A rotary blowout preventer locking device

Abstract

The present invention relates to the technical field of drilling and completion pressure control, and in particular to a rotary blowout preventer locking device, which is used to lock a rotary seal assembly in a housing of a rotary blowout preventer, wherein the locking device is arranged on the housing, and the locking device comprises a pressing member and a driving mechanism, wherein the driving mechanism drives the pressing member to extend out of the inner surface of the housing or to retract into the housing. The pressing member is driven by the driving mechanism to extend out of the inner surface of the housing or to retract into the housing, and then the pressing member locks the rotary seal assembly in the housing of the rotary blowout preventer, and the device is relatively simple and reliable.

Description

Technical Field

[0001] The invention relates to the technical field of drilling and completion pressure control, and in particular to a rotary blowout preventer locking device. Background Art

[0002] Refined pressure control technology can effectively prevent and control the occurrence of complex accidents in oil drilling and completion projects, significantly reduce non-productive time, and shorten the drilling cycle. The key equipment of this technology generally includes a rotary blowout preventer, in which the rotary seal assembly needs to be fixed in the housing of the rotary blowout preventer. The existing rotary blowout preventer seal assembly is mostly fixed by hydraulic transmission to compress the rotary seal assembly. The hydraulic transmission equipment is relatively complex and has limited control accuracy. Summary of the invention

[0003] The present invention aims to solve one of the problems in the prior art and provides a rotary blowout preventer locking device.

[0004] The technical solution is as follows:

[0005] A rotary blowout preventer locking device is used to lock a rotary seal assembly in a housing of a rotary blowout preventer. The locking device is arranged on the housing and comprises a pressing member and a driving mechanism. The driving mechanism drives the pressing member to extend out of the inner surface of the housing or retract into the housing.

[0006] The beneficial effect of the technical solution of the present invention is that the pressing member is driven by the driving mechanism to extend out of the inner surface of the shell or retract into the shell, and then the pressing member locks the rotary seal assembly in the shell of the rotary blowout preventer, and the equipment is relatively simple and reliable.

[0007] Based on the above technical solution, the present invention can also be improved as follows.

[0008] Furthermore, the driving mechanism includes an actuator and a transmission mechanism, the transmission mechanism is a gear transmission mechanism, the output shaft of the actuator is transmission-connected to the gear transmission mechanism, and the output end of the gear transmission mechanism is transmission-connected to the pressing member.

[0009] The beneficial effect of adopting the above further scheme is: the extension and retraction of the clamping piece is driven by the gear transmission mechanism, which has the characteristics of large power transmission, long life, stable operation and high reliability, ensuring the reliability of the locking of the rotary seal assembly.

[0010] Based on the above technical solution, the present invention can also be improved as follows.

[0011] Furthermore, the transmission mechanism includes a pinion, a turntable gear and a bevel gear, the output shaft of the actuator is fixedly connected to the pinion, the turntable gear is sleeved on the outside of the housing, the outside of the turntable gear is provided with an external gear transmission connected to the pinion, the top of the turntable gear is provided with a bevel gear transmission connected to several of the bevel gears, and the bevel gear is spirally connected to the clamping piece.

[0012] The beneficial effect of adopting the above further scheme is: by setting up a transmission mechanism of a pinion, a turntable gear, a bevel gear and several bevel gears, the gear transmission from the output shaft of the actuator to the bevel gear is realized, ensuring the reliability of the transmission; at the same time, a gear transmission structure of a plurality of clamping parts driven by the input of an actuator is also realized.

[0013] Based on the above technical solution, the present invention can also be improved as follows.

[0014] Furthermore, a first bearing is fixedly arranged on the housing, an inner ring of the first bearing is fixedly connected to the housing, and an outer ring of the first bearing is the turntable gear.

[0015] The beneficial effect of adopting the above further solution is that the outer ring of the first bearing is used as a turntable gear, and the gear is cleverly arranged on the outer ring, thereby reducing the number of components of the entire transmission device.

[0016] Based on the above technical solution, the present invention can also be improved as follows.

[0017] Furthermore, one end of the clamping piece is provided with an external thread, the bevel gear is provided with an internal thread and is fixedly connected to the housing via a second bearing, and the external thread and the internal thread are screwed together for a helical transmission connection.

[0018] The beneficial effect of adopting the above further scheme is that the clamping piece is driven to move radially in the shell by means of threaded engagement and the second bearing. The clamping piece has the function of axial self-locking, can withstand large axial forces, and has high reliability.

[0019] Based on the above technical solution, the present invention can also be improved as follows.

[0020] Furthermore, the other end of the pressing member passes through the shell and is slidably connected thereto.

[0021] The beneficial effect of adopting the above further solution is that the pressing member and the shell are slidably connected to provide good support and guiding effects.

[0022] Based on the above technical solution, the present invention can also be improved as follows.

[0023] Furthermore, the shell is provided with a non-circular hole, the pressing member is provided with a structure matching the non-circular hole, and the structure is slidably connected to the non-circular hole.

[0024] The beneficial effect of adopting the above further solution is that by providing the guide hole with a non-circular hole structure, the pressing member is prevented from rotating in its circumferential direction.

[0025] Based on the above technical solution, the present invention can also be improved as follows.

[0026] Furthermore, there are multiple pressing members, which are evenly distributed around the circumference of the shell.

[0027] The beneficial effects of adopting the above further solution are: multiple pressing members facilitate providing a greater pressing force, and the evenly distributed structure facilitates pressure balance, thereby improving the reliability of the pressing.

[0028] Based on the above technical solution, the present invention can also be improved as follows.

[0029] Furthermore, it also includes a control device, which is electrically connected to the actuator.

[0030] The beneficial effect of adopting the above further solution is that the actuator is controlled by the control device, thereby realizing the automatic locking and opening of the rotary blowout preventer locking device. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the three-dimensional structure of the rotary blowout preventer assembly of the first embodiment;

[0032] Figure 2 is a cross-sectional view of the housing in the first embodiment;

[0033] Figure 3 is a cross-sectional view of a rotary seal assembly of Embodiment 1;

[0034] Figure 4 is a cross-sectional view of a rotary blowout preventer assembly of Embodiment 1;

[0035] Figure 5 yes Figure 4 The local schematic diagram of the A in the middle;

[0036] Figure 6 yes Figure 4 A partial schematic diagram of point B in the middle.

[0037] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0038] 1. Rotary blowout preventer assembly, 11. Housing, 2. Rotary seal assembly, 12. Control device, 3. Locking device, 31. Actuator, 32. Pinion gear, 33. Turntable gear, 34. Bevel gear, 35. Bevel gear, 36. Pressing member, 37. Second bearing. DETAILED DESCRIPTION

[0039] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0040] The structural diagram of the first embodiment of the rotary blowout preventer locking device of the present invention is shown in FIG. Figures 1 to 6 .

[0041] A rotary blowout preventer locking device is used to lock a rotary seal assembly in a housing of a rotary blowout preventer. The locking device is arranged on the housing and comprises a pressing member and a driving mechanism. The driving mechanism drives the pressing member to extend out of the inner surface of the housing or retract into the housing. The driving mechanism comprises an actuator and a transmission mechanism. The transmission mechanism is a gear transmission mechanism. The output shaft of the actuator is in transmission connection with the gear transmission mechanism. The output end of the gear transmission mechanism is in transmission connection with the pressing member.

[0042] As shown in the figure, the locking device 3 is arranged on the housing 11 . The locking device 3 comprises a pressing member 36 and a driving mechanism, and the driving mechanism is used to drive the pressing member 36 to extend out of the inner surface of the housing 11 or to retract into the housing 11 .

[0043] The driving mechanism includes an actuator 31 and a transmission mechanism, wherein the transmission mechanism includes a pinion 32, a turntable gear 33 and a bevel gear 35. The output shaft of the actuator 31 is fixedly connected to the pinion 32. The turntable gear 33 is sleeved on the outer side of the housing 11. The outer side of the turntable gear 33 is provided with an external gear that is transmission-connected to the pinion 32. The top of the turntable gear 33 is provided with a bevel gear 34 that is transmission-connected to several bevel gears 35. The bevel gear 35 is spirally connected to the clamping piece 36. The output end of the transmission mechanism in this embodiment is the bevel gear 35.

[0044] In this embodiment, a first bearing is fixedly disposed on the housing 11, the inner ring of the first bearing is fixedly connected to the housing 11, and the outer ring of the first bearing is the turntable gear 33. Figure 5 , Figure 6As shown, the inner ring of the bearing is fixedly mounted on the housing 11, and the outer ring of the bearing is a turntable gear 33. In this embodiment, the turntable gear 33 and the bevel gear 34 are two components. When installing, the bevel gear 34 is fixed just above the turntable gear 33 as shown in the figure. In a specific embodiment, the turntable gear 33 and the bevel gear 34 can also be set as an integrated structure of the same component, that is, the bevel gear 34 is directly set above the turntable gear 33. The turntable gear 33 in this embodiment is a full circle of gears set on the outer surface of the outer ring of the bearing to realize the meshing transmission of the pinion 32 and the turntable gear 33.

[0045] like Figure 6 As shown, one end of the clamping member 36 is provided with an external thread, and the bevel gear 35 is provided with an internal thread and fixedly connected to the housing 11 through the second bearing 37, and the external thread and the internal thread are screwed together to form a spiral transmission connection. The other end of the clamping member 36 (the left end in the figure) passes through the housing 11 and is slidably connected thereto. The other end of the clamping member 36 is set as a polygonal structure, and the corresponding housing 11 is also provided with a polygonal through hole for the clamping member 36 to pass through. In the figure, the clamping member 36 is in a clamping state against the rotary seal assembly. In this embodiment, as shown in FIG. Figure 6 As shown, the other end of the pressing member 36 is provided with a conical surface structure, which cooperates with the conical surface structure of the rotary seal assembly to ensure the reliability of locking.

[0046] In this embodiment, the clamping member 36 and its matching second bearing 37 are arranged as 4 evenly distributed structures, so that the clamping force of the clamping member 36 on the rotary seal assembly is balanced, and the reliability of the clamping is improved. In a specific embodiment, according to the actual conditions of well control, the number of the clamping member 36 can be set to be greater to meet the requirements. Figure 2 It is a cross-sectional view including two symmetrical pressing members 36. In another direction, another two pressing members 36 are also symmetrically arranged. Figure 4 3 is a cross-sectional view including an actuator 31 and a pressing member 36. Figure 1 In the figure, two structures for installing clamping parts arranged at 90 degrees are shown on the circumference of the middle part of the rotary blowout prevention assembly 1.

[0047] The working process of the locking device 3 in this embodiment is as follows: before the rotary seal assembly 2 is placed, the pressing piece 36 is located in the housing 11 and will not extend out of the inner surface of the main through hole; the rotary seal assembly 2 is placed into the housing 11 from above the main through hole. When it reaches the set position, the actuator 31 is controlled to drive the pinion 32 connected to the output end of the actuator 31 to rotate, and the pinion 32 is transmitted with the turntable gear 33 to drive the bevel gear 34 to rotate, and the bevel gear 34 drives the four bevel gears 35 to rotate. When the bevel gear 35 rotates, the pressing piece 36 threadedly connected thereto will move relative to it in the horizontal direction shown in the figure. Since the bevel gear 35 is fixed to the housing 11 by the second bearing 37, and the other end of the pressing piece 36 is set to a polygonal structure, the bevel gear 35 will not move in the horizontal direction shown in the figure, so the pressing piece 36 will move toward the center of the housing 11, thereby pressing the rotary seal assembly 2 toward the bottom shown in the figure in the axial direction of the housing 11. When the rotary seal assembly 2 needs to be taken out, the actuator 31 is controlled to retract the pressing member 36 into the housing 11 .

[0048] In this embodiment, the actuator 31 is an electric drive structure, and the control device 12 is electrically connected to the actuator 31. The actuator 31 is controlled by the control device 12, and the extension and contraction of the pressing member 36 is controlled by the driving mechanism to realize the automatic locking and opening of the rotary blowout preventer locking device. At the same time, a manual driving mechanism can also be set to ensure that the normal operation of the system can be realized through the manual mechanism in the event of failure or malfunction of the electric driving structure.

[0049] In this embodiment, the through hole on the housing 11 for the pressing member 36 to pass through and the pressing member 36 can be set to a non-circular shape according to actual usage conditions to prevent the pressing member 36 from rotating.

[0050] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A rotary blowout preventer locking device, used to lock a rotary seal assembly in a housing of a rotary blowout preventer, characterized in that: The locking device is arranged on the housing, and the locking device comprises a pressing member and a driving mechanism, and the driving mechanism drives the pressing member to extend out of the inner surface of the housing or retract into the housing; The driving mechanism comprises an actuator and a transmission mechanism, wherein the transmission mechanism is a gear transmission mechanism, the output shaft of the actuator is in transmission connection with the gear transmission mechanism, and the output end of the gear transmission mechanism is in transmission connection with the pressing member; The transmission mechanism includes a pinion, a turntable gear and a bevel gear, the output shaft of the actuator is fixedly connected to the pinion, the turntable gear is sleeved on the outside of the housing, the outer side of the turntable gear is provided with an external gear connected to the pinion, the top of the turntable gear is provided with a bevel gear connected to several bevel gears, and the bevel gear is connected to the pressing member in a spiral transmission manner; A first bearing is fixedly arranged on the housing, an inner ring of the first bearing is fixedly connected to the housing, and an outer ring of the first bearing is the turntable gear.

2. A rotary blowout preventer locking device according to claim 1, characterized in that: One end of the clamping piece is provided with an external thread, the bevel gear is provided with an internal thread and is fixedly connected to the housing through a second bearing, and the external thread and the internal thread are screwed together for a helical transmission connection.

3. A rotary blowout preventer locking device according to claim 2, characterized in that: The other end of the pressing member passes through the shell and is slidably connected thereto.

4. A rotary blowout preventer locking device according to claim 3, characterized in that: The shell is provided with a non-circular hole, the pressing piece is provided with a structure matching the non-circular hole, and the structure is slidably connected with the non-circular hole.

5. A rotary blowout preventer locking device according to any one of claims 1 to 4, characterized in that: There are multiple pressing members, which are evenly distributed in the circumferential direction of the shell.

6. The rotary blowout preventer locking device according to any one of claims 1 to 4, characterized in that: It also includes a control device, which is electrically connected to the actuator.

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