Rotary steering tool TC bearing

Abstract

The utility model discloses a rotary steering tool TC bearing which comprises a radial male bearing and a radial female bearing assembly, a thrust bearing rotor is sleeved on the outer side of a large-diameter section of the radial male bearing, and the radial female bearing assembly is rotatably sleeved on the outer side of the radial male bearing; the radial mother bearing assembly comprises a mother bearing cylinder and a mother radial bearing sleeve inserted into the mother bearing cylinder, and a thrust bearing stator is installed at one end of the mother radial bearing sleeve. A plurality of cylindrical hard alloy wear-resistant cushion blocks are welded on the outer ring surface of the radial male bearing and the inner ring surface of the female radial bearing sleeve along annular array plasma, the welding operation temperature can be effectively reduced by adopting a plasma welding technology, and high-temperature damage to a bearing base body is avoided; and a certain overflowing gap is always formed between the radial male bearing and the radial female bearing assembly, so that the rotating friction force is greatly reduced, and the cooling and heat dissipation effects of the contact position are effectively improved.

Description

Technical Field

[0001] This utility model relates to the technical field of oil drilling tool accessories, specifically to TC bearings for rotary guide tools. Background Technology

[0002] The rotary steerable tool's actuator has a non-rotating outer sleeve. The drive shaft passes through the middle of the non-rotating outer sleeve and connects to the drill bit, driving the drill bit to rotate with the drill string. The non-rotating outer sleeve and the drive shaft are connected by two sets of TC bearings. Three circumferentially distributed support ribs on the non-rotating outer sleeve are supported on the well wall with different hydraulic pressures, preventing the non-rotating outer sleeve from rotating with the drill string. Guided drilling is achieved by controlling the magnitude and direction of the offset force of the three support ribs. Currently, most TC bearings commonly used in the market are composed of strip-shaped cemented carbide with an auxiliary wear-resistant layer welded overlay. This has the following drawbacks: 1. High-temperature welding results in low hardness of the bearing matrix, making it prone to deformation and thread sticking. Simultaneously, the wear resistance of the cemented carbide surface decreases after high-temperature treatment, severely affecting the bearing's service life; 2. The drill bit experiences significant force variations, and the bearing is subjected to alternating axial, radial, and torque loads, resulting in complex stress. Significant friction occurs between the moving and stationary rings of the bearing. Conventional TC bearings use a clearance fit between the moving and outer rings, leading to poor heat dissipation and affecting the overall stability of the bearing. Therefore, this case study was developed to address these issues. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model provides a rotary guide tool TC bearing, which solves the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution: a rotary guide tool TC bearing, including a radial male bearing and a radial female bearing assembly, wherein a thrust bearing rotor is sleeved on the outer side of the large diameter section of the radial male bearing, and the radial female bearing assembly is rotatably sleeved on the outer side of the radial male bearing;

[0005] The radial bearing assembly includes a bearing sleeve and a radial bearing sleeve inserted in the bearing sleeve. A thrust bearing stator is installed at one end of the radial bearing sleeve. An arc-shaped surface is provided at one end of the bearing sleeve. A thrust ring is sleeved on the arc-shaped surface. A parallel key is provided between one end of the thrust ring and the thrust bearing stator. An external thread for connecting with a non-rotating outer sleeve is provided on the outer side of the bearing sleeve.

[0006] The outer ring surface of the radial male bearing is provided with an annular groove. The outer wall of the annular groove and the inner ring surface of the female radial bearing sleeve are provided with mounting blind holes evenly arranged along the annular array. Several cylindrical hard alloy wear-resistant pads are plasma welded in the mounting blind holes. The upper end surface of the cylindrical hard alloy wear-resistant pads is higher than the outer ring surface of the radial male bearing and the inner ring surface of the female radial bearing sleeve. The cylindrical hard alloy wear-resistant pads on two adjacent ring surfaces are arranged alternately.

[0007] Several cylindrical PDC composite pads are vacuum brazed along the annular array on the contact surfaces of the thrust bearing rotor and the thrust bearing stator.

[0008] The aforementioned thrust bearing rotor and radial male bearing end face are assembled and fixed by hexagonal head screws.

[0009] A safety device is provided between the aforementioned female bearing sleeve and the female radial bearing bush.

[0010] An internal adjusting ring is provided between the thrust ring and the female radial bearing sleeve.

[0011] The exposed end faces of the aforementioned cylindrical cemented carbide wear-resistant pads and cylindrical PDC composite pads all adopt an arc-shaped chamfer structure.

[0012] An O-ring is provided between the aforementioned mother bearing sleeve and the thrust ring.

[0013] This utility model provides a TC bearing for rotary guide tools. The rotary guide tool TC bearing adopts a matching combination design of radial male bearing and radial female bearing assembly. Several cylindrical hard alloy wear-resistant pads are plasma-welded along an annular array on the outer ring surface of the radial male bearing and the inner ring surface of the female radial bearing sleeve. The plasma welding technology effectively reduces the welding temperature, avoiding high-temperature damage to the bearing substrate. The upper surface of the cylindrical hard alloy wear-resistant pads is higher than the outer ring surface of the radial male bearing and the inner ring surface of the female radial bearing sleeve, and the cylindrical hard alloy wear-resistant pads on adjacent ring surfaces are staggered, ensuring a constant flow gap between the radial male bearing and the radial female bearing assembly. This significantly reduces rotational friction while effectively improving the cooling and heat dissipation effect at the contact point. Several cylindrical PDC composite pads are vacuum-brazed on the contact surface of the thrust bearing rotor and the thrust bearing stator at one end of the female radial bearing sleeve, providing axial rotational support for the radial male bearing shaft and the radial female bearing assembly. This not only effectively reduces axial load but also provides good wear resistance and low processing difficulty. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the front cross-sectional structure of the TC bearing of the rotary guide tool described in this utility model.

[0015] Figure 2 This is a cross-sectional view of the radial bearing assembly described in this utility model.

[0016] Figure 3 This is a cross-sectional view of the radial male bearing described in this utility model.

[0017] Figure 4 This utility model Figure 3 A partial top-view structural diagram.

[0018] In the diagram: 1. Radial male bearing; 2. Radial female bearing assembly; 2-1. Female bearing sleeve; 2-2. Female radial bearing sleeve; 2-3. Safety lock; 3. Internal adjusting ring; 4. Thrust ring; 5. Thrust bearing stator; 6. Thrust bearing rotor; 7. O-ring seal; 8. Annular groove; 9. Hexagonal head screw; 10. Parallel key; 11. Cylindrical carbide wear-resistant pad; 12. Cylindrical PDC composite pad; 13. External thread. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Example: Refer to the appendix of the instruction manual Figure 1-4As can be seen, this application specifically designs a rotary guide tool TC bearing, including a radial male bearing 1 and a radial female bearing assembly 2. A thrust bearing rotor 6 is sleeved on the outer side of the large diameter section of the radial male bearing 1, and the radial female bearing assembly 2 is rotatably sleeved on the outer side of the radial male bearing 1. The radial female bearing assembly 2 includes a female bearing sleeve 2-1 and a female radial bearing sleeve 2-2 inserted into the female bearing sleeve 2-1. A thrust bearing stator 5 is installed at one end of the female radial bearing sleeve 2-2. One end of the female bearing sleeve 2-1 has an arc-shaped surface, and a thrust ring 4 is sleeved on the arc-shaped surface. A parallel key is provided between one end of the thrust ring 4 and the thrust bearing stator 5. 10. The outer side of the female bearing sleeve 2-1 is provided with an external thread 13 for connection with the non-rotating outer sleeve; the outer ring surface of the radial male bearing 1 is provided with an annular groove 8, and the outer wall of the annular groove 8 and the inner ring surface of the female radial bearing sleeve 2-2 are provided with mounting blind holes evenly arranged along an annular array. Several cylindrical hard alloy wear-resistant pads 11 are plasma-welded in the mounting blind holes. The upper end surface of the cylindrical hard alloy wear-resistant pads 11 is higher than the outer ring surface of the radial male bearing 1 and the inner ring surface of the female radial bearing sleeve 2-2. The cylindrical hard alloy wear-resistant pads 11 on two adjacent ring surfaces are arranged alternately; the thrust bearing rotor 6 and the thrust bearing stator 5 Several cylindrical PDC composite pads 12 are vacuum brazed along an annular array on the contact surface. A matching combination design of radial male bearing 1 and radial female bearing assembly 2 is adopted. Several cylindrical hard alloy wear-resistant pads 11 are plasma-welded along an annular array on the outer annular surface of the radial male bearing 1 and the inner annular surface of the female radial bearing sleeve 2-2. The use of plasma welding technology can effectively reduce the welding operation temperature and avoid high-temperature damage to the bearing substrate. The upper end face of the cylindrical hard alloy wear-resistant pad 11 is higher than the outer annular surface of the radial male bearing 1 and the inner annular surface of the female radial bearing sleeve 2-2, and the circular... The staggered arrangement of cylindrical hard alloy wear-resistant pads 11 ensures a constant flow gap between the radial male bearing 1 and the radial female bearing assembly 2, greatly reducing rotational friction and effectively improving the cooling and heat dissipation effect at the contact point. The outer side of the large diameter section of the radial male bearing 1 is fitted with a thrust bearing rotor 6 and a thrust bearing stator 5 at one end of the female radial bearing sleeve 2-2. Several cylindrical PDC composite pads 12 are vacuum brazed on the contact surface, providing axial rotational support for the shaft of the radial male bearing 1 and the radial female bearing assembly 2. This not only effectively reduces axial load but also has good wear resistance and low processing difficulty.

[0021] In the specific implementation process, as a preferred setting, the thrust bearing rotor 6 and the radial male bearing 1 end face are assembled and fixed by hexagonal head screws 9.

[0022] In the specific implementation process, as a preferred setting, a safety device 2-3 is provided between the aforementioned female bearing sleeve 2-1 and female radial bearing sleeve 2-2.

[0023] In the specific implementation process, as a preferred setting, an internal adjusting ring 3 is provided between the thrust ring 4 and the female radial bearing sleeve 2-2.

[0024] In the specific implementation process, as a preferred setting, the exposed end faces of the cylindrical hard alloy wear-resistant pad 11 and the cylindrical PDC composite pad 12 are both equipped with an arc-shaped chamfer structure.

[0025] In the specific implementation process, as a preferred setting, an O-ring gasket 7 is provided between the aforementioned mother bearing sleeve 2-1 and the thrust ring 4.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A rotary steerable tool (TC) bearing, characterized in that, The application relates to a radial male bearing and a radial female bearing assembly, wherein the outer side of the radial male bearing is sleeved with a thrust bearing rotor, and the radial female bearing assembly is rotatably sleeved outside the radial male bearing. The radial female bearing assembly comprises a female bearing cylinder and a female radial bearing sleeve inserted into the female bearing cylinder, one end of the female radial bearing sleeve is provided with a thrust bearing stator, one end of the female bearing cylinder is provided with an arc surface, the arc surface is sleeved with a thrust ring, parallel keys are arranged between one end of the thrust ring and the thrust bearing stator, and an outer thread is formed on the outer side of the female bearing cylinder for connecting with a non-rotating sleeve. An annular groove is formed on the outer ring surface of the radial male bearing, mounting blind holes are evenly formed on the outer wall of the annular groove and the inner ring surface of the female radial bearing sleeve in an annular array, a plurality of cylindrical cemented carbide wear pads are plasma welded in the mounting blind holes, the upper end surface of the cylindrical cemented carbide wear pads is higher than the outer ring surface of the radial male bearing and the inner ring surface of the female radial bearing sleeve, and the cylindrical cemented carbide wear pads on adjacent two ring surfaces are staggered. A plurality of cylindrical PDC composite pads are vacuum brazed on the contact surfaces of the thrust bearing rotor and the thrust bearing stator in an annular array.

2. The rotary steerable tool (TC) bearing of claim 1, wherein, The thrust bearing rotor and the radial male bearing end surface are assembled and fixed through an internal hexagonal cylindrical head screw.

3. The rotary steerable tool (TC) bearing of claim 1, wherein, A safety mechanism is arranged between the female bearing cylinder and the female radial bearing sleeve.

4. The rotary steerable tool (TC) bearing of claim 1, wherein, An internal adjusting ring is arranged between the thrust ring and the female radial bearing sleeve.

5. The rotary steerable tool (TC) bearing of claim 1, wherein, The exposed end surfaces of the cylindrical cemented carbide wear pads and the cylindrical PDC composite pads adopt arc chamfer structures.

6. The rotary steerable tool (TC) bearing of claim 1, wherein, An O-shaped sealing gasket is arranged between the female bearing cylinder and the thrust ring.

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