Novel underwater wellhead connector

Abstract

The utility model relates to the technical field of ocean engineering, in particular to a novel underwater wellhead connector which is characterized in that a connecting cylinder is sleeved on an underwater well; a hydraulic control assembly is arranged outside the connecting cylinder; a clamping and locking assembly is arranged in the connecting cylinder and comprises a locking block and an elastic piece, the locking block is arranged on the inner wall of the connecting cylinder and connected with the elastic piece, one end of the locking block is connected with the underwater well in a clamped mode, and the other end of the locking block abuts against the hydraulic pushing structure. The hydraulic pushing structure comprises a pushing block, hydraulic pushing pieces are arranged at the two sliding ends of the pushing block respectively, and the hydraulic pushing pieces are connected with a hydraulic control assembly to conduct hydraulic pushing. A secondary unlocking block is further arranged at one end of the pushing block, and hydraulic pushing pieces are arranged at the two sliding ends of the secondary unlocking block correspondingly. The utility model aims to solve the technical problems that the underwater wellhead connector is convenient to install, accurate in guiding and capable of being unlocked for the second time.

Description

Technical Field

[0001] This utility model relates to the field of marine engineering technology, and more specifically, to a novel underwater wellhead connector. Background Technology

[0002] Subsea oil and gas extraction is a crucial method in modern offshore oil and gas development, and the design and installation of subsea wellhead connectors are a vital aspect of this process. These connectors connect the wellhead to components such as the wellhead tree and the blowout preventer (BOP), ensuring the safe and efficient transfer of oil and gas. Subsea wellhead connectors primarily connect the subsea wellhead to the surface production platform for oil and gas extraction operations. This requires the connectors to be able to safely, stably, and quickly connect to or unlock above the wellhead, and seal the pressure inside the well to guarantee the safety of the connection process. Furthermore, they must be able to reliably and quickly unlock even under the harsh conditions of the offshore environment.

[0003] In existing technologies, the design of underwater wellhead connectors lacks a guiding structure for lowering, making the connector prone to deviating from the wellhead during underwater installation due to seawater fluctuations, resulting in a loose connection. Furthermore, existing connectors have complex structures and use bolt-type fixing methods, making tightening and unlocking cumbersome and lacking contingency plans for unexpected situations. Additionally, the connectors lack internal guiding functions for the installation of subsequent equipment, making the installation and positioning of subsequent equipment within the connector difficult. Utility Model Content

[0004] The purpose of this application is to provide a new type of underwater wellhead connector, which aims to solve the technical problems of convenient installation, accurate guidance and secondary unlocking of underwater wellhead connectors.

[0005] To solve the above-mentioned technical problems, the solution adopted in this application is as follows:

[0006] A novel underwater wellhead connector includes an underwater well passage, on which a connecting cylinder is coaxially sleeved.

[0007] Preferably, a hydraulic control assembly is provided on the outer wall of the connecting cylinder. The hydraulic control assembly includes a hydraulic cylinder and a main valve pipe. The hydraulic cylinder is located on the cylinder wall, and the hydraulic port of the hydraulic cylinder is connected to the main valve pipe.

[0008] Preferably, the inner wall of the connecting cylinder is provided with a locking assembly, which includes a locking block and an elastic element. The locking block is provided on the inner wall of the connecting cylinder and is connected to the elastic element. The elastic element is provided on the inner wall and the elastic extension direction of the elastic element is perpendicular to the axial direction of the underwater well. One end of the locking block is engaged with the outer wall of the wellhead end of the underwater well, and the other end of the locking block abuts against the pushing end of the hydraulic push structure.

[0009] Preferably, the hydraulic push structure includes a push block, which is slidably disposed inside the connecting cylinder. The sliding direction of the push block is along the axial direction of the underwater well. Hydraulic push components are respectively provided at both sliding ends of the push block. Each hydraulic push component includes a branch valve pipe. All branch valve pipes are connected to a main valve pipe. The valve control end of each branch valve pipe is connected to its corresponding auxiliary controller through an electrical circuit.

[0010] Preferably, the pushing end of the push block is further provided with a secondary unlocking block, the sliding direction of the secondary unlocking block is the same as that of the push block, the sliding ends of the secondary unlocking block are respectively provided with hydraulic pushers, and the secondary unlocking block and the push block are provided with the same hydraulic pusher.

[0011] Preferably, the connecting cylinder is further connected to a guide structure, which includes a guide shaft and a guide sleeve. The guide sleeve is disposed outside the connecting cylinder, and the guide shaft is disposed outside the underwater well. The guide shaft and the guide sleeve are slidably connected, and the sliding direction is consistent with the axial direction of the underwater well.

[0012] Preferably, the connecting cylinder is further provided with a positioning component, which includes a fixing block and a positioning block. The fixing block is fixed to the outer wall of the connecting cylinder, and the positioning block slides through the connecting cylinder. One end of the positioning block is located inside the connecting cylinder, and the sliding direction is perpendicular to the axis of the connecting cylinder.

[0013] Preferably, a hydraulic pusher is provided between the fixed block and the positioning block, and a spring is connected between the positioning block and the connecting cylinder, wherein the elastic displacement direction of the spring is consistent with the sliding direction of the positioning block.

[0014] Preferably, one end of the positioning block near the fixed block is fixedly connected to one end of the pin, and the other end of the pin is slidably inserted into the fixed block, with the other end of the pin located outside the connecting cylinder.

[0015] Preferably, a hydraulic pusher is also provided at the connection end between the spring and the positioning block.

[0016] Preferably, the hydraulic pusher in the positioning assembly is provided with sealing gaskets at both ends, and the sealing gaskets are fixedly installed on the positioning block and the fixing block respectively, and the sealing gaskets slide in contact with the connecting cylinder.

[0017] Preferably, a sealing assembly is provided between the connecting cylinder and the wellhead end of the underwater well. The sealing assembly includes an annular washer, which is fixed inside the connecting cylinder and abuts against the wellhead end face of the underwater well.

[0018] Preferably, the elastic element includes a retaining pin and a disc spring.

[0019] Preferably, the fixing pin is fixed inside the connecting cylinder, the fixing pin passes through the through hole in the locking block, the axial direction of the fixing pin is perpendicular to the axial direction of the underwater well, and several butterfly springs are sleeved on the axial direction of the fixing pin.

[0020] Preferably, the butterfly spring has a trumpet-shaped structure, and the outermost edge of the butterfly spring abuts against the wall of the through hole on the lock block.

[0021] Preferably, a number of locking blocks are arranged circumferentially on the inner wall of the connecting cylinder, and the number of locking blocks corresponds one-to-one with the number of elastic components.

[0022] Preferably, the hydraulic actuator includes a hydraulic chamber, a hydraulic channel, and a branch valve pipe.

[0023] Preferably, the hydraulic chamber is located inside the connecting cylinder, the hydraulic chamber is connected to one end of the hydraulic channel, the other end of the hydraulic channel is connected to the branch valve pipe, and the branch valve pipe is connected to the main valve pipe.

[0024] Preferably, both the push block and the secondary unlocking block are provided with sealing rings, which are located between the sliding ends of the push block and the secondary unlocking block.

[0025] The technical solution of this application has at least the following advantages and beneficial effects:

[0026] In this utility model, a guide sleeve is set outside the connecting cylinder, and a guide shaft is set outside the underwater well. The cable in the guide shaft is used for coarse guidance, and the guide column is used for precise guidance, so as to ensure the connection accuracy between the connector and the underwater well.

[0027] In this utility model, a hydraulic control component is set up to drive hydraulic pushers at different positions to work individually. The hydraulic system quickly drives the locking block in the locking component to engage with the protrusion on the outer wall of the underwater well, thereby achieving rapid locking or unlocking of the connector and the underwater well.

[0028] In this invention, when normal unlocking fails, the secondary locking block can be displaced by the corresponding hydraulic pusher to assist the sliding of the pusher, thereby using secondary unlocking to ensure normal unlocking of the connector and the underwater well, thus ensuring safety.

[0029] In this invention, by setting a positioning component and a positioning end inside the connecting tube, subsequent underwater operation components entering the connecting tube can be guided and positioned by the positioning end, and can be quickly positioned and installed inside the connector. Attached Figure Description

[0030] Figure 1 This is a cross-sectional structural diagram of the present invention.

[0031] Figure 2 This is a front view structural diagram of the present invention.

[0032] Figure 3 In this utility model Figure 1 Enlarged structural diagram of A in the middle

[0033] Figure 4 This is a cross-sectional view of the hydraulic actuation structure in this utility model.

[0034] Figure 5 This is a cross-sectional view of the card lock assembly in this utility model.

[0035] In the diagram: 1-Guide structure, 101-Guide arm, 102-Sleeve, 103-Guide post, 104-Cable, 2-Hydraulic control assembly, 201-Hydraulic cylinder, 202-Main valve pipe, 3-Positioning assembly, 301-Fixing block, 302-Positioning block, 303-Pin, 304-Hydraulic chamber one, 305-Spring, 306-Sealing gasket, 307-Branch valve pipe, 308-Hydraulic channel, 309-Hydraulic chamber II. 4-Connecting cylinder, 5-Sealing assembly, 501-Annular washer, 502-Bolt, 6-Protective outer cylinder, 7-Guide inner cylinder, 8-Locking assembly, 801-Locking block, 802-Fixing pin, 803-Butterfly spring, 9-Hydraulic push structure, 901-Push block, 902-Hydraulic chamber three, 903-Hydraulic chamber four, 904-Hydraulic chamber five, 905-Sealing ring, 10-Secondary locking block, 11-Underwater wellbore. Detailed Implementation

[0036] 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.

[0037] It should be noted that similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. The terms "center," "upper," "lower," "inner," and "outer," indicating orientation or positional relationships based on the orientation or positional relationships shown in the figures, or the orientation or positional relationships commonly used when the product is in use, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as a limitation on this application. It should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] Example

[0039] Please refer to Figures 1-5 This utility model provides a novel underwater wellhead connector, including a guide structure 1, a hydraulic control component 2, a positioning component 3, a connecting cylinder 4, a sealing component 5, a protective outer cylinder 6, a guide inner cylinder 7, a locking component 8, a hydraulic push structure 9, a secondary unlocking block 801, and an underwater well passage 11.

[0040] Furthermore, the connecting cylinder 4 is used to connect the wellhead of the underwater well 11, so that the underwater well 11 can be connected to the surface production platform through the connecting cylinder 4. The connecting cylinder 4 is connected to the guide structure 1, so that the connecting cylinder 4 is guided and fitted to the wellhead of the underwater well 11.

[0041] The guide structure 1 includes a guide shaft and a guide sleeve 102. The guide sleeve 102 is disposed outside the connecting cylinder 4 and moves with the connecting cylinder 4 toward the underwater well 11, while the guide shaft is fixedly disposed at the bottom of the water and located outside the underwater well 11.

[0042] Preferably, when connecting the connecting cylinder 4 and the underwater well 11, the guide sleeve 102 on the connecting cylinder 4 will be sleeved on the guide shaft, so that the two are slidably connected in the upper and lower parts, and the sliding direction is consistent with the axial direction of the underwater well 11, thereby ensuring that the connecting cylinder 4 and the underwater well 11 are coaxially connected together.

[0043] Furthermore, when the lower part of the connecting cylinder 4 is fitted onto the wellhead end of the underwater well 11, the wellhead end is enclosed by the inner wall of the connecting cylinder 4, and the sealing component 5 set inside the connecting cylinder 4 will contact the wellhead end to seal the fitting gap between the connecting cylinder 4 and the underwater well 11, preventing external water from entering the connecting cylinder 4 and the underwater well 11, thereby sealing the pressure inside the well and facilitating subsequent well operations.

[0044] Specifically, the sealing assembly 5 includes an annular washer 501 and a bolt 502. The annular washer 501 is locked to the inner wall of the connecting cylinder 4 by the bolt 502, and the pad surface of the annular washer 501 abuts against the wellhead end face of the underwater well 11 to seal.

[0045] Furthermore, after the connecting sleeve 4 is fitted onto the underwater well 11 and the pressure inside the well is guaranteed, the connecting sleeve 4 and the underwater well 11 need to be locked together to achieve a stable connection.

[0046] Hydraulic control component 2 is provided on the outer wall of the connecting cylinder 4, and locking component 8 is provided below the connecting cylinder 4. The locking component 8 is locked onto the outer wall of the underwater well 11. The locking component 8 is connected to the pushing end of the hydraulic push structure 9, and the hydraulic drive end of the hydraulic push structure 9 is connected to the hydraulic control component 2. Thus, the locking component 8 is displaced by hydraulic control to lock and match with the protrusion on the outer wall of the underwater well 11, thereby achieving the fixed locking of the connecting cylinder 4 and the underwater well 11.

[0047] The hydraulic control component 2 includes a hydraulic cylinder 201 and a main valve pipe 202. The hydraulic cylinder 201 is fixedly installed on the cylinder wall. The hydraulic port of the hydraulic cylinder 201 is connected to the main valve pipe 202. The valve of the main valve pipe 202 is connected to the main controller through an electrical circuit to control its closure, thereby realizing the flow of liquid medium in the hydraulic cylinder 201.

[0048] The locking assembly 8 includes a locking block 801 and an elastic element. The locking block 801 is slidably disposed on the inner wall of the connecting cylinder 4, with the sliding direction perpendicular to the axial direction of the underwater well 11. The locking block 801 is connected to one end of the elastic element, and the other end of the elastic element is disposed on the inner wall. The elastic extension and contraction direction of the elastic element is also perpendicular to the axial direction of the underwater well 11. One end of the locking block 801 is engaged with the outer wall of the wellhead end of the underwater well 11, and the other end of the locking block 801 abuts against the pushing end of the hydraulic push structure 9.

[0049] Preferably, when the hydraulic push structure 9 pushes the locking block 801 to slide, the locking block 801 will move in the radial direction of the underwater well 11, approach the protrusion on the outer wall of the underwater well 11 and lock together, thus achieving locking and fixing; at this time, the elastic component will also elastically extend and retract due to the sliding of the locking block 801, applying an elastic force to the displaced locking block 801. When the hydraulic push structure 9 resets, the locking block 801, which is no longer pushed, will also reset and slide under the elastic force of the elastic component, thereby separating the locking block 801 from the protrusion on the outer wall of the well, and quickly unlocking the connecting cylinder 4 and the underwater well 11.

[0050] In addition, several locking blocks 801 are arranged circumferentially on the inner wall of the connecting cylinder 4, and the number of locking blocks 801 corresponds one-to-one with the number of elastic components.

[0051] Preferably, several locking blocks 801 and elastic components are separately disposed on the inner wall of the connecting cylinder 4. Therefore, when the separated locking blocks 801 are pushed by the hydraulic push structure 9, they can all be displaced in the axial direction of the underwater well 11, thereby moving inward to catch the protrusion on the outer wall of the well, increasing the stability after locking and making it less likely to detach.

[0052] Please refer to Figure 4 and Figure 5 In this embodiment, the elastic elements of the locking assembly 8 include a fixing pin 802 and a butterfly spring 803.

[0053] Specifically, the fixing pin 802 is fixedly installed on the inner wall of the connecting cylinder 4, and the locking block 801 has a through hole running horizontally through it. The fixing pin 802 passes through the through hole in the locking block 801. The axial direction of the fixing pin 802 is perpendicular to the axial direction of the underwater well 11. The two ends of the fixing pin 802 restrict the movement of the locking block 801 along the axial direction of the fixing pin 802. Several butterfly springs 803 are fixedly sleeved in the axial direction of the fixing pin 802. The butterfly springs 803 have a horn-shaped structure. When the butterfly springs 803 are subjected to radial force from the fixing pin 802, the horn-shaped structure will undergo elastic deformation, thereby generating elastic force.

[0054] Preferably, the outermost edge of the disc spring 803 abuts against the wall of the through hole on the locking block 801. When one end of the locking block 801 is pushed by the hydraulic push structure 9, the locking block 801 is displaced along the radial direction of the fixing pin 802. At this time, the side of the through hole near the push end will apply a pushing force to the disc spring 803, causing the end of the disc spring 803 to undergo elastic deformation and apply a reverse elastic force to the locking block 801. At this time, the locking block 801 locks the underwater well 11. When the hydraulic push structure 9 resets, the pushing force disappears, and the locking block 801 will quickly reset under the elastic force of the disc spring 803.

[0055] Preferably, the reason for using a disc spring 803 in this embodiment is that a disc spring 803 is generally composed of multiple disc-shaped spring pieces. Different stiffness characteristics can be obtained by changing the number or combination of discs. Thus, by utilizing its variable stiffness characteristics and good buffering and vibration absorption capabilities, it can be applied to various application environments that need to withstand large loads and small spaces. Therefore, in high-pressure underwater environments and high-load hydraulic drive environments, the disc spring 803 is more suitable than the ordinary spring 305.

[0056] Furthermore, a protective outer cylinder 6 and a guide inner cylinder 7 are coaxially fixedly connected below the connecting cylinder 4. The outer diameter of the protective outer cylinder 6 is the same as that of the connecting cylinder 4, and the inner diameter of the guide inner cylinder 7 is the same as that of the connecting cylinder 4. A hydraulic push structure 9 is provided between the protective outer cylinder 6 and the guide inner cylinder 7, which is protected by the protective outer cylinder 6. The inner end of the guide inner cylinder 7 away from the connecting cylinder 4 is provided with a chamfer. When the connecting cylinder 4 drives the guide cylinder to engage with the underwater well 11, the guide cylinder provides a certain degree of guidance by utilizing the chamfer.

[0057] For further details, please refer to... Figure 4 In this embodiment, the hydraulic actuation structure 9 includes a push block 901, a hydraulic actuation component, and a sealing ring 905.

[0058] A sliding cavity is provided between the inner wall of the protective cylinder and the outer wall of the guide cylinder. A push block 901 is slidably arranged in the sliding cavity. The sliding direction of the push block 901 is along the axial direction of the underwater well 11. Hydraulic pushers are fixedly arranged at both sliding ends of the push block 901. The sliding ends of the push block 901 are set as locking ends and unlocking ends.

[0059] Preferably, a locking block 801 is slidably inserted through one end of the sliding cavity. When the hydraulic pusher is not working and the pusher 901 is in its initial position, one end of the locking block 801 is located in the sliding cavity and does not contact the pusher 901. When the underwater well 11 is locked and fixed, the hydraulic pusher at the locking end begins to push the pusher 901 to slide, and the pusher 901 begins to slide to the corresponding position of the locking block 801, pushing the locking block 801 to slide radially toward the underwater well 11 to achieve locking and fixing. When the underwater well 11 is unlocked, the hydraulic pusher at the unlocking end begins to push the pusher 901 to slide and reset, and the hydraulic pusher at the locking end retracts and resets synchronously, so that the pusher 901 and the locking block 801 are separated, and the locking block 801 is reset under the action of the elastic component to achieve unlocking.

[0060] In addition, sealing rings 905 are fitted onto the sliding ends of push block 901. The sealing rings 905 are slidably connected to the wall of the sliding cavity, thereby sealing and isolating the hydraulic pusher at both sliding ends of push block 901 from lock block 801, preventing water from flowing into the sliding cavity and hydraulic pusher at the outer wall of the well, thus affecting the locking function.

[0061] Specifically, the hydraulic actuator includes a branch valve pipe 307, a hydraulic channel 308, and a hydraulic chamber.

[0062] The hydraulic chamber contains a liquid medium. The hydraulic chamber is connected to one end of the hydraulic channel 308, and the other end of the hydraulic channel 308 is connected to the branch valve pipe 307. The branch valve pipe 307 is connected to the main valve in the hydraulic control component 2, thereby changing the hydraulic pressure in the hydraulic chamber by using the hydraulic pressure of the hydraulic cylinder 201, thereby generating hydraulic thrust.

[0063] Preferably, the hydraulic push structure 9 is provided with multiple hydraulic pushers, and all the branch valve pipes 307 on these hydraulic pushers are connected to a main valve pipe 202. The main valve pipe 202 is used to supply hydraulic pressure to the hydraulic cylinder 201. The valve control end of each branch valve pipe 307 is connected to its corresponding auxiliary controller through an electrical circuit. Different auxiliary controllers control the opening and closing of the valves of different branch valve pipes 307, thereby performing hydraulic work on the hydraulic pushers at different positions.

[0064] In this embodiment, the hydraulic chamber in the hydraulic pusher at the locking end of the push block 901 is configured as hydraulic chamber three 902; the hydraulic chamber in the hydraulic pusher at the unlocking end of the push block 901 is configured as hydraulic chamber four 903.

[0065] Furthermore, a secondary unlocking block 801 is also provided at the unlocking end of the push block 901. The secondary unlocking block 801 also slides in the sliding cavity. The secondary unlocking block 801 and the push block 901 are respectively located at the two ends of the hydraulic pusher at the unlocking end, so that the sliding direction of the secondary unlocking block 801 and the push block 901 is the same. In addition, a hydraulic pusher is also provided at the other sliding end of the secondary unlocking block 801. The hydraulic pusher at this end is fixedly installed between the secondary unlocking block 801 and the guide cylinder.

[0066] Preferably, when the hydraulic push structure 9 is performing its locking and unlocking functions normally, only the hydraulic pushers at the locking and unlocking ends of the push block 901 are working, while the hydraulic pusher at the other sliding end of the secondary unlocking block 801 is not working, allowing the push block 901 to work while the secondary unlocking block 801 does not slide. When the push block 901 and the hydraulic pusher at the unlocking end of the push block 901 malfunction, preventing the push block 901 from pushing the locking block 801 to unlock the underwater well 11, the hydraulic pusher at the other sliding end of the secondary unlocking block 801 will start working, causing the secondary locking block 10 to abut against the hydraulic pusher at the unlocking end of the push block 901, thereby applying a thrust to reset the push block 901. This allows for secondary unlocking when the normal unlocking function is unavailable, improving the safety of underwater operations.

[0067] In addition, sealing rings 905 are also fitted on the sliding ends of the secondary locking block 10. The sealing rings 905 are slidably connected to the sliding cavity wall to ensure the sealing and isolation of the hydraulic pushers at the sliding ends of the secondary locking block 10.

[0068] Please refer to Figure 2 and Figure 3 In this embodiment, a positioning component 3 is also provided on the connecting cylinder 4. The positioning end of the positioning component 3 passes through the cylinder of the connecting cylinder 4. After the connecting cylinder 4 is locked and fixed with the underwater well 11, the positioning component 3 can perform coarse positioning on each underwater operation component that subsequently enters the connecting cylinder 4, ensuring that the underwater operation component can be guided to the underwater well 11 below for operation with relatively high accuracy.

[0069] The positioning component 3 includes a fixing block 301, a positioning block 302, a pin 303, a hydraulic pusher, a spring 305, and a sealing gasket 306.

[0070] Specifically, the fixing block 301 is fixed to the outer wall of the connecting cylinder 4, and the positioning block 302 is slidably inserted into the connecting cylinder 4. The positioning end of the positioning block 302 is located inside the connecting cylinder 4, and the sliding direction is perpendicular to the axis of the connecting cylinder 4. A hydraulic pusher is provided between the fixing block 301 and the positioning block 302. A sliding cavity is provided between the positioning block 302 and the connecting cylinder 4. A spring 305 is provided inside the sliding cavity. The spring 305 is sleeved on the outside of the positioning block 302. One end of the spring 305 is fixedly connected to the positioning block 302, and the other end of the spring 305 is fixedly connected to the cavity wall of the sliding cavity. The elastic displacement direction of the spring 305 is consistent with the sliding direction of the positioning block 302.

[0071] Preferably, when it is necessary to guide and position the underwater operation component entering the connecting cylinder 4, the hydraulic pusher located between the fixed block 301 and the positioning block 302 hydraulically pushes the positioning block 302 to slide towards the inside of the connecting cylinder 4, and uses the positioning end for positioning. After the positioning block 302 slides, the spring 305 in the sliding cavity will elastically contract and generate elastic force. After the positioning is completed, the hydraulic pusher resets and no longer applies hydraulic thrust to the positioning block 302. Then the positioning block 302 will elastically reset under the elastic force of the contracted spring 305 and slide towards the outside of the connecting cylinder 4.

[0072] One end of a pin 303 is fixedly connected to one end of the positioning block 302 near the fixing block 301. The other end of the pin 303 slides through the fixing block 301 and extends out to the outside of the connecting cylinder 4.

[0073] Preferably, when the positioning block 302 is positioned and guided by the hydraulic pusher, the pin 303 will move with the positioning block 302, so that the length of the pin 303 outside the connecting cylinder 4 is different. External personnel can observe the external length of the pin to easily determine whether the positioning end of the positioning block 302 inside the connecting cylinder 4 is properly positioned and guided with the underwater operation component.

[0074] In addition, a hydraulic pusher is also provided at the connection end between the spring 305 and the positioning block 302. When the hydraulic pusher between the positioning block 302 and the fixed block 301 fails, causing the positioning block 302 to fail to reset even when subjected to the spring force of the spring 305, the hydraulic pusher between the spring 305 and the positioning block 302 will start to work, thereby applying a hydraulic thrust to the positioning block 302 to reset it.

[0075] The hydraulic chamber in the hydraulic pusher located between the positioning block 302 and the fixing block 301 is configured as hydraulic chamber two 309; the hydraulic chamber in the hydraulic pusher located between the spring 305 and the positioning block 302 is configured as hydraulic chamber one 304.

[0076] In addition, annular sealing gaskets 306 are fixedly installed on the positioning block 302 and the fixing block 301. The sealing gaskets 306 are located at both ends of the two hydraulic pushers in the positioning assembly 3, and are used to seal the hydraulic chambers in the hydraulic pushers.

[0077] Please refer to Figure 2 In this embodiment, the guide shaft in the guide structure 1 includes a guide post 103 and a cable 104; the guide sleeve 102 in the guide structure 1 includes a guide arm 101 and a sleeve 102.

[0078] Specifically, the guide arm 101 is fixed to the outer wall of the connecting cylinder 4, and a sleeve 102 is fixedly provided at the end of the guide arm 101. The axial direction of the sleeve 102 is consistent with the axial direction of the connecting cylinder 4. The bottom of the guide column 103 is fixed to the bottom of the water and located on one side of the underwater well 11. The axial direction of the guide column 103 is consistent with the axial direction of the underwater well 11. A cable 104 is fixedly provided at the top of the guide column 103.

[0079] When connecting the sleeve 4 onto the underwater well 11, the cable 104 is first passed through the sleeve 102, so that the connecting sleeve 4 quickly approaches the underwater well 11 from the water surface via the cable 104. Then, the sleeve 102 slides over the cable 104 and is guided into the guide post 103. The guide post 103 then guides and limits the sleeve 102 to ensure that the connecting sleeve 4 approaching the underwater well 11 is coaxially aligned with the underwater well 11, thereby quickly and accurately connecting the connecting sleeve 4 onto the underwater well 11.

[0080] The various embodiments of this utility model have now been described in detail. To avoid obscuring the concept of this utility model, some details known in the art have not been described. Those skilled in the art will fully understand how to implement the technical solution of this utility model based on the above description. The scope of this utility model is defined by the appended claims.

Claims

1. A novel underwater wellhead connector, comprising an underwater wellbore (11), characterized in that, A connecting cylinder (4) is coaxially sleeved on the underwater well (11); The outer wall of the connecting cylinder (4) is provided with a hydraulic control assembly (2). The hydraulic control assembly (2) includes a hydraulic cylinder (201) and a main valve pipe (202). The hydraulic cylinder (201) is provided on the cylinder wall, and the hydraulic port of the hydraulic cylinder (201) is connected to the main valve pipe (202). The inner wall of the connecting cylinder (4) is provided with a locking assembly (8), which includes a locking block (801) and an elastic element. The inner wall of the connecting cylinder (4) is provided with a locking block (801), which is connected to the elastic element. The elastic element is located on the inner wall, and the elastic extension direction of the elastic element is perpendicular to the axial direction of the underwater well (11). One end of the locking block (801) is engaged with the outer wall of the wellhead end of the underwater well (11), and the other end of the locking block (801) is abutted against the pushing end of the hydraulic push structure (9). The hydraulic push structure (9) includes a push block (901), which is slidably disposed inside the connecting cylinder (4). The sliding direction of the push block (901) is along the axial direction of the underwater well (11). Hydraulic push components are respectively provided at both sliding ends of the push block (901). Each hydraulic push component includes a branch valve pipe (307). All branch valve pipes (307) are connected to a main valve pipe (202). The valve control end of each branch valve pipe (307) is connected to its corresponding auxiliary controller through a circuit. The pusher (901) is also provided with a secondary unlocking block (801) at one end. The sliding direction of the secondary unlocking block (801) is the same as that of the pusher (901). Hydraulic pushers are provided at both ends of the sliding of the secondary unlocking block (801). The same hydraulic pusher is provided between the secondary unlocking block (801) and the pusher (901).

2. The novel underwater wellhead connector according to claim 1, characterized in that, The connecting cylinder (4) is also connected to a guide structure (1). The guide structure (1) includes a guide shaft and a guide sleeve (102). The guide sleeve (102) is located outside the connecting cylinder (4), and the guide shaft is located outside the underwater well (11). The guide shaft and the guide sleeve (102) are slidably connected, and the sliding direction is consistent with the axial direction of the underwater well (11).

3. A novel underwater wellhead connector according to claim 1, characterized in that, The connecting cylinder (4) is also provided with a positioning component (3). The positioning component (3) includes a fixing block (301) and a positioning block (302). The fixing block (301) is fixed to the outer wall of the connecting cylinder (4), and the positioning block (302) slides through the connecting cylinder (4). One end of the positioning block (302) is located inside the connecting cylinder (4), and the sliding direction is perpendicular to the axis of the connecting cylinder (4). A hydraulic pusher is provided between the fixed block (301) and the positioning block (302), and a spring (305) is connected between the positioning block (302) and the connecting cylinder (4). The elastic displacement direction of the spring (305) is consistent with the sliding direction of the positioning block (302).

4. A novel underwater wellhead connector according to claim 3, characterized in that, The positioning block (302) is fixedly connected to one end of the pin (303) near the fixed block (301), and the other end of the pin (303) is slidably inserted on the fixed block (301). The other end of the pin (303) is located outside the connecting cylinder (4).

5. A novel underwater wellhead connector according to claim 3, characterized in that, A hydraulic pusher is also provided at the connection end between the spring (305) and the positioning block (302); The hydraulic pusher in the positioning component (3) is provided with sealing gaskets (306) at both ends. The sealing gaskets (306) are fixedly installed on the positioning block (302) and the fixing block (301) respectively, and the sealing gaskets (306) slide in contact with the connecting cylinder (4).

6. A novel underwater wellhead connector according to claim 1, characterized in that, A sealing assembly (5) is provided between the connecting cylinder (4) and the wellhead end of the underwater well (11). The sealing assembly (5) includes an annular washer (501), which is fixed inside the connecting cylinder (4) and abuts against the wellhead end face of the underwater well (11).

7. A novel underwater wellhead connector according to claim 1, characterized in that, The elastic element includes a fixing pin (802) and a butterfly spring (803); The fixing pin (802) is fixed inside the connecting cylinder (4). The fixing pin (802) passes through the through hole in the locking block (801). The axial direction of the fixing pin (802) is perpendicular to the axial direction of the underwater well (11). Several butterfly springs (803) are sleeved on the axial direction of the fixing pin (802). The butterfly spring (803) has a trumpet-shaped structure, and the outermost edge of the butterfly spring (803) abuts against the wall of the through hole on the locking block (801).

8. A novel underwater wellhead connector according to claim 1, characterized in that, The inner wall of the connecting cylinder (4) is circumferentially arranged with a number of locking blocks (801), and the number of locking blocks (801) corresponds one-to-one with the number of elastic components.

9. A novel underwater wellhead connector according to claim 1, characterized in that, The hydraulic actuator includes a hydraulic chamber, a hydraulic channel (308), and a branch valve pipe (307); The hydraulic chamber is located inside the connecting cylinder (4). The hydraulic chamber is connected to one end of the hydraulic channel (308), and the other end of the hydraulic channel (308) is connected to the branch valve pipe (307). The branch valve pipe (307) is connected to the main valve pipe (202).

10. A novel underwater wellhead connector according to claim 1, characterized in that, Both the push block (901) and the secondary unlocking block (801) are provided with sealing rings (905), which are located between the sliding ends of the push block (901) and the secondary unlocking block (801).

Images