CN106907110B - Hot water core drilling method and device for polar region under-ice bedrock - Google Patents
Hot water core drilling method and device for polar region under-ice bedrock Download PDFInfo
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- CN106907110B CN106907110B CN201710300564.0A CN201710300564A CN106907110B CN 106907110 B CN106907110 B CN 106907110B CN 201710300564 A CN201710300564 A CN 201710300564A CN 106907110 B CN106907110 B CN 106907110B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/14—Drilling by use of heat, e.g. flame drilling
- E21B7/15—Drilling by use of heat, e.g. flame drilling of electrically generated heat
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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, core extractors
Abstract
The invention discloses a hot water coring and drilling method and a device for a bedrock under polar ice, wherein the device comprises a hot water pipe, a cable terminal, a bottom-touching detection mechanism, a water distribution joint, a back-twisting device, an electric cabin, a rock debris pipe, a screw motor, a lower double-pipe drilling tool and a drill bit; the method adopts hot water as a power medium to drive a hole bottom drilling tool to rotate so as to complete the core drilling of the bedrock, the hot water is conveyed to the hole bottom drilling tool by adopting a pipeline, meanwhile, a cable is adopted to supply power for a sensor and a communication module in the drilling tool, and the monitoring of the drilling parameters in the hole by the earth surface is realized; the rock drilling bit drills downwards through rotary grinding, and rock debris generated by drilling is carried away from the bottom of the hole by hot water and returns upwards along an annular gap between the drilling tool and the hole wall; the invention well solves the technical problem of rapid core drilling of the polar region under-ice bedrock, can rapidly drill through the ice cover to the interface of the under-ice bedrock by combining with the hot water drill, and completes core sampling drilling by replacing the bedrock hot water core drill.
Description
Technical Field
The invention relates to a hot water core drilling method and device for polar region under-ice bedrock.
Background
The Antarctic continent is one of the oldest continents on the earth, not only stores various ancient Claritong continents, but also is an ideal place for exploring the early evolution of the earth, and has remarkable scientific significance. The core of the bedrock under the ice cover is obtained and deeply analyzed, and the formation and evolution process of the crust, the history process of mutual collision and extrusion of continents, the plate structure theory and the like can be deduced, so that the history of the geological structure of the Antarctic inland is known, and the freeze thawing, the sliding and the deformation speed of the Antarctic ice layer, the glacier dynamics and the climate change have very important significance.
Currently, there is no country that has successfully drilled samples of sub-ice sedimentary rock on the inland of south Pole. Due to the extremely low temperature of the earth surface of the polar region and glaciers, the adverse conditions of difficult traffic, poor materials, bad weather, complex stratum environment and the like, great difficulty is brought to the drilling work. However, the time of each working season of the polar region is short, the time of years or even decades is usually required for drilling through the ice cover to reach the bedrock interface by adopting the conventional method, and the core with a plurality of hole sites is difficult to obtain. It is urgent to develop drilling equipment that can quickly drill to the ice rock interface and complete the sampling of bedrock.
The invention provides a hot water core drilling method and device for polar region under-ice bedrock. The method and the device can be used in combination with a hot water drill system, firstly, the hot water drill is adopted to quickly drill through an ice cover to reach an ice rock interface, and then the hot water core drill is adopted to carry out bedrock core drilling, so that the aim of quickly and efficiently sampling is fulfilled.
Disclosure of Invention
The invention aims to provide a hot water core drilling method for a bedrock under polar region ice.
The invention also provides a hot water core drilling device for the polar region under-ice bedrock.
The invention relates to a hot water core drilling method for polar region under-ice bedrock, which comprises the following steps: the hot water is used as a power medium to drive the hole bottom drilling tool to rotate so as to complete the core drilling of the bedrock, the hole bottom power device can be a screw motor or a turbine motor, the hot water is conveyed to the hole bottom drilling tool through a pipeline, meanwhile, a cable is used for supplying power for a sensor and a communication module in the drilling tool, and the monitoring of ground surface drilling parameters in holes is realized. The rock creeps into the drill bit and adopts bionical diamond bit, creep into downwards through the gyration grinding, the detritus that creeps into the production simultaneously is taken from the hole bottom by the hot water, and go back on along drilling tool and pore wall annular gap, the drilling tool top design is by special detritus collection device, the device utilizes the hydrodynamics theory to design, the drilling tool diameter in detritus collection device upper portion diminishes, the detritus collection device is flowed through to the hot water when carrying the detritus, hot water velocity of flow reduces, the detritus relies on gravity to fall to in the detritus collection device. When the method is adopted for drilling, a back-twisting device needs to be designed above the drilling tool to prevent the upper drilling tool from rotating when a drill bit drills, but a large-torque back-twisting device needs to be designed because the core drilling back-twisting device needs to overcome large drilling torque.
The invention relates to a hot water coring drilling device for bedrock under polar region ice, which comprises a hot water pipe, a cable terminal, a bottom contact detection mechanism, a water distribution joint, a back-twist device, an electric cabin, a rock debris pipe, a screw motor, a lower double-pipe drilling tool and a drill bit;
the hot water pipe and the cable are bound together and are put down, the hot water pipe is a hot water channel, surface hot water is sent to the drilling tool through the hot water pipe, the cable provides power for the drilling tool, and signal communication between the surface and the drilling tool is completed; the cable terminal is used for connecting the cable and the drilling tool, the bottom contact detection mechanism is provided with the displacement sensor and the spring mechanism, the compression amount of the spring is detected through the displacement sensor, so that the tension value borne by the cable is calculated, when the tension borne by the cable is equal to the gravity, the drilling tool is in a suspension state, when the tension borne by the cable is smaller than the gravity, the drilling tool reaches the bottom of the hole, and at the moment, water can be introduced for drilling. The water diversion connector is connected with the hot water pipe and used for guiding hot water in the hot water pipe into the drilling tool.
The anti-twisting device is of a plate-shaped anti-twisting type, three rectangular anti-twisting plates are uniformly distributed along the radial direction, each anti-twisting plate consists of an anti-twisting sheet and a hot melting sheet, a heating element is embedded in each hot melting sheet, and each heating element is connected with the electric cabin through a heating element cable. The antitorque piece and the hot melt piece are respectively fixed on the outer tube of the antitorque device by screws. The electric cabin is a high-pressure-resistant sealed cabin, normal-pressure air is filled in the electric cabin, the signal acquisition and communication module in the drilling tool is installed in the electric cabin, and the temperature and pressure sensors are installed for detecting the temperature and the water pressure of hot water in the drilling tool. The rock debris pipe fixing seat is connected with the anti-torsion device, and the rock debris pipe is connected to the rock debris pipe fixing seat through threads.
The screw motor is a rotary power source of the drilling tool, a shell of the screw motor is connected with the rock debris pipe fixing seat and is kept to be not rotated during drilling, a screw in the screw motor is driven to rotate under hot water and is connected with the lower drilling tool through an output shaft of the screw motor, and the lower drilling tool and a drill bit are driven to rotate and cut to finish drilling and sampling. The screw motor has an outer tube.
In order to reduce the influence of the rotation of the drilling tool on the quality of the rock core as much as possible, the drilling tool at the lower part is designed into a single-action double-pipe structure, namely, the outer pipe of the drilling tool drives the drill bit to rotate to drill during drilling, and the rock core pipe does not rotate so as to reduce the abrasion to the ice core. The concrete structure of the drilling tool comprises a rotary joint, a sealing ring, a bearing retaining ring, a single-action joint, a locking nut, a one-way ball valve, a drilling tool outer pipe and a rock core pipe. The upper part of the rotary joint is connected with an output shaft of the screw motor through a flat key, the outer pipe of the drilling tool is connected with the rotary joint through threads, and the output shaft of the screw motor, the rotary joint, the outer pipe of the drilling tool and the drill bit keep synchronous rotation. The rock core pipe is connected with the single-action joint through threads, two sets of bearings are matched with the rotating joint mandrel in the single-action joint, and the two sets of bearings are limited by the bearing retainer rings. The sealing ring can ensure that hot water cannot enter the ice core pipe from a gap between the single-action joint and the rotary joint. The lower part of the rotary joint is provided with threads, and the limit of the single-action joint can be realized through a locking nut. The drill bit is connected to the bottom of the outer pipe of the drilling tool through threads.
The working process of the invention is as follows:
when drilling downwards, firstly, the drilling tool is placed into the hole by using the surface winch and is continuously placed downwards, the bottom contact pressure value fed back by the bottom contact detection mechanism is observed at any time in the downward placing process, when the bottom contact pressure is continuously increased to be equal to the weight of the drilling tool, the drilling tool is shown to reach the bottom of the hole, the downward placing is stopped at the moment, and hot water is pumped into the drilling tool through the hot water pipe to start the drilling.
Hot water enters the drilling tool from the water distribution joint, flows through the upper anti-twisting device, the electric cabin and the rock debris pipe fixing seat to reach the screw motor, and drives the screw motor to rotate so as to provide power for drilling. The hot water flowing out of the screw motor continuously enters the gap between the outer pipe of the drilling tool and the ice core pipe through the water channel in the rotary joint and is sprayed out from the bottom of the drill bit.
When creeping into, the screw motor output shaft drives drilling tool outer tube and drill bit to carry out the gyration cutting through rotary joint and accomplishes and creep into, the detritus that creeps into the production is taken it from the hole bottom and is gone up along drilling tool and pore wall annular gap by spun hot water and returns, thereby guarantee the hole bottom clean, it is possible to creep into for the high-efficient core, when the hot water that carries the detritus flows through the detritus pipe, because the drilling tool diameter reduces, the hot water velocity of flow reduces, lead to hot water to the detritus power of carrying to reduce, the detritus will subside to in the core pipe under the action of gravity, realize the purpose of collecting the detritus. A rock core sample generated by drilling enters the rock core pipe, and in order to prevent water stored in the rock core pipe from generating hydrostatic pressure on the rock core and reduce the drilling speed, a one-way valve is arranged at the center of the rotary joint. When the pressure of the water stored in the rock core pipe reaches a certain value, the one-way ball valve is opened, and the water stored in the rock core pipe is discharged out of the drilling tool through the central water channel of the rotary joint.
In the drilling process, the electric cabin is controlled to supply power to the heating element, the heating element generates heat and heats the hot melt piece to high temperature, the hot melt piece is thermally melted in the hole wall to form an elongated slot under the action of the high temperature of the hot melt piece as the radial sizes of the anti-torsion piece and the hot melt piece are larger than the diameter of the drilled hole, and the anti-torsion piece and the hot melt piece move downwards along the elongated slot formed by the hot melt piece and provide reactive torque required by drilling. Because the depth of the long groove can be preset, the anti-twisting device can provide far larger anti-torque than other anti-twisting devices, and the requirement of drilling large torque on the rock bedrock under ice can be met.
The invention has the beneficial effects that:
the invention well solves the technical problem of rapid core drilling of the polar region under-ice bedrock, can rapidly drill through the ice cover to the interface of the under-ice bedrock by combining with the hot water drill, and replaces the bedrock hot water core drill to complete core sampling and drilling. The invention provides a new technical means for researching the polar region ice rock environment and has an important effect on accelerating the development of polar region research.
The invention adopts the hot-melting plate type anti-twisting device, the deep groove is formed on the hole wall through hot melting of the anti-twisting device, the anti-twisting sheet and the deep groove interact to provide reaction torque, and the requirement of large torque during drilling of bedrock can be met.
Drawings
FIG. 1 is a schematic view of a hot water core drill for polar ice bedrock.
Detailed description of the preferred embodiments
The invention relates to a hot water core drilling method for polar region under-ice bedrock, which comprises the following steps: the hot water is used as a power medium to drive the hole bottom drilling tool to rotate so as to complete the core drilling of the bedrock, the hole bottom power device can be a screw motor or a turbine motor, the hot water is conveyed to the hole bottom drilling tool through a pipeline, meanwhile, a cable is used for supplying power for a sensor and a communication module in the drilling tool, and the monitoring of ground surface drilling parameters in holes is realized. Rock creeps into the drill bit and adopts bionical diamond bit, creep into downwards through the gyration grinding, creep into the detritus that produces simultaneously and be got rid of the hole bottom by the hot water tape, and go back on along drilling tool and pore wall annular gap, the design of drilling tool top is by special detritus collection device, the device utilizes the hydrodynamics theory to design, detritus collection device upper portion drilling tool diameter diminishes, the hot water flow through detritus collection device when carrying the detritus, the hot water velocity of flow reduces, the detritus relies on gravity whereabouts to in the detritus collection device. When the method is adopted for drilling, a torque reversing device needs to be designed above the drilling tool to prevent the upper drilling tool from rotating when the drill bit drills, but the core drilling torque reversing device needs to overcome larger drilling torque, so that a large-torque reversing device needs to be designed.
Referring to fig. 1, the polar region ice layer hot water coring drilling device comprises a hot water pipe 1, a cable 2, a cable terminal 3, a bottoming detection mechanism 4, a water diversion joint 5, a torque reversing device 6, an electrical cabin 12, a rock debris pipe 13, a screw motor 15, a lower double-pipe drilling tool and a drill bit 28, wherein the hot water pipe 1 and the cable 2 are bound together and are lowered, the hot water pipe 1 is a hot water channel, surface hot water is sent to the drilling tool through the hot water pipe 1, and the cable 2 provides electric power for the drilling tool and completes signal communication between the surface and the drilling tool; the cable terminal 3 is used for connecting the cable 2 and the drilling tool, the bottoming detection mechanism 4 is installed by a displacement sensor and a spring mechanism, the compression amount of the spring is detected through the displacement sensor, and therefore the tension value borne by the cable 2 is obtained through calculation, when the tension borne by the cable 2 is equal to the gravity, the drilling tool is in a suspension state, and when the tension borne by the cable 2 is smaller than the gravity, the drilling tool reaches the bottom of a hole, and at the moment, water can be fed for drilling. The water diversion connector 5 is connected with the hot water pipe 1 and is used for guiding hot water in the hot water pipe 1 into the drilling tool.
The anti-twist device 6 is of a plate-shaped anti-twist type, three rectangular anti-twist plates are uniformly distributed along the radial direction, each anti-twist plate consists of an anti-twist sheet 8 and a hot melt sheet 9, a heating element 10 is embedded in the hot melt sheet 9, and the heating element 10 is connected with an electric cabin 12 through a heating element cable 11. The antitorque piece 8 and the hot melt piece 9 are respectively fixed on the outer tube of the anti-button device by screws 7. The electric cabin 12 is a high pressure resistant sealed cabin, normal pressure air is filled in the electric cabin, signal acquisition and communication modules in the drilling tool are all installed in the electric cabin 12, and temperature and pressure sensors are installed for detecting the temperature and the water pressure of hot water in the drilling tool. Rock debris pipe fixing seat 14 links to each other with anti-device 6 of turning round, and rock debris pipe 13 passes through threaded connection on rock debris pipe fixing seat 14.
A screw motor 15 is a rotary power source of the drilling tool, the shell of the screw motor 15 is connected with a rock debris pipe fixing seat 14 and is kept to be not rotated during drilling, and a screw in the screw motor rotates under the drive of hot water and is connected with a lower drilling tool through a screw motor output shaft 16 to drive the lower drilling tool and a drill bit 28 to rotate and cut to complete drilling and sampling; the screw motor 15 has an outer tube 17.
In order to reduce the influence of the rotation of the drilling tool on the quality of the rock core as much as possible, the drilling tool at the lower part is designed into a single-action double-pipe structure, namely, the outer pipe of the drilling tool drives the drill bit to rotate to drill during drilling, and the rock core pipe does not rotate so as to reduce the abrasion to the ice core. The concrete structure of the device comprises a rotary joint 19, a sealing ring 20, a bearing 21, a bearing retaining ring 22, a single-action joint 23, a locking nut 24, a one-way ball valve 25, a drilling tool outer pipe 26 and a rock core pipe 27. Wherein the upper part of the rotary joint 19 is connected with the output shaft 16 of the screw motor through a flat key 18, the outer pipe 26 of the drilling tool is connected with the rotary joint 19 through threads, and the output shaft 16 of the screw motor, the rotary joint 19, the outer pipe 26 of the drilling tool and the drill bit 28 keep synchronous rotation. The core barrel 27 is connected with the single acting joint 23 through screw threads, two sets of bearings 21 are matched with the mandrel of the rotating joint 19 in the single acting joint 23, and the two sets of bearings 21 are limited by the bearing retaining ring 22. The sealing ring 20 ensures that hot water does not enter the icebox from the gap between the single action joint 23 and the swivel joint 19. The lower part of the rotary joint 19 is provided with threads, and the limit of the single-action joint 23 can be realized through a locking nut 24. The drill bit 28 is threaded into the bottom of the outer tube 26.
The working process of the invention is as follows:
when the drilling tool drills downwards, the drilling tool is firstly placed into the hole by using the surface winch and continuously placed downwards, the bottoming pressure value fed back by the bottoming detection mechanism 4 is observed at any time in the downward placing process, when the bottoming pressure continuously increases to be equivalent to the weight of the drilling tool, the drilling tool reaches the bottom of the hole, the downward placing is stopped at the moment, and hot water is pumped into the drilling tool through the hot water pipe 1 to start drilling.
Hot water enters the interior of the drilling tool from the water distribution joint 5, flows through the upper anti-twisting device 6, the electric cabin 12 and the rock debris pipe fixing seat 14 to reach the screw motor 15, and drives the screw motor to rotate so as to provide power for drilling. The hot water from the screw motor continues to pass through the water channel inside the rotary joint 19 into the gap between the outer tube 26 of the drilling tool and the ice core tube 27 and is ejected from the bottom of the drill bit 28.
During drilling, the screw motor output shaft 16 drives the outer pipe 26 of the drilling tool and the drill bit 28 to perform rotary cutting through the rotary joint 19 to finish drilling, rock debris generated by drilling is carried away from the bottom of a hole by sprayed hot water and returns upwards along the annular gap between the drilling tool and the hole wall, so that the bottom of the hole is ensured to be clean, high-efficiency core drilling is possible, when the hot water carrying the rock debris flows through the rock debris pipe 13, the diameter of the drilling tool is reduced, the flow rate of the hot water is reduced, the carrying force of the hot water on the rock debris is reduced, the rock debris is settled in the rock debris pipe 13 under the action of gravity, and the purpose of collecting the rock debris is realized. The core sample produced by drilling enters the core barrel 27, and in order to prevent the water stored in the core barrel 27 from generating hydrostatic pressure on the core and reduce the drilling speed, the center of the rotary joint 19 is provided with a one-way valve. When the pressure of the water in the core barrel 27 reaches a certain value, the one-way ball valve 19 is opened, and the water in the core barrel 27 is discharged out of the drilling tool through the central water channel of the rotary joint 19.
In the drilling process, the electric cabin 12 is controlled to supply power to the heating element 10, the heating element 10 generates heat and heats the hot melt sheet 9 to high temperature, the heat melt sheet 9 is melted in the hole wall to form a long groove under the action of the high temperature of the hot melt sheet 9 due to the fact that the radial size of the antitwist sheet 8 and the radial size of the hot melt sheet 9 are larger than the diameter of a drilled hole, the antitwist sheet 8 and the hot melt sheet 9 move downwards along the long groove formed by hot melt, and the antitwist torque required by drilling is provided. Because the depth of the long groove can be preset, the anti-twisting device can provide far larger anti-torque than other anti-twisting devices, and the requirement of drilling large torque on the rock bedrock under ice can be met.
Claims (1)
1. A hot water core drilling method for bedrock under polar region ice comprises a hot water pipe (1), a cable (2), a cable terminal (3), a bottom-touching detection mechanism (4), a water distribution joint (5), an anti-twisting device (6), an electric cabin (12), a rock debris pipe (13), a screw motor (15), a lower double-pipe drilling tool and a drill bit (28), wherein the hot water pipe (1) and the cable (2) are bound together and are placed down, the hot water pipe (1) is a hot water channel, surface hot water is sent to the drilling tool through the hot water pipe (1), the cable (2) provides electric power for the drilling tool, and signal communication between the surface of the earth and the drilling tool is completed; the cable terminal (3) is used for connecting the cable (2) and the drilling tool, the bottom contact detection mechanism (4) is provided with a displacement sensor and a spring mechanism, the compression amount of the spring is detected through the displacement sensor, so that the tension value borne by the cable (2) is calculated, when the tension borne by the cable (2) is equal to the gravity, the drilling tool is in a suspension state, when the tension borne by the cable (2) is smaller than the gravity, the drilling tool reaches the bottom of a hole, and at the moment, water can be introduced for drilling; the water diversion joint (5) is connected with the hot water pipe (1) and is used for guiding hot water in the hot water pipe (1) into the drilling tool;
the anti-twisting device (6) is of a plate-shaped anti-twisting type, three rectangular anti-twisting plates are uniformly distributed along the radial direction, each anti-twisting plate consists of an anti-twisting sheet (8) and a hot melting sheet (9), a heating element (10) is embedded in the hot melting sheet (9), and the heating element (10) is connected with the electric cabin (12) through a heating element cable (11); the anti-torsion sheet (8) and the hot melt sheet (9) are respectively fixed on the outer tube of the anti-button device by screws (7); the electric cabin (12) is a high-pressure-resistant sealed cabin, normal-pressure air is filled in the electric cabin, the signal acquisition and communication modules in the drilling tool are arranged in the electric cabin (12), and the temperature and pressure sensors are arranged for detecting the temperature and the water pressure of hot water in the drilling tool; the rock debris pipe fixing seat (14) is connected with the anti-twisting device (6), and the rock debris pipe (13) is connected to the rock debris pipe fixing seat (14) through threads;
the screw motor (15) is a rotary power source of the drilling tool, the shell of the screw motor (15) is connected with the rock debris pipe fixing seat (14) and is kept against rotation during drilling, a screw in the screw motor is driven by hot water to rotate and is connected with a lower drilling tool through a screw motor output shaft (16) to drive the lower drilling tool and a drill bit (28) to rotate and cut to finish drilling sampling; the screw motor (15) has an outer tube (17);
the lower drilling tool comprises a rotary joint (19), a sealing ring (20), a bearing (21), a bearing retaining ring (22), a single-action joint (23), a locking nut (24), a one-way ball valve (25), a drilling tool outer tube (26) and a rock core tube (27), the upper part of the rotary joint (19) is connected with a screw motor output shaft (16) through a flat key (18), the drilling tool outer tube (26) is connected with the rotary joint (19) through threads, and the screw motor output shaft (16), the rotary joint (19), the drilling tool outer tube (26) and a drill bit (28) keep synchronous rotation; the rock core pipe (27) is connected with the single-action joint (23) through threads, two sets of bearings (21) are matched with the mandrel of the rotary joint (19) in the single-action joint (23), and the two sets of bearings (21) are limited by the bearing retaining ring (22); the sealing ring (20) can ensure that hot water cannot enter the ice core pipe from a gap between the single-action joint (23) and the rotary joint (19); the lower part of the rotary joint (19) is provided with a thread, and the limit of the single-action joint (23) can be realized through a locking nut (24); the drill bit (28) is connected to the bottom of the outer pipe (26) of the drilling tool through threads, and is characterized in that:
the method comprises the following steps: hot water is used as a power medium to drive a hole bottom drilling tool to rotate so as to complete bedrock coring drilling, a hole bottom power device can be a screw motor or a turbine motor, the hot water is conveyed to the hole bottom drilling tool by adopting a pipeline, meanwhile, a cable is used for supplying power for a sensor and a communication module in the drilling tool, and monitoring of drilling parameters in holes by the earth surface is realized; the rock creeps into the drill bit and adopts bionical diamond bit, creep into downwards through the gyration grinding, the detritus that creeps into the production simultaneously is taken the hole bottom from the hole by the hot water, and go back on along drilling tool and pore wall annular gap, the drilling tool top design is by special detritus collection device, the device utilizes the hydrodynamics theory to design, detritus collection device upper portion drilling tool diameter diminishes, the detritus collection device is flowed through to the hot water that carries the detritus, hot water velocity of flow reduces, the detritus relies on gravity whereabouts to in the detritus collection device, anti-twist device is designed above the drilling tool, prevent that the upper portion drilling tool from taking place to rotate when the drill bit creeps into.
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| CN103278347A (en) * | 2013-06-26 | 2013-09-04 | 吉林大学 | Polar ice drill electric mechanical drill multifunctional test platform |
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