Underwater rapid connecting and locking Christmas tree cap

Abstract

The invention relates to the technical field of underwater Christmas tree equipment, in particular to an underwater quick connecting and locking Christmas tree cap which comprises an installation cap body, the installation cap body is arranged at the wellhead end of an underwater well, an oil pipe hanger is installed in the underwater well, and a sealed space is formed in the oil pipe hanger and the underwater well. The guiding structure is located between an oil pipe hanger in an underwater well and an installation cap body and used for installation guiding. A butt joint communication structure is arranged between the oil pipe hanger and the mounting cap body; the butt joint communication structure comprises a hydraulic male connecting plug which is arranged on the upper portion of the oil pipe hanger, and a hydraulic female connecting plug penetrates through the upper portion and the lower portion of the oil pipe hanger. And hydraulic pipelines penetrate through the interiors of the hydraulic male connecting plug and the hydraulic female connecting plug and are used for carrying out fluid conveying work on the sealed space. The underwater Christmas tree cap quick connecting and guiding locking device achieves the technical purposes of quick connecting, guiding and locking of an underwater Christmas tree cap, quick connection and sealing of a well and stable operation.

Description

Technical Field

[0001] The present invention relates to the technical field of subsea christmas tree equipment, and more particularly, to a subsea quick-connect locking christmas tree cap. Background Art

[0002] The subsea christmas tree is one of the core equipment for offshore oil and gas development, which is used to connect the oil and gas deep in the formation and the external transportation pipeline, control the oil and gas production rate, and monitor and adjust the production situation in real time. The subsea christmas tree cap is used to connect and lock with the subsea christmas tree body, provide a production channel and a cable crossing channel for underwater connection, quickly connect the tubing hanger of the underwater wellbore, and the tubing hanger is a key device for supporting the tubing string and sealing the key part between the underwater wellbore and the casing, ensuring the smooth production of oil and gas and the safety of downhole operations.

[0003] In underwater oil and gas production, after the underwater wellbore is installed, the christmas tree cap needs to be installed. Since the underwater wellhead is in the seawater with extremely complex environmental conditions, with waves surging and low visibility, complex and delicate additional operations cannot be carried out underwater. There is a need for a tree cap device with quick guiding docking and quick locking installation for underwater wellheads to provide a safe and stable underwater operation environment.

[0004] The Chinese patent with the patent name of "Mechanical Quick Locking Device for Subsea Christmas Tree Cap" and the publication number of CN118373300A has been publicly disclosed. This patent includes a housing, a lifting mechanism on the housing, and at least one set of locking components on the side of the housing; the locking components include a locking rod and a jaw, a lock hole is provided on the side of the housing, and the lock hole is axially adapted to the locking rod; the jaw is connected to one end of the locking rod close to the inside of the housing and moves axially along it, and moves towards the housing to clamp or disengage from the profile of the christmas tree cap. This invention can quickly lock through a mechanical structure, reduce the working intensity during lifting operations, and increase the safety factor.

[0005] Although this device can quickly lock the subsea christmas tree cap on the underwater wellbore, it cannot continue to seal the inside of the locked underwater wellbore and conduct stable underwater operations under a sealed state. Summary of the Invention

[0006] The purpose of the present application is to provide a subsea quick-connect locking christmas tree cap, which solves the technical problems of quick connection, guiding and locking of the subsea christmas tree cap, quickly connecting and sealing the wellbore and conducting stable operations.

[0007] To solve the above technical problems, the following solutions are adopted in the present application:

[0008] An underwater quick-connect and locking Christmas tree cap, comprising an installation cap body, the installation cap body is arranged at the wellhead end of an underwater wellbore, a tubing hanger is fixedly installed in the underwater wellbore, and a sealed space is formed between the lower part of the tubing hanger and the inside of the underwater wellbore.

[0009] Preferably, a guiding structure is installed below the installation cap body, and the guiding structure is located between the tubing hanger and the installation cap body in the underwater wellbore.

[0010] Preferably, a docking and connecting structure is also arranged between the tubing hanger and the installation cap body.

[0011] Preferably, the docking and connecting structure includes a hydraulic male plug and a hydraulic female plug. The hydraulic male plug is arranged at the upper part of the tubing hanger, and the hydraulic female plug penetrates through the upper and lower parts of the tubing hanger.

[0012] Preferably, hydraulic pipelines run through the hydraulic male plug and the hydraulic female plug. When the two are matched and plugged, the hydraulic pipelines inside the hydraulic male plug and the hydraulic female plug are connected.

[0013] Preferably, the guiding structure includes a clamping block and a clamping groove. The clamping block is arranged below the installation cap body, the clamping groove is arranged above the tubing hanger, and the clamping block is clamped with the clamping groove in a matching manner.

[0014] Preferably, crankshaft rotation locking structures are symmetrically arranged on both sides of the installation cap body, and the locking ends of the crankshaft rotation locking structures are clamped and locked with the outer wall of the underwater wellbore.

[0015] Preferably, clamping blocks are symmetrically arranged on both sides below the installation cap body, and the clamping blocks on both sides are respectively set as clamping block one and clamping block two.

[0016] Preferably, the clamping area of clamping block one is larger than that of clamping block two.

[0017] Preferably, a plug rod is arranged below the hydraulic male plug, and the plug rod is vertically and slidably inserted into the hydraulic pipeline of the hydraulic female plug.

[0018] Preferably, a hydraulic pipeline runs through the plug rod and is connected to the hydraulic pipeline of the hydraulic male plug. A one-way valve is arranged in the hydraulic pipeline of the hydraulic female plug, and a hydraulic port is arranged below the hydraulic female plug, and the hydraulic port is connected to the hydraulic pipeline.

[0019] Preferably, when the hydraulic male plug and the hydraulic female plug are plugged and matched, the plug rod passes through the one-way valve, the one-way valve opens, and the flow direction inside the valve of the one-way valve is from the hydraulic male plug towards the hydraulic female plug.

[0020] Preferably, one end of the hydraulic male connector communicates with one end of a pipeline. The pipeline is arranged through the mounting cap body, and the other end of the pipeline communicates with a control connector. The control connector is arranged outside the mounting cap body and communicates with the outlet of an external hydraulic pump.

[0021] Preferably, the butt-connecting and communicating structure includes several pairs of matching hydraulic male connectors and hydraulic female connectors.

[0022] Preferably, the distances between several adjacent hydraulic male connectors are inconsistent, and the distances between several adjacent hydraulic female connectors are inconsistent.

[0023] Preferably, the guiding structure further includes a guiding block. The guiding block corresponds to the position of the clamping groove. A guiding groove is arranged outside the clamping groove, and the guiding groove is in clamping fit with the guiding block.

[0024] Preferably, the clamping area of the guiding block is larger than the clamping area of the clamping block.

[0025] Preferably, a protective outer cylinder is connected below the mounting cap body, and the protective outer cylinder is sleeved on the outer wall of the underwater wellbore.

[0026] Preferably, a lifting hanging piece is further arranged above the mounting cap body. The lifting hanging piece includes a hook.

[0027] The technical solution of the present application has at least the following advantages and beneficial effects:

[0028] In the present invention, by arranging the guiding structure, the clamping fit of the clamping blocks with different sizes is used to ensure that the Christmas tree cap can only be lowered and installed in place when the guiding is correct, avoiding installation errors caused by the influence of underwater visibility and resulting in the failure of the subsequent sealing and connecting function.

[0029] In the present invention, by arranging the quick hydraulic connector, the inside of the underwater wellbore sealed by the tubing hanger can be automatically connected when installed in place, and stable operation can be carried out on the underwater wellbore while maintaining the seal.

[0030] In the present invention, by arranging the crank rotation locking mechanism, the installed underwater Christmas tree cap can be quickly locked, ensuring the convenience and accuracy of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a front view structural schematic diagram of the present invention.

[0032] Figure 2 It is a structural schematic diagram of the mounting cap body in the present invention.

[0033] Figure 3 It is a partial structural schematic diagram of the present invention.

[0034] Figure 4This is a schematic structural diagram of the guide cylinder and the guide structure in the present invention.

[0035] Figure 5 This is a schematic bottom view structural diagram of the guide structure in the present invention.

[0036] Figure 6 This is a schematic top view structural diagram of the tubing hanger in the present invention.

[0037] Figure 7 This is a schematic structural diagram of the docking and connecting structure before docking in the present invention.

[0038] Figure 8 This is a schematic structural diagram of the docking and connecting structure after docking in the present invention.

[0039] Figure 9 This is a schematic cross-sectional structural diagram of the present invention.

[0040] Figure 10 This is a schematic cross-sectional structural diagram of the crankshaft rotation locking structure in the present invention when it is locked.

[0041] In the figure: 1 - mounting cap body, 101 - cover plate, 102 - mounting cylinder, 103 - locking screw, 2 - protective outer cylinder, 3 - crankshaft rotation locking structure, 301 - fixed block, 302 - locking block, 303 - crankshaft, 304 - convex block, 305 - clamping plate, 306 - clamping seat, 4 - guide cylinder, 5 - guide structure, 501 - connecting plate, 502 - guide block, 503 - first clamping block, 504 - second clamping block, 505 - clamping groove, 506 - bolt member, 6 - docking and connecting structure, 601 - hydraulic male connector, 602 - hydraulic female connector, 603 - inserting rod, 604 - hydraulic port, 7 - control connector, 8 - pipeline, 9 - lifting hanging part, 901 - hanging plate, 902 - hanging hook, 10 - tubing hanger, 11 - underwater wellbore. Detailed implementation manners

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying 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 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 shall fall within the protection scope of the present invention.

[0043] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. If terms such as "center", "upper", "lower", "inner", "outer", etc. indicate orientation or positional relationships, they are based on the orientation or positional relationships shown in the drawings, or the orientation or positional relationships in which the product of this application is customarily placed during use. This is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to this application. It should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "install", "connect" are understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] Embodiment

[0045] Please refer to Figures 1 - 10 , the present invention provides an underwater quick-connect and lock oil production tree cap, including an installation cap body 1, a protective outer cylinder 2, a crankshaft rotation locking structure 3, a guide cylinder 4, a guiding structure 5, a butt joint and communication structure 6, a control plug 7, a pipeline 8, a lifting hanging part 9, a tubing hanger 10, and an underwater wellbore 11.

[0046] Furthermore, the underwater wellbore 11 is located below the water surface. A tubing hanger 10 is fixedly installed inside the underwater wellbore 11. The tubing hanger 10 blocks the inside of the underwater wellbore 11 and is used for supporting and sealing the inside of the underwater wellbore 11. An installation cap body 1 is sleeved at the wellhead of the underwater wellbore 11. The installation cap body 1 includes a cover plate 101, an installation cylinder 102, and locking screws 103.

[0047] The cover plate 101 covers the entire wellhead, preventing external water flow and water pressure from continuing to act on the inside of the underwater wellbore 11 and exerting excessive water pressure on the tubing hanger 10, which may affect its operation. The installation cylinder 102 is fixedly connected to the lower part of the cover plate 101 through locking screws 103. The crankshaft rotation locking structures 3 are symmetrically arranged on both sides of the installation cylinder 102. The locking ends of the crankshaft rotation locking structures 3 are clamped with the outer wall of the underwater wellbore 11 and are used to fix the entire installation cap body 1 on the underwater wellbore 11.

[0048] Furthermore, the protective outer cylinder 2 is fixedly connected to the lower part of the installation cylinder 102. The protective outer cylinder 2 is sleeved on the outer wall of the underwater wellbore 11. It can provide guidance during the connection and locking process of the oil production tree cap and protect the underwater wellbore 11 to avoid damaging the underwater wellbore 11.

[0049] Furthermore, a lifting hanging part 9 is also arranged above the cover plate 101. The lifting hanging part 9 includes a hanging plate 901 and a hanging hook 902. The hanging plate 901 is fixedly installed on the cover plate 101, and the hanging hook 902 is fixedly connected below the hanging plate 901. The hanging plate 901 and the hanging hook 902 are used to connect with an external hoist, so as to drive the entire Christmas tree cap to move downward and guide it into the underwater wellbore 11 for locking connection.

[0050] Furthermore, a guiding cylinder 4 is coaxially and fixedly connected below the installation cylinder 102. A guiding structure 5 is installed below the guiding cylinder 4. The guiding length of the guiding cylinder 4 is such that the guiding structure 5 is located at the lower end of the protective outer cylinder 2. When the protective outer cylinder 2 is initially guided on the underwater wellbore 11, the guiding structure 5 enters the interior of the underwater wellbore 11 for further guiding. The guiding structure 5 is located between the tubing hanger 10 and the installation cap body 1 in the underwater wellbore 11, and moves downward along with the installation cap body 1 to approach the tubing hanger 10 until it is guided and matched with the tubing hanger 10 for connection.

[0051] Please refer to Figures 3 - 6 , in this embodiment, the guiding structure 5 includes a connecting plate 501, a guiding block 502, a first clamping block 503, a second clamping block 504, and a clamping groove 505.

[0052] A connecting plate 501 is fixedly arranged at the bottom end of the guiding cylinder 4, and at least one guiding block 502 is fixedly installed on the bottom surface of the connecting plate 501.

[0053] The first clamping block 503 and the second clamping block 504 are also locked and installed on the bottom surface of the connecting plate 501 through a bolt member 506. The first clamping block 503 and the second clamping block 504 are symmetrically arranged on both sides of the axis of the guiding cylinder 4.

[0054] The clamping groove 505 is arranged on the upper surface of the tubing hanger 10. The clamping groove 505 includes a guiding groove for the guiding block 502 to be clamped and a clamping groove for the clamping block to be matched.

[0055] Among them, the sizes of the first clamping block 503 and the second clamping block 504 are inconsistent, and the clamping area of the first clamping block 503 is larger than that of the second clamping block 504.

[0056] Preferably, when the guiding block 502 moves downward, the guiding block 502 is preferentially slidably clamped with the guiding groove to limit the entire downward-moving Christmas tree cap and prevent it from rotating. After the guiding block 502 is slidably clamped with the guiding groove, the first clamping block 503 and the second clamping block 504 will be clamped and matched with the clamping groove. The different sizes of the first clamping block 503 and the second clamping block 504 can avoid misalignment, prevent the installation and locking positions from being opposite, and ensure that the subsequent docking and connecting structure 6 can perform the docking work.

[0057] Furthermore, a docking communication structure 6 is provided between the tubing hanger 10 and the guide cylinder 4; after docking with the tubing hanger 10, the docking communication structure 6 can connect the underwater wellway 11 space sealed by the tubing hanger 10 with the outside, so as to facilitate other underwater work.

[0058] Please refer to Figures 4 - 8 In this embodiment, the docking connection structure 6 includes a hydraulic male plug connector 601 , a hydraulic female plug connector 602 , an insertion rod 603 , and a hydraulic port 604 .

[0059] Specifically, the hydraulic male connector 601 is fixedly installed on the connecting plate 501 , and the hydraulic female connector 602 is fixedly installed on the tubing hanger 10 . Hydraulic pipelines are passed through the hydraulic male connector 601 and the hydraulic female connector 602 .

[0060] The top of the hydraulic male connector 601 is connected to one end of the pipeline 8, which is installed on the mounting cap body 1. The other end of the pipeline 8 is connected to the control connector 7, so that the hydraulic pipeline is connected to the control connector 7. The control connector 7 is threadedly locked on the sheet metal and fixed to the cover plate 101 through the sheet metal. The control connector 7 is connected to the external hydraulic pump outlet, and the fluid medium is pumped into the hydraulic pipeline of the hydraulic male connector 601 through the hydraulic pump.

[0061] A plug rod 603 is fixedly provided below the hydraulic male plug connector 601. A hydraulic pipeline runs through the plug rod 603 and is connected to the hydraulic pipeline of the hydraulic male plug connector 601. A one-way valve is provided in the hydraulic pipeline of the hydraulic female plug connector 602. A hydraulic port 604 is provided below the hydraulic female plug connector 602, and the hydraulic port 604 is connected to the hydraulic pipeline.

[0062] Preferably, when the entire oil production tree cap moves downward, the hydraulic male connector 601 will move downward and be plugged into and matched with the hydraulic female connector 602. At this time, the plug rod 603 will be vertically inserted into the hydraulic pipeline of the hydraulic female connector 602 and pass through the one-way valve to push open the valve of the one-way valve, so that the hydraulic pipelines inside the hydraulic male connector 601 and the hydraulic female connector 602 are connected, and the hydraulic port 604 below the hydraulic female connector 602 is passed through the space of the underwater wellway 11 below the oil tubing hanger 10, so that the fluid medium in the hydraulic pipeline of the hydraulic male connector 601 is pumped into the space of the underwater wellway 11, and the corresponding underwater wellway 11 work is performed.

[0063] In addition, the docking and connecting structure 6 includes a number of pairs of matching hydraulic male connectors 601 and hydraulic female connectors 602. The spacing between adjacent hydraulic male connectors 601 (hydraulic female connectors 602) is inconsistent, which is used to perform corresponding pumping operations at different positions of the underwater wellbore 11. When the blocks of different sizes are used for limiting, it can ensure that the hydraulic male connectors 601 and hydraulic female connectors 602 at different positions can be aligned and matched.

[0064] In some embodiments, the crankshaft rotation locking structure 3 can be designed as a snap structure in the prior art. The snap structure includes a positioning end and a fastening end. The positioning end is fixed on the mounting cap body 1, and the fastening end is fixed on the outer wall of the underwater wellbore 11, and the two are locked and clamped together.

[0065] Please refer to Figures 9 - 10 , in this embodiment, the crankshaft rotation locking structure 3 specifically includes a fixed block 301, a locking block 302, a crankshaft 303, a convex block 304, a clamping plate 305, and a clamping seat 306.

[0066] Specifically, the fixed block 301 is fixed on the outer wall of the mounting cylinder 102. The locking block 302 is slidably penetrated through the fixed block 301. The locking block 302 penetrates through the mounting cylinder 102. The sliding direction of the locking block 302 is perpendicular to the axial direction of the underwater wellbore 11, so that one end of the locking block 302 abuts against the outer wall of the underwater wellbore 11 inside the mounting cylinder 102 and is clamped with the protrusion on the outer wall of the underwater wellbore 11 to perform the locking function.

[0067] The crankshaft 303 is rotatably connected to the fixed block 301. The crankshaft 303 penetrates through the locking block 302. The convex block 304 is fixedly arranged on the crankshaft 303. The convex block 304 is located between the crankshaft 303 and the locking block 302 and slidably abuts against the locking block 302. The crankshaft 303 does not contact the locking block 302 during the rotation process. Therefore, when the crankshaft 303 rotates, the convex block 304 rotates together. By using the protruding position of the convex block 304 that is not coaxial with the crankshaft 303 during rotation, a thrust is applied to the locking block 302, thereby driving the locking block 302 to slide and be clamped with the outer wall of the underwater wellbore 11.

[0068] A clamping plate 305 is rotatably connected to the crankshaft 303. When the crankshaft 303 rotates, the clamping plate 305 swings along with the crankshaft 303. The clamping plate 305 can also slide on the crankshaft 303, and a positioning hole penetrates through the clamping plate 305. When the crankshaft rotation locking structure 3 locks the outer wall of the underwater wellbore 11, the crankshaft 303 drives the clamping plate 305 to swing to the position of the clamping seat 306, and the clamping seat 306 is fixed on the side surface of the mounting cap body 1 and is located on one side of the rotation direction of the crankshaft 303. When the positions of the clamping plate 305 and the clamping seat 306 correspond, the positioning hole on the clamping plate 305 can be sleeved and matched with the positioning column fixedly arranged on the clamping seat 306, so as to limit the swing of the crankshaft 303 by using the clamping plate 305 and ensure that the locking block 302 is locked and does not slide any more. When unlocking is required, slide the clamping plate 305 so that the positioning hole on the clamping plate 305 is disengaged from the positioning column on the clamping seat 306.

[0069] So far, the embodiments of the present invention have been described in detail. In order to avoid obscuring the concept of the present invention, some details well known in the art have not been described. Those skilled in the art can clearly understand how to implement the technical solutions of the present invention according to the above description. The scope of the present invention is defined by the appended claims.

Claims

1. An underwater quick-connect and locking Christmas tree cap, comprising an installation cap body (1), the installation cap body (1) is arranged at the wellhead end of an underwater wellbore (11), a tubing hanger (10) is fixedly installed in the underwater wellbore (11), and a sealed space is formed between the lower part of the tubing hanger (10) and the interior of the underwater wellbore (11). It is characterized by: A guide structure (5) is installed below the installation cap body (1), and the guide structure (5) is located between the oil pipe hanger (10) in the underwater well (11) and the installation cap body (1); A butt connection structure (6) is also provided between the tubing hanger (10) and the mounting cap body (1); The docking connection structure (6) comprises a hydraulic male plug connector (601) and a hydraulic female plug connector (602), wherein the hydraulic male plug connector (601) is arranged on the upper part of the tubing hanger (10), and the hydraulic female plug connector (602) is passed through the upper and lower parts of the tubing hanger (10); Hydraulic pipelines are passed through the interiors of the hydraulic male plug connector (601) and the hydraulic female plug connector (602). When the two are matched and plugged in, the hydraulic pipelines inside the hydraulic male plug connector (601) and the hydraulic female plug connector (602) are connected.

2. An underwater quick-connect and locking christmas tree cap according to claim 1, characterized in that, The guide structure (5) comprises a clamping block and a clamping slot (505), wherein the clamping block is arranged below the mounting cap body (1), and the clamping slot (505) is arranged above the oil pipe hanger (10), and the clamping block and the clamping slot (505) are matched and clamped.

3. An underwater quick-connect and locking Christmas tree cap according to claim 1, characterized in that, Crankshaft rotation locking structures (3) are symmetrically provided on both sides of the mounting cap body (1), and the locking ends of the crankshaft rotation locking structures (3) are clamped and locked with the outer wall of the underwater well (11).

4. An underwater quick-connect and locking production tree cap according to claim 1, characterized in that, Clamping blocks are symmetrically arranged on both sides below the mounting cap body (1), and the clamping blocks on both sides are respectively arranged as clamping block one (503) and clamping block two (504); The clamping area of the first clamping block (503) is larger than the clamping area of the second clamping block (504).

5. An underwater quick-connect and locking Christmas tree cap according to claim 1, characterized in that, A plug rod (603) is provided below the hydraulic male plug connector (601), and the plug rod (603) is vertically slidably inserted into the hydraulic pipeline of the hydraulic female plug connector (602); A hydraulic pipeline is passed through the plug rod (603) and is connected to the hydraulic pipeline of the hydraulic male plug connector (601). A one-way valve is provided in the hydraulic pipeline of the hydraulic female plug connector (602). A hydraulic port (604) is provided below the hydraulic female plug connector (602), and the hydraulic port (604) is connected to the hydraulic pipeline. When the hydraulic male plug connector (601) and the hydraulic female plug connector (602) are plugged and matched, the plug rod (603) passes through the one-way valve, the one-way valve opens, and the flow direction in the one-way valve is from the hydraulic male plug connector (601) to the hydraulic female plug connector (602).

6. The underwater quick-connect and locking Christmas tree cap according to claim 5, characterized in that, One end of the hydraulic male plug connector (601) is connected to one end of a pipeline (8), which is passed through the mounting cap body (1); the other end of the pipeline (8) is connected to a control plug connector (7), which is arranged outside the mounting cap body (1) and is connected to an external hydraulic pump outlet.

7. An underwater quick-connect and locking Christmas tree cap according to claim 1, characterized in that, The docking connection structure (6) includes a plurality of pairs of matching hydraulic male plug connectors (601) and hydraulic female plug connectors (602); The spacings between adjacent hydraulic male plug connectors (601) are inconsistent, and the spacings between adjacent hydraulic female plug connectors (602) are inconsistent.

8. An underwater quick-connect and locking Christmas tree cap according to claim 1, characterized in that, The guide structure (5) further comprises a guide block (502), the guide block (502) corresponds to the position of the card slot (505), a guide groove is provided outside the card slot (505), and the guide groove is engaged and matched with the guide block (502); The clamping area of the guiding block (502) is larger than that of the clamping block.

9. The underwater quick-connect and locking Christmas tree cap according to claim 1, characterized in that, A protective outer cylinder (2) is connected below the mounting cap body (1), and the protective outer cylinder (2) is sleeved on the outer wall of the underwater wellbore (11).

10. An underwater quick-connect and locking oil production tree cap according to claim 1, characterized in that, A lifting hanging part (9) is further arranged above the mounting cap body (1), and the lifting hanging part (9) includes a hook (902).

Images