Hydraulic clamping and locking device of rotary blowout preventer

Abstract

The invention discloses a hydraulic clamping and locking device of a rotary blowout preventer, which relates to the technical field of rotary blowout preventers and comprises a clamp base used for being connected with the bottom of a shell; the hoop retainer is distributed in a circular ring shape and is arranged on the hoop base; the clamping hoops are used for locking the rotating control head, and at least two clamping hoops are arranged on the inner side of the clamping hoop holder in the circumferential direction at equal intervals; and the fixed end of the driving device is arranged on the clamp base, and the telescopic end of the driving device penetrates through the clamp holder to be connected with the clamps so as to drive the clamps to be close to or away from each other. The device can remotely and automatically control opening and closing of the clamp assembly.

Description

Technical Field

[0001] The present invention relates to the technical field of rotating blowout preventers, and more specifically, to a hydraulic locking device for a rotating blowout preventer. Background Art

[0002] In the related art, a rotating blowout preventer is a key device for controlled pressure drilling. As an important part of the rotating blowout preventer, the clamp assembly plays a role in locking the rotating control head to seal the wellhead in actual working conditions. At present, the clamp assemblies on the market generally consist of a clamp body, a hydraulic cylinder, a connecting arm, pins, etc. That is, the protection method using safety bolts converts the linear motion of the hydraulic cylinder into the rotational motion of the clamp, requiring a larger stroke of the hydraulic cylinder; or a manual locking device is used to realize the opening and closing operations of the clamp. That is, the opening and closing of the clamp require manual operation, and the rotating control head is locked and sealed by bolts, which is not conducive to the normal operation of the rotating control head.

[0003] In summary, how to provide a device that can remotely and automatically control the opening and closing of the clamp assembly is an urgent problem to be solved by those skilled in the art at present. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a hydraulic locking device for a rotating blowout preventer, which can remotely and automatically control the opening and closing of the clamp assembly.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A hydraulic locking device for a rotating blowout preventer, comprising:

[0007] A clamp base, which is used to connect with the bottom of the housing;

[0008] A clamp holder, which is distributed in a circular ring shape and is arranged on the clamp base;

[0009] A clamp, which is used to lock the rotating control head, and at least two of the clamps are arranged at equal intervals along the circumference on the inner side of the clamp holder;

[0010] A driving device, whose fixed end is arranged on the clamp base, and the telescopic end of the driving device passes through the clamp holder and is connected with the clamp to drive the clamps to approach or move away from each other.

[0011] In one embodiment, a holder cover plate is arranged on the top of the clamp holder to limit the up and down movement of the clamp.

[0012] In one embodiment, the clamp holder is connected to the clamp base and the holder cover plate by bolts.

[0013] In one embodiment, a clamp guide plate is vertically provided on the clamp base to limit the moving direction of the clamp.

[0014] In one embodiment, it further includes a metal spacer ring for connecting with the top of the housing. When the clamp is closed, the metal spacer ring, the clamp, the clamp holder, and the housing form a sealed annular cavity.

[0015] In one embodiment, the driving device includes at least two hydraulic cylinders evenly distributed circumferentially along the clamp holder.

[0016] In one embodiment, a hydraulic cylinder shield is provided outside the hydraulic cylinder. The oil ports of the oil chambers on both sides of the hydraulic cylinder are respectively connected with a pistonless chamber oil port extension pipe and a piston chamber oil port extension pipe;

[0017] The joints of the pistonless chamber oil port extension pipe and the piston chamber oil port extension pipe are both arranged outside the hydraulic cylinder shield.

[0018] In one embodiment, an indicating rod is provided on the outer wall of the clamp. The hydraulic cylinder shield is provided with a countersunk hole, and the other end of the indicating rod passes through the countersunk hole and is connected with a position indicating bolt.

[0019] In one embodiment, the connections between the clamp base and the clamp holder, between the clamp holder and the hydraulic cylinder, and between the clamp holder and the holder cover plate are all sealed connections.

[0020] When using the rotating blowout preventer hydraulic locking device provided by the present invention, the clamp base can be connected with the bottom of the housing, and an annular clamp holder can be installed on the clamp base. A plurality of clamps are arranged at equal intervals circumferentially on the inner side of the clamp holder, and then the driving device is installed on the clamp base, so that the telescopic end of the driving device passes through the clamp holder and is connected with the outer side of the clamp. When a locking operation needs to be performed on the rotating control head, first, the driving device can be controlled to operate to drive the clamps to move away from each other. Then, the rotating control head can be placed into the clamp. After that, the driving device can be controlled to run in the reverse direction to drive the clamps to move closer to each other, thereby clamping the rotating control head.

[0021] Since the clamps and the driving device of this device are correspondingly arranged, the linear motion of each clamp can be driven simultaneously, avoiding the reduction of the clamp opening and closing efficiency due to the conversion between the linear motion of the driving device and the rotational motion of the clamp, facilitating the smooth opening and closing of the clamp, and enabling remote automatic control of the clamp opening and closing to achieve unmanned operation at the wellhead.

[0022] In summary, the rotating blowout preventer hydraulic locking device provided by the present invention can achieve remote automatic control of the opening and closing of the clamp assembly. Description of the Drawings

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0024] Figure 1 It is an exploded view of the hydraulic locking device of the rotating blowout preventer provided by the present invention;

[0025] Figure 2 It is a sectional view of the hydraulic locking device of the rotating blowout preventer;

[0026] Figure 3 It is an internal assembly schematic diagram of the hydraulic locking device of the rotating blowout preventer;

[0027] Figure 4 It is an axonometric view of the hydraulic locking device of the rotating blowout preventer;

[0028] Figure 5 It is an external view schematic diagram of the hydraulic locking device of the rotating blowout preventer including four hydraulic cylinders.

[0029] Figures 1-5 Wherein:

[0030] 1 is a metal spacer ring, 2 is an M12 hexagon head bolt, 3 is a cage cover plate, 4 is a hydraulic cylinder shield, 5 is a clamp cage, 6 is a hydraulic cylinder, 7 is a position indicating bolt, 8 is an indicating rod, 9 is a clamp, 10 is an M20 hexagon socket head cap screw, 11 is an M27 hexagon head bolt, 12 is a plug, 13 is an extended pipe for the oil port of the pistonless chamber, 14 is an extended pipe for the oil port of the piston chamber, 15 is a clamp base, 16 is an M20 hexagon head bolt, 17 is a clamp guide plate. Specific embodiments

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0032] The core of the present invention is to provide a hydraulic locking device for a rotating blowout preventer, which can realize remote automatic control of the opening and closing of the clamp assembly.

[0033] Please refer to Figures 1 to 5 .

[0034] This specific embodiment provides a hydraulic locking device for a rotating blowout preventer, including:

[0035] A clamp base 15 for connecting to the bottom of the housing;

[0036] A clamp holder 5, which is distributed in a circular ring shape and is arranged on the clamp base 15;

[0037] A clamp 9 for locking the rotary control head, and at least two clamps 9 are arranged at equal intervals along the circumference on the inner side of the clamp holder 5;

[0038] A driving device, whose fixed end is arranged on the clamp base 15, and the telescopic end of the driving device passes through the clamp holder 5 and is connected to the clamp 9 to drive the clamps 9 to approach or move away from each other.

[0039] It should be noted that the clamp base 15 can be connected to the bottom of the housing through M20 hexagon socket head cap screws 10. At least two clamps 9 are arranged at equal intervals along the circumference on the inner side of the clamp holder 5, and each clamp 9 is connected to the telescopic end of the driving device. That is, multiple driving devices are distributed at equal intervals along the circumference of the clamp holder 5, so as to avoid reducing the opening and closing efficiency of the clamp 9 due to the conversion between the linear motion of the driving device and the rotational motion of the clamp 9 when the clamp 9 performs the opening and closing motion, which is beneficial to the smooth opening and closing of the clamp 9.

[0040] It should also be noted that an exhaust hole can be provided through the clamp holder 5, and a plug 12 is provided in the exhaust hole. If mud accumulates in the inner cavity of the clamp holder 5 after the device has been used for a period of time, the operator can pull out the plug 12 to discharge the mud through the exhaust hole, and then block the exhaust hole with the plug 12 so that the device can continue to be used normally.

[0041] In the actual application process, the shape, structure, size, type, number, etc. of the clamp base 15, the clamp holder 5, the clamp 9 and the driving device can be determined according to the actual situation and actual needs.

[0042] When using the rotary blowout preventer hydraulic locking device provided by the present invention, the clamp base 15 can be connected to the bottom of the housing, and an annular clamp holder 5 is installed on the clamp base 15. A plurality of clamps 9 are arranged at equal intervals along the circumference on the inner side of the clamp holder 5, and then the driving device is installed on the clamp base 15 so that the telescopic end of the driving device passes through the clamp holder 5 and is connected to the outer side of the clamp 9. When it is necessary to perform a locking operation on the rotary control head, first, the driving device can be controlled to operate to drive the clamps 9 to move away from each other. Then, the rotary control head can be placed into the clamps 9. After that, the driving device can be controlled to run in the reverse direction to drive the clamps 9 to approach each other, thereby clamping the rotary control head.

[0043] Since the clamp 9 of this device is correspondingly arranged with the driving device, it can drive each clamp to perform linear motion simultaneously, avoiding the reduction of the opening and closing efficiency of the clamp 9 due to the conversion between the linear motion of the driving device and the rotational motion of the clamp 9, facilitating the smooth opening and closing of the clamp 9, and enabling remote automatic control of the opening and closing of the clamp 9 to achieve unmanned operation at the wellhead.

[0044] In summary, the rotating blowout preventer hydraulic locking device provided by the present invention can achieve remote automatic control of the opening and closing of the clamp assembly.

[0045] In one embodiment, a retainer cover plate 3 is provided at the top of the clamp retainer 5 to limit the up-and-down movement of the clamp 9. That is to say, a retainer cover plate 3 can be installed on the upper part of the clamp retainer 5, and the retainer cover plate 3 is used to limit the movement of the clamp 9 in the vertical direction.

[0046] In one embodiment, the clamp retainer 5 is connected to the clamp base 15 and the retainer cover plate 3 by bolts. For example, the clamp retainer 5 can be connected to the clamp base 15 and the retainer cover plate 3 by M27 hexagon head bolts 11.

[0047] In one embodiment, a clamp guide plate 17 is vertically provided on the clamp base 15 to limit the moving direction of the clamp 9.

[0048] For example, the clamp base 15 is connected to the housing by M20 socket head cap screws 10. Four holes are provided on the inner side of the clamp base 15, and the retainer cover plate 3 is provided with mounting grooves corresponding to the holes. The holes and the mounting grooves are used to cooperate with the installation of the clamp guide plate 17 to effectively limit the moving direction of the clamp 9 and ensure that the clamp 9 performs reciprocating linear motion along a preset trajectory.

[0049] In one embodiment, it further includes a metal spacer ring 1 for connecting to the top of the housing. When the clamp 9 is closed, the metal spacer ring 1, the clamp 9, the clamp retainer 5, and the housing form a sealed annular cavity to prevent mud from spraying into the annular cavity during the use of the device and affecting the use of other components. Moreover, the limitation of the moving direction of the clamp 9 by the clamp guide plate 17, the limitation of the moving end of the clamp 9 by the metal spacer ring 1, etc., all contribute to a better centering effect when the clamp 9 is closed.

[0050] In one embodiment, the driving device includes at least two hydraulic cylinders 6 evenly distributed circumferentially along the clamp retainer 5. Among them, the number and arrangement of the hydraulic cylinders 6 can be selected according to the actual situation and actual needs. The increase in the number of hydraulic cylinders can enhance the centering of the clamp 9. Assuming the number of hydraulic cylinders 6 is 4, the structure is as Figure 5 shown, and its structure compared with that of two hydraulic cylinders 6 can make the centering of the clamp 9 better.

[0051] In one embodiment, a cylinder guard 4 is provided outside the hydraulic cylinder 6. The oil ports of the oil chambers on both sides of the hydraulic cylinder 6 are respectively connected with a non-piston-chamber oil port extension pipe 13 and a piston-chamber oil port extension pipe 14. The joints of the non-piston-chamber oil port extension pipe 13 and the piston-chamber oil port extension pipe 14 are arranged outside the cylinder guard 4.

[0052] It should be noted that a cylinder guard 4 can be installed outside the hydraulic cylinder 6. The cylinder guard 4 can be fixed on the clamp base 15 and the cage cover plate 3 by M12 hexagon socket head bolts 2. At the same time, the oil ports of the oil chambers on both sides of the hydraulic cylinder 6 are respectively connected with a non-piston-chamber oil port extension pipe 13 and a piston-chamber oil port extension pipe 14 through threads, and their joints are placed outside the cylinder guard 4 for the convenience of connecting the injection oil pipeline. The cylinder guard 4 can effectively prevent the hydraulic cylinder 6 from being eroded by mud.

[0053] In one embodiment, an indicating rod 8 is provided on the outer wall of the clamp 9. The cylinder guard 4 is provided with a countersunk hole, and the other end of the indicating rod 8 passes through the countersunk hole and is connected with a position-indicating bolt 7.

[0054] It should be noted that a groove can be provided on the outer wall of the clamp 9. One end of the indicating rod 8 is installed and fixed in the groove by an M20 hexagon socket head bolt 16, and the other end of the indicating rod 8 passes through the countersunk hole of the cylinder guard 4 and is connected with the position-indicating bolt 7. When the clamp 9 is opened and closed, the indicating rod 8 can be driven to move synchronously, and the operator can observe the position of the position-indicating bolt 7 on the outside to indirectly observe and judge the position of the clamp 9.

[0055] In one embodiment, the connections between the clamp base 15 and the clamp cage 5, between the clamp cage 5 and the hydraulic cylinder 6, and between the clamp cage 5 and the cage cover plate 3 are all sealed connections. For example, the connections between the clamp base 15 and the clamp cage 5, between the clamp cage 5 and the hydraulic cylinder 6, and between the clamp cage 5 and the cage cover plate 3 can all be sealed by O-rings.

[0056] In addition, it should be noted that the orientation or positional relationship indicated by "top and bottom", "inside and outside", etc. in the present invention is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of simplified description and understanding, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0057] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referred to each other. Any combination of all the embodiments provided by the present invention is within the protection scope of this invention and will not be elaborated here.

[0058] The above has introduced in detail the hydraulic locking device of the rotating blowout preventer provided by the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can still be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A hydraulic locking device for a rotating blowout preventer, characterized in that, it includes: a clamp base (15) for connecting to the bottom of the housing; a clamp retainer (5) which is distributed in a circular ring shape and is arranged on the clamp base (15); a clamp (9) for locking the rotating control head, and at least two of the clamps (9) are arranged at equal intervals along the circumference on the inner side of the clamp retainer (5); a driving device, whose fixed end is arranged on the clamp base (15), and the telescopic end of the driving device passes through the clamp retainer (5) and is connected to the clamp (9) to drive the clamps (9) to approach or move away from each other.

2. The hydraulic locking device for a rotating blowout preventer according to claim 1, characterized in that, a retainer cover plate (3) is arranged on the top of the clamp retainer (5) to limit the up and down movement of the clamp (9).

3. The hydraulic locking device for a rotating blowout preventer according to claim 2, characterized in that, the clamp retainer (5) is connected to the clamp base (15) and the retainer cover plate (3) by bolts.

4. The hydraulic locking device for a rotating blowout preventer according to claim 2, characterized in that, a clamp guide plate (17) is vertically arranged on the clamp base (15) to limit the moving direction of the clamp (9).

5. The hydraulic locking device for a rotating blowout preventer according to claim 4, characterized in that, it further includes a metal spacer ring (1) for connecting to the top of the housing. When the clamp (9) is closed, the metal spacer ring (1), the clamp (9), the clamp retainer (5) and the housing form a sealed annular cavity.

6. The hydraulic locking device for a rotating blowout preventer according to any one of claims 1 to 5, characterized in that, the driving device includes at least two hydraulic cylinders (6) evenly distributed along the circumference of the clamp retainer (5).

7. The hydraulic locking device for a rotating blowout preventer according to claim 6, characterized in that, a hydraulic cylinder shield (4) is arranged outside the hydraulic cylinder (6), and the oil ports of the oil chambers on both sides of the hydraulic cylinder (6) are respectively connected with a pistonless chamber oil port extension pipe (13) and a piston chamber oil port extension pipe (14); the joints of the pistonless chamber oil port extension pipe (13) and the piston chamber oil port extension pipe (14) are arranged outside the hydraulic cylinder shield (4).

8. The hydraulic locking device for a rotating blowout preventer according to claim 7, characterized in that, an indicating rod (8) is arranged on the outer wall of the clamp (9), the hydraulic cylinder shield (4) is provided with a countersunk hole, and the other end of the indicating rod (8) passes through the countersunk hole and is connected to a position indicating bolt (7).

9. The hydraulic locking device for a rotating blowout preventer according to claim 6, characterized in that, the connections between the clamp base (15) and the clamp retainer (5), between the clamp retainer (5) and the hydraulic cylinder (6), and between the clamp retainer (5) and the retainer cover plate (3) are all sealed connections.

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