CN108716362B - Hydraulic bearing screw drilling tool - Google Patents

Hydraulic bearing screw drilling tool Download PDF

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Publication number
CN108716362B
CN108716362B CN201810825883.8A CN201810825883A CN108716362B CN 108716362 B CN108716362 B CN 108716362B CN 201810825883 A CN201810825883 A CN 201810825883A CN 108716362 B CN108716362 B CN 108716362B
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China
Prior art keywords
transmission shaft
hole
disc
cap
drilling tool
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CN201810825883.8A
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CN108716362A (en
Inventor
张强
张雪云
武进虎
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Yangtze University
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Yangtze University
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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
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/02—Fluid rotary type drives
    • 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
    • E21B4/00—Drives for drilling, used in the borehole
    • E21B4/003—Bearing, sealing, lubricating details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C2/00—Rotary-piston engines
    • F03C2/08—Rotary-piston engines of intermeshing-engagement type, i.e. with engagement of co- operating members similar to that of toothed gearing
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy

Abstract

The invention relates to a hydraulic bearing screw drilling tool, and belongs to the technical field of power drilling tools under petroleum and natural gas wells. The device consists of an upper shell, a lower shell, a middle shell, a transmission shaft, a hollow flexible shaft and a diversion water cap, wherein a screw rotor is arranged in the upper shell, the diversion water cap is arranged below the rotary screw, the transmission shaft is arranged in the lower shell at one side of the diversion water cap, and a centralizing bearing and a thrust bearing are arranged on the transmission shaft; a movable disc is arranged on a transmission shaft between the centralizing bearing and the diversion water cap, and a static disc is arranged on the inner wall of the lower shell corresponding to the movable disc. The screw drilling tool can effectively reduce the load born by the thrust bearing, solves the problems that the thrust bearing group is easy to wear and break to lose effectiveness under the action of axial heavy load when the existing screw drilling tool works underground and the thrust bearing group runs in slurry abrasive media, influences the mechanical property and the service life of the screw drilling tool, and has positive popularization significance for improving the service life of the screw drilling tool underground.

Description

Hydraulic bearing screw drilling tool
Technical Field
The invention relates to a hydraulic bearing screw drilling tool, and belongs to the technical field of power drilling tools under petroleum and natural gas wells.
Background
The screw drilling tool is a downhole power drilling tool commonly used in petroleum and natural gas drilling operations. The screw drilling tool mainly comprises a screw motor assembly, a universal shaft assembly and a bearing joint assembly. The motor assembly consists of a stator and a rotor, and can convert the pressure energy of drilling fluid into planetary motion of the rotor; the bearing joint consists of a transmission shaft and a thrust bearing group; the universal shaft assembly converts the planetary motion of the rotor into fixed shaft rotation of the transmission shaft, so that a drill bit connected to the lower part of the transmission shaft is driven to break down the rock at the bottom of the well. When the screw drilling tool works normally, the liquid pressure at the upper end of the rotor is higher than the liquid pressure at the lower end of the rotor, so that the rotor is subjected to downward acting force, namely rotor hydraulic load, and the hydraulic load is transmitted to the transmission shaft through the universal shaft assembly; on the other hand, in order for the drill bit to break rock, a downward axial force, i.e., weight on bit, must be applied to the drill bit, with the reaction force of the weight on bit acting on the drive shaft in an upward direction. The thrust bearing set in the bearing section is used for bearing the hydraulic load of the rotor and the bit pressure acting on the drill bit. Typically the hydraulic load on the rotor is much greater than the weight on bit, so the thrust bearing set is generally forced downward. The thrust bearing group in the bearing section of the existing screw drilling tool adopts open mud lubrication, when the screw drilling tool works underground, the thrust bearing group runs in a mud abrasive medium, and under the action of axial heavy load, the thrust bearing group is easy to wear and break to lose efficacy, so that the mechanical property and the working life of the screw drilling tool are influenced, therefore, the structure of the bearing section of the screw drilling tool is improved, and the reduction of the axial load born by the thrust bearing group is an important way for improving the working life of the screw drilling tool.
Disclosure of Invention
The invention aims at: the hydraulic bearing screw drill can effectively reduce the axial hydraulic load of the rotor, reduce the abrasion degree of the thrust bearing group and the probability of fracture failure, and further improve the service life.
The invention adopts the technical scheme that:
the utility model provides a hydraulic bearing screw drilling tool, it comprises last casing, lower casing, middle casing, transmission shaft, hollow flexible axle and reposition of redundant personnel water cap, its characterized in that: an upper shell is arranged at one end of the middle shell in a threaded manner, a lower shell is arranged at the other end of the middle shell in a threaded manner, a screw rotor is movably arranged in the upper shell, and a rotor bushing is fixedly arranged on the inner wall of the upper shell corresponding to the screw rotor; a diversion water cap is arranged in the middle shell below the rotary screw rod, a hollow flexible shaft is arranged between the diversion water cap and the rotor through a short joint A and a short joint B, a transmission shaft is arranged in the lower shell at one side of the diversion water cap through a locking short joint, one end of the transmission shaft extends to the outer end of the lower shell, and the other end of the transmission shaft is in threaded connection with the diversion water cap; thrust bearings (groups) are arranged on the transmission shaft at the inner side of the locking nipple through symmetrically arranged centralizing bearings (groups); a movable disc is arranged on a transmission shaft between the centralizing bearing (group) and the diversion water cap, and a static disc is arranged on the inner wall of the lower shell corresponding to the movable disc.
The transmission shaft be the reducing body, be provided with the central through-hole on the transmission shaft, be provided with the internal thread in the lower port of transmission shaft, be provided with transmission shaft bypass hole on the transmission shaft, transmission shaft bypass hole and the central through-hole intercommunication of transmission shaft.
The transmission shaft on one side of the transmission shaft bypass hole is provided with a transmission shaft axial hole, transmission shaft radial holes are formed in the transmission shaft corresponding to the transmission shaft axial hole at intervals, and the transmission shaft radial holes are communicated with the transmission shaft axial holes.
The screw rotor is provided with a central through hole, and the top thread of the screw rotor is provided with a water inlet baffle head. The water inlet baffle head is provided with a central hole, and the central hole is radially provided with a communication hole.
The water diversion cap is a cylindrical body, a partition plate is arranged in a central hole of the water diversion cap, a water cap axial hole is axially formed in a cylinder wall of the periphery of the partition plate, the water cap axial hole is communicated with the central hole above the partition plate, a water cap radial hole is formed in the cylinder wall on one side below the partition plate, the water cap radial hole is communicated with the central hole below the partition plate, and internal threads are respectively arranged on ports of the water diversion cap above and below the partition plate.
The hollow flexible shaft is connected with the short section A and the short section B through the pin shafts respectively, the short section A is in threaded connection with the rotor, and the short section B is in threaded connection with the diversion water cap.
The movable disc consists of an upper movable disc and a lower movable disc, the upper movable disc and the lower movable disc are respectively cylindrical, movable disc flanges are arranged on the circumferences of the upper movable disc and the lower movable disc, annular grooves are formed in the inner walls of the upper movable disc and the lower movable disc on one side of each movable disc flange, and movable disc radial holes are formed in the annular grooves.
The upper static disc and the lower static disc are respectively cylindrical, static disc flanges are arranged on the inner walls of the upper static disc and the lower static disc, static disc annular grooves are formed in the outer circumferences of the upper static disc and the lower static disc, static disc radial holes are formed in the static disc annular grooves, and the static disc radial holes are communicated with the static disc annular grooves.
The invention has the beneficial effects that:
when the screw drilling tool works, a part of high-pressure drilling fluid enters a central through hole of a screw rotor from an inner runner of a water inlet baffle head, and then enters a water cap axial hole of a water diversion cap through central holes of a short joint A, a hollow flexible shaft and a short joint B; the high-pressure drilling fluid is led into the radial small hole below the movable disc flange through the radial hole of the transmission shaft on the transmission shaft, the high-pressure fluid enters the sealed cavity formed between the lower end surface of the movable disc flange and the upper end surface of the static disc flange, and the hydrostatic pressure formed by the high-pressure fluid acts on the lower end surface of the movable disc flange, so that the transmission shaft receives the thrust force upwards along the axis, the thrust direction is opposite to the hydraulic load direction of the screw rotor, the load born by the thrust bearing group can be effectively reduced, the working condition of the thrust bearing group is improved, the abrasion degree of the thrust bearing group or the occurrence of fracture failure probability is reduced, and the working life of the screw drilling tool in the pit is prolonged. The problems that the mechanical property and the service life of the screw drilling tool are influenced are solved, the thrust bearing group runs in a slurry abrasive medium when the conventional screw drilling tool works underground, and the thrust bearing group is easy to wear and break and lose efficacy under the action of axial heavy load, so that the screw drilling tool has positive popularization significance for improving the service life of the screw drilling tool underground.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is an enlarged schematic view of the structure of FIG. 1 at A;
FIG. 3 is an enlarged schematic view of the structure at B in FIG. 1;
FIG. 4 is an enlarged schematic view of the structure at C in FIG. 1;
FIG. 5 is a schematic view of the cross-sectional structure in the direction A-A in FIG. 1;
FIG. 6 is a schematic view of the B-B cross-sectional structure of FIG. 1;
FIG. 7 is a schematic view of the cross-sectional structure in the direction C-C in FIG. 1.
In the figure: 1. the upper shell, 2, the lower shell, 3, the middle shell, 4, the transmission shaft, 5, the hollow flexible shaft, 6, the diversion water cap, 7, the screw rotor, 8, the rotor bushing, 9, the water inlet baffle head, 10, the partition plate, 11, the water cap axial hole, 12, the water cap radial hole, 13, the radial communication hole, 14, the short section A,15, the short section B,16, the pin roll 16, 17, the plugging sleeve, 18, the locking short section, 19, the transmission shaft bypass hole, 20, the transmission shaft axial hole, 21, the transmission shaft radial hole, 22, the centering bearing, 23, the thrust bearing, 24, the upper movable disc, 25, the lower movable disc, 26, the movable disc flange, 27, the annular groove, 28, the movable disc radial hole, 29, the upper stationary disc, 30, the lower stationary disc, 31, the stationary disc flange, 32, the stationary disc annular groove, 33 and the stationary disc radial hole.
Detailed Description
The hydraulic bearing screw drill consists of an upper shell 1, a lower shell 2, a middle shell 3, a transmission shaft 4, a hollow flexible shaft 5 and a diversion water cap 6, wherein one end of the middle shell 3 is provided with the upper shell 1 in a threaded manner, the other end of the middle shell 3 is provided with the lower shell 2 in a threaded manner, a screw rotor 7 is movably arranged in the upper shell 1, and a rotor bushing 8 is fixedly arranged on the inner wall of the upper shell 1 corresponding to the screw rotor 7; the screw rotor 7 is provided with a central through hole, and the top thread of the screw rotor 7 is provided with a water inlet blocking head 9. So as to shunt the drilling fluid during working; the water inlet baffle head 9 is provided with a central hole, the central hole is radially provided with a communication hole, and the central hole is communicated with the communication hole.
A water diversion cap 6 is arranged in the middle shell 3 below the rotary screw rod 7. The water diversion cap 6 is a cylindrical body, a partition plate 10 is arranged in a central hole of the water diversion cap 6, 3 water cap axial holes 11 are axially uniformly distributed on the circumference of the cylinder wall of the periphery of the partition plate 10, the water cap axial holes 11 are communicated with the central hole above the partition plate 10 through radial communication holes 13, and plugs are arranged on outer ports of the radial communication holes 13, so that the water diversion cap is convenient to process and is communicated with the water cap axial holes 11. 3 radial holes 12 of the water cap are uniformly distributed on the circumference of the wall of the diversion water cap 6 below the partition plate 11, the radial holes 12 of the water cap are obliquely arranged, the radial holes of the water cap are communicated with the central hole below the partition plate 10, and internal threads are respectively arranged at the ports of the diversion water caps above and below the partition plate 10.
The hollow flexible shaft 5 is arranged between the water diversion cap 6 and the screw rotor 7 through the short joint A14 and the short joint B15, the hollow flexible shaft 5 is respectively connected with the short joint A14 and the short joint B15 through the pin shaft 16, and the plugging sleeve 17 is arranged on the short joint A14 and the short joint B15 corresponding to the pin shaft 16 in a threaded manner so as to limit the pin shaft 16 and prevent the pin shaft 16 from slipping.
The nipple A14 is in threaded connection with the screw rotor 7, and the nipple B15 is in threaded connection with the diversion water cap 6.
The lower shell 2 below the diversion water cap 6 is internally provided with a transmission shaft 4 through a locking nipple 18, one end of the transmission shaft 4 extends to the outer end of the lower shell 2, and the other end of the transmission shaft 4 is in threaded connection with the diversion water cap 6. The transmission shaft 4 is a reducing body, a central through hole is formed in the transmission shaft 4, internal threads are arranged in the lower port of the transmission shaft 4, a transmission shaft bypass hole 19 is formed in the transmission shaft 4, and the transmission shaft bypass hole 19 is communicated with the central through hole of the transmission shaft 4.
3 transmission shaft axial holes 20 are uniformly distributed on the circumference of the transmission shaft 4 at one side of the transmission shaft bypass hole 19, and the transmission shaft axial holes 20 are communicated with the water cap axial holes 11. And 2 radial holes 21 of the transmission shaft are arranged on the transmission shaft 4 corresponding to the axial holes 20 of the transmission shaft at intervals, and the radial holes 21 of the transmission shaft are communicated with the axial holes 20 of the transmission shaft.
A thrust bearing 23 is arranged on the transmission shaft 4 at the inner side of the locking nipple 18 through a centralizing bearing 22 which is symmetrically arranged; a movable disc is fixedly arranged on the transmission shaft 4 between the centralizing bearing 22 and the diversion water cap 6, the movable disc consists of an upper movable disc 24 and a lower movable disc 25 which are mutually attached and connected, the upper movable disc 24 and the lower movable disc 25 are respectively in a cylinder shape, movable disc flanges 26 are respectively arranged on the circumferences of the upper movable disc 24 and the lower movable disc 25, annular grooves 27 are correspondingly arranged on the inner walls of the upper movable disc 24 and the lower movable disc 25 on one side of the movable disc flanges 26 and correspond to the radial holes 21 of the transmission shaft, and the annular grooves 27 are provided with movable disc radial holes 28; the radial hole 28 of the movable disk is communicated with the radial hole 21 of the transmission shaft through the annular groove 27; the purpose of the ring groove 27 is to maintain the communication state between the movable disk radial hole 28 and the transmission shaft radial hole 21, and avoid the situation that the movable disk radial hole 28 and the transmission shaft radial hole 21 are dislocated in the circumferential direction and cannot communicate.
The inner wall of the lower shell 2 corresponding to the movable disc is fixedly provided with a static disc. The static disk comprises an upper static disk 29 and a lower static disk 30 which are mutually attached and connected, the upper static disk 29 and the lower static disk 30 are respectively cylindrical, a static disk flange 31 is arranged on the inner walls of the upper static disk 29 and the lower static disk 30, a static disk ring groove 32 is arranged on the outer circumferences of the upper static disk 29 and the lower static disk 30, a static disk radial hole 33 is arranged on the static disk ring groove 32, and the static disk radial hole 33 is communicated with the static disk ring groove 32.
The movable disc is composed of an upper movable disc 24 and a lower movable disc 25, and the stationary disc is composed of an upper stationary disc 29 and a lower stationary disc 30, so that the movable disc is convenient to process, is convenient to assemble, and can be used for selectively assembling one group or 2 groups or a plurality of groups of combinations of the movable disc and the stationary disc according to actual working conditions in actual working. In the assembly process, the centering bearing 22 is matched with the diversion water cap 6 and the middle shell 3, so that the fixation of the movable disc and the static disc can be assisted, and the movable disc rotates along with the transmission shaft 4.
During operation, under the diversion effect of the water inlet blocking head 9, a part of high-pressure drilling fluid enters the upper shell 1 to impact the screw rotor 7 to rotate, so that the transmission shaft 4 is driven to rotate through the short section A14, the hollow flexible shaft 5, the short section B15 and the diversion water cap 6. The other part of high-pressure drilling fluid enters the central hole of the water inlet baffle head 9 from the communication hole of the water inlet baffle head 9, and then enters the central hole of the diversion water cap 6 through the central holes of the short joint A14, the hollow flexible shaft 5 and the short joint B15.
The high-pressure drilling fluid entering the center hole of the diversion water cap 6 enters the transmission shaft axial hole 20 of the transmission shaft 4 through the radial communication hole 13 and the water cap axial hole 11 on the diversion water cap 6, then enters the annular space between the movable disc flange 26 of the upper movable disc 24 and the fixed disc flange 31 of the upper fixed disc 29 and the annular space between the movable disc flange 26 of the lower movable disc 25 and the fixed disc flange 31 of the lower fixed disc 30 respectively through the transmission shaft radial hole 21, and a sliding sealing surface is formed between the inner circumference of the fixed disc flange 31 and the outer circumference of the movable disc due to the sliding sealing surface formed between the outer circumference of the movable disc flange 26 and the inner circumference of the fixed disc wall, and a sealing cavity is formed between the lower end surface of the movable disc flange 26 and the upper end surface of the fixed disc flange 31. The hydrostatic pressure formed by the high-pressure drilling fluid entering the annulus between the movable disc flange 26 and the static disc flange 31 acts on the lower end surface of the movable disc flange 26, so that the transmission shaft 4 is subjected to upward thrust along the axis, the thrust direction is opposite to the hydraulic load direction of the screw rotor 7, the load born by the thrust bearing 23 can be effectively reduced, the working condition of the thrust bearing 23 is further improved, the abrasion degree of the thrust bearing 23 or the probability of cracking and failure is reduced, the service life of the screw drilling tool in the pit is prolonged, wherein the drilling fluid flowing out (oozing) of the annulus between the movable disc flange 26 and the static disc flange 31 enters the static disc annular groove 32 through the static disc radial hole 33, and the drilling fluid entering the static disc annular groove 32 sequentially acts on the centralizing bearing 22 and the thrust bearing 23 through the annulus of the lower end surface of the static disc flange 31 of the lower static disc 30 due to the communication between the annular groove 32 and the static disc radial hole 33 of the upper static disc 29 and the static disc 30, and also enters the central through the transmission shaft 4 along with the change of the pressure.
The high-pressure drilling fluid which completes impacting the screw rotor 7 flows to the radial hole 12 of the water cap through the short joint A14, the hollow flexible shaft 5, the short joint B15 and the annular space between the diversion water cap 6 and the shell part, part of the high-pressure drilling fluid flowing to the radial hole 12 of the water cap enters the annular space 32 of the static disc through the radial hole 33 of the static disc on the upper static disc 29, the annular space between the static disc 32 of the upper static disc 29 and the static disc 30 is communicated with the radial hole 33 of the static disc through the annular space between the flanges, the drilling fluid entering the annular space 32 of the static disc on the upper static disc 29 finally acts on the centering bearing 22 and the thrust bearing 23 through the annular space of the lower end face of the static disc flange 31 of the lower static disc 30 so as to cool and lubricate the centering bearing, and the other part of the drilling fluid enters the central through hole of the transmission shaft 4 through the side through hole 19. In this process, because a pressure difference exists between the upper end face and the lower end face of the two-stage flange of the movable disc flange 26 of the upper movable disc 24 and the movable disc flange 26 of the lower movable disc 25, the liquid pressure of the lower end face of the movable disc flange 26 is higher than that of the upper end face of the movable disc flange 26, so that the movable disc is subjected to upward liquid acting force, and the acting force direction is opposite to the hydraulic load direction of the screw rotor 7, thereby reducing the axial load of the transmission shaft 4.
The other part flowing to the radial hole 12 of the water cap is discharged through the radial hole 12 of the water cap into the central through hole of the transmission shaft 4 through the high-pressure drilling fluid, so that a drilling fluid circulation channel is formed.
The screw drilling tool can effectively reduce the load borne by the thrust bearing 23, thereby improving the working condition of the thrust bearing 23, reducing the abrasion degree of the thrust bearing 23 or the probability of cracking and failure, and prolonging the working life of the screw drilling tool in the pit. The problems that the mechanical property and the service life of the screw drilling tool are influenced are solved, the thrust bearing group runs in a slurry abrasive medium when the conventional screw drilling tool works underground, and the thrust bearing group is easy to wear and break and lose efficacy under the action of axial heavy load, so that the screw drilling tool has positive popularization significance for improving the service life of the screw drilling tool underground.

Claims (5)

1. The utility model provides a hydraulic bears screw rod drilling tool, it comprises last casing (1), lower casing (2), middle casing (3), transmission shaft (4), hollow flexible axle (5) and reposition of redundant personnel water cap (6), its characterized in that: an upper shell (1) is arranged at one end of the middle shell (3) in a threaded manner, a lower shell (2) is arranged at the other end of the middle shell (3) in a threaded manner, a screw rotor (7) is movably arranged in the upper shell (1), and a rotor bushing (8) is fixedly arranged on the inner wall of the upper shell (1) corresponding to the screw rotor (7); a water diversion cap (6) is arranged in the middle shell (3) below the screw rotor (7), a hollow flexible shaft (5) is arranged between the water diversion cap (6) and the screw rotor (7) through a short joint A (14) and a short joint B (15), a transmission shaft (4) is arranged in the lower shell (2) at one side of the water diversion cap (6) through a locking short joint (18), one end of the transmission shaft (4) extends to the outer end of the lower shell (2), and the other end of the transmission shaft (4) is in threaded connection with the water diversion cap (6); a thrust bearing (23) is arranged on a transmission shaft (4) at the inner side of the locking nipple (18) through a centralizing bearing (22) which is symmetrically arranged; a movable disc is arranged on a transmission shaft (4) between the centralizing bearing (22) and the diversion water cap (6), and a static disc is arranged on the inner wall of the lower shell (2) corresponding to the movable disc;
the transmission shaft (4) is a variable-diameter body, a central through hole is formed in the transmission shaft (4), an internal thread is arranged in the lower port of the transmission shaft (4), a transmission shaft bypass hole (19) is formed in the transmission shaft (4), and the transmission shaft bypass hole (19) is communicated with the central through hole of the transmission shaft (4);
a transmission shaft axial hole (20) is formed in the transmission shaft (4) at one side of the transmission shaft bypass hole (19), transmission shaft radial holes (21) are formed in the transmission shaft (4) corresponding to the transmission shaft axial hole (20) at intervals, and the transmission shaft radial holes (21) are communicated with the transmission shaft axial hole (20);
the water diversion cap (6) is a cylindrical body, a partition plate (10) is arranged in a central hole of the water diversion cap (6), a water cap axial hole (11) is axially formed in a cylindrical wall of the periphery of the partition plate (10), the water cap axial hole (11) is communicated with the central hole above the partition plate (10), a water cap radial hole (12) is formed in the cylindrical wall on one side below the partition plate (10), the water cap radial hole (12) is communicated with the central hole below the partition plate (10), and internal threads are respectively arranged at a port of the water diversion cap (6) above the partition plate (10) and a port of the water diversion cap (6) below the partition plate (10).
2. A fluid carrying screw drilling tool as defined in claim 1, wherein: the screw rotor (7) is provided with a central through hole, and a water inlet blocking head (9) is arranged on the top thread of the screw rotor (7); the water inlet baffle head (9) is provided with a central hole, and the central hole is radially provided with a communication hole.
3. A fluid carrying screw drilling tool as defined in claim 1, wherein: the hollow flexible shaft (5) is connected with the short section A (14) and the short section B (15) through the pin shaft (16), the short section A (14) is in threaded connection with the screw rotor (7), and the short section B (15) is in threaded connection with the water diversion cap (6).
4. A fluid carrying screw drilling tool as defined in claim 1, wherein: the movable disk comprises an upper movable disk (24) and a lower movable disk (25), wherein the upper movable disk (24) and the lower movable disk (25) are respectively cylindrical, movable disk flanges (26) are arranged on the circumferences of the upper movable disk (24) and the lower movable disk (25), annular grooves (27) are formed in the inner walls of the upper movable disk (24) and the lower movable disk (25) on one side of each movable disk flange (26), and movable disk radial holes (28) are formed in the annular grooves (27).
5. A fluid carrying screw drilling tool as defined in claim 1, wherein: the static disc comprises an upper static disc (29) and a lower static disc (30), the upper static disc (29) and the lower static disc (30) are respectively cylindrical, a static disc flange (31) is arranged on the inner walls of the upper static disc (29) and the lower static disc (30), a static disc annular groove (32) is arranged on the outer circumferences of the upper static disc (29) and the lower static disc (30), a static disc radial hole (33) is arranged on the static disc annular groove (32), and the static disc radial hole (33) is communicated with the static disc annular groove (32).
CN201810825883.8A 2018-07-25 2018-07-25 Hydraulic bearing screw drilling tool Active CN108716362B (en)

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CN201810825883.8A CN108716362B (en) 2018-07-25 2018-07-25 Hydraulic bearing screw drilling tool

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Application Number Priority Date Filing Date Title
CN201810825883.8A CN108716362B (en) 2018-07-25 2018-07-25 Hydraulic bearing screw drilling tool

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CN108716362A CN108716362A (en) 2018-10-30
CN108716362B true CN108716362B (en) 2023-06-23

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Publication number Priority date Publication date Assignee Title
CN109723375B (en) * 2019-02-27 2023-08-22 长江大学 Hydraulic suspension turbine section
CN113217267B (en) * 2021-06-08 2022-02-11 中国地质大学（北京） All-metal high-temperature-resistant cycloid type downhole motor

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