Underwater quick connect locking Christmas tree cap

Abstract

The present application relates to the technical field of underwater Christmas tree equipment, and particularly relates to a kind of underwater quick connection locking Christmas tree cap, which comprises a mounting cap body, the mounting cap body is arranged at the wellhead end of underwater well channel, a tubing hanger is installed in the underwater well channel, the tubing hanger and the inside of the underwater well channel form a sealed space, a guide structure is located between the tubing hanger and the mounting cap body in the underwater well channel, and installation guidance is carried out;A butt joint communication structure is arranged between the tubing hanger and the mounting cap body;The butt joint communication structure comprises a hydraulic male connector, the hydraulic male connector is arranged on the upper part of the tubing hanger, and a hydraulic female connector is arranged through the upper and lower parts of the tubing hanger;Hydraulic pipes are penetrated in the hydraulic male connector and the hydraulic female connector, which are used for fluid conveying work in the sealed space.The present application solves the technical problems of underwater Christmas tree cap quick connection guide locking, quick connection of sealed well channel and stable operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underwater Christmas tree equipment, in particular to a kind of underwater quick connection locking Christmas tree cap. BACKGROUND

[0002] Underwater Christmas tree is one of the core equipment of offshore oil and gas development, for connecting the oil and gas in deep strata and external transportation pipeline, controlling the speed of oil and gas exploitation, and real-time monitoring and adjusting production situation. And underwater Christmas tree cap is used to connect and lock with underwater Christmas tree body, provide underwater connection of production channel and cable crossing channel, quickly connect the tubing hanger of underwater wellbore, the tubing hanger is used to support the tubing string and seal the key device between underwater wellbore and casing, ensure the smooth production of oil and gas and the safety of downhole operation.

[0003] In underwater oil and gas exploitation, after underwater wellbore installation is completed, Christmas tree cap needs to be installed. Because underwater wellhead is in seawater with extremely complex environmental conditions, waves surge, and visibility is low, additional complex and delicate operations cannot be carried out underwater, a tree cap device for underwater wellhead is needed, which can quickly guide and butt joint and quickly lock and install, to provide a safe and stable underwater operation environment.

[0004] The present application discloses a kind of underwater Christmas tree cap mechanical quick locking device, including shell, hoisting mechanism on shell and at least one set of locking assembly on the side of shell;Locking assembly includes locking rod and card tooth, locking hole is arranged on the side of shell, and locking hole is axially adapted with locking rod;Card tooth is connected to one end of locking rod close to the inside of shell and moves along its axial direction, and moves to shell and clamps or separates on the profile of Christmas tree cap. The present application can reduce the working strength of hoisting operation by mechanical structure quick locking, and increase safety factor.

[0005] Although the device can quickly lock underwater Christmas tree cap on underwater wellbore, it cannot continue to seal the inside of locked underwater wellbore and connect for underwater stable operation in sealed state. SUMMARY

[0006] The purpose of the present application is to provide a kind of underwater quick connection locking Christmas tree cap, which solves the technical problems of quick connection guiding and locking of underwater Christmas tree cap, quick connection sealing wellbore and stable operation.

[0007] In order to solve the above technical problems, the scheme adopted by the present application is as follows:

[0008] The application discloses a quick connection locking Christmas tree cap under water, which comprises a mounting cap body, the mounting cap body is arranged at the well mouth end of an underwater well channel, a tubing hanger is fixedly arranged in the underwater well channel, and a sealing space is formed between the lower part of the tubing hanger and the inner part of the underwater well channel.

[0009] Preferably, a guide structure is arranged below the mounting cap body, and the guide structure is located between the tubing hanger and the mounting cap body in the underwater well channel.

[0010] Preferably, a butt joint communication structure is further arranged between the tubing hanger and the mounting cap body.

[0011] Preferably, the butt joint communication structure comprises a hydraulic male connector and a hydraulic female connector, the hydraulic male connector is arranged on the upper part of the tubing hanger, and the hydraulic female connector is arranged through the upper and lower parts of the tubing hanger.

[0012] Preferably, hydraulic pipelines are arranged through the hydraulic male connector and the hydraulic female connector, and the hydraulic pipelines in the hydraulic male connector and the hydraulic female connector are communicated when the hydraulic male connector and the hydraulic female connector are matched and connected.

[0013] Preferably, the guide structure comprises a clamping block and a clamping groove, the clamping block is arranged below the mounting cap body, the clamping groove is arranged above the tubing hanger, and the clamping block is matched and connected with the clamping groove.

[0014] Preferably, crank rotating locking structures are symmetrically arranged on both sides of the mounting cap body, and the locking ends of the crank rotating locking structures are matched and locked with the outer wall of the underwater well channel.

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

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

[0017] Preferably, a plug rod is arranged below the hydraulic male connector, and the plug rod is vertically and slidingly arranged in the hydraulic pipeline of the hydraulic female connector.

[0018] Preferably, a hydraulic pipeline is arranged through the plug rod and is communicated with the hydraulic pipeline of the hydraulic male connector, a one-way valve is arranged in the hydraulic pipeline of the hydraulic female connector, a hydraulic port is arranged below the hydraulic female connector, and the hydraulic port is communicated with the hydraulic pipeline.

[0019] Preferably, when the hydraulic male connector and the hydraulic female connector are matched and connected, the plug rod passes through the one-way valve, the one-way valve is opened, and the flow direction in the one-way valve is from the hydraulic male connector to the hydraulic female connector.

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

[0021] Preferably, the docking communication structure comprises a plurality of matched hydraulic male connectors and hydraulic female connectors.

[0022] Preferably, the spacing between adjacent hydraulic male connectors is inconsistent, and the spacing between adjacent hydraulic female connectors is inconsistent.

[0023] Preferably, the guide structure further comprises a guide block, the guide block is matched with the clamping groove, and a guide groove is arranged outside the clamping groove and matched with the guide block.

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

[0025] Preferably, the installation cap body is connected with a protective outer cylinder below, and the protective outer cylinder is arranged on the outer wall of the underwater shaft.

[0026] Preferably, the installation cap body is further provided with a lifting hanging piece above, and the lifting hanging piece comprises a hook.

[0027] The technical scheme has at least the following advantages and beneficial effects:

[0028] In the application, the guide structure is arranged, the clamping matching of clamping blocks with different sizes is utilized to ensure that the Christmas tree cap can only be installed in place when the guide is correct, and the installation error caused by the influence of underwater visibility is avoided, and the subsequent sealing connection function failure is caused;

[0029] In the application, the quick hydraulic connector is arranged, the underwater shaft inside sealed by the tubing hanger can be automatically connected when installed in place, and the underwater shaft is stably operated under the condition of maintaining the sealing;

[0030] In the application, the crankshaft rotation locking mechanism is arranged to quickly lock the underwater Christmas tree cap installed in place, and the convenience and accuracy of operation are ensured. BRIEF DESCRIPTION OF DRAWINGS

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

[0032] Figure 2 It is a structural schematic diagram of the installation cap body in the application.

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

[0034] Figure 4Structure diagram of guide cylinder and guide structure in the application.

[0035] Figure 5 Structure diagram of guide structure in the application.

[0036] Figure 6 Structure diagram of oil pipe hanger in the application.

[0037] Figure 7 Structure diagram of butt joint communication structure when not butt joint in the application.

[0038] Figure 8 Structure diagram of butt joint communication structure when butt joint in the application.

[0039] Figure 9 Structure diagram of the application.

[0040] Figure 10 Structure diagram of crankshaft rotation locking structure when locked in the application.

[0041] In the figure: 1 - installation cap body, 101 - cover plate, 102 - installation cylinder, 103 - locking screw, 2 - protective outer cylinder, 3 - crankshaft rotation locking structure, 301 - fixed block, 302 - lock block, 303 - crankshaft, 304 - protruding block, 305 - clamping plate, 306 - clamping seat, 4 - guide cylinder, 5 - guide structure, 501 - connecting plate, 502 - guide block, 503 - clamping block one, 504 - clamping block two, 505 - clamping groove, 506 - bolt piece, 6 - butt joint communication structure, 601 - hydraulic male plug connector, 602 - hydraulic female plug connector, 603 - plug rod, 604 - hydraulic port, 7 - control plug connector, 8 - pipeline, 9 - lifting hanging piece, 901 - hanging plate, 902 - hook, 10 - oil pipe hanger, 11 - underwater shaft. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0043] It should be noted that similar reference numerals and letters refer to like items in the accompanying drawings, and once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings. The terms "center", "upper", "lower", "inner", "outer", and the like, which indicate the positional or spatial relationships based on the orientations or positions shown in the drawings or the orientations or positions in which the products of the present application are usually placed, are merely used for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. It should also be noted that, unless otherwise explicitly specified and limited, the terms "provided", "mounted", "connected" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium; and can be connected internally between two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances. Embodiments

[0044] Please refer to Figures 1-10 The present application provides a kind of underwater quick connection locking Christmas tree cap, package installation cap 1, protective outer cylinder 2, crank rotating locking structure 3, guide cylinder 4, guide structure 5, butt joint communication structure 6, control plug 7, pipeline 8, lifting hanger 9, tubing hanger 10, underwater well 11.

[0045] Further, underwater well 11 is located below water surface, tubing hanger 10 is fixedly installed in underwater well 11, tubing hanger 10 blocks the inside of underwater well 11, for supporting and sealing the inside of underwater well 11, installation cap 1 is sleeved at the well mouth of underwater well 11, installation cap 1 includes cover plate 101, installation cylinder 102, locking screw 103.

[0046] Cover plate 101 covers the entire well mouth, avoids external water flow water pressure to continue to act on the inside of underwater well 11, applies excessive water pressure to tubing hanger 10, affects its work; cover plate 101 is fixedly connected with installation cylinder 102 below through locking screw 103, installation cylinder 102 is symmetrically provided with crank rotating locking structure 3 on both sides, the locking end of crank rotating locking structure 3 is connected with the outer wall of underwater well 11, for fixing entire installation cap 1 on underwater well 11.

[0047] Further, installation cylinder 102 is fixedly connected with protective outer cylinder 2 below, protective outer cylinder 2 is sleeved on the outer wall of underwater well 11, can provide guidance during the process of connecting and locking Christmas tree cap, and protect underwater well 11, avoid damaging underwater well 11.

[0048] Further, the upper side of the cover plate 101 is provided with a lifting hanger 9, which comprises a hanging plate 901 and a hook 902; the hanging plate 901 is fixedly installed on the cover plate 101, and the lower side of the hanging plate 901 is fixedly connected with the hook 902; the hanging plate 901 and the hook 902 are used to be connected with an external lifting machine, so as to drive the entire Christmas tree cap to move downward and guide into the underwater well channel 11 for locking connection.

[0049] Further, the lower side of the mounting cylinder 102 is coaxially fixedly connected with a guide cylinder 4, the lower side of the guide cylinder 4 is provided with a guide structure 5, and the guide length of the guide cylinder 4 is such that the guide structure 5 is located at the lower end of the protective outer cylinder 2, so that when the protective outer cylinder 2 is initially guided on the underwater well channel 11, the guide structure 5 enters the inside of the underwater well channel 11 for further guiding; the guide structure 5 is located between the tubing hanger 10 and the mounting cap body 1 in the underwater well channel 11, and follows the mounting cap body 1 to move downward to approach the tubing hanger 10 until the tubing hanger 10 is guided and matched.

[0050] Please refer to Figures 3-6 In the embodiment, the guide structure 5 comprises a connecting plate 501, a guide block 502, a clamping block one 503, a clamping block two 504, and a clamping groove 505.

[0051] The bottom end of the guide cylinder 4 is fixedly provided with the connecting plate 501, and the bottom surface of the connecting plate 501 is fixedly installed with at least one guide block 502.

[0052] The bottom surface of the connecting plate 501 is also locked and installed with the clamping block one 503 and the clamping block two 504 through a bolt 506, and the clamping block one 503 and the clamping block two 504 are symmetrically arranged on both sides of the axis of the guide cylinder 4.

[0053] The clamping groove 505 is arranged on the upper surface of the tubing hanger 10, and the clamping groove 505 comprises a guide groove for the guide block 502 to be clamped and a clamping groove for the clamping blocks to be matched.

[0054] The clamping block one 503 and the clamping block two 504 are of different sizes, and the clamping area of the clamping block one 503 is larger than that of the clamping block two 504.

[0055] Preferably, when the guide block 502 moves downward, the guide block 502 is preferentially clamped and matched with the guide groove to limit the entire downward-moving Christmas tree cap, so as to avoid rotation thereof; after the guide block 502 is clamped and matched with the guide groove, the clamping block one 503 and the clamping block two 504 are clamped and matched with the clamping groove; and the clamping block one 503 and the clamping block two 504 of different sizes can avoid alignment errors and avoid the installation locking positions being opposite, so as to ensure that the subsequent butt joint communication structure 6 can perform butt joint work.

[0056] Further, the tubing hanger 10 and the guide cylinder 4 are further provided with a docking communication structure 6; the docking communication structure 6 can communicate the underwater well passage 11 space sealed by the tubing hanger 10 with the outside after docking with the tubing hanger 10, so as to facilitate other underwater work.

[0057] Please refer to Figures 4-8 In the embodiment, the docking communication structure 6 includes a hydraulic male connector 601, a hydraulic female connector 602, a plug rod 603, and a hydraulic port 604.

[0058] Specifically, the hydraulic male connector 601 is fixedly arranged on the connecting plate 501, the hydraulic female connector 602 is fixedly arranged on the tubing hanger 10, and the hydraulic male connector 601 and the hydraulic female connector 602 are both internally provided with a hydraulic pipeline.

[0059] The hydraulic male connector 601 is communicated with one end of a pipeline 8 arranged on the installation cap body 1, and the other end of the pipeline 8 is communicated with a control connector 7, so that the hydraulic pipeline is communicated with the control connector 7, the control connector 7 is screwed on the metal plate, and the metal plate is fixed on the cover plate 101, the control connector 7 is communicated with the hydraulic pump outlet outside, and the fluid medium is pumped into the hydraulic pipeline of the hydraulic male connector 601 through the hydraulic pump.

[0060] The plug rod 603 is arranged below the hydraulic male connector 601, the plug rod 603 is internally provided with a hydraulic pipeline and is communicated with the hydraulic pipeline of the hydraulic male connector 601, a one-way valve is arranged in the hydraulic pipeline of the hydraulic female connector 602, and the hydraulic port 604 is arranged below the hydraulic female connector 602 and is communicated with the hydraulic pipeline.

[0061] When the whole Christmas tree cap is lowered, the hydraulic male connector 601 is lowered and matched with the hydraulic female connector 602, at this time, the plug rod 603 is vertically inserted into the hydraulic pipeline of the hydraulic female connector 602 and penetrates through the one-way valve, the valve of the one-way valve is opened, the hydraulic pipeline in the hydraulic male connector 601 and the hydraulic female connector 602 is communicated, the hydraulic port 604 below the hydraulic female connector 602 penetrates into the underwater well passage 11 space below the tubing hanger 10, so that the fluid medium in the hydraulic pipeline of the hydraulic male connector 601 is pumped into the underwater well passage 11 space, and corresponding underwater well passage 11 work is performed.

[0062] In addition, the docking communication structure 6 includes a plurality of matched hydraulic male connectors 601 and hydraulic female connectors 602, the spacing between adjacent hydraulic male connectors 601 (hydraulic female connectors 602) is inconsistent, and the different positions of the underwater shaft 11 are pumped for corresponding work; wherein the different size clamping blocks can ensure that the hydraulic male connectors 601 and the hydraulic female connectors 602 at different positions can be matched.

[0063] In some embodiments, the crankshaft rotation locking structure 3 can be designed as a buckle structure in the prior art, the buckle structure includes a positioning end and a fastening end, the positioning end is fixed on the installation cap 1, and the fastening end is fixed on the outer wall of the underwater shaft 11, and the two are locked and clamped together.

[0064] 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 protruding block 304, a clamping plate 305, and a clamping seat 306.

[0065] Specifically, the fixed block 301 is fixed on the outer wall of the installation cylinder 102, and the locking block 302 is slidably arranged on the fixed block 301 and passes through the installation cylinder 102, the sliding direction of the locking block 302 is perpendicular to the axial direction of the underwater shaft 11, so that one end of the locking block 302 abuts against the outer wall of the underwater shaft 11 in the installation cylinder 102 and is clamped with the protrusion on the outer wall of the underwater shaft 11 to perform the locking function.

[0066] The crankshaft 303 is rotatably connected to the fixed block 301 and passes through the locking block 302, the protruding block 304 is fixedly arranged on the crankshaft 303 and located between the crankshaft 303 and the locking block 302, and the protruding block 304 is in sliding abutment with the locking block 302, and the crankshaft 303 does not contact the locking block 302 during rotation; therefore, when the crankshaft 303 rotates, the protruding block 304 rotates together, and the protruding block 304 applies a pushing force to the locking block 302 by virtue of the protruding position of the protruding block 304 being different from the crankshaft 303 during rotation, thereby driving the locking block 302 to slide and clamp with the outer wall of the underwater shaft 11.

[0067] The crankshaft 303 is rotatably connected with a clamping plate 305, when the crankshaft 303 rotates, the clamping plate 305 swings with the crankshaft 303, the clamping plate 305 can also slide on the crankshaft 303, and the clamping plate 305 is provided with a positioning hole; when the crankshaft rotation locking structure 3 locks the outer wall of the underwater shaft 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 of the mounting cap body 1 and is located on one side in the rotating direction of the crankshaft 303; when the clamping plate 305 and the clamping seat 306 are in position correspondence, the positioning hole on the clamping plate 305 can be matched with the positioning column fixedly arranged on the clamping seat 306, so that the swinging of the crankshaft 303 is limited by the clamping plate 305, and it is ensured that the locking of the locking block 302 no longer slides; when it is necessary to unlock, the clamping plate 305 is slid so that the positioning hole of the clamping plate 305 is separated from the positioning column on the clamping seat 306.

[0068] Thus far, the embodiments of the present application have been described in detail. In order to avoid obscuring the concept of the present application, some details known in the art are not described. Those skilled in the art can fully understand how to implement the technical solutions of the present application according to the above description, and the scope of the present application is defined by the appended claims.

Claims

1. An underwater quick connection locking Christmas tree cap, comprising a mounting cap body (1) arranged at the wellhead end of an underwater well channel (11), a tubing hanger (10) fixedly arranged in the underwater well channel (11), and a sealed space formed between the lower part of the tubing hanger (10) and the interior of the underwater well channel (11), characterized in that: a guide structure (5) is arranged below the mounting cap body (1) and located between the tubing hanger (10) and the mounting cap body (1) in the underwater well channel (11); a butt joint communication structure (6) is further arranged between the tubing hanger (10) and the mounting cap body (1); the butt joint communication structure (6) comprises a hydraulic male plug connector (601) arranged on the upper part of the tubing hanger (10) and a hydraulic female plug connector (602) arranged through the upper and lower parts of the tubing hanger (10); hydraulic pipelines are arranged through the interiors of the hydraulic male plug connector (601) and the hydraulic female plug connector (602) and are in communication with each other when the two are matched and plugged; the guide structure (5) comprises a clamping block arranged below the mounting cap body (1) and a clamping groove (505) arranged above the tubing hanger (10), and the clamping block is matched and clamped with the clamping groove (505); crankshaft rotary locking structures (3) are symmetrically arranged on both sides of the mounting cap body (1), and the locking ends of the crankshaft rotary locking structures (3) are clamped and locked with the outer wall of the underwater well channel (11); clamping blocks are symmetrically arranged below the mounting cap body (1), and the clamping blocks on both sides are respectively a clamping block one (503) and a clamping block two (504); the clamping area of the clamping block one (503) is larger than that of the clamping block two (504); a plug rod (603) is arranged below the hydraulic male plug connector (601) and vertically slidably arranged in the hydraulic pipeline of the hydraulic female plug connector (602); a hydraulic pipeline is arranged through the plug rod (603) and is in communication with the hydraulic pipelines of the hydraulic male plug connector (601) and the hydraulic female plug connector (602); a one-way valve is arranged in the hydraulic pipeline of the hydraulic female plug connector (602), a hydraulic port (604) is arranged below the hydraulic female plug connector (602), and the hydraulic port (604) is in communication with 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 is opened, and the flow direction in the valve of the one-way valve is from the hydraulic male plug connector (601) to the hydraulic female plug connector (602); one end of the hydraulic male plug connector (601) is in communication with one end of a pipeline (8) arranged through the mounting cap body (1), and the other end of the pipeline (8) is in communication with a control plug connector (7) arranged outside the mounting cap body (1) and in communication with the outlet of an external hydraulic pump; the butt joint communication structure (6) comprises a plurality of matched hydraulic male plug connectors (601) and hydraulic female plug connectors (602). ​ ​ ​ ​ ​ ​ ​ ​ 2. The quick connect locking Christmas tree cap for subsea use according to claim 1, characterized in that, ​ ​ ​ 3. The quick connect locking Christmas tree cap for subsea use according to claim 2, characterized in that, ​ 4. The quick connect locking Christmas tree cap for subsea use of claim 1, wherein, ​ The interval between adjacent hydraulic male connectors (601) is inconsistent, and the interval between adjacent hydraulic female connectors (602) is inconsistent.

5. The quick connect locking Christmas tree cap for subsea use of claim 1, wherein, The guide structure (5) further comprises a guide block (502) corresponding to the clamping groove (505), and a guide groove is arranged outside the clamping groove (505) and matched with the guide block (502). The clamping area of the guide block (502) is larger than that of the clamping block.

6. The quick connect locking Christmas tree cap for subsea use of claim 1, wherein, The lower portion of the mounting cap body (1) is connected with a protective outer cylinder (2), and the protective outer cylinder (2) is sleeved on the outer wall of the underwater shaft (11).

7. The quick connect locking Christmas tree cap for subsea use of claim 1, wherein, The upper portion of the mounting cap body (1) is further provided with a lifting hanging piece (9), and the lifting hanging piece (9) comprises a hook (902).

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