Casing head with locking mechanism

Abstract

The utility model discloses a casing head with locking mechanisms, which relates to the field of casing heads, and adopts the technical scheme that the casing head comprises a casing head main body and a casing, the bottom of the casing head main body is provided with a connecting part A connected with the casing, the two sides of the casing head main body are both provided with the locking mechanisms, and the locking mechanisms are connected with the casing. The locking mechanism comprises a driving assembly and a locking block, and the driving assembly is connected with the locking block and used for driving the locking block to move towards the casing pipe in the radial direction of the casing pipe, so that the casing pipe is tightly held to achieve locking. The locking block can be driven by the driving assembly to move towards the casing pipe in the radial direction of the casing pipe, so that the casing pipe is tightly held to be locked, connection between the casing pipe head body and the casing pipe is reinforced, and loosening caused by the influence of underground complex working conditions in the later period is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of casing head, more specifically, it relates to a casing head with locking mechanism. BACKGROUND

[0002] The casing head is a very important wellhead device component in the oil and gas exploitation process, which is located at the wellhead and plays a key role in connecting the surface casing and each layer of casing and the wellhead device. The overall structure is usually columnar, generally designed as hollow to facilitate the passage of downhole fluid. The upper part of the casing head is provided with a connecting interface for connecting the wellhead device (such as a Christmas tree, a blowout preventer, etc.), which is stably connected and ensures the sealing property through a flange plate and other means, so as to control, monitor and perform other operations on the fluid produced or injected at the wellhead.

[0003] The conventional casing head often relies only on simple threaded connection or conventional sealing structure when connecting the casing. Under the influence of long-term complex downhole conditions, such as changes in formation pressure, vibration of the casing, etc., the connection may become loose. Once the connection is loose, not only will the sealing performance be reduced, causing safety hazards such as oil and gas leakage, but also the stability of the entire wellhead device may be affected, thereby interfering with normal exploitation operations.

[0004] Therefore, in order to solve the above technical problems, the present application provides a casing head with a locking mechanism. SUMMARY

[0005] In view of the deficiencies in the prior art, the purpose of the present utility model is to provide a casing head with a locking mechanism.

[0006] To achieve the above-mentioned purpose, the present utility model provides the following technical scheme: a casing head with a locking mechanism, comprising a casing head main body and a casing, the casing head main body is provided with a connecting part A at the bottom for connecting the casing, and locking mechanisms are installed on both sides of the casing head main body.

[0007] The locking mechanism comprises a driving assembly and a locking block, the driving assembly is connected with the locking block and is used to drive the locking block to move along the radial direction of the casing towards the casing direction, so as to tightly hold the casing and achieve locking.

[0008] Preferably, a flange plate is installed on the top of the casing head main body, which is used to fix the wellhead device and can more firmly connect with the wellhead device.

[0009] Preferably, a connecting part B is provided above the driving assembly at the side end of the casing head main body, which is used to connect with the detection device and facilitate the installation of the detection device.

[0010] Preferably, the locking block is in arc shape, and arc-shaped grooves are provided on both sides of the casing for inserting the locking block.

[0011] Preferably, the driving assembly comprises L-shaped plates fixed on both sides of the casing head body, screw rods are threadedly connected to the interiors of the L-shaped plates, the heads of the screw rods are rotationally connected with the locking blocks through bearings, and telescopic rods are installed at both side positions between the L-shaped plates and the locking blocks to maintain the back-and-forth linear movement of the locking blocks.

[0012] Preferably, the heads of the screw rods are fixedly connected with rotating plates, and threaded knife holes are formed in the surfaces of the rotating plates, the surfaces of the L-shaped plates are provided with annular groove seats for the insertion of the rotating plates around the screw rods, and the rotating plates are prevented from rotating due to external force.

[0013] Preferably, connecting shells are fixedly connected to both side positions of the annular groove seats on the surfaces of the L-shaped plates, and the connecting shells are open towards the annular groove seats, guide rails for the sliding of sliding blocks are fixedly connected to the interiors of the connecting shells on the surfaces of the L-shaped plates, moving plates are fixedly connected to the surfaces of the sliding blocks, springs are fixedly connected between the back surfaces of the moving plates and the inner surfaces of the connecting shells, and baffle plates are welded to the surfaces of the moving plates.

[0014] Compared with the prior art, the casing head body locking device has the following beneficial effects:

[0015] 1. After the casing head body is connected to the casing through threads, the locking blocks are driven to move along the radial direction of the casing towards the casing by the driving assembly, so that the casing is tightly gripped to realize locking, the connection between the casing head body and the casing is reinforced, and the casing and the casing head are prevented from loosening due to the influence of complex downhole conditions in the background technology.

[0016] 2. When the locking blocks are driven to move along the radial direction of the casing towards the casing by the driving assembly, the locking blocks are inserted into the arc-shaped grooves on the casing, and the two are tightly fitted, so that clamping is realized in a concave-convex manner, a limiting structure is formed, and clamping is more reliable.

[0017] 3. When the casing is locked, the rotating plate is completely inserted into the annular groove seat, so that the side part of the rotating plate is prevented from being affected by external force and rotating to change the locking state.

[0018] 4. After the rotating plate is inserted into the annular groove seat after locking is completed, the two moving plates are loosened, the spring starts to drive the two moving plates to move towards the middle part for resetting, the two moving plates drive the two baffle plates to move towards the middle part, so that the two baffle plates block the surface of the rotating plate, the rotating plate is prevented from moving out of the annular groove seat from the back, and the locking state is further maintained. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings, which are included to provide a further understanding of the present application and are incorporated in and constitute a part of this application, illustrate embodiments of the present application and together with the description serve to explain the present application. In the drawings:

[0020] Figure 1 It is an overall structure schematic view of the present application;

[0021] Figure 2 It is a side structure schematic view of the present application;

[0022] Figure 3 It is a bottom structure schematic view of the present application;

[0023] Figure 4 It is a schematic view of the internal structure of the connecting shell in the present application.

[0024] In the figure: 1, sleeve head main body; 2, sleeve; 3, connecting part A;

[0025] 4, driving assembly; 401, L-shaped plate; 402, screw rod; 403, bearing; 404, telescopic rod; 405, rotating plate; 406, threaded knife hole; 407, annular groove seat; 408, connecting shell; 409, guide rail; 410, sliding block; 411, moving plate; 412, spring; 413, baffle;

[0026] 5, locking block; 6, flange plate; 7, connecting part B; 8, arc-shaped groove. DETAILED DESCRIPTION

[0027] As Figures 1-4 shown, the present application provides a sleeve head with a locking mechanism, comprising a sleeve head main body 1 and a sleeve 2, the sleeve head main body 1 is provided with a connecting part A 3 at the bottom for connecting with the sleeve, and the two sides of the sleeve head main body 1 are both provided with a locking mechanism.

[0028] The locking mechanism comprises a driving assembly 4 and a locking block 5, and the driving assembly 4 is connected with the locking block 5.

[0029] After the sleeve 2 is connected with the sleeve head main body 1 through threads, the locking block 5 can be driven by the driving assembly 4 to move along the radial direction of the sleeve 2 to the sleeve 2, so as to tightly hold the sleeve 2 to realize locking, thereby reinforcing the connection between the sleeve head main body 1 and the sleeve 2, and avoiding loosening caused by the influence of complex downhole conditions in the later period.

[0030] The driving assembly 4 comprises L-shaped plates 401 fixed on both sides of the sleeve head main body 1, screw rods 402 are threadedly connected in the L-shaped plates 401, the heads of the screw rods 402 are rotatably connected with the locking block 5 through bearings 403, and telescopic rods 404 are installed between the L-shaped plates 401 and the locking block 5.

[0031] In use, rotate the screw 402 clockwise or counterclockwise, the screw 402 moves forward and backward along the L-shaped plate 401, the L-shaped plate 401 drives the front and back movement of the locking block 5, and the telescopic rod 404 follows the telescopic movement to maintain the straight movement of the locking block 5, so as to realize the locking or unlocking operation of the casing 2.

[0032] Further, the locking block 5 is arc-shaped, and the casing 21 is provided with an arc-shaped groove 8 on both sides for inserting the locking block 5, that is, when the driving assembly 4 drives the locking block 5 to move along the radial direction of the casing 2 to the casing 2, the locking block 5 on it is just inserted into the arc-shaped groove 8 on the casing 2, and the two are tightly fitted, so that the clamping is carried out in a concave-convex matching way, forming a limiting structure, so that the clamping is more firm. The top of the casing head body 1 is provided with a flange plate 6, which is used to fix the wellhead device. The flange plate 6 can be tightly fixed with the wellhead device through bolts and other connecting members, which can effectively bear the weight of the wellhead device and various external forces generated by the change of downhole pressure, equipment operation vibration and other factors in the process of oil and gas exploitation, so as to ensure that the wellhead device remains stable at the wellhead position and does not loosen or shift, thereby ensuring the smooth progress of the entire exploitation operation. In addition, the side end of the casing head body 1 is provided with a connecting part B7 above the driving assembly 4, which is used to connect with the detection device. The connecting part B7 is provided with mounting holes, which is more convenient for installing the detection device on the casing head body 1.

[0033] Meanwhile, the head of the screw 402 is fixedly connected with a rotating plate 405, and a screw hole 406 is formed in the surface of the rotating plate 405. The surface of the L-shaped plate 401 is provided with an annular groove seat 407 for inserting the rotating plate 405 around the screw 402. By inserting the screwdriver into the screw hole 406 on the rotating plate 405, the rotating plate 405 is rotated by the screwdriver, thereby driving the rotation of the screw 402, realizing the locking or unlocking operation of the casing 2. When the casing 2 is locked, the rotating plate 405 completely enters the annular groove seat 407, avoiding the loosening of the rotating plate 405 due to external force (mainly external force generated by external impact) after locking, which changes the locking state.

[0034] Furthermore, the surface of the L-shaped plate 401 is fixedly connected with a connecting shell 408 at both side parts of the annular groove seat 407, and the connecting shell 408 is open towards the annular groove seat 407. The surface of the L-shaped plate 401 is fixedly connected with a guide rail 409 for sliding of a sliding block 410 in the inner part of the connecting shell 408. The surface of the sliding block 410 is fixedly connected with a moving plate 411. The back surface of the moving plate 411 and the inner surface of the connecting shell 408 are fixedly connected with a spring 412. The surface of the moving plate 411 is welded with a baffle 413.

[0035] When the rotating plate 405 rotates, the two side baffles 413 are pushed to the two sides, and are pushed into the connecting shell 408, the moving plate 411 is driven to move by the baffles 413, the slider 410 slides along the guide rail 409 to maintain the linear movement of the moving plate 411 and the baffles 413, and the spring 412 is compressed, after the rotating plate 405 is locked into the annular groove seat 407, the two side moving plates 411 are released, the spring 412 drives the two moving plates 411 to move to the middle part for resetting by the elasticity, the moving plate 411 drives the two baffles 413 to move to the middle part, so that the two baffles 413 block the surface of the rotating plate 405, the rotating plate 405 is prevented from moving backward and out of the annular groove seat 407, and the locked state is further maintained.

[0036] The above is only a preferred embodiment of the present application, and does not limit the present application in any form; any ordinary technical personnel in the industry can implement the present application according to the drawings and the above description; however, any equivalent changes, modifications and evolutions made by the technical personnel familiar with the professional within the scope of the technical scheme of the present application, using the disclosed technical content, are equivalent embodiments of the present application; at the same time, any equivalent changes, modifications and evolutions made according to the essential technology of the present application to the above embodiments are still within the protection scope of the technical scheme of the present application.

Claims

1. A sleeve head with a locking mechanism, comprising a sleeve head body (1) and a sleeve (2), wherein the bottom of the sleeve head body (1) is provided with a connecting part A (3) for connecting to the sleeve (2), characterized in that: Locking mechanisms are installed on both sides of the sleeve head body (1); The locking mechanism includes a drive assembly (4) and a locking block (5). The drive assembly (4) is connected to the locking block (5) and is used to drive the locking block (5) to move radially toward the sleeve (2) to clamp the sleeve (2) and achieve locking. The drive assembly (4) includes an L-shaped plate (401) fixed on both sides of the sleeve head body (1). The L-shaped plate (401) is internally threaded with a screw (402). The head of the screw (402) is rotatably connected to the locking block (5) through a bearing (403). Telescopic rods (404) are installed on both sides between the L-shaped plate (401) and the locking block (5).

2. A sleeve head with a locking mechanism according to claim 1, characterized in that: A flange (6) is installed on the top of the casing head body (1) to fix the wellhead device.

3. A sleeve head with a locking mechanism according to claim 1, characterized in that: The side end of the sleeve head body (1) is provided with a connecting part B (7) above the drive assembly (4) for connecting to the detection device.

4. A sleeve head with a locking mechanism according to claim 3, characterized in that: The locking block (5) is arc-shaped, and the sleeve (2) has arc-shaped grooves (8) on both sides for the locking block (5) to be inserted.

5. A sleeve head with a locking mechanism according to claim 1, characterized in that: The head of the screw (402) is fixedly connected to a rotating plate (405), and a threaded cutting hole (406) is provided on its surface. The surface of the L-shaped plate (401) is provided with an annular groove seat (407) for the rotating plate (405) to be inserted around the screw (402).

6. A sleeve head with a locking mechanism according to claim 5, characterized in that: The L-shaped plate (401) is fixedly connected to the connecting shell (408) on both sides of the annular groove seat (407), and the connecting shell (408) is open in the direction of the annular groove seat (407). The L-shaped plate (401) is fixedly connected to the guide rail (409) for sliding the slider (410) in the inner part of the connecting shell (408). The slider (410) is fixedly connected to the moving plate (411). The back of the moving plate (411) is fixedly connected to the inner surface of the connecting shell (408). The moving plate (411) is welded to the surface of the moving plate (411).

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