
1. A water pressure trigger type ice layer bottom multi-point hot water core drill bit which is characterized in that: the drilling tool comprises a hot water pipe (1), a drilling tool water inlet pipe (2), a water inlet pipe centralizing block (3), an M8 screw (4), a water retaining cap (5), an M5 screw (6), an upper outer pipe (7), a piston cylinder (8), a sealing ring (9), a piston (10), a piston rod (11), an M6 screw (12), a piston rod centralizing block (13), a sliding support (14), a centralizing rod (15), a spring (16), a fixed support (17), a drill bit (18), a clamp pin shaft (19), a clamp (20), a clamp spring (21), a clamp spring fixing screw (22), a drill bit connecting screw (23), a water conduit (24), a hose (25), a locking screw (26), a rotating pin shaft (27), a supporting rod (28), an ice core pipe (29), a push rod (30) and a lower outer pipe (31);
the hot water pipe (1) is connected with the upper part of the drilling tool water inlet pipe (2), the lower part of the drilling tool water inlet pipe (2) is in threaded connection with the piston cylinder body (8), the water inlet pipe righting block (3) is fixed at the top of the upper outer pipe (7) through an M8 screw (4), the drilling tool water inlet pipe (2) is righted through an inner hole of the water inlet pipe righting block, the water retaining cap (5) is fixed at the upper part of the upper outer pipe (7) through an M5 screw (6), and the lower end of the upper outer pipe (7) is fixed on the piston cylinder body (8) through the M8 screw (4);
the piston (10) is arranged in the piston cylinder body (8), two sealing rings (9) are arranged on the piston (10), a piston rod (11) is fixed at the lower end of the piston (10) through threads, the piston (10) and the piston rod (11) can slide up and down freely along the axial direction of the piston cylinder body (8), and a piston rod righting block (13) is fixed at the lower end part of the piston cylinder body (8) through an M6 screw (12) to play a role in righting the movement of the piston rod (11); the lower part of the piston rod (11) is connected with a sliding support (14) through threads, the upper part of a guide rod (15) is matched with an inner hole of the piston rod (11), the lower part of the guide rod is fixed on a fixed support (17) through threads, a spring (16) is arranged between the sliding support (14) and the fixed support (17), the fixed support (17) is fixed with a lower outer tube (31) through an M8 screw (4), and the upper part of the lower outer tube (31) is fixed with a piston rod righting block (13); one end of a push rod (30) is hinged with a sliding support (14) through a rotating pin shaft (27), the other end of the push rod (30) is connected with the middle part of a support rod (28) through the rotating pin shaft (27), two ends of the support rod (28) are respectively connected with a fixed support (17) and an ice core tube (29) through the rotating pin shaft (27), all the rotating pin shafts (27) are provided with locking screws (26) to position the locking screws, and long grooves are processed in the arrangement direction of the support rod (28) and the push rod (30) by an outer lower tube (31), so that the support rod (28) and the push rod (30) are allowed to move up and down in the grooves;
the upper part of the ice core tube (29) is connected with a drill bit (18) through a drill bit fixing screw (23), the snap device (20) is fixed on the drill bit (18) through a snap device pin shaft (19), the snap spring (21) is fixed on the drill bit through a snap spring fixing screw (22) and limits the snap device (20), so that the snap device (20) can only rotate towards the inner direction of the drill bit (18), and three groups of the snap device (20), the snap device pin shaft (19), the snap spring (21) and the snap spring fixing screw (22) are uniformly distributed along the radial direction of the drill bit; the water inlet of the ice core tube (29) is connected with the water outlet of the piston cylinder body (8) through a hose (25), and the water outlet of the ice core tube (29) is connected with the water inlet of the drill bit through a water guide pipe (24);
the core tube (29) and the drill bit (18) are uniformly distributed in three groups along the radial direction of the drilling tool and are respectively connected with the sliding support (14) and the fixed support (17) through the supporting rod (28), the ejector rod (30) and the rotating pin shaft (27).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810248061.8A CN108360991B (en) | 2018-03-24 | 2018-03-24 | Water pressure triggering type multi-point hot water core drill bit at bottom of ice layer |
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| CN201810248061.8A CN108360991B (en) | 2018-03-24 | 2018-03-24 | Water pressure triggering type multi-point hot water core drill bit at bottom of ice layer |
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| CN108360991B true CN108360991B (en) | 2023-09-19 |
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| CN109083608A (en) * | 2018-11-01 | 2018-12-25 | 吉林大学 | A kind of ice shelf bottom uphole coring system and method based on underwater robot |
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