CN114075929A - Transmission shaft assembly for screw drill - Google Patents
Transmission shaft assembly for screw drill Download PDFInfo
- Publication number
- CN114075929A CN114075929A CN202010829354.2A CN202010829354A CN114075929A CN 114075929 A CN114075929 A CN 114075929A CN 202010829354 A CN202010829354 A CN 202010829354A CN 114075929 A CN114075929 A CN 114075929A
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- Prior art keywords
- bearing
- central tube
- main shaft
- lubricating medium
- drive spindle
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 61
- 230000001050 lubricating effect Effects 0.000 claims abstract description 48
- 239000012530 fluid Substances 0.000 claims description 41
- 238000007789 sealing Methods 0.000 claims description 18
- 238000011144 upstream manufacturing Methods 0.000 claims description 14
- 230000004323 axial length Effects 0.000 claims description 9
- 239000000314 lubricant Substances 0.000 claims description 8
- 238000005461 lubrication Methods 0.000 claims description 8
- 230000000750 progressive effect Effects 0.000 claims 1
- 238000005553 drilling Methods 0.000 abstract description 22
- 238000005452 bending Methods 0.000 abstract description 6
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 12
- 230000000712 assembly Effects 0.000 description 6
- 238000000429 assembly Methods 0.000 description 6
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 230000001105 regulatory effect Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 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
- 238000003860 storage Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 2
- 230000009977 dual effect 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
- 230000002093 peripheral 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
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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Classifications
-
- 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
-
- 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
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/003—Bearing, sealing, lubricating details
-
- 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
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/006—Mechanical motion converting means, e.g. reduction gearings
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
The invention provides a transmission shaft assembly for a screw drill, which comprises a transmission main shaft system, a bearing system and a lubricating medium compensation system. The lubricating medium compensation system comprises a central pipe 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 pipe and a lubricating medium channel arranged on the transmission main shaft. The surrounding space between the transmission main shaft and the central pipe is used as a space for storing the lubricating medium, and the piston is driven to move by utilizing the difference between the internal pressure and the external pressure of the transmission main shaft, so that the parallel arrangement of the lubricating medium compensation system and the bearing system is realized. Therefore, the lubricating medium is ensured to be supplemented to the bearing system in time, the lubricating effect of the bearing system is improved, the service life of the power transmission system of the screw drill is prolonged, the length of the transmission shaft assembly is effectively shortened, and the directional drilling efficiency of the short-bending screw drill is improved.
Description
Technical Field
The invention relates to equipment in the fields of petroleum and natural gas drilling, mineral exploitation and geological exploration, in particular to a transmission shaft assembly for a screw drill, for example, a transmission shaft assembly for a short-bending screw drill.
Background
The screw drilling tool is one of power drilling tools widely used in the operation processes 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 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 technology of the screw drilling tool is required to be continuously improved, the performance of the screw drilling tool is improved, and the field use requirements are met.
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 in an oil and gas drilling process due to a shorter bend point to bit distance. For example, the slope of a common screw with the outer diameter of 127mm and the bend angle of 1.83 degrees is 10 degrees/30 m at most, and the slope of a short bent screw with the outer diameter of 127mm and the bend angle of 1.83 degrees can reach 12.7 degrees/30 m, so that the composite drilling proportion is improved and the mechanical drilling speed is increased in the inclined borehole drilling process.
Between the bend and the drill bit is the drive shaft assembly of the screw drill, and 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 the like. Wherein, the structure and the size of the bearing are basically determined, and the reduced space is limited. It appears that it is more possible to adjust the size and configuration of the oil containment seal.
In recent years, improvements and optimizations have been made to the oil-retaining seal of screw drills.
For example, patent document CN200810154096.1 entitled "automatic pressure regulating oil seal transmission shaft assembly" discloses that upper and lower sealing devices of a transmission shaft have a pressure regulating function to balance the internal pressure with the external pressure fluid pressure. That is, the self-pressure regulating oil seal is arranged in series with the driveshaft, which increases the length of the driveshaft assembly.
For another example, in the patent document with the invention name of "dual compensated automatic pressure regulating oil seal transmission shaft assembly of screw drill", and application number CN201711390741.5, the dual compensated automatic pressure regulating oil seal realizes the supplement of lubricating oil through the movement of a piston, 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 CN201110226400.0 entitled "a pressure compensation function oil seal screw drill drive shaft assembly" discloses a pressure compensation function oil seal screw drill drive shaft assembly for oil and gas drilling. The pressure compensation function is realized through the movement of the piston, and the adopted compensation system is connected with the bearing group in series, so that the length of the transmission shaft assembly cannot be shortened.
For another example, the patent document CN200810045153.2 entitled "a screw drill drive shaft assembly with high sealing performance" relates to a floating drive shaft assembly based on a sealing device with upper and lower knife edges, and the sealing compensation type has smaller compensation amount and shorter sealing life compared with piston type compensation sealing, cannot provide sufficient lubrication for a bearing set, and is not beneficial to the service life of the screw drill.
The oil storage seals in the prior art listed above are equally distributed at the upper and lower ends of the bearing group, belong to a serial structure, and are not suitable for being used in a short-bending screw drilling tool.
Disclosure of Invention
In view of the above problems in the prior art, the present invention provides a drive shaft assembly for a screw drill, including:
a drive spindle system comprising a drive spindle including an interior cavity defined by an interior wall through which pressurized fluid flows and having an upper end upstream and a lower end downstream in a direction of flow of the pressurized fluid;
a bearing system disposed around an exterior of the drive spindle;
a lubrication compensation system comprising:
a central tube disposed in the lumen of the drive shaft, through whose lumen 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 drive shaft comprises a shaft section corresponding to the axial length of the central tube, the inner diameter of the shaft section being larger than the outer diameter of the central tube, such that the outer wall of the central tube and the inner wall of the shaft section define an encircling space, the first end abutting against the inner wall of the drive shaft, thereby preventing the pressure fluid from flowing directly from the first end into the encircling space;
the piston is arranged in the surrounding space and divides the surrounding space into a lubricating medium space and a pressure transmission space, and a lubricating medium is stored in the lubricating medium space;
a lubrication medium passage opening on the drive spindle and extending from the lubrication medium space to the bearing system,
a pressure transfer aperture opening adjacent the second end and enabling the pressure transfer space to communicate with the pressure fluid.
In such a drive shaft assembly, the lubricating medium compensating system is connected in parallel with the bearing system; specifically, the central pipe is arranged in the inner cavity of the transmission main shaft, the lubricating medium is stored in a surrounding space defined between the transmission main shaft and the central pipe, and the piston is driven to move by utilizing the pressure difference between the inside and the outside of the transmission main shaft, so that the lubricating medium is timely supplemented to the bearing system, the lubricating effect of the bearing system is improved, and the service life of the power transmission system of the screw drill is further prolonged. And the lubricating medium compensation system and the bearing system are arranged in parallel, so that the length of the transmission shaft assembly is effectively shortened under the condition of providing a sufficient space for storing the lubricating medium, and a favorable and efficient solution is provided for shortening the distance from a bending point of the short-bending screw drill to the drill bit.
In some embodiments, at least one lubricant channel is provided on the transmission main shaft.
Preferably, two lubricant 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 center tube abuts.
The central tube is thereby arranged in a simple and stable manner in the interior of the drive spindle.
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 tube into the surrounding space and its lubricant space, and the lubricant in the lubricant space is prevented from leaking into the inner cavity of the drive spindle.
In some embodiments, the sealing structure is a circumferential sealing groove formed in the first end, and an O-ring is disposed in the sealing groove.
Alternatively, a sealing gasket is disposed between the first end and the inner cavity shoulder.
In some embodiments, a support seat is disposed in the inner cavity of the drive spindle, the support seat being supported on the second end of the center tube and defining a central through hole.
Thereby, the pressure fluid in the inner cavity of the transmission main shaft flows out through the pressure transmission hole and the central through hole.
In some embodiments, the transmission main shaft is provided with a clamp spring groove on an inner wall, and a clamp spring for supporting the support seat is arranged in the clamp spring groove.
In some embodiments, the drive spindle system further comprises an upper retaining nut and a lower retaining nut threadably connected to the drive spindle, the upper retaining nut disposed proximate an upper end of the drive spindle.
In some embodiments, the bearing system comprises:
a bearing set, which is tightly attached to the lower fixing nut at the upstream along the flow direction of the pressure fluid;
an upper shaft sleeve including an upper bearing outer sleeve and an upper bearing inner sleeve, the upper bearing inner sleeve being disposed between the bearing group and the upper fixing nut around an outer circumferential 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 group in a flow direction of the pressure fluid;
the lower shaft sleeve is positioned at the downstream of the lower fixing nut along the flow direction of the pressure fluid;
an upper bearing housing disposed radially outside the upper bearing housing;
the lower bearing shell is arranged outside the lower shaft sleeve along the radial direction and can be buckled with the upper bearing shell;
a thrust ring disposed radially outward of the lower retaining nut and between the bearing pack and the lower bearing housing.
Thereby, the bearing system is fixed by the upper and lower fixing nuts.
In some embodiments, a positioning shoulder is formed on the outer circumferential surface of the drive spindle, against which the lower bushing rests.
Preferred features of the invention are described in part below and in part will be apparent from the description.
Drawings
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 schematically illustrates a cross-sectional view of a driveshaft assembly according to an embodiment of this invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in detail below with reference to the following detailed description and accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
FIG. 1 schematically illustrates a cross-sectional view of a driveshaft assembly according to an embodiment of this invention. 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 which has an inner space defined by an inner wall in the axial direction, through which a pressure fluid flows. In this embodiment, the pressure fluid may be a drilling fluid. The drive spindle 1 has an upper end and a lower end in the direction of flow of the pressure fluid, the pressure fluid flowing from the upper end to the lower end, the upper end being connected to the cardan shaft system via a pin and the lower end being connected to the drill bit via a 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 portion, and the upper fixing nut 2 and the lower fixing nut 8 are respectively fastened on the outer peripheral surface of the transmission main shaft 1 by threaded connection.
The bearing system comprises a bearing set 6, a thrust collar 7, an upper shaft sleeve, a lower shaft sleeve 11, an upper bearing shell 5 and a lower bearing shell 10. In the present embodiment, the bearing set 6 may be a thrust ball bearing. The bearing set 6 comprises an inner ring and an outer ring from inside to outside along the radial direction. The inner ring of the bearing set 6 is arranged around the outer circumference of the drive spindle 1 and holds the nut 8 in the upstream direction of the flow of the pressurized fluid. The outer ring of the bearing set 6 is arranged radially outside the inner ring of the bearing set 6. The upper bearing sleeve comprises an upper bearing outer sleeve 3 and an upper bearing inner sleeve 4, and the upper bearing outer sleeve 3 is radially arranged on the outer side of the upper bearing inner sleeve 4. The upper bearing housing 5 is arranged radially outside said upper bearing shell, in the present embodiment outside the upper bearing shell 3, and the lower bearing housing 10 is arranged radially outside the lower bearing shell 11. The upper bearing shell 5 and the lower bearing shell 10 are partly overlapping in radial direction and can be snapped onto each other.
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 bearing sleeve 11 are arranged around the outer circumferential surface of the transmission main shaft 1 and abut against one another in the flow direction of the pressure fluid from upstream to downstream in this order. For this purpose, the upper bearing shell 3, the outer ring of the bearing set 6, the thrust ring 7 and the lower bearing shell 10 are also arranged in abutment one against the other in the flow direction of the pressure fluid from upstream to downstream. In this embodiment, the thrust ring 7 may be a radial bearing.
In this embodiment, the upper outer bearing sleeve 3 and the upper inner bearing 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 exemplary embodiment, a positioning shoulder is formed on the outer circumferential surface in the vicinity of the lower end of the drive spindle 1, against which the lower bearing bush 11 bears from upstream in the flow direction of the pressure fluid, so that axial positioning of the bearing system is achieved.
A central tube 12 is arranged in the interior of the drive spindle 1, through the lumen of which central tube 12 pressure fluid flows, and which central tube 12 has a first end 12.1 upstream, a second end 12.2 downstream and an axial length defined by the first end 12.1 and the second end 12.2 in the flow direction of the pressure fluid. The drive 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, so that a surrounding space 16 is defined between the outer wall of the central tube 12 and the inner wall of this spindle section of the drive spindle 1. A piston 13 is disposed in the surrounding space 16, the piston 13 dividing the surrounding space 16 into a lubricating medium space 16.1 and a pressure transmission space 16.2, and a lubricating medium is stored in the lubricating medium space 16.1. The first end 12.1 of the central tube 12 rests against the inner wall of the drive spindle 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 inner space of the drive spindle 1 into the lumen of the central tube 12, but cannot flow directly from the first end 12.1 into the surrounding space 16. The central tube 12 is provided with a pressure transfer opening 15 near the second end 12.2, which pressure transfer opening 15 enables the pressure transfer space 16.2 to communicate with pressure fluid, in other words the pressure of the pressure fluid can be applied to the piston 13 via the pressure transfer opening 15 and the pressure transfer space 16.2.
As shown in fig. 1, in the present exemplary embodiment, an inner chamber shoulder 17 is provided on the inner wall of the drive spindle 1, which inner chamber shoulder 17 divides the inner chamber into two inner chamber sections, wherein the diameter of one inner chamber section is smaller than the diameter of the other inner chamber section. In other words, the inner chamber 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 section of the inner space having the larger diameter, i.e. in the section of the main shaft having the larger inner diameter. The diameter of the larger diameter inner bore section, i.e. the inner diameter of the larger inner diameter main shaft 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 main shaft section define a surrounding space 16.
In this embodiment, the first end 12.1 of the central tube 12 abuts the inner cavity shoulder 17. The central tube 12 is formed at a first end 12.1 with a circumferential sealing groove, in which an O-ring seal is arranged. In other embodiments, not shown, a sealing gasket can alternatively be arranged directly between the first end 12.1 and the inner chamber shoulder 17. The second end 12.2 of the central tube 12 is supported on a support seat 14. The bearing seat 14 is also arranged in the spindle section of larger inner diameter in which the central tube 12 is located and is supported by means of a clamping spring 19 in a clamping spring groove 18 formed on the inner wall of the drive spindle 1. A pressure transmission hole 15 is arranged on the second end part 12.2, and a central through hole 14.1 corresponding to the pressure transmission hole 15 is arranged on the supporting seat 14, so that the pressure fluid can flow out from the tube cavity of the central tube 12.
In the surrounding space 16 a piston 13 is arranged. The piston 13 divides the surrounding space 16 into a lubricating medium space 16.1 and a pressure transmission space 16.2, and a lubricating medium is stored in the lubricating medium space 16.1. As mentioned above, at the first end 12.1 of the central tube 12, sealing grooves and O-rings are provided, so that the lubrication medium in the lubrication medium space 16.1 is prevented from leaking to the inner cavity of the drive shaft 1 and the pressure fluid is prevented from flowing directly from the first end 12.1 into the surrounding space 16. In this embodiment, the lubricating medium may be lubricating oil and the lubricating 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 through the pressure transfer openings 15 provided in the second end 12.2 and thus through the pressure transfer space 16.2 and move the piston 13 under pressure.
Furthermore, a lubricating medium channel 9 opens out on the drive spindle 1, which extends from the lubricating medium space 16.1 to the bearing system, so that the lubricating medium is supplied to the bearing system. In some embodiments, at least one lubricant channel is advantageously provided. In the present exemplary embodiment, two lubricant ducts are preferably provided.
The central tube 12, the pressure transmission holes 15 thereof, the piston 13, the support seat 14 and the lubricating medium channel 9 belong to a lubricating medium compensation system of the transmission shaft assembly according to the embodiment of the invention. In other embodiments, which are not shown, the bearing seat can also be fixed in other ways, for example, by being fastened to the inner wall of the drive spindle by a screw connection, instead of the circlip and the circlip groove. In yet 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 spindle, against which the central tube rests directly.
In the operating state of the screw drill, the pressure fluid flows through the drive spindle 1 and through the drill bit connected to the lower end of the drive spindle 1, in the process of which a pressure drop occurs, so that in the direction of flow of the pressure fluid, the pressure in the interior space of the drive spindle 1 upstream of the central tube 12 and in the interior space of the central tube 12 is higher than the pressure outside the drive shaft assembly, i.e. 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 opening 15 opening into the second end 12.2 of the central tube 12 and then via the pressure transfer space 16.2 surrounding the space 16 to the lower side of the piston 13, i.e. to the side of the piston 13 facing the second end 12.2. In the event of consumption of the lubricating medium for the bearing system, the piston 13 is displaced upwards, i.e. towards the first end 12.1, under the effect of the above-mentioned higher internal and chamber pressure, replenishing the lubricating medium from the lubricating medium space 16.1 via the lubricating medium channel 9 into the interior of the bearing system for providing lubrication. In this embodiment, the operating condition may refer to a drilling operation.
As can be seen from the above, the parallel connection of the lubricating medium compensation system and the bearing system is realized by arranging the central tube 12 in the inner cavity of the transmission main shaft 1, controlling the movement of the piston 13 by using the difference between the pressure inside and outside the transmission main shaft 1, and supplying the lubricating medium to the bearing system through the lubricating medium channel 9 opened on the transmission main shaft 1. Through the parallel arrangement, the lubricating medium is ensured to be supplemented to the bearing system in time, the lubricating 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-bending screw drilling tool is improved.
In addition, the manner of assembling the propeller shaft assembly according to the embodiment of the present invention is exemplarily described herein. The lower shaft sleeve 11 and the lower bearing shell 10 are respectively sleeved on the transmission main shaft 1 from inside to outside along the radial direction. And installing a lower fixing nut 8, screwing the lower fixing nut on the transmission main shaft 1, and sleeving the thrust ring 7 on the lower fixing nut 8. Then, the bearing set 6 is sleeved on the transmission main shaft 1, and the upper bearing inner sleeve 4 and the upper bearing outer sleeve 3 are respectively sleeved on the transmission main shaft 1 from inside to outside along the radial direction. Next, the upper bearing housing 5 is fitted to the upper bearing housing 3, and the fixing nut 2 is fitted and screwed to the transmission main shaft 1. At this time, the upper bearing housing 5 and the lower bearing housing 10 are preliminarily fastened, that is, not fastened to each other. Then, the center tube 12 is fitted into the inner cavity of the drive spindle 1, the surrounding space 16 is filled with a lubricating medium, the piston 13 is installed, and after the lubricating medium is supplied to all over the bearing system by the piston 13, the upper bearing housing 5 and the lower bearing housing 10 are fastened to each other. Next, the support base 14 is mounted and fixed by a circlip 19.
As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exhaustive, such that a system, assembly, device, article, or apparatus that comprises a list of elements may include those elements but may include other elements not expressly listed.
Exemplary assemblies, systems, structures and components of the invention have been particularly shown and described with reference to the foregoing embodiments, which are merely illustrative of the best modes of carrying out the assemblies, systems, structures and components. It will be appreciated 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 practicing the assemblies, systems, structures, and components without departing from the spirit and scope of the invention as defined in the appended claims. It is intended that the following claims define the scope of the present assemblies, systems, structures, and components and that the assemblies, systems, structures, and components fall within the scope of these claims and their equivalents. The above description of the present assembly, system, structure, 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. Moreover, the foregoing embodiments are illustrative, and no single feature or element is essential to all possible combinations of features and elements that may be claimed in this or a later application.
List of reference numerals
1 Transmission spindle
2 upper fixing nut
3 Upper bearing outer sleeve
4 upper bearing inner sleeve
5 Upper bearing shell
6 bearing group
7 thrust ring
8 lower fixing nut
9 lubricating medium channel
10 lower bearing shell
11 lower shaft sleeve
12 center tube
12.1 first end portion
12.2 second end
13 piston
14 support seat
14.1 center via
15 pressure transfer hole
16 surrounding space
16.1 lubricating medium space
16.2 pressure transfer space
17 shoulder of inner cavity
18 jump ring groove
19 circlip
Claims (10)
1. A drive shaft assembly for a progressive cavity drill, 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 direction of flow 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 main shaft (1), wherein the pressure fluid flows through the tube cavity of the central tube (12), the central tube (12) having a first end (12.1) upstream and a second end (12.2) downstream in the direction of flow of the pressure fluid and having an axial length defined by the first end (12.1) and the second end (12.2), wherein the drive spindle (1) comprises a spindle section corresponding to the axial length of the central tube (12), the inner diameter of the main shaft section is greater 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 main shaft section define a surrounding space (16), the first end (12.1) is attached to the inner wall of the drive spindle (1), so as to prevent said pressure fluid from flowing directly from the first end (12.1) into said surrounding space (16);
a piston (13) arranged in the surrounding space (16), the piston (13) dividing the surrounding space (16) into a lubricating medium space (16.1) and a pressure transmission space (16.2), and a lubricating medium is stored in the lubricating medium space (16.1);
a lubricating medium channel (9) which opens onto the drive spindle (1) and extends from the lubricating medium space (16.1) to the bearing system,
a pressure transfer orifice (15) opening near the second end (12.2) and enabling the pressure transfer space (16.2) to communicate with the pressure fluid.
2. A drive shaft assembly according to claim 1, characterized in that at least one lubricant channel (9) is provided on the drive spindle (1).
3. A driveshaft assembly according to claim 1, characterised in that an inner cavity shoulder (17) is provided on the inner wall of the driveshaft (1), the first end (12.1) of the central tube (12) abutting against the inner cavity shoulder (17).
4. A driveshaft assembly according to claim 3, characterised in that the central tube (12) is provided with a sealing arrangement at the first end (12.1).
5. A driveshaft assembly according to claim 4, characterised in that the sealing arrangement is a circumferential sealing groove formed in the first end portion (12.1) and in which an O-ring seal is arranged.
6. Transmission shaft assembly according to claim 1, characterised in that a support seat (14) is provided in the inner cavity of the transmission main shaft (1), said support seat (14) being supported on the second end (12.2) of the central tube (12) and being provided with a central through hole (14.1).
7. A driveshaft assembly according to claim 6, characterised in that the drive spindle (1) is provided with a circlip groove (18) on the inner wall, in which circlip groove (18) a circlip (19) is arranged for supporting the support base (14).
8. A driveshaft assembly according to claim 1, characterized in that the driveshaft system further comprises an upper fixing nut (2) and a lower fixing nut (8) threadably connected to the driveshaft (1), the upper fixing nut (2) being arranged near an upper end of the driveshaft (1).
9. The driveshaft assembly of claim 8, wherein the bearing system comprises:
a bearing set (6) which is tightly attached to the lower fixing nut (8) at the upstream in the flow direction of the pressure fluid;
an upper bearing sleeve comprising an upper outer bearing sleeve (3) and an upper inner bearing sleeve (4), the upper inner bearing sleeve (4) being arranged between the bearing group (6) and the upper fixing nut (2) around the outer circumferential surface of the transmission main shaft (1), the upper outer bearing sleeve (3) being arranged radially outside the upper inner bearing sleeve (4) and upstream of the bearing group (6) in the flow direction of the pressure fluid;
a lower bushing (11) located downstream of the lower fixing nut (8) in the direction of flow of the pressure fluid;
an upper bearing housing (5) arranged radially outside the upper bearing shell (3);
a lower bearing housing (10) arranged radially outside the lower bearing sleeve (11) and being capable of being snapped onto the upper bearing housing (5);
a thrust ring (7) disposed radially outward of the lower retaining nut (8) and between the bearing pack (6) and the lower bearing housing (10).
10. A drive shaft assembly according to claim 9, characterized in that a positioning shoulder is formed on the outer circumferential surface of the drive spindle (1), against which positioning shoulder the lower bushing (11) bears.
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 |
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| CN114075929A true CN114075929A (en) | 2022-02-22 |
| CN114075929B CN114075929B (en) | 2023-11-14 |
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Citations (3)
| 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 |
| US20200165872A1 (en) * | 2018-11-27 | 2020-05-28 | Hawg Tools LLC | Downhole motor bearing pack |
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2020
- 2020-08-18 CN CN202010829354.2A patent/CN114075929B/en active Active
Patent Citations (3)
| 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 |
| US20200165872A1 (en) * | 2018-11-27 | 2020-05-28 | Hawg Tools LLC | Downhole motor bearing pack |
Non-Patent Citations (1)
| Title |
|---|
| 王俊涛;谭春飞;王莉萍;李帮军;: "螺杆钻具传动轴失效分析与提高寿命措施探讨", 西部探矿工程, no. 05 * |
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| CN114075929B (en) | 2023-11-14 |
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