Slurry circulating device for top drive casing running

Abstract

The utility model discloses a slurry circulating device for top drive casing running, which comprises an outer cylinder, a fixing arm arranged on the outer side of the outer cylinder and used for being fixed with a top drive back-up wrench, a rotating shaft, a rotating shaft and a rotating shaft, the bottom of the screw rod is connected with a leather cup sealing assembly; mud flushing; a lower transparent cover; the driven connector is arranged below the driving connector and matched with the driving connector, the inner wall of the driven connector is provided with threads, the driven connector and the lead screw form a threaded connection pair, and the driving connector is installed at the bottom of the rotating shaft and rotates along with the rotating shaft to drive the driven connector, so that the lead screw moves in the axis direction of the slurry washing pipe. According to the utility model, the top drive transmission is matched with the corresponding structural design, so that the slurry washing pipe, the screw rod and the leather cup sealing assembly are quickly butted with the casing, compared with the traditional technical means, a hydraulic source and a matched hydraulic pipeline are not needed, the device is simple and effective in structure, and the requirements of quickly establishing slurry circulation and grouting during casing running are met.

Description

Technical Field

[0001] This utility model relates to the field of oil drilling technology, specifically to a mud circulation device for top drive casing. Background Technology

[0002] Currently, the main equipment used for top-drive casing running operations in China is the hydraulic rotary casing running device. This device operates by using a hydraulic cylinder to drive slips to clamp the casing. Therefore, a hydraulic station must be installed on-site, and tens of meters of hydraulic pipeline must be fixed to the derrick, resulting in a long installation time. Furthermore, hydraulic drive can only complete the casing clamping action; if mud circulation is required, an additional mud pump and sealing components are needed, leading to low equipment integration and high cost.

[0003] Therefore, a mud circulation device for top drive casing is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a mud circulation device for top drive casing, in order to solve the problem mentioned in the background art that requires the on-site deployment of a hydraulic station and the laying of tens of meters of hydraulic pipeline on the derrick, resulting in low operating efficiency.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a mud circulation device for a top drive lower casing, comprising an outer cylinder, a fixing arm for fixing to the top drive back clamp, and further comprising:

[0006] A rotating shaft is arranged axially along the inner side of the outer cylinder, and its upper end has an opening and is connected to the top drive center tube.

[0007] The lead screw is located inside the rotating shaft and has an inner cavity for mud flow along its length. At least one keyway is provided on the outer side of the lead screw, and a leather cup sealing assembly is connected to the bottom of the lead screw.

[0008] The mud flushing pipe is located inside the inner cavity. The top of the mud flushing pipe extends to the top of the lead screw and is connected to the upper end of the rotating shaft. The peripheral surface of the mud flushing pipe wall and the inner surface of the lead screw form a sealing surface.

[0009] The lower cover is installed at the bottom of the outer cylinder and has an opening that allows the lead screw to pass through. The lower cover has a key-shaped protrusion that mates with the keyway.

[0010] An active coupling and a passive coupling disposed below and cooperating with each other, wherein the inner wall of the passive coupling is threaded and forms a threaded connection pair with the lead screw, the active coupling is installed at the bottom of the rotating shaft and drives the passive coupling to rotate with the rotating shaft, so that the lead screw moves along the axis of the mud flushing pipe.

[0011] Preferably, it also includes at least one bearing placed inside the outer cylinder, the outer cylinder being connected to the rotating shaft via the bearing.

[0012] Preferably, the inside of the leather cup sealing assembly is provided with a channel for mud to flow, and a union component is installed at the upper end of the leather cup sealing assembly. The leather cup sealing assembly is threadedly connected to the lower end of the lead screw through the union component, and the channel is connected to the inner cavity through the union component.

[0013] Preferably, the contact surfaces of the active coupling member and the passive coupling member are respectively provided with a plurality of circumferentially distributed protrusions and grooves, wherein the protrusions and the grooves are adapted to each other.

[0014] Preferably, the orthographic projection of the cross section of the protrusion is an orthographic trapezoid, rectangle, triangle, pointed trapezoid, or oblique trapezoid.

[0015] Preferably, a connector is installed at the bottom of the rotating shaft, through which the rotating shaft drives the active coupling.

[0016] Preferably, a disc spring and an adjusting nut are provided above the active coupling member and sleeved on the outside of the connecting member. The adjusting nut adjusts the pressure of the disc spring on the active coupling member, so that the active coupling member and the passive coupling member are closer or farther apart, thereby changing the driving state of the rotating shaft on the lead screw.

[0017] Preferably, the bottom of the passive coupling is mounted to the lower transparent cover via a limiting ring.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] This invention abandons the traditional method of using a hydraulic cylinder to drive the clamping slips to clamp the casing. Instead, it utilizes a top drive transmission combined with a corresponding structural design to enable the mud flushing pipe, lead screw, and cup sealing assembly to quickly connect with the casing. Compared to traditional techniques, it does not require a hydraulic source or supporting hydraulic lines. The device has a simple and effective structure, fulfilling the need for rapid mud circulation and grouting during casing installation. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of the overall structure of this utility model;

[0021] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0022] Figure 3 This is a schematic diagram of the connection structure between the middle lead screw and the lower through cover of this utility model;

[0023] Figure 4This is an exploded view of the connection structure of the middle connector, active coupling component, and passive coupling component of this utility model;

[0024] Figure 5 This is a schematic diagram of the overall structure of this utility model;

[0025] Figure 6 This is a schematic diagram of the overall structure of this utility model.

[0026] In the picture:

[0027] 1. Rotation; 2. Fixed arm; 3. Bearing; 4. Connector; 5. Outer cylinder; 6. Upper cover; 7. Adjusting nut; 8. Disc spring; 9. Active coupling; 91. Protrusion; 10. Passive coupling; 101. Groove; 11. Lower cover; 111. Key-shaped protrusion; 12. Lead screw; 121. Keyway; 13. Limiting ring; 14. Mud flushing pipe; 15. Union assembly; 16. Leather cup sealing assembly. Detailed Implementation

[0028] 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.

[0029] Please see Figures 1-3 and Figure 5 This utility model provides a technical solution for a mud circulation device for a top drive lower casing: it includes an outer cylinder 5 and a fixing arm 2 for fixing to the top drive back clamp on its outer side, and also includes a rotating shaft 1, which is axially arranged along the inner side of the outer cylinder 5, and has a thread at its upper end opening for connection with the top drive center tube; the rotating shaft 1 of this device is connected to the top drive center tube by a tapered thread, so that the rotation of the top drive can be transmitted to the rotating shaft 1 of the device.

[0030] like Figure 1 As shown, the outer cylinder 5 has two bearings 3 inside, and the outer cylinder 5 is connected to the rotating shaft 1 through the bearings 3. The outer cylinder 5 is fixed to the outside of the rotating shaft 1 by the two bearings 3 and the upper cover 6. The outer cylinder 5 is connected to the back clamp of the top drive through an adjustable fixing arm 2, so that when the rotation of the top drive drives the rotating shaft 1 to rotate, the outer cylinder 5 will not rotate. In this embodiment of the invention, the bearing 2 is a tapered roller bearing, but a tapered roller bearing or a combination of other bearings can be selected.

[0031] The lead screw 12 is located inside the rotating shaft 1 and has an inner cavity for mud flow along its length. The lead screw 12 has at least one keyway 121 on its outer side. The lower cover 11 is installed at the bottom of the outer cylinder 5 and has an opening that allows the lead screw 12 to pass through. The lower cover 11 has a key-shaped protrusion 111 that mates with the keyway. The key-shaped protrusion 111 is embedded in the keyway 121 to limit the position of the lead screw 12. The bottom of the lead screw 12 is connected to a cup seal assembly 16; the mud flushing pipe 14 is located inside the inner cavity, and the top of the mud flushing pipe 14 extends above the lead screw 12 and is connected to the upper end of the rotating shaft 1. There is a moving coupling 9 and a passive coupling 10 located below it and cooperating with it. The inner wall of the passive coupling 10 is threaded and forms a threaded connection pair with the lead screw 12. The moving coupling 9 is installed at the bottom of the rotating shaft 1 and rotates with the rotating shaft 1 to drive the passive coupling 10, so that the lead screw 12 moves along the axial direction of the mud flushing pipe 14. The inside of the cup seal assembly 16 is provided with a channel for mud to flow.

[0032] In this embodiment, the mud flushing pipe 14 is sleeved inside the lead screw 12 and connected to the lead screw 12, which is also sleeved inside the rotating shaft. The mud flushing pipe 14 is connected to the opening at the top of the rotating shaft 1. When the rotating shaft 1 is connected to the center tube of the top drive, the top drive center tube is rotated clockwise. The top drive center tube drives the rotating shaft 1 to rotate, and the rotating shaft 1 drives the active coupling 9 and the passive coupling 10 at its lower end to rotate together. Since the lead screw 12 and the passive coupling 10 form a threaded connection pair, and the lead screw 12 is limited by the key-shaped protrusion 111 on the lower cover 11, when the rotating shaft 1 rotates with the top drive center tube, the lead screw 12 does not rotate but moves downward in a straight line, driving the lowest cup seal assembly 16 into the casing. When the pump is turned on and mud is injected through the mud flushing pipe 14, the mud smoothly enters the casing through the lead screw 12 and the cup seal assembly 16. This allows for rapid mud circulation during the lower casing operation.

[0033] In one embodiment of the present invention, the thread of the lead screw 12 may be a double-ended trapezoidal thread, or it may be designed with other tooth profiles or number of thread starts, such as triangular threads, rectangular threads, single-start or multi-start threads.

[0034] In one embodiment of the present invention, the lead screw 12 is provided with two rectangular keyways 121, or it may be designed as a spline or other shape or number of keyways.

[0035] In one embodiment of the present invention, see [reference] Figure 1 , Figure 5 and Figure 6A union component 15 is installed at the upper end of the cup seal assembly 16. The cup seal assembly 14 is threadedly connected to the lower end of the lead screw 12 via the union component 15, and the channel communicates with the inner cavity through the union component 15. The circumferential surface of the mud flushing pipe 14 and the inner surface of the lead screw 12 form a sealing surface. When the lead screw 12 moves up and down, it moves relative to the mud flushing pipe 14, ensuring that the mud enters the casing body from the mud flushing pipe 14, the lead screw 12, the union component 15, and the cup seal assembly 16. After entering the casing, the cup seal assembly 16 can form a seal with the inner wall of the casing. In this embodiment, the lead screw 12 and the cup seal assembly 16 are connected by the union component 15. Other connection methods can be used, such as pressure-resistant rubber mud pipeline connections, etc.

[0036] In one embodiment of the present invention, see appendix. Figure 1 and Figure 4 The contact surfaces of the active coupling 9 and the passive coupling 10 are respectively provided with a number of circumferentially distributed protrusions 91 and grooves 101, which are adapted to each other. In order to ensure the smooth transmission of torque, protrusions 91 and grooves 101 are provided. The orthographic projection of the cross section of the protrusion 91 is a trapezoid, rectangle, triangle, pointed trapezoid or oblique trapezoid, so that the driving force from the rotating shaft 1 is transmitted to the passive coupling 10.

[0037] In another embodiment of the invention, see Appendix Figure 1 , Figure 2 and Figure 4 A connector 4 is installed at the bottom of the rotating shaft 1, which drives the active coupling 9. The connector 4 can be used to fix the active coupling 9 to the rotating shaft 1 to ensure power transmission.

[0038] In the above embodiment, to avoid transmission overload, this embodiment designs a disc spring 8 and an adjusting nut 7 sleeved on the outside of the connecting member 4 above the active coupling member 9. The adjusting nut 7 adjusts the pressure of the disc spring 8 on the active coupling member 9 by rotating the bolt downwards as a whole, squeezing the disc spring 8, so that the active coupling member 9 and the passive coupling member 10 move closer or further apart, thereby changing the driving state of the rotating shaft 1 on the lead screw 12. The pressure of the disc spring 8 on the active coupling member 9 is adjusted by loosening or tightening the thread. It can be understood that the active coupling member 9 and the passive coupling member 10 form an adaptively separable connection. During the forward transmission of the top drive, when the cup seal assembly 16 is inserted into the sleeve, the union assembly presses on the end face of the sleeve coupling. At this time, the torque will increase, and the torque will overcome the pressure of the disc spring 8 on the active coupling member 9, forming a separation between the active coupling member 9 and the passive coupling member 10, that is, slippage between the active coupling member and the passive coupling member, stopping the threaded transmission and avoiding damage to the lead screw. At the same time, the disc spring 8 acts in both directions, such as Figure 6As shown, when the top drive reverses, if the lead screw 12 moves upward to the end of the inner hole of the rotating shaft 1, similarly to the above, when the torque increases (the limit position of the lead screw 12's upward movement, the state where the lead screw 12 does not disengage from the passive coupling 10), the active coupling 9 and the passive coupling 10 will also slip. In the reverse rotation, the lead screw 11 does not rotate but moves upward in a straight line, causing the lowest cup seal assembly 16 to disengage from the sleeve body and move above the end face of the sleeve coupling.

[0039] In another embodiment of the present invention, depending on actual usage needs, the disc spring 8 can also be selected, or other springs such as wave springs and cylindrical springs can be used. Simultaneously, the spring can be compressed using appropriate methods and structures to adjust the pressure on the active coupling member 9.

[0040] 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 mud circulation device for a top drive casing, comprising an outer cylinder, a fixing arm for fixing to the top drive back clamp, and; A rotating shaft is arranged axially along the inner side of the outer cylinder, and its upper end has an opening and is connected to the top drive center tube. A lead screw is located inside the rotating shaft and has an inner cavity along its length for mud to flow through. At least one keyway is provided on the outer side of the lead screw. A mud flushing pipe is located inside the inner cavity, and the top of the mud flushing pipe extends above the lead screw and is connected to the upper end of the rotating shaft. A lower through cover, installed at the bottom of the outer cylinder, has an opening allowing the lead screw to pass through, and the lower through cover has a key-shaped protrusion that mates with the keyway, characterized in that: Also includes; An active coupling and a passive coupling disposed below and cooperating with each other, wherein the inner wall of the passive coupling is threaded and forms a threaded connection pair with the lead screw, the active coupling is installed at the bottom of the rotating shaft and drives the passive coupling to rotate with the rotating shaft, so that the lead screw moves along the axis of the mud flushing pipe. The peripheral surface of the mud flushing pipe wall and the inner surface of the screw form a sealing surface; The bottom of the lead screw is connected to a leather cup sealing assembly.

2. A mud circulation device for top drive casing according to claim 1, characterized in that: It also includes at least one bearing placed inside the outer cylinder, the outer cylinder being connected to the rotating shaft via the bearing.

3. A mud circulation device for top drive casing according to claim 1, characterized in that: The inside of the leather cup sealing assembly is provided with a channel for mud to flow. A union component is installed at the upper end of the leather cup sealing assembly, and the leather cup sealing assembly is threadedly connected to the lower end of the screw through the union component. The channel is connected to the inner cavity through the union component.

4. A mud circulation device for top drive casing according to claim 1, characterized in that: The contact surfaces of the active coupling and the passive coupling are respectively provided with a plurality of circumferentially distributed protrusions and grooves, wherein the protrusions and the grooves are adapted to each other.

5. A mud circulation device for top drive casing according to claim 4, characterized in that: The orthographic projection of the cross section of the protrusion is an orthographic trapezoid, rectangle, triangle, pointed trapezoid, or oblique trapezoid.

6. A mud circulation device for top drive casing according to any one of claims 1-5, characterized in that: A connector is installed at the bottom of the rotating shaft, and the rotating shaft drives the active coupling through the connector.

7. A mud circulation device for top drive casing according to claim 6, characterized in that: The active coupling is provided with a disc spring and an adjusting nut sleeved on the outside of the connector. The adjusting nut adjusts the pressure of the disc spring on the active coupling, so that the active coupling and the passive coupling slip when the torque exceeds their maximum capacity, thereby changing the driving state of the rotating shaft on the lead screw.

8. A mud circulation device for top drive casing according to claim 7, characterized in that: The bottom of the passive coupling is installed above the lower transparent cover via a limiting ring.

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