CN114075929B - Transmission shaft assembly for screw drilling tool - Google Patents
Transmission shaft assembly for screw drilling tool Download PDFInfo
- Publication number
- CN114075929B CN114075929B CN202010829354.2A CN202010829354A CN114075929B CN 114075929 B CN114075929 B CN 114075929B CN 202010829354 A CN202010829354 A CN 202010829354A CN 114075929 B CN114075929 B CN 114075929B
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- bearing
- central tube
- shaft assembly
- spindle
- lubrication
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 66
- 238000005553 drilling Methods 0.000 title claims abstract description 41
- 238000005461 lubrication Methods 0.000 claims abstract description 54
- 239000012530 fluid Substances 0.000 claims description 41
- 238000007789 sealing Methods 0.000 claims description 17
- 238000012546 transfer Methods 0.000 claims description 17
- 238000011144 upstream manufacturing Methods 0.000 claims description 13
- 230000004323 axial length Effects 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 3
- 230000000284 resting effect Effects 0.000 claims 1
- 230000001050 lubricating effect Effects 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 12
- 230000000712 assembly Effects 0.000 description 7
- 238000000429 assembly Methods 0.000 description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 239000003209 petroleum derivative Substances 0.000 description 3
- 238000004904 shortening Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000020347 spindle assembly Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
-
- 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
-
- 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
- E21B4/006—Mechanical motion converting means, e.g. reduction gearings
Abstract
The application provides a transmission shaft assembly for a screw drilling tool, which comprises a transmission main shaft system, a bearing system and a lubricating medium compensation system. The lubricating medium compensation system comprises a central tube arranged in the inner cavity of the transmission main shaft, a piston arranged between the inner cavity of the transmission main shaft and the central tube, and a lubricating medium channel arranged on the transmission main shaft. The parallel arrangement of the lubrication medium compensation system and the bearing system is realized by using the surrounding space between the transmission main shaft and the central tube as the space for storing the lubrication medium and utilizing the pressure difference between the inside and the outside of the transmission main shaft to drive the piston to move. Therefore, the lubrication medium is timely supplemented to the bearing system, the lubrication effect of the bearing system is improved, the service life of the power transmission system of the screw drilling tool is prolonged, the length of the transmission shaft assembly is effectively shortened, and the directional drilling efficiency of the short-bend screw drilling tool is improved.
Description
Technical Field
The present application relates to equipment in the fields of oil and gas drilling, mineral exploitation and geological exploration, and in particular to a drive shaft assembly for a screw drilling tool, for example a drive shaft assembly for a short bend screw drilling tool.
Background
The screw drilling tool is one of widely used power drilling tools in the operation process of petroleum and natural gas drilling, mineral exploitation and geological exploration, and mainly comprises a bypass valve assembly, a motor assembly, a universal shaft assembly, a transmission shaft assembly and the like. With the continuous development of petroleum and natural gas drilling, mineral development and geological exploration technologies, the requirements on the screw drilling tool are also higher and higher, such as longer service life, higher impact resistance, higher output torque, stronger overload capacity and the like, so that the research and application technologies of the screw drilling tool are required to be continuously advanced to improve the performance of the screw drilling tool and meet the field use requirements.
Among various screw drilling tools, a short bend Screw (SBTB) drilling tool can obtain a higher build rate than a conventional screw under the same weight on bit application during oil and gas drilling due to a shorter bend point to bit distance. For example, a common screw with an outer diameter of 127mm and a bend angle of 1.83 degrees has a maximum slope of 10 degrees/30 m, while a short-bend screw with an outer diameter of 127mm and a bend angle of 1.83 degrees has a slope of 12.7 degrees/30 m, so that the composite drilling proportion and the mechanical drilling rate are improved in the inclined hole drilling process.
Between the bend and the drill bit is a drive shaft assembly of the screw drilling tool, shortening the distance from the bend to the drill bit means shortening the length of the drive shaft assembly. The transmission shaft assembly mainly comprises a transmission shaft, a transmission shaft shell, a radial bearing, a thrust bearing group, an oil storage seal and other parts. Wherein the structure and the size of the bearing are basically determined, and the reduction space is limited. It appears that it is more likely to adjust the size and configuration of the reservoir seal.
In recent years, improvements and optimizations have been made to the oil reservoir seal of screw drilling tools.
For example, it is known from patent literature with the name of "automatic pressure-regulating oil seal propeller shaft assembly" and application number CN200810154096.1 that upper and lower seal devices of the propeller shaft have a pressure regulating function to keep the internal pressure balanced with the external pressure fluid pressure. That is, the automatic pressure regulating oil seal is arranged in series with the drive shaft, which increases the length of the drive shaft assembly.
For another example, in patent literature named "screw drilling tool double-compensation automatic pressure-regulating oil seal transmission shaft assembly" and application number CN201711390741.5, double-compensation automatic pressure-regulating oil seal realizes replenishment of lubricating oil by piston movement, but the structure is also arranged in series with the transmission shaft, and the length of the transmission shaft assembly is also increased.
For another example, patent document with the name of "an oil seal screw drilling tool transmission shaft assembly with a pressure compensation function", and application number CN201110226400.0 discloses an oil seal screw drilling tool transmission shaft assembly with a pressure compensation function for petroleum and natural gas drilling. The pressure compensation function is realized through the movement of the piston, the adopted compensation system is connected with the bearing group in series, and the length of the transmission shaft assembly can not be shortened.
For another example, patent literature with the name of "a screw drilling tool transmission shaft assembly with high sealing performance" and application number CN200810045153.2 relates to a floating transmission shaft assembly based on an upper and lower knife edge sealing device, and this sealing compensation mode has small compensation amount and short sealing life compared with a piston type compensation seal, and cannot provide sufficient lubrication for a bearing group, which is not beneficial to the service life of the screw drilling tool.
The oil storage seals in the prior art are distributed at the upper end and the lower end of the bearing group, belong to a series structure, and are not suitable for being used in a short-bending screw drilling tool.
Disclosure of Invention
In view of the foregoing problems with the prior art, the present application provides a drive shaft assembly for a screw drilling tool, comprising:
a drive spindle system including a drive spindle including an interior cavity defined by an interior wall through which a pressurized fluid flows and having an upper end upstream and a lower end downstream in a flow direction of the pressurized fluid;
a bearing system disposed about an outer face of the drive spindle;
a lubrication compensation system comprising:
a central tube disposed in the inner cavity of the transmission spindle, through which the pressure fluid flows, the central tube having a first end upstream in the flow direction of the pressure fluid, a second end downstream and an axial length defined by the first and second ends, wherein the transmission spindle comprises a spindle section corresponding to the axial length of the central tube, the spindle section having an inner diameter that is greater than an outer diameter of the central tube such that an outer wall of the central tube and an inner wall of the spindle section define a surrounding space, the first end abutting against the inner wall of the transmission spindle such that the pressure fluid is prevented from flowing directly from the first end into the surrounding space;
the piston is arranged in the surrounding space, the surrounding space is divided into a lubricating medium space and a pressure transmission space by the piston, and a lubricating medium is stored in the lubricating medium space;
a lubrication channel which is open on the transmission main shaft and extends from the lubrication space to the bearing system,
a pressure transfer orifice open adjacent the second end and capable of placing the pressure transfer space in fluid communication with the pressure.
In such a drive shaft assembly, the lubrication compensation system is in parallel with the bearing system; specifically, through setting up the center tube in the inner chamber of transmission main shaft, realize the storage of lubrication medium in the surrounding space that is limited by transmission main shaft and center tube to utilize the pressure difference inside and outside the transmission main shaft to drive the piston and remove, thereby ensure in time to supply lubrication medium to bearing system, improve bearing system's lubrication effect, and then extension screw rod drilling tool power transmission system's operating life. Moreover, by arranging the lubrication medium compensation system in parallel with the bearing system, the length of the transmission shaft assembly is effectively shortened under the condition of providing sufficient space for storing the lubrication medium, thereby providing an advantageous and efficient solution for shortening the distance from the bending point of the short-bending screw drilling tool to the drill bit.
In some embodiments, at least one lubrication channel is provided on the drive spindle.
Preferably, two lubrication channels are provided.
In some embodiments, an inner cavity shoulder is provided on the inner wall of the drive spindle, against which the first end of the central tube rests.
The central tube is thereby arranged in a simple and stable manner in the interior space of the drive shaft.
In some embodiments, the center tube is provided with a sealing structure at the first end.
Thereby, the pressure fluid is prevented from flowing directly from the first end of the central shaft into the surrounding space and its lubrication medium space, and the lubrication medium in the lubrication medium space is prevented from leaking into the inner cavity of the transmission main shaft.
In some embodiments, the sealing structure is a circumferential sealing groove configured at the first end, within which sealing groove an O-ring is disposed.
Alternatively, a sealing gasket is arranged between the first end and the cavity shoulder.
In some embodiments, a support seat is provided in the inner cavity of the drive spindle, the support seat being supported on the second end of the central tube and being provided with a central through hole.
Thereby, the pressure fluid in the inner cavity of the transmission main shaft flows out via the pressure transmitting hole and the central through hole.
In some embodiments, the drive spindle is provided with a snap spring groove on the inner wall, in which a snap spring for supporting the support seat is arranged.
In some embodiments, the drive spindle system further comprises an upper and a lower fixation nut threadably connected to the drive spindle, the upper fixation nut being disposed near an upper end of the drive spindle.
In some embodiments, the bearing system comprises:
a bearing set which is closely attached to the lower fixing nut at the upstream along the flow direction of the pressure fluid;
an upper sleeve including an upper bearing outer sleeve and an upper bearing inner sleeve, the upper bearing inner sleeve being disposed between the bearing set and the upper fixing nut around an outer peripheral surface of the transmission main shaft, the upper bearing outer sleeve being disposed radially outside the upper bearing inner sleeve and upstream of the bearing set in a flow direction of a pressure fluid;
a lower sleeve positioned downstream of the lower retaining nut in the direction of flow of the pressurized fluid;
an upper bearing housing radially disposed outside the upper bearing housing;
the lower bearing shell is arranged on the outer side of the lower shaft sleeve in the radial direction and can be mutually buckled with the upper bearing shell;
a thrust ring is disposed radially outward of the lower retaining nut and between the bearing set and the lower bearing housing.
Thereby, the bearing system is fixed with the upper and lower fixing nuts.
In some embodiments, a positioning shoulder is formed on the outer circumferential surface of the transmission main shaft, against which the lower sleeve abuts.
Preferred features of the application are described in part below and in part will be apparent from the description.
Drawings
Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings.
Fig. 1 schematically illustrates a cross-sectional view of a propeller shaft assembly in accordance with an embodiment of the present application.
Detailed Description
The present application will be described in detail with reference to the following detailed description and the accompanying drawings, in order to make the objects, technical solutions and advantages of the present application more apparent. The exemplary embodiments of the present application and the descriptions thereof are used herein to explain the present application, but are not intended to limit the application.
Fig. 1 schematically illustrates a cross-sectional view of a propeller shaft assembly in accordance with an embodiment of the present application. The transmission shaft assembly comprises a transmission main shaft system, a bearing system and a lubricating medium compensation system. The drive spindle system comprises a drive spindle 1 having an inner chamber defined by an inner wall in the axial direction, through which chamber a pressurized fluid flows. In this embodiment, the pressure fluid may be drilling fluid. The transmission main shaft 1 has an upper end and a lower end along the flow direction of the pressure fluid, the pressure fluid flows from the upper end to the lower end, the upper end is connected with the universal shaft system through the pin, and the lower end is connected with the drill bit through the box.
On the outer peripheral surface of the transmission main shaft 1, threads are respectively provided at positions near the upper end and the middle part, and an upper fixing nut 2 and a lower fixing nut 8 are respectively fastened on the outer peripheral surface of the transmission main shaft 1 through threaded connection.
The bearing system comprises a bearing group 6, a thrust ring 7, an upper shaft sleeve, a lower shaft sleeve 11, an upper bearing housing 5 and a lower bearing housing 10. In the present embodiment, the bearing group 6 may be a thrust ball bearing. The bearing set 6 includes an inner ring and an outer ring from inside to outside in the radial direction. The inner ring of the bearing set 6 is arranged around the outer circumference of the drive shaft 1 and is in the flow direction of the pressurized fluid against the downstream fastening nut 8. The outer race of the bearing set 6 is arranged radially outside the inner race of the bearing set 6. The upper shaft sleeve comprises an upper bearing outer sleeve 3 and an upper bearing inner sleeve 4, and the upper bearing outer sleeve 3 is arranged on the outer side of the upper bearing inner sleeve 4 in the radial direction. The upper bearing housing 5 is arranged radially outside said upper sleeve, in this embodiment outside the upper bearing housing 3, and the lower bearing housing 10 is arranged radially outside the lower sleeve 11. The upper bearing housing 5 and the lower bearing housing 10 partially overlap in the radial direction and can be fastened to each other.
Around the outer peripheral surface of the transmission main shaft 1 and in the flow direction of the pressure fluid, an upper fixing nut 2, an upper bearing inner sleeve 4, an inner ring of the bearing set 6, a lower fixing nut 8 and a lower sleeve 11 are arranged in order from upstream to downstream. On this basis, the upper bearing sleeve 3, the outer ring of the bearing set 6, the thrust ring 7 and the lower bearing housing 10 are also arranged in order from upstream to downstream in the flow direction of the pressure fluid. In this embodiment, the thrust ring 7 may be a radial bearing.
In the present embodiment, the upper bearing outer sleeve 3 and the upper bearing inner sleeve 4 have substantially the same or the same axial length.
In this embodiment, the lower fixing nut 8 and the thrust ring 7 have substantially the same or the same axial length.
In the present embodiment, the lower bearing housing 10 and the lower bushing 11 have substantially the same or the same axial length.
In the present embodiment, a positioning shoulder is formed on the outer circumferential surface in the vicinity of the lower end of the transmission main shaft 1, against which the lower sleeve 11 abuts from upstream in the flow direction of the pressure fluid, so that the axial positioning of the bearing system is achieved.
A central tube 12 is arranged in the inner space of the drive shaft 1, through the lumen of which central tube 12 the pressure fluid flows, and which central tube 12 has a first end 12.1 upstream and a second end 12.2 downstream in the flow direction of the pressure fluid and has an axial length defined by the first end 12.1 and the second end 12.2. The transmission spindle 1 comprises a spindle section corresponding to the axial length of the central tube 12, the inner diameter of which is larger than the outer diameter of the central tube 12, such that an encircling space 16 is defined between the outer wall of the central tube 12 and the inner wall of the spindle section of the transmission spindle 1. A piston 13 is arranged in the surrounding space 16, the piston 13 dividing the surrounding space 16 into a lubrication space 16.1 and a pressure transfer space 16.2, the lubrication space 16.1 storing lubrication medium. The first end 12.1 of the central tube 12 rests against the inner wall of the drive shaft 1, and the central tube 12 is provided with a sealing structure at the first end 12.1, so that the pressure fluid can flow from the interior of the drive shaft 1 into the lumen of the central tube 12 and cannot flow directly from the first end 12.1 into the surrounding space 16. The central tube 12 is provided with a pressure transfer hole 15 near the second end 12.2, which pressure transfer hole 15 enables the pressure transfer space 16.2 to be in fluid communication with the pressure, in other words the pressure of the pressure fluid can be applied to the piston 13 via the pressure transfer hole 15 and the pressure transfer space 16.2.
As shown in fig. 1, in the present embodiment, an inner cavity shoulder 17 is provided on the inner wall of the drive shaft 1, the inner cavity shoulder 17 dividing the inner cavity into two inner cavity sections, one of which has a smaller diameter than the other. In other words, the cavity shoulder 17 divides the drive spindle 1 into two spindle sections, wherein the inner diameter of one spindle section is smaller than the inner diameter of the other spindle section. The central tube 12 is arranged in the larger diameter lumen section of the lumen, i.e. in the larger diameter main shaft section. The diameter of the larger diameter inner cavity section, i.e. the inner diameter of the larger inner diameter spindle section, is larger than the outer diameter of the central tube 12, so that the outer wall of the central tube 12 and the inner wall of the larger inner diameter spindle section define an encircling space 16.
In this embodiment, the first end 12.1 of the central tube 12 abuts against the cavity shoulder 17. The central tube 12 is formed at the first end 12.1 with a circumferential sealing groove in which an O-ring is arranged. In other embodiments, not shown, a sealing gasket may alternatively be arranged directly between the first end 12.1 and the cavity shoulder 17. The second end 12.2 of the central tube 12 is supported on a support seat 14. The support 14 is also arranged in the spindle section of the central tube 12 with the larger inner diameter and is supported by means of a snap spring 19 in a snap spring groove 18 formed on the inner wall of the drive spindle 1. The second end 12.2 is provided with a pressure transfer hole 15, and the support seat 14 is provided with a central through hole 14.1 corresponding to the pressure transfer hole 15, so that the pressure fluid can flow out from the lumen of the central tube 12.
A piston 13 is arranged in the surrounding space 16. The piston 13 divides the surrounding space 16 into a lubrication space 16.1 and a transfer space 16.2, in which lubrication space 16.1 lubrication is stored. As described above, a sealing groove and an O-ring are provided in the first end 12.1 of the central tube 12, so that the lubrication medium in the lubrication medium space 16.1 is prevented from leaking into the inner cavity of the transmission spindle 1 and the pressure fluid is prevented from flowing from the first end 12.1 directly into the surrounding space 16. In the present embodiment, the lubrication medium may be a lubricating oil and the lubrication medium space 16.1 may be an oil storage space. The pressure of the pressure fluid flowing through the lumen of the central tube 12 can be applied to the piston 13 via the pressure transfer holes 15 provided in the second end 12.2 and thus via the pressure transfer spaces 16.2 and the piston 13 is caused to move under pressure.
Furthermore, a lubrication channel 9 is provided in the drive shaft 1, which extends from the lubrication space 16.1 to the bearing system described above, so that lubrication is supplied to the bearing system. In some embodiments, at least one lubrication medium channel is advantageously provided. In this embodiment, preferably, two lubrication medium channels are provided.
The above-mentioned central tube 12, its pressure-transmitting hole 15, piston 13, support seat 14 and lubrication medium channel 9 belong to the lubrication medium compensation system of the drive shaft assembly according to an embodiment of the application. In other embodiments, not shown, instead of the snap springs and the snap spring grooves, the support base can also be fastened by other means, for example by screwing on the inner wall of the drive shaft. In still other embodiments, not shown, the support seat may not be provided; in this case, a positioning shoulder can be formed on the inner wall of the drive shaft, against which the central tube directly rests.
In the operating state of the screw drilling tool, the pressure fluid flows through the drive spindle 1 and through the drill bit connected to the lower end of the drive spindle 1, during which a pressure drop is created, so that the pressure in the interior of the drive spindle 1 upstream of the central tube 12 and in the tube cavity of the central tube 12 in the direction of the pressure fluid is higher than the pressure outside the drive spindle assembly, i.e. higher than the pressure outside the upper and lower bearing shells 5, 10. In this case, the pressure of the pressure fluid flowing through the lumen of the central tube 12 acts via the pressure transfer holes 15 which are provided in the second end 12.2 of the central tube 12 and subsequently via the pressure transfer spaces 16.2 which surround the spaces 16 to the underside of the piston 13, i.e. to the side of the piston 13 which faces the second end 12.2. In the event of a consumption of the lubrication medium for the bearing system, the piston 13 moves upwards, i.e. towards the first end 12.1, under the effect of the above-mentioned higher chamber pressure and tube pressure, supplementing the lubrication medium from the lubrication medium space 16.1 into the bearing system via the lubrication medium channel 9 to provide lubrication. In this embodiment, the operating state may refer to a drilling operation.
As can be seen from the above, the parallel connection of the lubrication compensation system and the bearing system is achieved by arranging a central tube 12 in the inner cavity of the transmission shaft 1, controlling the movement of the piston 13 by means of the pressure difference between the inside and outside of the transmission shaft 1, and supplying lubrication to the bearing system through a lubrication channel 9 provided on the transmission shaft 1. Through the parallel connection arrangement, not only is the lubrication medium timely supplemented to the bearing system ensured, the lubrication effect of the bearing system improved, the service life of the screw drilling tool power transmission system prolonged, but also the length of the transmission shaft assembly is effectively shortened, and the directional drilling efficiency of the short-bend screw drilling tool is improved.
In addition, the manner in which a propeller shaft assembly according to an embodiment of the present application is assembled is illustratively described herein. The lower shaft sleeve 11 and the lower bearing housing 10 are respectively sleeved on the transmission main shaft 1 from the inner side to the outer side along the radial direction. The lower fixing nut 8 is installed, the lower fixing nut 8 is screwed on the transmission main shaft 1, and the thrust ring 7 is sleeved on the lower fixing nut 8. Then, the bearing group 6 is sleeved on the transmission main shaft 1, and then the upper bearing inner sleeve 4 and the upper bearing outer sleeve 3 are respectively sleeved on the transmission main shaft 1 from the inner side to the outer side along the radial direction. Next, the upper bearing housing 5 is fitted over the upper bearing sleeve 3, and the upper fixing nut 2 is mounted thereon and screwed onto the transmission main shaft 1. At this time, the upper bearing housing 5 and the lower bearing housing 10 are primarily fastened, that is, not fastened to each other. Then, the central tube 12 is fitted into the inner cavity of the transmission main shaft 1, the surrounding space 16 is filled with a lubricating medium, the piston 13 is installed, and after the lubricating medium is supplied to the bearing system by the piston 13, the upper bearing housing 5 and the lower bearing housing 10 are fastened to each other. Then, the support base 14 is mounted and fixed by a snap spring 19.
In this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a system, assembly, device, article, or apparatus that comprises a list of elements may include those elements but may not include other elements not expressly listed.
Exemplary assemblies, systems, structures, and components of the present application have been particularly shown and described with reference to the foregoing embodiments, which are merely examples of the best modes for carrying out the present assemblies, systems, structures, and components. It will be understood by those skilled in the art that various changes in the embodiments of the assemblies, systems, structures and components described herein may be made in implementing the assemblies, systems, structures and components without departing from the spirit and scope of the application as defined in the appended claims. The appended claims are intended to define the scope of the assemblies, systems, structures and components and so assemblies, systems, structures and components that fall within the claims and their equivalents are covered. The above description of the present assemblies, systems, structures and components should be understood to include all novel and non-obvious combinations of elements described herein, and claims may be presented in this or a later application to any novel and non-obvious combination of elements. Furthermore, the foregoing embodiments are illustrative, and no single feature or element is essential to all possible combinations that may be claimed in this or a later application.
List of reference numerals
1. Transmission main shaft
2. Upper fixing nut
3. Upper bearing jacket
4. Inner sleeve of upper bearing
5. Upper bearing shell
6. Bearing set
7. Thrust ring
8. Lower fixing nut
9. Lubricant medium channel
10. Lower bearing shell
11. Lower shaft sleeve
12. Central tube
12.1 First end portion
12.2 Second end portion
13. Piston
14. Supporting seat
14.1 Center through hole
15. Pressure transmission hole
16. Surrounding space
16.1 Lubrication medium space
16.2 Space-transferring space
17. Inner cavity shoulder
18. Clamp spring groove
19. Clamp spring
Claims (10)
1. A drive shaft assembly for a screw drilling tool, comprising:
a drive spindle system comprising a drive spindle (1), the drive spindle (1) comprising an inner cavity defined by an inner wall through which a pressurized fluid flows and having an upper end upstream and a lower end downstream in a flow direction of the pressurized fluid;
a bearing system arranged around the outside of the drive spindle (1);
a lubrication compensation system comprising:
-a central tube (12) arranged in the inner cavity of the transmission spindle (1), through which central tube (12) the pressure fluid flows, which central tube (12) has a first end (12.1) upstream in the flow direction of the pressure fluid, a second end (12.2) downstream and an axial length defined by the first end (12.1) and the second end (12.2), wherein the transmission spindle (1) comprises a spindle section corresponding to the axial length of the central tube (12), the inner diameter of which spindle section is larger than the outer diameter of the central tube (12), such that the outer wall of the central tube (12) and the inner wall of the spindle section define a surrounding space (16), the first end (12.1) bearing against the inner wall of the transmission spindle (1) such that the pressure fluid is prevented from flowing from the first end (12.1) directly into the surrounding space (16);
a piston (13) disposed in the surrounding space (16), the piston (13) dividing the surrounding space (16) into a lubrication medium space (16.1) and a pressure transmission space (16.2), the lubrication medium space (16.1) storing lubrication medium therein;
a lubrication channel (9) which is arranged on the transmission main shaft (1) and extends from the lubrication space (16.1) to the bearing system,
a pressure transfer hole (15) which is arranged near the second end (12.2) and can lead the pressure transfer space (16.2) to be in fluid communication with the pressure.
2. Drive shaft assembly according to claim 1, characterized in that at least one lubrication medium channel (9) is provided in the drive spindle (1).
3. Drive shaft assembly according to claim 1, characterized in that an inner cavity shoulder (17) is provided on the inner wall of the drive shaft (1), the first end (12.1) of the central tube (12) resting against the inner cavity shoulder (17).
4. A propeller shaft assembly according to claim 3, wherein the central tube (12) is provided with a sealing structure at the first end (12.1).
5. The propeller shaft assembly according to claim 4, characterized in that the sealing structure is a circumferential sealing groove configured in the first end (12.1), in which sealing groove an O-ring is arranged.
6. Drive shaft assembly according to claim 1, characterized in that a support seat (14) is provided in the inner cavity of the drive spindle (1), which support seat (14) is supported on the second end (12.2) of the central tube (12) and is provided with a central through hole (14.1).
7. Drive shaft assembly according to claim 6, characterized in that the drive spindle (1) is provided with a snap spring groove (18) on the inner wall, a snap spring (19) being arranged in the snap spring groove (18) for supporting the support seat (14).
8. Drive shaft assembly according to claim 1, characterized in that the drive spindle system further comprises an upper fixing nut (2) and a lower fixing nut (8) threadably connected to the drive spindle (1), the upper fixing nut (2) being arranged near the upper end of the drive spindle (1).
9. The propeller shaft assembly of claim 8, wherein the bearing system comprises:
a bearing set (6) which is in close contact with the lower fixing nut (8) upstream in the direction of flow of the pressurized fluid;
an upper sleeve comprising an upper bearing outer sleeve (3) and an upper bearing inner sleeve (4), the upper bearing inner sleeve (4) being arranged between the bearing set (6) and the upper fixing nut (2) around the outer circumferential surface of the transmission main shaft (1), the upper bearing outer sleeve (3) being arranged radially outside the upper bearing inner sleeve (4) and upstream of the bearing set (6) in the flow direction of the pressure fluid;
a lower sleeve (11) located downstream of the lower fixing nut (8) in the direction of flow of the pressurized fluid;
an upper bearing housing (5) arranged radially outside the upper bearing housing (3);
a lower bearing housing (10) arranged radially outside the lower sleeve (11) and being capable of being fastened to the upper bearing housing (5);
a thrust ring (7) is arranged radially outside the lower fixing nut (8) and between the bearing set (6) and the lower bearing housing (10).
10. Drive shaft assembly according to claim 9, characterized in that a positioning shoulder is constructed on the outer circumferential surface of the drive spindle (1), against which the lower bushing (11) rests.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010829354.2A CN114075929B (en) | 2020-08-18 | 2020-08-18 | Transmission shaft assembly for screw drilling tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010829354.2A CN114075929B (en) | 2020-08-18 | 2020-08-18 | Transmission shaft assembly for screw drilling tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114075929A CN114075929A (en) | 2022-02-22 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102268962A (en) * | 2011-08-09 | 2011-12-07 | 西南石油大学 | Oil seal screw drilling tool transmission shaft assembly with pressure compensation function |
| CN103615194A (en) * | 2013-12-03 | 2014-03-05 | 东营博深石油机械有限责任公司 | Oil seal spindle assembly of screw drill |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US10900284B2 (en) * | 2018-11-27 | 2021-01-26 | New Ventures Marketing, Llc | Downhole motor bearing pack |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102268962A (en) * | 2011-08-09 | 2011-12-07 | 西南石油大学 | Oil seal screw drilling tool transmission shaft assembly with pressure compensation function |
| CN103615194A (en) * | 2013-12-03 | 2014-03-05 | 东营博深石油机械有限责任公司 | Oil seal spindle assembly of screw drill |
Non-Patent Citations (1)
| Title |
|---|
| 螺杆钻具传动轴失效分析与提高寿命措施探讨;王俊涛;谭春飞;王莉萍;李帮军;;西部探矿工程(第05期);全文 * |
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