Christmas tree cap

Abstract

The Christmas tree cap comprises a connector, a locking mechanism and a locking mechanism, the locking mechanism comprises a locking block annularly arranged on the periphery of a Christmas tree body, and when the locking block is located at a first position, the locking block applies extrusion force pointing to the axis direction of the Christmas tree body to the Christmas tree body; the Christmas tree body generates elastic deformation to extrude the connector; the locking mechanism comprises a locking rod detachably connected with the locking block, and a locking assembly is connected between the locking rod and the connector. Extrusion force pointing to the axis direction of the Christmas tree body is applied to the Christmas tree body through the locking block, the Christmas tree body generates elastic deformation to extrude the connector, and therefore the friction force between the Christmas tree body and the connector is increased, and the Christmas tree body is locked; the position of the locking rod relative to the connector is controlled through the locking assembly, so that the position of the locking block is locked, the locking block is prevented from being loosened due to large seabed pressure and pressure change, and secondary locking of the Christmas tree body is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of Christmas tree caps, and in particular relates to a Christmas tree cap. Background Art

[0002] Marine underwater oil and gas production system equipment is a high-end marine engineering equipment with high technology, high reliability and high added value. Currently, there is a lack of design experience in underwater oil tree caps. The existing products are shallow water underwater oil tree caps. Since the pressure in deep water areas is much greater than that in shallow water areas, the pressure changes greatly, which can easily lead to the loosening of existing locking devices. The locking effect is not ideal and cannot meet the requirements of deepwater high-pressure working conditions. Summary of the invention

[0003] The object of the present invention is to provide a Christmas tree cap to solve the problems existing in the above-mentioned prior art.

[0004] To achieve the above-mentioned purpose, the present invention provides a Christmas tree cap, comprising a connector, a locking mechanism and a locking mechanism, wherein a sealed cavity with a one-way opening is arranged inside the connector, a Christmas tree body is sleeved on the outside of the opening end of the connector, and the sealed cavity is communicated with an internal channel of the Christmas tree.

[0005] The locking mechanism includes a locking block arranged circumferentially on the periphery of the Christmas tree body, and the locking block is connected to a driving assembly for driving the locking block to move; the locking block includes a first position and a second position, and the locking block switches between the first position and the second position based on the driving assembly driving the locking block to move. When the locking block is in the first position, the locking block applies a squeezing force to the Christmas tree body in the direction of the axis of the Christmas tree body, and the Christmas tree body generates elastic deformation to squeeze the connector; when the locking block is in the second position, the locking block and the Christmas tree body are arranged at intervals.

[0006] The locking mechanism comprises a locking rod detachably connected to the locking block, a locking assembly is connected between the locking rod and the connector, and the locking assembly is used to control the position of the locking rod relative to the connector.

[0007] Optionally, the locking assembly includes a locking bushing, a locking block and a mounting seat; the locking bushing is sleeved on the outside of the locking rod, and the locking bushing is detachably connected to the connector; the locking block is sleeved on the outside of the locking bushing, and the locking block is connected to a second driving element, and the second driving element drives the locking block to slide along the axial direction of the locking bushing; the mounting seat is detachably connected to the connector, a locking cavity is defined inside the mounting seat, and the locking block is arranged in the locking cavity, and the opposing surfaces of the locking block and the mounting seat are respectively a first abutting surface and a second abutting surface, and the distance from the first abutting surface to the locking bushing and the distance from the second abutting surface to the locking bushing both gradually decrease from one end of the locking bushing to the other end.

[0008] Optionally, the second driving element includes a driving seat, a locking piston and a locking spring, the driving seat being sleeved on the outside of the locking bushing, the driving seat being detachably connected to the mounting seat, and a sliding cavity arranged along the locking rod is opened in the mounting seat; the locking piston is sleeved on the outside of the locking bushing, and the locking piston is slidably arranged in the sliding cavity, an unlocking cavity is formed between the side of the locking piston away from the mounting seat and the driving seat, the side of the locking piston close to the mounting seat is detachably connected to the locking block, and the unlocking cavity is connected to a control oil circuit.

[0009] One end of the locking spring is detachably connected to the locking block, and the end of the locking spring facing away from the locking block is detachably connected to the connector. Based on the elastic force of the locking spring, the locking block applies an extrusion force to the locking bushing in the axial direction of the locking bushing, and the locking bushing generates elastic deformation to squeeze the locking rod.

[0010] Optionally, the locking mechanism further comprises a slip, and the connector, the Christmas tree body and the slip are arranged in sequence from the inside to the outside; the locking block is arranged on the radially outer side of the slip in a circumferential direction; when the locking block is in a first position, the locking block applies an extrusion force to the slip in the direction of the axis of the Christmas tree body; when the locking block is in a second position, the locking block and the slip are arranged at intervals.

[0011] Optionally, the connector is provided with a first annular sliding cavity and a second annular sliding cavity in sequence on the radial outer side of the Christmas tree body, and the first annular sliding cavity and the second annular sliding cavity are coaxially arranged with the Christmas tree body; the driving assembly includes a driving piston, and the driving piston is detachably connected to the locking block, the locking block is slidably arranged in the first annular sliding cavity, and the driving piston is slidably arranged in the second annular sliding cavity; the driving piston is driven to slide in the second annular sliding cavity by the first driving element.

[0012] Optionally, the first driving element is a hydraulic driving component, and the second annular sliding cavity is respectively provided with a first sealing cavity and a second sealing cavity at both ends of the driving piston, and the first sealing cavity and the second sealing cavity are connected with a control oil circuit.

[0013] Optionally, the connector includes a first cover plate, a second cover plate and a shell, the first cover plate and the second cover plate are arranged relatively spaced apart and detachably connected, the first annular sliding cavity is arranged between the first cover plate and the second cover plate, the shell is detachably connected to the circumferential outer side of the cylinder formed by the first cover plate and the second cover plate, and the second annular sliding cavity is arranged between the shell and the cylinder.

[0014] Optionally, the end of the second cover plate facing away from the first cover plate is detachably connected to a frame, and the second cover plate and the frame are correspondingly provided with an accommodating cavity for accommodating the oil production tree body, the first cover plate is detachably connected to a cover plate sleeve in the accommodating cavity, the one-way opening sealing cavity is the inner cavity of the cover plate sleeve, the oil production tree body is sleeved on the outer side of the open end of the cover plate sleeve, and the slips are arranged radially outside the cover plate sleeve.

[0015] Optionally, an indication through hole is provided on the first cover plate, an indication rod is inserted into the indication through hole, one end of the indication rod extends into the accommodating cavity and is arranged opposite to the Christmas tree body; an indication spring is sleeved on the outer side of the indication rod, one end of the indication spring close to the Christmas tree body is detachably connected to the indication rod, and one end of the indication spring away from the Christmas tree body is detachably connected to the first cover plate.

[0016] Optionally, the second cover plate is connected to the first cover plate by bolts, the bolts are arranged parallel to the axis of the Christmas tree body, the bolts pass through the locking block, and the locking block can slide along the axial direction of the bolts.

[0017] Compared with the prior art, the present invention has the following advantages and technical effects: The present invention realizes sealing of the Christmas tree body by connecting the sealing cavity with a one-way opening to the interior of the Christmas tree body; the locking mechanism drives the locking block to switch between the first position and the second position through the driving assembly. When the locking block is in the first position, the locking block applies an extrusion force to the Christmas tree body in the direction of the axis of the Christmas tree body, and the Christmas tree body produces elastic deformation to squeeze the connector, thereby increasing the friction between the Christmas tree body and the connector, making the two relatively fixed, and realizing locking of the Christmas tree body; when the locking block is in the second position, the locking block and the Christmas tree body are arranged at intervals, and the Christmas tree body and the connector are in an unlocked state. The present invention also controls the position of the locking rod relative to the connector through the locking assembly. Since the locking block and the locking rod are detachably connected, that is, the position of the locking block relative to the connector is controlled by the locking assembly, and the position of the locking block is locked, so that the locking block can continuously apply an extrusion force to the Christmas tree body in the direction of the axis of the Christmas tree body, ensuring that the Christmas tree body and the connector are continuously in a locked state, preventing the locking block from loosening due to the strong seabed pressure and pressure changes, and realizing secondary locking of the Christmas tree body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A top view of the cap of the Christmas tree of the present invention; Figure 2 This is a schematic diagram of the interior of the Christmas tree cap of the present invention; Figure 3 This is a schematic diagram of the interior of the Christmas tree cap of the present invention from another perspective; Figure 4 This is a schematic diagram of the interior of the Christmas tree cap of the present invention from another perspective; Figure 5 It is the hydraulic principle diagram of the present invention; Figure 6 It is a schematic diagram of the locking mechanism structure of the present invention; Figure 7 for Figure 2 A partial enlarged view of middle A.

[0020] Among them, 1. frame, 2. ROV panel, 3. connector body, 4. return pin, 5. guide pin, 6. locking pin, 7. anode block, 8. secondary unlocking punch hole, 9. primary unlocking punch hole, 10. locking punch hole, 11. push rod, 12. shell, 13. upper locking piston, 14. middle piston bolt, 15. locking block, 16. middle unlocking piston, 17. lower piston, 18. second cover plate, 19. bolt, 20. tubing hanger, 21. Christmas tree body, 22. slip, 23. cover plate sleeve, 24. VX gasket, 25. first cover plate, 26. indicator spring, 27. indicator rod, 28. , hexagonal slot nut, 29, cotter pin, 30, test spur, 31, docking spur seat, 32, VXT / CI hydraulic valve, 33, tree cap, 34, first socket, 35, second socket, 36, CIV2 hydraulic valve, 37, hydraulic oil pipeline, 38, anti-corrosion liquid pipeline, 39, locking mechanism, 40, protective cap, 41, locking bushing, 42, locking rod, 43, locking piston, 44, locking block, 45, locking spring, 46, unlocking chamber, 47, first sealing chamber, 48, anti-corrosion liquid connection hole, 49, sequence valve, 50, mounting seat, 51, drive seat, 52, first annular sliding chamber, 53, second annular sliding chamber. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0022] like Figures 1 to 7 The present invention provides a Christmas tree cap, including a connector, a locking mechanism and a locking mechanism. A sealed cavity with a one-way opening is arranged inside the connector, and the Christmas tree body 21 is sleeved on the outside of the open end of the connector, and the sealed cavity is in conduction with the internal channel of the Christmas tree. The locking mechanism includes a locking block 15 arranged circumferentially on the outer periphery of the Christmas tree body 21, and the locking block 15 is connected to a driving assembly for driving the locking block 15 to move; the locking block 15 includes a first position and a second position, and the locking block 15 switches between the first position and the second position based on the driving assembly driving the locking block 15 to move.

[0023] When the locking block 15 is in the first position, the locking block 15 applies an extrusion force to the Christmas tree body 21 in the axial direction of the Christmas tree body 21, and the Christmas tree body 21 produces elastic deformation to squeeze the connector. At this time, the Christmas tree body 21 and the connector are in a locked state; when the locking block 15 is in the second position, the locking block 15 and the Christmas tree body 21 are arranged at an interval. At this time, the Christmas tree body 21 and the connector are in an unlocked state; the locking mechanism 39 includes a locking rod 42 detachably connected to the locking block 15, and a locking assembly is connected between the locking rod 42 and the connector, and the locking assembly is used to control the position of the locking rod 42 relative to the connector.

[0024] The present application realizes sealing of the Christmas tree body by connecting the sealing cavity of the one-way opening of the connector with the interior of the Christmas tree body 21, and the other end of the sealing cavity of the connector is a sealing end; the locking mechanism drives the locking block 15 to switch between the first position and the second position through the driving assembly. When the locking block 15 is in the first position, the locking block 15 applies an extrusion force to the Christmas tree body 21 in the direction of the axis of the Christmas tree body 21, and the Christmas tree body 21 produces elastic deformation to squeeze the connector, thereby increasing the friction between the Christmas tree body 21 and the connector, making the two relatively fixed, and realizing locking of the Christmas tree body 21; when the locking block 15 is in the second position, the locking block 15 and the Christmas tree body 21 are arranged at intervals, and the Christmas tree body 21 and the connector are in an unlocked state. The present invention controls the position of the locking rod 42 relative to the connector through the locking assembly. Since the locking block 15 and the locking rod 42 are detachably connected, that is, the position of the locking block 15 relative to the connector is controlled by the locking assembly, so that the position of the locking block 15 is locked, so that the locking block 15 can continuously apply a squeezing force to the Christmas tree body 21 in the direction of the axis of the Christmas tree body 21, ensuring that the Christmas tree body 21 and the connector are continuously in a locked state, preventing the locking block 15 from loosening due to the high seabed pressure and pressure changes, and realizing secondary locking of the Christmas tree body 21.

[0025] In this embodiment, the locking assembly can control the position of the locking rod 42 relative to the connector by means of a clamping connection, a threaded connection, etc. When the locking assembly adopts a clamping connection, a plurality of through holes are provided on the locking rod 42, and the locking assembly includes a clamping rod, the clamping rod is connected with a telescopic structure, the telescopic mechanism and the connector are detachably connected, and the telescopic mechanism can adopt a cylinder, a hydraulic cylinder or other mechanical structure that can realize the telescopic function; when the locking block 15 is in the first position, the clamping rod and the through hole are in a clamping state, thereby realizing the locking of the locking rod 42, and then realizing the position locking of the locking block 15. Preventing the locking block 15 from loosening due to the high seabed pressure and pressure changes, and realizing the secondary locking of the Christmas tree body 21.

[0026] Further optimization scheme, the locking assembly of this embodiment realizes the locking function of the locking rod 42 by extrusion. In this embodiment, the locking assembly includes a locking bushing 41, a locking block 44 and a mounting seat 50; the locking bushing 41 is sleeved on the outside of the locking rod 42, and the locking bushing 41 is detachably connected to the connector; the locking block 44 is sleeved on the outside of the locking bushing 41, and the locking block 44 is connected to the second driving element, and the second driving element drives the locking block 44 to slide along the axis direction of the locking bushing 41; the mounting seat 50 is detachably connected to the connector, and a locking cavity is opened inside the mounting seat 50, and the locking block 44 is arranged in the locking cavity. The opposite surfaces of the locking block 44 and the mounting seat 50 are respectively a first abutting surface and a second abutting surface, and the distance from the first abutting surface to the locking bushing 41 and the distance from the second abutting surface to the locking bushing 41 are gradually reduced from one end of the locking bushing 41 to the other end.

[0027] When the present embodiment is working, the second driving element drives the locking block 44 to slide along the axial direction of the locking bushing 41. Since the distance from the first abutting surface to the locking bushing 41 and the distance from the second abutting surface to the locking bushing 41 are both gradually reduced from one end of the locking bushing 41 to the other end, the present embodiment stipulates that the direction in which the distance gradually decreases from one end of the locking bushing 41 to the other end is the first direction, and the direction opposite to the first direction is the second direction, that is, the distance from the first abutting surface to the locking bushing 41 and the distance from the second abutting surface to the locking bushing 41 gradually increase in the second direction. When the sliding direction is from the first direction, under the action of the second abutting surface of the mounting seat 50, the distance from the first abutting surface of the locking block 44 to the locking bushing 41 gradually decreases, and the locking block 44 begins to squeeze the locking bushing 41 to deform it. The deformed locking bushing 41 is in close contact with the locking rod 42, and the friction between the two increases, so as to realize the locking function of the locking rod 42, and then realize the position locking of the locking block 15. The locking block 15 is prevented from loosening due to the high seabed pressure and pressure changes, and the secondary locking of the Christmas tree body 21 is achieved. When the sliding direction is from the second direction, the locking block 44 slides on the locking bushing 41, and the distance from the second abutting surface to the locking bushing 41 gradually increases in the second direction. Without the restriction of the second abutting surface, the distance from the first abutting surface of the locking block 44 to the locking bushing 41 gradually increases, and the locking block 44 restores its original shape. The extrusion force between the locking block 44 and the locking bushing 41 is reduced until the locking rod 42 and the locking bushing 41 can slide relative to each other, and unlocking is achieved.

[0028] The second driving element can be mechanically driven, hydraulically driven, or a combination of mechanical and hydraulic. When the second driving element is hydraulically driven, the second driving element is a cylinder or a hydraulic cylinder, the cylinder or the hydraulic cylinder is detachably connected to the connector, the movable end of the cylinder or the hydraulic cylinder is connected to the locking block 44, and the locking block 44 is controlled by the cylinder or the hydraulic cylinder to slide along the axis direction of the locking bushing 41.

[0029] Preferably, this embodiment adopts a mechanical-hydraulic combination method to enable the second driving element to drive the locking block 44 to slide along the axial direction of the locking bushing 41 . The second driving element of this embodiment includes a driving seat 51, a locking piston 43 and a locking spring 45; the driving seat 51 is sleeved on the outer side of the locking bushing 41, and the driving seat 51 is detachably connected to the mounting seat 50, and a sliding cavity arranged along the locking rod 42 is opened in the mounting seat 50; the locking piston 43 is sleeved on the outer side of the locking bushing 41, and the locking piston 43 is slidably arranged in the sliding cavity, and an unlocking cavity 46 is formed between the side of the locking piston 43 away from the mounting seat 50 and the driving seat 51, and the side of the locking piston 43 close to the mounting seat 50 is detachably connected to the locking block 44, and the unlocking cavity 46 is connected to a control oil circuit; one end of the locking spring 45 is detachably connected to the locking block 44, and the end of the locking spring 45 away from the locking block 44 is detachably connected to the connector, based on the elastic force of the locking spring 45, the locking block 44 applies an extrusion force to the locking bushing 41 pointing to the axial direction of the locking bushing 41, and the locking bushing 41 generates elastic deformation to squeeze the locking rod 42.

[0030] When this embodiment is working, based on the elastic force of the locking spring 45, the locking block 44 applies an extrusion force to the locking bushing 41 in the axial direction of the locking bushing 41, and the locking bushing 41 produces elastic deformation to squeeze the locking rod 42, thereby increasing the friction between the locking bushing 41 and the locking rod 42, making the two relatively fixed, thereby achieving position locking of the locking rod 42, and further achieving position locking of the locking block 15. When the locking block 15 needs to be unlocked, hydraulic oil is provided to the unlocking chamber 46 by controlling the oil circuit. Under the continuous supply of hydraulic oil, the locking piston 43 begins to slide in the sliding chamber, thereby driving the locking block 44 detachably connected to the locking piston 43 to move. The locking block 44 overcomes the elastic force of the locking spring 45, and the locking block 44 slides on the locking bushing 41. The distance from the second abutting surface to the locking bushing 41 gradually increases in the second direction. Without the restriction of the second abutting surface, the distance from the first abutting surface of the locking block 44 to the locking bushing 41 gradually increases, and the locking block 44 restores its original shape. The extrusion pressure between the locking block 44 and the locking bushing 41 decreases until the locking rod 42 and the locking bushing 41 can slide relative to each other to achieve unlocking.

[0031] In this embodiment, the locking rod 42 is connected to the locking block 15 by threads to prevent the locking block 15 from loosening due to unexpected circumstances. The locking mechanism also includes a protective cap 40, which is detachably connected to the end of the locking rod 42 away from the locking spring 45 and is arranged on the outside of the connector. The protective cap 40 adopts a thin-wall design to prevent the locking piston 43 from being unable to unlock due to sealing failure. The locking rod 42 is pushed by high pressure to shear off the protective cap 40 to achieve forced unlocking. In this embodiment, the locking rod 42 also has an indication function. The end of the locking rod 42 away from the locking spring 45 extends out of the connector. The position of the locking block 15 relative to the slip 22 or the Christmas tree body 21 can be judged by the staff according to the extension length of the locking rod 42, thereby reducing the error of manual judgment.

[0032] In this embodiment, the locking block 15 can directly contact the Christmas tree body 21. When the locking block is in the first position, the locking block applies a squeezing force to the Christmas tree body in the direction of the axis of the Christmas tree body, and the Christmas tree body produces elastic deformation to squeeze the connector, thereby increasing the friction between the Christmas tree body and the connector, making the two relatively fixed, and achieving the locking of the Christmas tree body. Preferably, the locking mechanism also includes a slip 22, and the connector, the Christmas tree body 21 and the slip 22 are arranged in sequence from the inside to the outside; the locking block 15 is arranged on the radial outer side of the slip 22; when the locking block 15 is in the first position, the locking block 15 applies a squeezing force to the slip 22 in the direction of the axis of the Christmas tree body 21; when the locking block 15 is in the second position, the locking block 15 and the slip 22 are arranged at intervals. The slip 22 is an elastic element. When subjected to a squeezing force, the slip 22 will deform. When the force on the slip 22 is removed, the slip 22 expands due to its own elasticity and releases the lock with the slot of the Christmas tree body 21. In this embodiment, the contact surface of the slip 22 and the Christmas tree body 21 is provided with a slot, and the slip 22 and the Christmas tree body 21 are adapted to prevent the slip 22 and the Christmas tree body 21 from rotating relative to each other. In this embodiment, a guide surface is provided on the side of the locking block 15 close to the slip 22. The guide surface is arranged obliquely, that is, the distance from the guide surface to the axis of the Christmas tree body 21 gradually increases from the second position to the first position. When moving from the second position to the first position, it is ensured that the locking block 15 can move to the outside of the slip 22 and apply a squeezing force to the slip 22.

[0033] In this embodiment, the locking block 15 switches between the first position and the second position by translation, and the translation can be along the radial direction of the Christmas tree body 21 or parallel to the axis of the Christmas tree body 21. When the translation is along the radial direction of the Christmas tree body 21, that is, the direction in which the locking block 15 moves from the second position to the first position is perpendicular to the axis of the Christmas tree body 21.

[0034] Preferably, the translation method adopts the movement parallel to the axis of the Christmas tree body 21. In this embodiment, the connector is provided with a first annular sliding cavity 52 and a second annular sliding cavity 53 in sequence on the radial outer side of the Christmas tree body 21, and the first annular sliding cavity 52 and the second annular sliding cavity 53 are coaxially arranged with the Christmas tree body 21; the driving assembly includes a driving piston, the driving piston is detachably connected with the locking block 15, the locking block 15 is slidably arranged in the first annular sliding cavity 52, and the driving piston is slidably arranged in the second annular sliding cavity 53; the driving piston is driven to slide in the second annular sliding cavity 53 by the first driving element. When the present embodiment is working, the driving piston is controlled by the first driving element to slide in the second annular sliding cavity 53, so that the locking block 15 switches between the first position and the second position. Compared with the method of radial movement along the Christmas tree body 21, the present embodiment adopts the movement parallel to the axis of the Christmas tree body 21, which can reduce the width of the entire device and be parallel to the locking mechanism, so as to facilitate the position locking and unlocking of the locking block 15.

[0035] The first driving element can drive the locking block 15 to switch between the first position and the second position by means of a cylinder or a hydraulic cylinder. Preferably, the first driving element is a hydraulic driving component, and the second annular sliding cavity 53 is respectively provided with a first sealing cavity 47 and a second sealing cavity at both ends of the driving piston, and the first sealing cavity 47 and the second sealing cavity are connected by a control oil circuit. Hydraulic oil is supplied to the first sealing cavity 47 or the second sealing cavity through the control oil circuit, and the hydraulic oil discharged from the other sealing cavity is recovered. Under the continuous supply of hydraulic oil, the driving piston slides in the second annular sliding cavity, thereby driving the locking block 15 to switch between the first position and the second position. Compared with the method of directly driving with a cylinder or a hydraulic cylinder, this embodiment uses the redundant space of the structure to control the movement of the driving piston, so that the required volume of the present invention is smaller. In this embodiment, the driving piston includes an upper locking piston 13, a middle unlocking piston 16 and a lower piston 17. The upper locking piston 13 and the middle unlocking piston 16 are detachably connected through a middle piston bolt 14. A third sealing chamber is arranged between the middle unlocking piston 16, the lower piston 17 and the housing 12, and the third sealing chamber is connected to the control oil circuit.

[0036] Further optimized solution, the connector includes a first cover plate 25, a second cover plate 18 and a housing 12, the first cover plate 25 and the second cover plate 18 are arranged at a relative interval and are detachably connected, the first annular sliding cavity 52 is arranged between the first cover plate 25 and the second cover plate 18, the housing 12 is detachably connected to the circumferential outer side of the cylinder formed by the first cover plate 25 and the second cover plate 18, and the second annular sliding cavity is arranged between the housing 12 and the cylinder. In this embodiment, the first annular sliding cavity 52 and the second annular sliding cavity 53 are formed by the first cover plate 25, the second cover plate 18 and the housing 12, the first sealing cavity 47 is arranged between the first cover plate 25, the housing 12 and the driving piston, and the second sealing cavity is arranged between the second cover plate 18, the housing 12 and the driving piston, and in the process of the driving piston moving, the first sealing cavity 47 and the second sealing cavity are connected with the control oil circuit, and are not connected with other circuits. In this embodiment, the redundant space of the structure is used to control the movement of the driving piston, so that the required volume of the present invention is smaller. In this embodiment, the slips 22 are disposed between the first cover plate 25 and the second cover plate 18 , and the position of the slips 22 remains substantially stationary, and only slightly displaces when the locking block 15 squeezes it, and the displacement direction is perpendicular to the axis of the Christmas tree body 21 .

[0037] In a further optimized solution, the second cover plate 18 is detachably connected to the frame 1 at one end away from the first cover plate 25, and the second cover plate 18 and the frame 1 are correspondingly provided with a receiving cavity for receiving the Christmas tree body 21. The first cover plate 25 is detachably connected to the cover plate sleeve 23 in the receiving cavity, and the one-way opening sealing cavity is the inner cavity of the cover plate sleeve 23. The Christmas tree body 21 is sleeved on the outer side of the opening end of the cover plate sleeve 23, and the slips 22 are arranged on the radial outer side of the cover plate sleeve 23. The locking block 15 applies an extrusion force pointing to the axial direction of the Christmas tree body 21 to the slips 22, and the Christmas tree body 21 produces elastic deformation to squeeze the cover plate sleeve 23, thereby increasing the friction between the Christmas tree body 21 and the cover plate sleeve 23, so that the two are relatively fixed, and the Christmas tree body 21 is locked, and the one-way opening sealing cavity of the cover plate sleeve 23 is connected to the inside of the Christmas tree body 21, so that the Christmas tree body is sealed.

[0038] The frame 1, the connector, and the driving piston are all cylindrical structures, and the upper end surface of the Christmas tree body 21 is a metal sealing surface and a convex conical surface. The end surface of the connector opposite to the upper end surface of the Christmas tree body 21 is a metal sealing surface and a concave conical surface, and the convex conical surface at the upper end of the Christmas tree body 21 cooperates with the concave conical surface at the lower end of the connector. The second cover plate 18 is connected to the frame 1 by bolts. The lower end surface of the frame 1 is a bell mouth, which can provide rough alignment when connected to the Christmas tree body 21. At the same time, a guide pin 5 is provided on the side of the bottom frame. The guide pin 5 is connected to the hole on the Christmas tree body 21, and is connected to the frame 1 with the lock pin 6 and the return pin 4, which can realize secondary position confirmation, can be positioned more quickly and accurately, and greatly reduce the installation operation time. The outer side of the frame 1 is detachably connected with an anode block 7, which is connected to the guide pin 5, the ROV panel 2, and the connector body 3 through a conductive wire, which can effectively protect each component from seawater corrosion, strengthen the protection of the Christmas tree body, and increase the service life of the equipment.

[0039] According to a further optimized solution, an indicating through hole is provided on the first cover plate 25, an indicating rod 27 is inserted into the indicating through hole, one end of the indicating rod 27 extends into the accommodating cavity and is arranged opposite to the Christmas tree body 21; an indicating spring 26 is sleeved on the outer side of the indicating rod 27, one end of the indicating spring 26 close to the Christmas tree body 21 is detachably connected to the indicating rod 27, and one end of the indicating spring 26 away from the Christmas tree body 21 is detachably connected to the first cover plate 25. In this embodiment, when installing the Christmas tree body 21, the Christmas tree body 21 is inserted into the accommodating cavity of the second cover plate 18 and the frame 1. During the insertion process of the Christmas tree body 21, after the Christmas tree body 21 contacts the indicator rod 27, the Christmas tree body 21 continues to be inserted into the accommodating cavity. The Christmas tree body 21 applies a force to the indicator rod 27 to overcome the elastic force of the indicator spring 26. The indicator rod 27 continues to move outward until the Christmas tree body 21 reaches the designated position. At this time, the end of the indicator rod 27 away from the Christmas tree body 21 extends out of the first cover plate 25. The staff can judge whether the Christmas tree body 21 has reached the designated position according to the extended length of the indicator rod 27, thereby reducing the error of manual judgment.

[0040] In a further optimized solution, the second cover plate 18 is connected to the first cover plate 25 by bolts 19, the bolts 19 are arranged parallel to the axis of the Christmas tree body 21, the bolts 19 penetrate the locking block 15, and the locking block 15 can slide axially along the bolts 19. The bolts 19 not only detachably connect the second cover plate 18 to the first cover plate 25, but also prevent the locking block 15 from rotating, so that the locking block 15 can only move along the axis of the Christmas tree body 21. The bolts 19 in this embodiment are threaded bolts, which are threadedly connected with hexagonal slot nuts 28, and a split pin 29 is provided between the hexagonal slot nuts 28 and the second cover plate 18 to prevent the hexagonal slot nuts from loosening.

[0041] In this embodiment, the Christmas tree cap also includes an ROV panel 2 and a control oil circuit. Figure 5 As shown. The frame 1 is connected to the ROV panel 2 by bolts, and the ROV panel 2 is connected to the test spur 30, the docking spur seat 31 and the manual hydraulic valve by bolts. The mechanism can withstand the working conditions of deep water high pressure 15000psi, and through ROV remote control, the locking and unlocking procedures are simple, the operation is convenient, and the operation time is reduced.

[0042] like Figure 5 As shown, the control oil circuit includes a first socket 34 and a second socket 35. The first socket 34 is a VXT / CI and SUL socket, and the second socket 35CL and CUL socket. The VXT / CI port of the first socket 34 is connected to an anti-corrosion liquid pipeline 38, on which a VXT / CI hydraulic valve 32 is arranged. The other end of the anti-corrosion liquid pipeline 38 is connected to an anti-corrosion liquid connection hole 48 opened on the side of the first cover plate 25. The first cover plate 25 is also provided with a second connection hole, which is arranged corresponding to the anti-corrosion liquid connection hole 48. The second connection hole is connected to another anti-corrosion liquid pipeline 38, on which a CIV2 hydraulic valve 36 is arranged. The anti-corrosion liquid pipeline 38 is connected to the environment where the oil production tree cap is located. The SUL port of the first socket 34 is connected to a hydraulic oil pipeline 37, and the hydraulic oil pipeline 37 is connected to the third sealed cavity.

[0043] The CL port of the second socket 35 is connected to a hydraulic oil pipeline 37, and the other end of the hydraulic oil pipeline 37 is connected to the first sealed cavity 47; the CUL port of the second socket 35 is connected to a hydraulic oil pipeline 37, and the other end of the hydraulic oil pipeline 37 is respectively connected to the unlocking cavity 46 and the sequence valve 49, and the sequence valve 49 is connected to the second sealed cavity. The design of the sequence valve 49 can also reduce the number of pipelines, making the locking and unlocking operations more convenient and greatly reducing the operation time.

[0044] Installation of tree cap: Before launching, first place the VX gasket 24 on the test pile, then align the tree cap 33 with the VX gasket 24, and place it on the test pile, screw on the top rod 11, fix the VX gasket 24 on the tree cap 33, and send the assembled tree cap 33 underwater through the pick-up and delivery tool. After the tree cap 33 lands on the XMT return center, operate the ROV to guide the guide pin 5 to the hole on the XMT top plate to achieve secondary alignment of the tree cap 33. In the natural state, the indicator rod 27 fits the stepped surface of the first cover plate 25. During the falling process, when the indicator rod 27 contacts the upper surface of the oil tree body 21, the oil tree body 21 applies a force to the indicator rod 27. Under the action of the force, the indicator rod 27 squeezes the indicator spring 26 and moves upward. According to the position of the indicator rod 27, it is confirmed that the tree cap 33 has fallen to the locked position.

[0045] Tree cap locking: insert the test spur 30 into the CL end of the second socket 35 on the ROV panel 2. When the pressure is low, the sequence valve 49 is in a closed state. The hydraulic oil is first injected into the unlocking chamber 46 along the hydraulic oil pipeline 37. The hydraulic oil pushes the locking piston 43 to move. The locking piston 43 then pushes the locking block 44 to squeeze the locking spring 45 and release the locking bushing 41. As the pressure increases, the hydraulic oil is injected into the first sealing chamber 47. The upper locking piston 13 pushes the locking block 15 to move. The locking block 15 squeezes the slips 22 and the Christmas tree body 21. The card grooves of the two cooperate. Observe the position of the locking rod 42 to determine that the tree cap 33 is in a locked state. When the tree cap 33 reaches the locked position, the cover sleeve 23 also contacts the tubing hanger 20 to prevent the tubing hanger 20 from moving upward, thereby locking the tubing hanger 20. When the hydraulic oil supply is stopped, the locking spring 45 pushes the locking block 44 to tightly embrace the locking bushing 41 due to its own elasticity, so that the locking block 15 is fixed in the locking position to prevent pressure loss and loosening caused by changes in seabed pressure, thereby achieving secondary locking of the tree cap.

[0046] Injection of anti-corrosion liquid: After the high-pressure tree cap 33 is locked with the oil production tree body 21, open the VXT / CI hydraulic valve 32 and the CIV2 hydraulic valve, insert the test spur 30 into the first socket 34, and inject the anti-corrosion liquid along the anti-corrosion liquid pipeline 38 through the anti-corrosion liquid connection hole 48 on the side of the first cover plate. Since the density of the anti-corrosion liquid is greater than the density of seawater, the seawater will be discharged from the opposite side connection hole. When the anti-corrosion liquid is discharged, it means that the seawater inside the oil production tree has been completely discharged. Stop injecting the anti-corrosion liquid and close the VXT / CI hydraulic valve 32 and the CIV2 hydraulic valve.

[0047] Unlocking the tree cap: insert the test spur 30 into the second socket 35CUL end on the ROV panel 2 through the ROV, and inject hydraulic oil. When the pressure is low, the sequence valve 49 is in a closed state, and the hydraulic oil is first injected into the unlocking chamber 46 to push the locking block 44 to move, releasing the locking bushing 41. Continue to pressurize, the sequence valve 49 opens, and the hydraulic oil enters from the second sealing chamber, pushing the lower piston 17 and the middle unlocking piston 16 of the upper locking piston 13 to move, and then pushing the locking block 15 to move upward. The slip 22 expands due to its own elasticity, and releases the lock with the slot of the oil production tree body 21, and the tree cap is unlocked.

[0048] Secondary unlocking of the tree cap: insert the test spur 30 into the first socket 34SUL end on the ROV panel 2 through the ROV, and the hydraulic oil enters the third sealing chamber, directly pushing the middle unlocking piston 16 and then pushing the locking block 15 to move upward. The slip 22 expands due to its own elasticity and releases the lock with the slot of the oil production tree body 21, so that the tree cap 33 is unlocked; in order to avoid the failure of the locking mechanism 39, the protective cap 40 is shearable. When the unlocking pressure reaches a certain intensity, the middle unlocking piston 16 will push the locking rod 42 to forcibly shear off the protective cap 40, thereby unlocking the tree cap 33.

[0049] The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for a person skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

[0050] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0051] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0052] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A Christmas tree cap, characterized in that: include: A connector, wherein a sealed cavity with a one-way opening is arranged inside the connector, a Christmas tree body (21) is sleeved on the outside of the opening end of the connector, and the sealed cavity is in conduction with an internal channel of the Christmas tree body; A locking mechanism, the locking mechanism comprising a locking block (15) arranged in an annular direction on the outer periphery of the Christmas tree body (21), the locking block (15) being connected to a driving assembly for driving the locking block (15) to move; the locking block (15) comprising a first position and a second position, and the locking block (15) switches between the first position and the second position based on the driving assembly driving the locking block (15) to move; When the locking block (15) is in the first position, the locking block (15) applies a squeezing force to the Christmas tree body (21) in the direction of the axis of the Christmas tree body (21), so that the Christmas tree body (21) generates elastic deformation to squeeze the connector; when the locking block (15) is in the second position, the locking block (15) and the Christmas tree body (21) are arranged at an interval; A locking mechanism, the locking mechanism comprising a locking rod (42) detachably connected to the locking block (15), a locking assembly being connected between the locking rod (42) and the connector, the locking assembly being used to control the position of the locking rod (42) relative to the connector; the locking assembly comprising: A locking bushing (41), the locking bushing (41) being sleeved on the outside of the locking rod (42), the locking bushing (41) being detachably connected to the connector; A locking block (44), the locking block (44) being sleeved on the outside of the locking bushing (41), the locking block (44) being connected to a second driving element, the second driving element driving the locking block (44) to slide along the axial direction of the locking bushing (41); A mounting seat (50) is detachably connected to the connector, a locking cavity is provided inside the mounting seat (50), the locking block (44) is arranged in the locking cavity, and opposing surfaces of the locking block (44) and the mounting seat (50) are respectively a first abutting surface and a second abutting surface, and a distance from the first abutting surface to the locking bushing (41) and a distance from the second abutting surface to the locking bushing (41) both gradually decrease from one end of the locking bushing (41) to the other end.

2. The Christmas tree cap according to claim 1, characterized in that: The second driving element comprises: a driving seat (51), the driving seat (51) being sleeved on the outside of the locking bushing (41), the driving seat (51) being detachably connected to the mounting seat (50), and the mounting seat (50) being provided with a sliding cavity arranged along the locking rod (42); a locking piston (43), the locking piston (43) being sleeved on the outside of the locking bushing (41), and the locking piston (43) being slidably disposed in the sliding cavity, an unlocking cavity (46) being formed between a side of the locking piston (43) away from the mounting seat (50) and the driving seat (51), a side of the locking piston (43) close to the mounting seat (50) being detachably connected to a locking block (44), and the unlocking cavity (46) being connected to a control oil circuit; A locking spring (45), one end of the locking spring (45) being detachably connected to the locking block (44), and one end of the locking spring (45) being detachably connected to the connector away from the locking block (44); based on the elastic force of the locking spring (45), the locking block (44) applies a squeezing force to the locking bushing (41) in the direction of the axis of the locking bushing (41), and the locking bushing (41) generates elastic deformation to squeeze the locking rod (42).

3. The Christmas tree cap according to claim 1, characterized in that: The locking mechanism further comprises a slip (22), wherein the connector, the Christmas tree body (21) and the slip (22) are arranged in sequence from the inside to the outside; the locking block (15) is arranged on the radially outer side of the slip (22) in a circumferential direction; when the locking block (15) is in a first position, the locking block (15) applies a squeezing force to the slip (22) in the direction of the axis of the Christmas tree body (21); when the locking block (15) is in a second position, the locking block (15) and the slip (22) are arranged at intervals.

4. The Christmas tree cap according to claim 3, characterized in that: The connector is provided with a first annular sliding cavity (52) and a second annular sliding cavity (53) in sequence on the radial outer side of the Christmas tree body (21), and the first annular sliding cavity (52) and the second annular sliding cavity (53) are coaxially arranged with the Christmas tree body (21); the drive assembly comprises a drive piston, the drive piston is detachably connected to the locking block (15), the locking block (15) is slidably arranged in the first annular sliding cavity (52), and the drive piston is slidably arranged in the second annular sliding cavity; The driving piston is driven to slide in the second annular sliding cavity by the first driving element.

5. The Christmas tree cap according to claim 4, characterized in that: The first driving element is a hydraulic driving element, and the second annular sliding cavity (53) is provided with a first sealing cavity (47) and a second sealing cavity at both ends of the driving piston, respectively, and the first sealing cavity (47) and the second sealing cavity are connected to a control oil circuit.

6. The Christmas tree cap according to claim 4, characterized in that: The connector comprises a first cover plate (25), a second cover plate (18) and a shell (12); the first cover plate (25) and the second cover plate (18) are arranged relatively spaced apart and are detachably connected; the first annular sliding cavity (52) is arranged between the first cover plate (25) and the second cover plate (18); the shell (12) is detachably connected to the circumferential outer side of a cylinder formed by the first cover plate (25) and the second cover plate (18); and the second annular sliding cavity is arranged between the shell (12) and the cylinder.

7. The Christmas tree cap according to claim 6, characterized in that: The end of the second cover plate (18) facing away from the first cover plate (25) is detachably connected to a frame (1); the second cover plate (18) and the frame (1) are respectively provided with a receiving cavity for receiving the Christmas tree body (21); the first cover plate (25) is detachably connected to a cover plate sleeve (23) in the receiving cavity; the one-way opening sealing cavity is the inner cavity of the cover plate sleeve (23); the Christmas tree body (21) is sleeved on the outer side of the opening end of the cover plate sleeve (23); and the slips (22) are arranged radially outside the cover plate sleeve (23).

8. The Christmas tree cap according to claim 7, characterized in that: The first cover plate (25) is provided with an indication through hole, in which an indication rod (27) is inserted, one end of the indication rod (27) extends into the accommodating cavity and is arranged opposite to the Christmas tree body (21); an indication spring (26) is sleeved on the outer side of the indication rod (27), one end of the indication spring (26) close to the Christmas tree body (21) is detachably connected to the indication rod (27), and one end of the indication spring (26) away from the Christmas tree body (21) is detachably connected to the first cover plate (25).

9. The Christmas tree cap according to claim 6, characterized in that: The second cover plate (18) is connected to the first cover plate (25) via a bolt (19). The bolt (19) is arranged parallel to the axis of the Christmas tree body (21). The bolt (19) passes through the locking block (15). The locking block (15) can slide axially along the bolt (19).

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