CN114439370A - Flexible downhole power drilling tool - Google Patents
Flexible downhole power drilling tool Download PDFInfo
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- CN114439370A CN114439370A CN202210098658.5A CN202210098658A CN114439370A CN 114439370 A CN114439370 A CN 114439370A CN 202210098658 A CN202210098658 A CN 202210098658A CN 114439370 A CN114439370 A CN 114439370A
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- 238000005553 drilling Methods 0.000 title claims abstract description 115
- 239000012530 fluid Substances 0.000 claims description 38
- 230000005540 biological transmission Effects 0.000 claims description 33
- 239000000725 suspension Substances 0.000 claims description 7
- 230000008878 coupling Effects 0.000 description 24
- 238000010168 coupling process Methods 0.000 description 24
- 238000005859 coupling reaction Methods 0.000 description 24
- 238000007789 sealing Methods 0.000 description 13
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
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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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/06—Deflecting the direction of boreholes
- E21B7/061—Deflecting the direction of boreholes the tool shaft advancing relative to a guide, e.g. a curved tube or a whipstock
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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
- E21B12/00—Accessories for drilling tools
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1078—Stabilisers or centralisers for casing, tubing or drill pipes
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
The invention discloses a flexible underground power drilling tool, which relates to the technical field of drilling, and comprises a drilling tool joint, a primary motor structure, at least one serial motor structure and a bearing joint structure which are sequentially hinged, wherein swinging can be realized through a swinging structure between the drilling tool joint and the primary motor structure, between the primary motor structure and the serial motor structure, between adjacent serial motor structures and between the serial motor structure and the bearing joint structure, the drilling tool joint is used for being connected with a drilling tool, and the bearing joint structure is used for being connected with a drilling bit. The flexible downhole power drilling tool has the flexible characteristic, can provide downhole power for ultra-short radius drilling operation, solves the technical problem of ultra-short radius drilling, and improves the drilling efficiency of ultra-short radius drilling.
Description
Technical Field
The invention relates to the technical field of drilling, in particular to a flexible downhole power drilling tool.
Background
The existing underground power drilling tool has longer length and higher rigidity, and can not carry out ultra-short radius drilling operation.
Disclosure of Invention
The invention aims to provide a flexible downhole power drilling tool, which solves the technical problem that the conventional downhole power drilling tool cannot realize ultra-short radius drilling, and achieves the aims of improving the bending capability of the drilling tool and realizing ultra-short radius drilling operation by adopting a mode of connecting a primary motor structure and at least one serial motor structure in series.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a flexible downhole power drilling tool, which comprises a drilling tool joint, a primary motor structure, at least one serial motor structure and a bearing joint structure which are sequentially hinged, wherein swinging can be realized between the drilling tool joint and the primary motor structure, between the primary motor structure and the serial motor structure, between adjacent serial motor structures and between the serial motor structure and the bearing joint structure through a swinging structure, the drilling tool joint is used for being connected with a drilling tool, and the bearing joint structure is used for being connected with a drilling bit.
Preferably, the swing structure between the tool joint and the primary motor structure is a first swing structure, the swing structure between the primary motor structure and the serial motor structure is a second swing structure, the swing structure between adjacent serial motor structures is a third swing structure, and the swing structure between the serial motor structure and the bearing joint structure is a fourth swing structure;
the swing structure comprises a ball head structure and a limiting ball, the inside of the ball head structure is hollow, the ball head structure comprises a ball head and a ball rod, one end of the ball rod is connected with the ball head, a limiting ball groove is formed in the outer wall of the ball head, and the limiting ball is located in the limiting ball groove.
Preferably, the drilling tool joint comprises a drilling tool upper joint and a suspension end, the drilling tool upper joint is provided with a first channel, the first channel is used for flowing of drilling fluid, the upper end of the drilling tool upper joint is provided with a threaded structure used for being connected with a drilling tool, the suspension end is arranged at the lower end of the drilling tool upper joint, the ball head of the first swing structure is located on the inner side of the lower end of the drilling tool upper joint, the inner wall of the drilling tool upper joint is provided with a first groove, and the limiting ball of the first swing structure is located in the first groove and the limiting ball groove.
Preferably, the primary motor structure comprises a primary housing, a primary spindle, a primary motor stator and a primary motor rotor, the primary main shaft is arranged on the inner side of the primary shell, the lower end of the primary main shaft is in transmission connection with the series motor structure, the primary motor stator is arranged on the inner wall of the primary shell, the primary motor rotor is arranged on the outer wall of the primary spindle, the primary motor stator corresponds to the primary motor rotor in position, the primary shell is rotationally connected with the primary spindle, the upper end of the primary shell is connected with the ball rod of the first swing structure, the ball head of the second swing structure is positioned on the inner side of the lower end of the primary shell, the inner wall of the primary shell is provided with a second groove, and the limiting ball of the second swing structure is located in the second groove and the limiting ball groove.
Preferably, the primary housing is rotatably connected with the primary main shaft through a first bearing structure, a first bearing seat is arranged on the inner side of the primary housing, a first passage hole is formed in the first bearing seat, the first passage hole is used for flowing of drilling fluid, and the first bearing structure is located between the primary main shaft and the first bearing seat.
Preferably, the tandem motor structure comprises a tandem housing, a tandem spindle, a tandem motor stator and a tandem motor rotor, wherein the tandem spindle is arranged at the inner side of the tandem housing, the lower end of the tandem spindle is used for being in transmission connection with the adjacent tandem motor structure or the bearing joint structure, the tandem motor stator is arranged on the inner wall of the tandem housing, the tandem motor rotor is arranged on the outer wall of the tandem spindle, the positions of the tandem motor stator and the tandem motor rotor correspond, and the tandem housing and the tandem spindle are in rotation connection;
the upper end of the series main shaft is in transmission connection with the primary motor structure through a first universal shaft, the first universal shaft is located on the inner side of the second swing structure, and a gap exists between the outer wall of the first universal shaft and the inner wall of the second swing structure and is used for flowing of drilling fluid;
and the adjacent serial main shafts are in transmission connection through a second universal shaft, the second universal shaft is positioned on the inner side of the third swinging structure, and a gap exists between the outer wall of the second universal shaft and the inner wall of the third swinging structure and is used for the flowing of drilling fluid.
Preferably, the tandem housing and the tandem main shaft are rotatably connected through a second bearing structure, a second bearing seat is arranged on the inner side of the tandem housing, the second bearing seat is provided with a second passage hole, the second passage hole is used for flowing of drilling fluid, and the second bearing structure is located between the tandem main shaft and the second bearing seat.
Preferably, the bearing joint structure comprises a bearing joint housing and a bearing joint main shaft, the bearing joint main shaft is arranged on the inner side of the bearing joint housing, the bearing joint main shaft is rotatably connected with the bearing joint housing, the lower end of the bearing joint main shaft is used for being connected with a drill bit, the upper end of the bearing joint housing is connected with the ball rod of the fourth swing structure, a cavity is arranged at the lower part of the bearing joint main shaft, a first through hole is formed in the side wall of the bearing joint main shaft corresponding to the upper end of the cavity, and the cavity and the first through hole are used for flowing drilling fluid;
the series motor structure is in transmission connection with the main shaft of the bearing joint through a third universal shaft, the third universal shaft is located on the inner side of the fourth swinging structure, and a gap exists between the outer wall of the third universal shaft and the inner wall of the fourth swinging structure and is used for flowing of drilling fluid.
Preferably, the bearing joint main shaft with the bearing joint shell is connected through the rotation of third bearing structure, the bearing joint main shaft with still be provided with between the bearing joint shell and right the structure, right the structure setting and be in the top of third bearing structure, right the structure including right bearing endotheca and right bearing overcoat, right the bearing endotheca setting and be in the outside of bearing joint main shaft, right the bearing overcoat setting and be in the inner wall of bearing joint shell, right the bearing overcoat and seted up the second through-hole, the second through-hole is used for the flow of drilling fluid.
Compared with the prior art, the invention has the following technical effects:
the flexible downhole power drilling tool can swing a certain angle between the drilling tool joint and the primary motor structure, between the primary motor structure and the serial motor structure, between the adjacent serial motor structures, and between the serial motor structure and the bearing joint structure, so that the whole drilling tool has the flexible characteristic, can provide downhole power for ultra-short radius drilling operation, solves the technical problem of ultra-short radius drilling, and improves the drilling efficiency of ultra-large radius drilling.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is an external schematic view of a flexible downhole motor of the present invention;
FIG. 2 is a schematic view of the interior of the flexible downhole motor of the present invention;
wherein: 100-flexible downhole motor, 1-tool joint, 2-primary motor structure, 3-series motor structure, 4-bearing joint structure, 5-first swing structure, 6-second swing structure, 7-fourth swing structure, 8-limit ball, 9-primary motor upper end, 10-series motor upper end, 11-limit ball groove, 12-tool upper joint, 13-suspension end, 14-first channel, 15-primary housing, 16-primary spindle, 17-primary motor stator, 18-primary motor rotor, 19-series housing, 20-series spindle, 21-series motor stator, 22-series motor rotor, 23-first bearing structure, 24-first bearing seat, 25-a first channel hole, 26-a second bearing structure, 27-a second bearing seat, 28-a second channel hole, 29-a first universal shaft, 30-a third universal shaft, 31-a bearing joint shell, 32-a bearing joint main shaft, 33-a cavity, 34-a first through hole, 35-a third bearing structure, 36-a righting bearing inner sleeve, 37-a righting bearing outer sleeve, 38-a second through hole, 39-a shell adjusting sleeve, 40-a main shaft conical sleeve, 41-a sealing inner sleeve, 42-a sealing outer sleeve, 43-a third through hole, 44-a coupler, 45-a ball seat and 46-a bearing joint end.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of protection of the present invention.
The invention aims to provide a flexible downhole power drilling tool, which solves the technical problem that the conventional downhole power drilling tool cannot realize ultra-short radius drilling, and achieves the aims of improving the bending capability of the drilling tool and realizing ultra-short radius drilling operation by adopting a mode of connecting a primary motor structure and at least one serial motor structure in series.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1-2: this embodiment provides a flexible power drilling tool 100 in pit, including articulated drilling tool joint 1 who connects in proper order, primary motor structure 2, at least one series motor structure 3 and bearing festival structure 4, between drilling tool joint 1 and primary motor structure 2, between primary motor structure 2 and the series motor structure 3, between the adjacent series motor structure 3, all can realize the swing through a swing structure between series motor structure 3 and the bearing festival structure 4, between primary motor structure 2 and the series motor structure 3, between the adjacent series motor structure 3, equal transmission is connected between series motor structure 3 and the bearing festival structure 4, drilling tool joint 1 is used for being connected with the drilling tool, bearing festival structure 4 is used for being connected with the drill bit.
Specifically, in this embodiment, the swing structure between the tool joint 1 and the primary motor structure 2 is a first swing structure 5, the swing structure between the primary motor structure 2 and the series motor structure 3 is a second swing structure 6, the swing structure between adjacent series motor structures 3 is a third swing structure, and the swing structure between the series motor structure 3 and the bearing joint structure 4 is a fourth swing structure 7;
swing structure includes bulb structure and spacing ball 8, and the inside cavity of bulb structure sets up, and the bulb structure includes bulb and club, and the one end and the bulb of club are connected, and spacing ball groove 11 has been seted up to the outer wall of bulb, and spacing ball 8 is arranged in spacing ball groove 11.
In the embodiment, the drill tool joint 1 comprises a drill tool upper joint 12 and a suspension end 13, the drill tool upper joint 12 is provided with a first channel 14, the first channel 14 is used for flowing drilling fluid, the upper end of the drill tool upper joint 12 is provided with an API threaded structure used for connecting with a drill rod or other drilling tools, the suspension end 13 is arranged at the lower end of the drill tool upper joint 12, the ball head of the first swing structure 5 is positioned at the inner side of the lower end of the drill tool upper joint 12, the inner wall of the lower end of the drill tool upper joint 12 is arc-shaped, the lower end of the drill tool upper joint 12 and the first swing structure 5 form a ball joint, the inner wall of the drill tool upper joint 12 is provided with a first groove, the limiting ball 8 of the first swing structure 5 is positioned in the first groove and the limiting ball groove 11, the limiting ball 8 is used for limiting, the ball head of the first swing structure 5 can swing at a certain angle at the lower end of the drill tool upper joint 12, but the ball head of the first swing structure 5 and the drill tool upper joint 12 cannot rotate relatively, thereby achieving the function of transmitting torque.
In the embodiment, the primary motor structure 2 comprises a primary housing 15, a primary spindle 16, a primary motor stator 17 and a primary motor rotor 18, the primary spindle 16 is arranged on the inner side of the primary housing 15, the lower end of the primary spindle 16 is in transmission connection with the series motor structure 3, the primary motor stator 17 is arranged on the inner wall of the primary housing 15, the primary motor rotor 18 is arranged on the outer wall of the primary spindle 16, the positions of the primary motor stator 17 and the primary motor rotor 18 correspond, a gap exists between the primary motor stator 17 and the primary motor rotor 18, the primary motor stator 17 and the primary motor rotor 18 are matched to form a drilling fluid motor, hydraulic energy of the drilling fluid is converted into rotary mechanical energy, the primary motor rotor 18 rotates at a high speed under the driving of the drilling fluid, the primary motor rotor 18 drives the primary spindle 16 to synchronously rotate, the primary housing 15 is in rotary connection with the primary spindle 16, the upper end of the primary shell 15 is provided with a primary motor upper end 9, the primary motor upper end 9 is connected with the primary shell 15 through external threads, and the primary motor upper end 9 is connected with a ball rod of the first swing structure 5 through internal threads.
In this embodiment, the primary housing 15 and the primary spindle 16 are rotationally connected through two first bearing structures 23, the two first bearing structures 23 are respectively located above and below the primary motor rotor 18, two first bearing seats 24 are arranged on the inner side of the primary housing 15, the two first bearing seats 24 are respectively located above and below the primary motor stator 17, the two first bearing seats 24 are both provided with first passage holes 25, the first passage holes 25 are used for flowing of drilling fluid, and the first bearing structures 23 are located between the primary spindle 16 and the first bearing seats 24 and play a role in centering and supporting;
in this embodiment, the bulb of second swing structure 6 is located the inboard of first shell 15 lower extreme, the inboard of first shell 15 lower extreme is provided with ball seat 45, ball seat 45 and first shell 15 key-type connection, the inner wall of ball seat 45 is circular-arcly, ball seat 45 forms the ball pivot with second swing structure 6, first shell 15's ball seat 45 is provided with the second recess, second swing structure 6's spacing ball 8 is located second recess and spacing ball groove 11, spacing ball 8 carries on spacingly, second swing structure 6's bulb can realize the swing of certain angle at first shell 15 lower extreme, but second swing structure 6's bulb and first shell 15 lower extreme can not relative rotation, thereby realize the function of transmission moment of torsion.
In this embodiment, the lower end of the primary spindle 16 is in transmission connection with the upper end of the series spindle 20 through a first universal shaft 29, the first universal shaft 29 includes two couplings 44 and a first transmission shaft, the first universal shaft 29 is used for realizing universal swing and transmitting torque downwards, specifically, the upper end of one coupling 44 is in threaded connection with the lower end of the primary spindle 16, the lower end of one coupling 44 is connected with the upper ball head at the upper end of the first transmission shaft, the upper end of the other coupling 44 is connected with the lower ball head at the lower end of the first transmission shaft, the lower end of the other coupling 44 is in threaded connection with the upper end of the series spindle 20, the couplings 44 and the upper ball head, the couplings 44 and the lower ball head form ball joints, the two couplings 44 and the first transmission shaft can swing with each other, and have universal effect while transmitting torque, and when in operation, synchronous rotation of the primary spindle 16 and the series spindle 20 is realized, the downward transmission of the torque is realized, the first cardan shaft 29 is located at the inner side of the second swing structure 6, and a gap exists between the outer wall of the first cardan shaft 29 and the inner wall of the second swing structure 6, so that the drilling fluid flows.
In this embodiment, the tandem motor structure 3 includes a tandem housing 19, a tandem spindle 20, a tandem motor stator 21 and a tandem motor rotor 22, the tandem spindle 20 is disposed inside the tandem housing 19, the upper end of the tandem spindle 20 is connected to the lower end of the first-stage spindle 16, the lower end of the tandem spindle 20 is used for being in transmission connection with the adjacent tandem motor structure 3 or the bearing joint structure 4, the tandem motor stator 21 is disposed on the inner wall of the tandem housing 19, the tandem motor rotor 22 is disposed on the outer wall of the tandem spindle 20, the positions of the tandem motor stator 21 and the tandem motor rotor 22 correspond, a gap exists between the tandem motor stator 21 and the tandem motor rotor 22, the tandem motor stator 21 and the tandem motor rotor 22 cooperate to form a drilling fluid motor, hydraulic energy of the drilling fluid is converted into rotational mechanical energy, and the tandem motor rotor 22 rotates at a high speed under the driving of the drilling fluid, the series motor rotor 22 drives the series spindle 20 to rotate synchronously, the series shell 19 is connected with the series spindle 20 in a rotating mode, the upper end of the series shell 19 is provided with an upper end 10 of the series motor, the upper end 10 of the series motor is connected with the series shell 19 through external threads, and the upper end 10 of the series motor is connected with a ball rod of the second swing structure 6 or a ball rod of the third swing structure through internal threads.
When the series motor structure 3 is one, the upper end of the series shell 19 is connected with the club of the second swing structure 6, the ball head of the fourth swing structure 7 is positioned on the inner side of the lower end of the series shell 19, the ball seat 45 is arranged on the inner side of the lower end of the series shell 19, the ball seat 45 is in key connection with the series shell 19, the inner wall of the ball seat 45 is arc-shaped, the ball seat 45 and the fourth swing structure 7 form a ball hinge, the ball seat 45 of the series shell 19 is provided with a third groove, the limiting ball 8 of the fourth swing structure 7 is positioned in the third groove and the limiting ball groove 11, the limiting ball 8 is limited, the ball head of the fourth swing structure 7 can swing at a certain angle on the lower end of the series shell 19, but the ball head of the fourth swing structure 7 and the series shell 19 cannot rotate relatively, so that the function of transmitting torque is realized;
when the number of the series motor structures 3 is more than one, the upper end of the uppermost series shell 19 is connected with the club of the second swing structure 6, the ball head of the third swing structure is positioned at the inner side of the lower end of each series shell 19 except the lowermost series shell 19, the inner side of the lower end of the series shell 19 is provided with a ball seat 45, the ball seat 45 is in key connection with the series shell 19, the inner wall of the ball seat 45 is arc-shaped, the ball seat 45 and the third swing structure form a ball hinge, the inner wall of the lower end of each series shell 19 except the lowermost series shell 19 is provided with a fourth groove, a limiting ball 8 of the third swing structure is positioned in the fourth groove and the limiting ball groove 11, and the club of each third swing structure is respectively connected with the upper end of the next adjacent series shell 19; the limiting ball 8 is used for limiting, the ball head of the third swinging structure can swing at a certain angle at the lower end of the serial shell 19, but the ball head of the third swinging structure and the serial shell 19 cannot rotate relatively, so that the function of transmitting torque is realized; the ball head of the fourth swing structure 7 is located on the inner side of the lower end of the lowest serial shell 19, a third groove is formed in the inner wall of the lowest serial shell 19, and the limiting ball 8 of the fourth swing structure 7 is located in the third groove and the limiting ball groove 11.
In this embodiment, the tandem housing 19 and the tandem main shaft 20 are rotationally connected through two second bearing structures 26, the two second bearing structures 26 are respectively located above and below the tandem motor rotor 22, the inner side of the tandem housing 19 is provided with two second bearing seats 27, the two second bearing seats 27 are respectively located above and below the tandem motor stator 21, the second passage holes 28 have been all opened on the two second bearing seats 27, the second passage holes 28 are used for the flow of drilling fluid, the second bearing structures 26 are located between the tandem main shaft 20 and the second bearing seats 27, and the centering support effect is achieved.
In this embodiment, the adjacent tandem spindles 20 are connected by a second universal shaft in a transmission manner, the second universal shaft includes two couplings 44 and a second transmission shaft, the second universal shaft is used for realizing universal swing and transmitting torque downwards, specifically, the upper end of one coupling 44 is in threaded connection with the lower end of the previous tandem spindle 20, the lower end of one coupling 44 is connected with the upper ball head at the upper end of the second transmission shaft, the upper end of the other coupling 44 is connected with the lower ball head at the lower end of the second transmission shaft, the lower end of the other coupling 44 is in threaded connection with the upper end of the next tandem spindle 20, the couplings 44 and the upper ball head, the couplings 44 and the lower ball head form a ball joint, the two couplings 44 and the second transmission shaft can swing with each other, and have universal function while transmitting torque, and during operation, synchronous rotation of the adjacent tandem spindles 20 is realized, and downward transmission of torque is realized, the second cardan shaft is located the inboard of third swing structure, and there is the clearance between the outer wall of second cardan shaft and the inner wall of third swing structure for the flow of drilling fluid.
In this embodiment, the bearing joint structure 4 includes a bearing joint housing 31 and a bearing joint main shaft 32, the upper end of the bearing joint housing 31 is provided with a bearing joint end 46, the bearing joint end 46 is connected with the bearing joint housing 31 through an external thread, the bearing joint end 46 is connected with the ball rod thread of the fourth swing structure 7 through an internal thread, the bearing joint housing 31 is cylindrical in appearance, the bearing joint main shaft 32 is disposed inside the bearing joint housing 31, the bearing joint main shaft 32 is rotatably connected with the bearing joint housing 31, the inner wall or the outer wall of the lower end of the bearing joint main shaft 32 is provided with a standard API thread for connecting with a drill bit, the upper end of the bearing joint housing 31 is connected with the ball rod of the fourth swing structure 7, the lower portion of the bearing joint main shaft 32 is provided with a cavity 33, the side wall of the bearing joint main shaft 32 corresponding to the upper end of the cavity 33 is provided with a first through hole 34, the first through hole 34 is communicated with the cavity 33, and the cavity 33 and the first through hole 34 are used for flowing of drilling fluid.
In this embodiment, the bearing joint main shaft 32 is rotatably connected with the bearing joint outer shell 31 through the third bearing structure 35, the third bearing structure 35 is an open thrust bearing, and is used for bearing the axial drilling pressure of the bearing joint main shaft 32, a drilling fluid can pass through the third bearing structure 35, a centering structure is further arranged between the bearing joint main shaft 32 and the bearing joint outer shell 31, the centering structure is arranged above the third bearing structure 35, the centering structure comprises a centering bearing inner sleeve 36 and a centering bearing outer sleeve 37, the centering bearing inner sleeve 36 is arranged on the outer side of the bearing joint main shaft 32, the centering bearing outer sleeve 37 is arranged on the inner wall of the bearing joint outer shell 31, the centering bearing inner sleeve 36 and the centering bearing outer sleeve 37 interact to form a sliding bearing, so as to play a role of centering the bearing joint main shaft 32, the centering bearing outer sleeve 37 is provided with a second through hole 38, and the second through hole 38 is used for the flow of the drilling fluid.
In this embodiment, the lower end of the third bearing structure 35 is provided with a spindle taper sleeve 40 and a housing adjusting sleeve 39, the spindle taper sleeve 40 is sleeved on the outer side of the bearing joint spindle 32, the housing adjusting sleeve 39 is located on the inner side of the bearing joint housing 31, the housing adjusting sleeve 39 is used for axially limiting the position of the third bearing structure 35, a third through hole 43 is formed in the spindle taper sleeve 40, and the third through hole 43 is communicated with the second through hole 38 and used for circulating drilling fluid.
In this embodiment, a sealing structure is arranged between the bearing joint main shaft 32 and the bearing joint outer shell 31, the sealing structure includes an inner sealing sleeve 41 and an outer sealing sleeve 42, the inner sealing sleeve 41 is sleeved on the outer side of the bearing joint main shaft 32, the inner sealing sleeve 41 is located at the lower end of the main shaft conical sleeve 40, the outer sealing sleeve 42 is located on the inner side of the bearing joint outer shell 31, the outer sealing sleeve 42 is located at the lower end of the outer shell adjusting sleeve 39, a gap between the outer sealing sleeve 42 and the inner sealing sleeve 41 is small, and the gap is used for blocking leakage of drilling fluid and centering the bearing joint main shaft 32.
In this embodiment, the tandem spindle 20 and the bearing-joint spindle 32 are in transmission connection through a third universal shaft 30, the third universal shaft 30 includes two couplings 44 and a third transmission shaft, the third universal shaft 30 is used for realizing universal swing and transmitting torque downwards, specifically, the upper end of one coupling 44 is in threaded connection with the lower end of the tandem spindle 20, the lower end of one coupling 44 is connected with the upper ball head at the upper end of the third transmission shaft, the upper end of the other coupling 44 is connected with the lower ball head at the lower end of the third transmission shaft, the lower end of the other coupling 44 is in threaded connection with the upper end of the bearing-joint spindle 32, the couplings 44 and the upper ball head, and the couplings 44 and the lower ball head form ball joints, the two couplings 44 and the third transmission shaft can swing with each other, and have universal function while transmitting torque, and during operation, synchronous rotation of the tandem spindle 20 and the bearing-joint spindle 32 is realized, the downward transmission of the torque is realized, the third universal shaft 30 is located at the inner side of the fourth swing structure 7, and a gap exists between the outer wall of the third universal shaft 30 and the inner wall of the fourth swing structure 7, and is used for the flow of the drilling fluid.
In the use process, the bearing joint shell 31 is in threaded connection with the bearing joint shell 31 of the power drill motor, the upper coupler 44 is in threaded connection with the output shaft of the power drill motor, and the lower end of the main shaft 32 of the bearing joint is in threaded connection with the drill bit. The bit pressure on the bit is transmitted to the third bearing structure 35 through the bearing joint main shaft 32, the sealing inner sleeve 41 and the main shaft conical sleeve 40 in sequence.
The circulation channels of the drilling fluid are as follows: the drilling fluid flows in from the first passage 14 of the upper tool joint 12 and sequentially passes through the hollow hole of the first oscillating structure 5, the first passage hole 25 of the first bearing structure 23, the gap between the first motor stator 17 and the first motor rotor 18, the first passage hole 25 of the other first bearing structure 23, the hollow hole of the second oscillating structure 6, the second passage hole 28 of the second bearing structure 26, the gap between the series motor stator 21 and the series motor rotor 22, the second passage hole 28 of the other second bearing structure 26, the hollow hole of the third oscillating structure, the second passage hole 28 of the second bearing structure 26, the gap between the series motor stator 21 and the series motor rotor 22, the second passage hole 28 of the other second bearing structure 26, the hollow hole of the fourth oscillating structure 7, the second passage hole 38, the third bearing structure 35, the gap between the housing adjusting sleeve 39 and the main shaft conical sleeve 40, The third through hole 43 and the first through hole 34 flow out to the drill bit from the cavity 33, and then flow back to the tool upper joint 12 from the gap between the flexible downhole power tool 100 and the borehole, so as to realize circulation.
In the use process of the flexible downhole power drilling tool 100 of the embodiment, firstly, the tool joint 1, the primary motor structure 2, the at least one series motor structure 3 and the bearing joint structure 4 are sequentially connected, wherein the series motor structure 3 can be one section or a plurality of sections which are sequentially hinged; secondly, the upper end of the drill tool joint 1 is connected with a drill rod or other drill tools, and the lower end of the bearing joint structure 4 is connected with a drill bit to form a drill column; the drill string is then lowered into the well for drilling operations. The swing structure can enable the drilling tool joint 1, the primary motor structure 2, the at least one series motor structure 3 and the bearing joint structure 4 to swing out a certain angle according to the shape of the borehole, and the swing angles are accumulated in multiple stages, so that the flexible downhole power drilling tool 100 has the flexible characteristic and can penetrate through the borehole with a complex structure to perform drilling operation. The primary motor stator 17 and the primary motor rotor 18 in the primary motor structure 2, and the series motor stator 21 and the series motor rotor 22 in the series motor structure 3 constitute a drilling fluid motor, which can convert hydraulic energy of drilling fluid into rotational mechanical energy to drive the primary spindle 16, each series spindle 20 and the bearing joint spindle 32 to rotate synchronously, so that the flexible downhole power drilling tool 100 of the embodiment has the characteristic of providing downhole power for a drill bit, and the drilling speed of a drilling machine of the drill bit is increased to perform drilling operation.
The first universal shaft 29, the second universal shaft and the third universal shaft 30 may be in various forms such as a ball-shaped universal shaft, a cross-shaped universal shaft, etc., and other forms of universal shafts are still within the scope of the invention of the flexible downhole motor 100 of the present invention.
The drilling fluid motor, also referred to as a mud motor, may be embodied as a screw motor, turbine motor or other hydraulic motor, and variations on the hydraulic motor form remain within the scope of the present invention for the flexible downhole motor 100.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (9)
1. A flexible downhole motor, comprising: including articulated drilling tool joint, first level motor structure, at least one series motor structure and the bearing festival structure of connecting in proper order, the drilling tool joint with between the first level motor structure with between the series motor structure, adjacent between the series motor structure with all can realize the swing through a swing structure between the bearing festival structure, first level motor structure with between the series motor structure, adjacent between the series motor structure with equal transmission is connected between the bearing festival structure, the drilling tool joint is used for being connected with the drilling tool, the bearing festival structure is used for being connected with the drill bit.
2. The flexible downhole motor of claim 1, wherein: the swing structure between the drill tool joint and the primary motor structure is a first swing structure, the swing structure between the primary motor structure and the series motor structure is a second swing structure, the swing structure between adjacent series motor structures is a third swing structure, and the swing structure between the series motor structure and the bearing joint structure is a fourth swing structure;
the swing structure comprises a ball head structure and a limiting ball, the inside of the ball head structure is hollow, the ball head structure comprises a ball head and a ball rod, one end of the ball rod is connected with the ball head, a limiting ball groove is formed in the outer wall of the ball head, and the limiting ball is located in the limiting ball groove.
3. The flexible downhole motor of claim 2, wherein: the drilling tool joint comprises a drilling tool upper joint and a suspension end, the drilling tool upper joint is provided with a first channel, the first channel is used for flowing of drilling fluid, the upper end of the drilling tool upper joint is provided with a threaded structure used for being connected with a drilling tool, the suspension end is arranged at the lower end of the drilling tool upper joint, the ball head of the first swing structure is located on the inner side of the lower end of the drilling tool upper joint, the inner wall of the drilling tool upper joint is provided with a first groove, and the limiting ball of the first swing structure is located in the first groove and the limiting ball groove.
4. The flexible downhole motor of claim 2, wherein: the primary motor structure comprises a primary shell, a primary main shaft, a primary motor stator and a primary motor rotor, the primary main shaft is arranged on the inner side of the primary shell, the lower end of the primary main shaft is in transmission connection with the series motor structure, the primary motor stator is arranged on the inner wall of the primary shell, the primary motor rotor is arranged on the outer wall of the primary spindle, the primary motor stator corresponds to the primary motor rotor in position, the primary shell is rotationally connected with the primary spindle, the upper end of the primary shell is connected with the ball rod of the first swing structure, the ball head of the second swing structure is positioned on the inner side of the lower end of the primary shell, the inner wall of the primary shell is provided with a second groove, and the limiting ball of the second swing structure is located in the second groove and the limiting ball groove.
5. The flexible downhole motor of claim 4, wherein: the primary shell is rotatably connected with the primary main shaft through a first bearing structure, a first bearing seat is arranged on the inner side of the primary shell, a first passage hole is formed in the first bearing seat and used for flowing of drilling fluid, and the first bearing structure is located between the primary main shaft and the first bearing seat.
6. The flexible downhole motor of claim 2, wherein: the series motor structure comprises a series shell, a series spindle, a series motor stator and a series motor rotor, wherein the series spindle is arranged on the inner side of the series shell, the lower end of the series spindle is used for being in transmission connection with the adjacent series motor structure or the bearing joint structure, the series motor stator is arranged on the inner wall of the series shell, the series motor rotor is arranged on the outer wall of the series spindle, the positions of the series motor stator and the series motor rotor correspond to each other, and the series shell is in rotation connection with the series spindle;
the upper end of the series main shaft is in transmission connection with the primary motor structure through a first universal shaft, the first universal shaft is located on the inner side of the second swing structure, and a gap exists between the outer wall of the first universal shaft and the inner wall of the second swing structure and is used for flowing of drilling fluid;
and the adjacent serial main shafts are in transmission connection through a second universal shaft, the second universal shaft is positioned on the inner side of the third swinging structure, and a gap exists between the outer wall of the second universal shaft and the inner wall of the third swinging structure and is used for the flowing of drilling fluid.
7. The flexible downhole motor of claim 6, wherein: the series connection shell and the series connection main shaft are rotatably connected through a second bearing structure, a second bearing seat is arranged on the inner side of the series connection shell, a second passage hole is formed in the second bearing seat and used for flowing of drilling fluid, and the second bearing structure is located between the series connection main shaft and the second bearing seat.
8. The flexible downhole motor of claim 2, wherein: the bearing joint structure comprises a bearing joint shell and a bearing joint main shaft, the bearing joint main shaft is arranged on the inner side of the bearing joint shell, the bearing joint main shaft is rotatably connected with the bearing joint shell, the lower end of the bearing joint main shaft is used for being connected with a drill bit, the upper end of the bearing joint shell is connected with the ball rod of the fourth swing structure, a cavity is arranged at the lower part of the bearing joint main shaft, a first through hole is formed in the side wall, corresponding to the upper end of the cavity, of the bearing joint main shaft, and the cavity and the first through hole are used for flowing of drilling fluid;
the series motor structure is in transmission connection with the main shaft of the bearing joint through a third universal shaft, the third universal shaft is located on the inner side of the fourth swinging structure, and a gap exists between the outer wall of the third universal shaft and the inner wall of the fourth swinging structure and is used for flowing of drilling fluid.
9. The flexible downhole motor of claim 8, wherein: the bearing joint main shaft with the bearing joint shell passes through the third bearing structure and rotates the connection, the bearing joint main shaft with still be provided with between the bearing joint shell and right the structure, it sets up to right the structure the top of third bearing structure, right the structure including right bearing endotheca and right the bearing overcoat, right the bearing endotheca and set up the outside of bearing joint main shaft, right the bearing overcoat and set up the inner wall of bearing joint shell, right the bearing overcoat and seted up the second through-hole, the second through-hole is used for the flow of drilling fluid.
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| CN202210098658.5A CN114439370B (en) | 2022-01-27 | 2022-01-27 | Flexible downhole power drilling tool |
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| CN202210098658.5A CN114439370B (en) | 2022-01-27 | 2022-01-27 | Flexible downhole power drilling tool |
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| CN115030654A (en) * | 2022-06-15 | 2022-09-09 | 大庆市佰昂石油科技有限公司 | Adjustable flexible screw drill |
| CN115898272A (en) * | 2022-11-29 | 2023-04-04 | 北京探矿工程研究所 | Closed loop track control device for flexible power drilling tool |
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| CN114439370B (en) | 2022-09-02 |
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