Quickly disassembled and assembled underwater test tree

Abstract

The application discloses a kind of underwater test trees of quick dismounting maintenance, including hydraulic control connector-disconnector, easily dismounting safety valve shell, ball valve mechanism, center tube body, lower joint and sealing parts.Hydraulic oil passage, reagent passage are equipped in the device to realize the connection, disconnect, plugging, shearing and chemical reagent injection of device.The application adopts the split safety valve shell of quick dismounting, solves the problem of difficult internal component overhaul replacement and reassembly;Ball valve mechanism adopts modular design and can be taken out as a whole, solves the problem of low maintenance efficiency of key components;The lower end of plugging ball valve device adopts composite sealing structure, and the improved kazarri sealing structure is used at each connection of safety valve shell, which solves the problem of overflow and leakage of high-pressure oil and gas after plugging ball valve is closed;Metal lens pad is arranged at the hydraulic pipeline disconnecting position, which solves the problem of hydraulic oil leakage or hydraulic drive failure;Pressure relief hole solves the problem of complex structure and low reliability of pump-through spring device.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of marine oil and gas and natural gas hydrate equipment, and particularly relates to a quick dismounting and mounting underwater test tree. BACKGROUND

[0002] With the development of land oil and gas resources gradually entering the later period, marine oil and gas development accounts for an increasingly large proportion in the world. China's South China Sea is rich in deepwater oil, natural gas and natural gas hydrate resources. In the process of exploration and development, testing operation is an important link. However, due to the harsh environment of deepwater testing operation and the narrow space of the floating drilling platform, equipment and personnel are concentrated. Once an accident occurs, not only will it cause significant equipment and economic losses, but also will endanger the safety of the operating personnel and cause serious damage to the ecological environment. The underwater test tree is a key device for ensuring the safety of the operation when deepwater testing is performed. When encountering special sea conditions, the continuous oil pipe or steel wire in the test pipe column can be quickly cut off, the high-pressure oil and gas in the test pipe column can be blocked, and the test pipe column can be quickly disconnected, so as to ensure the quick withdrawal of the floating platform, protect the safety of personnel, avoid pollution of the marine environment and damage to the testing equipment. However, through research and analysis of the existing underwater test tree device and similar devices with the above functions, it is found that there are still many deficiencies in the field operation process and later maintenance, as follows:

[0003] (1) The safety valve shell of the existing similar device is a whole cylindrical cylinder, and the internal parts need to be disassembled along the axial direction of the shell. Since the parts are numerous and the structure is complex, large and complex tools are needed for disassembly, and the operation is difficult, thus leading to the problems of complicated and complex internal part maintenance and replacement process, and the difficulty of reinstallation after maintenance and replacement.

[0004] (2) The sealing surface of the ball valve of the existing similar device is easily eroded by high-pressure oil and gas when the ball valve is opened, thereby affecting the sealing property in the closed state. Therefore, regular maintenance is needed for the key parts such as the ball valve, but the other parts need to be disassembled first, which leads to the problems of large workload and low efficiency of the maintenance of the key parts such as the ball valve.

[0005] (3) The existing similar device does not use reliable sealing parts at the connection between the lower end of the blocking ball valve device and the central pipe body and the connection between the safety valve outer shell, and high-pressure oil and gas in the central pipe body is prone to overflow after the blocking ball valve is closed, causing oil and gas leakage.

[0006] (4) The hydraulic pipeline disconnecting part of the existing similar device cannot be quickly centered during installation and does not consider the sealing property, which is prone to cause hydraulic oil leakage and hydraulic drive failure.

[0007] (5) The spring device for realizing the pump-through function of the existing similar device has a complex structure and low reliability.

[0008] In summary, in order to effectively solve the problems existing in the prior art, it is urgent to invent a quick disassembly and maintenance underwater test tree to solve the problems of complicated and complex internal component maintenance and replacement process, difficulty in reassembly, low maintenance efficiency of key components, easy overflow and leakage of high-pressure oil and gas, hydraulic oil leakage or hydraulic drive failure, complex structure of pump-through spring device and low reliability. SUMMARY

[0009] (I) The technical problems solved are:

[0010] In view of the problems existing in the application of the prior art and the demand for deep-sea oil, natural gas and natural gas hydrate exploitation, a quick disassembly and maintenance underwater test tree is invented. The split safety valve shell is adopted, and the shell can be quickly disassembled and assembled only with an electric screwdriver, so that the internal components do not need to be disassembled one by one along the axial direction of the shell, solving the problems of large and complex tools, high operation difficulty, complicated and complex maintenance and replacement process, and difficult reinstallation after maintenance. The upper valve seat, lower valve seat and ball valve in the ball valve mechanism are modularly designed and can be taken out as a whole, so that the maintenance of key components such as ball valves can be carried out without disassembling other components one by one, solving the problems of large maintenance workload and low efficiency of key components such as ball valves. The composite sealing structure of metal lens gasket and O-ring is used between the lower end of the plugging ball valve device and the center pipe body, and the improved Kazari sealing structure is used at the connection of the safety valve shell and the lower joint, which can avoid overflow of high-pressure oil and gas in the center pipe body after the plugging ball valve is closed and ensure the sealing performance of the shell to avoid oil and gas leakage. The metal lens gasket is arranged at the disconnected position of the hydraulic pipeline, which can realize quick centering of the pipeline during installation and ensure the sealing performance, avoiding hydraulic oil leakage or hydraulic drive failure. The center pipe body is provided with a pressure relief hole, which has a simple structure and can improve the reliability of the pump-through spring device, solving the problem of complex structure and low reliability of the existing pump-through spring device.

[0011] (II) Technical solutions:

[0012] The utility model provides a kind of quick dismounting maintenance underwater test tree, which is composed of hydraulic control continuous disconnecting device, easily dismounting safety valve shell, ball valve mechanism, center tube, lower joint and sealing parts.The hydraulic control continuous disconnecting device is composed of auxiliary lifting ring, auxiliary lifting ring core shaft, hydraulic control continuous disconnecting device shell, piston push ring, center body, sealing ring support ring, support stop ring, wedge lock core, limiting stop ring, shuttle valve controller, self-locking spring core shaft, self-locking spring, screw I, screw II, bolt IV, positioning pin I.The auxiliary lifting ring is provided with four counterbores in the circumferential direction, located on the upper end surface of the hydraulic control continuous disconnecting device shell, the auxiliary lifting ring core shaft passes through the counterbores and the through hole of the hydraulic control continuous disconnecting device shell, the lower stud of the auxiliary lifting ring core shaft is connected with the upper end threaded blind hole of the piston push ring, the hydraulic control continuous disconnecting device shell is sleeved on the outside of the center body to form a hollow cavity, the piston push ring installed in the hollow cavity can move axially up and down in the cavity, the upper end of the hydraulic control continuous disconnecting device shell is provided with four auxiliary lifting ring core shaft stud through holes in the circumferential direction, eight cylindrical holes I are used to install self-locking springs, the outer ring surface of the hydraulic control continuous disconnecting device shell is circumferentially distributed with counterbores II, annular space unlocking holes, threaded through holes I, and the lower end is provided with square guide notches I, the bolt IV passes through the counterbores II and threaded blind holes II to fixedly connect the hydraulic control continuous disconnecting device shell with the center body, the sealing ring support ring is provided with sealing ring grooves III inside and outside, and is sleeved on the sealing ring support ring surface of the center body, the upper ring surface of the support stop ring is provided with threaded through holes II in the circumferential direction, and the lower ring surface is provided with a square hole, the screw II passes through the threaded through holes II and threaded blind holes III to fix the support stop ring to the center body, the wedge lock core is installed in the square hole, and is provided with a vertical face end and an inclined face end, the inclined face end is in smooth contact with the wedge-shaped arc groove ring surface of the piston push ring, the outer ring surface of the limiting stop ring is provided with threaded blind holes IV in the circumferential direction, the screw I passes through the threaded through holes I and threaded blind holes IV to fix the limiting stop ring to the hydraulic control continuous disconnecting device shell, the upper end of the self-locking spring core shaft is in contact with the self-locking spring, and the lower end self-locking spring core shaft stud is connected with the threaded blind holes I, the shuttle valve controller is installed in the upper mounting hole I and lower mounting hole, and the positioning pin I is installed in the upper mounting hole II and lower threaded mounting hole I of the shell I, so that the hydraulic control continuous disconnecting device and the safety valve shell I can be quickly centered when they are connected.The easily dismounting safety valve shell is composed of shell I, shell II and screw III, the shell I is provided with square guide notches II matched with square guide notches I, the shell I is provided with annular inner grooves, and the connection and disconnection with the hydraulic control continuous disconnecting device are realized by closely engaging and separating with the vertical face end, the upper part of the shell I is provided with arc end face I, arc end face II, annular ring face I, longitudinal plane I, longitudinal end face I and longitudinal end face II, and the inside is provided with inner boss I, inner boss II, inner boss III, inner boss IV, inner groove I, inner groove II, inner groove III and inner groove IV, and the bottom end is provided with threaded blind holes VI.The shell II is provided with arc end face III, arc end face IV, annular ring surface II, longitudinal plane II, longitudinal end face III, longitudinal end face IV, and is internally provided with inner boss V, inner boss VI, inner boss VII, inner boss VIII, inner recess V, inner recess VI, inner recess VII, inner recess VIII, and is circumferentially provided with threaded blind hole VII at the bottom end, wherein the arc end face III is matched with the arc end face I, the arc end face IV is matched with the arc end face II, the annular ring surface II is matched with the annular ring surface I, the longitudinal plane II is matched with the longitudinal plane I, the longitudinal end face III is matched with the longitudinal end face I, the longitudinal end face IV is matched with the longitudinal end face II, the shell I and the shell II are fixedly connected by the screw III passing through the threaded through hole III, the threaded through hole V and the threaded blind hole V to form a safety valve shell inner chamber, wherein the inner recess II and the inner recess VI form a positioning ring chamber I, the inner recess IV and the inner recess VIII form a positioning ring chamber II, the inner boss I and the upper end of the inner boss V are the upper chamber of the piston I, the lower end of the inner boss I and the inner boss V is a shearing ball valve module device chamber, the lower end of the inner boss II and the inner boss VI is the lower chamber of the piston I, the lower end of the positioning ring chamber I is the upper chamber of the piston II, the lower end of the inner boss III and the inner boss VII is a plugging ball valve module device chamber, the lower end of the inner boss IV and the inner boss VIII is the lower chamber of the piston II; the ball valve mechanism is composed of the ball valve piston I, the shearing ball valve upper seat, the shearing ball valve lower seat, the shearing ball valve, the bolt III, the reset spring II, the positioning ring I, the ball valve piston II, the plugging ball valve upper seat, the plugging ball valve lower seat, the plugging ball valve, the bolt II, the reset spring I and the positioning ring II, the ball valve piston I is sleeved outside the central pipe body I and the central pipe body II and is installed in the upper chamber and the lower chamber of the piston I, the shearing ball valve upper seat and the shearing ball valve lower seat are fixedly connected through the bolt III, the shearing ball valve is internally arranged and installed in the shearing ball valve module device chamber and in the rectangular hole of the piston I, the arc boss I and the arc boss II are installed in the inner recess I and the inner recess V to circumferentially position the shearing ball valve upper and lower seats, the reset spring II is installed in the lower chamber of the piston I and located at the upper end of the positioning ring I, the positioning ring I is installed in the positioning ring chamber I, the ball valve piston II is sleeved outside the central pipe body II and the central pipe body III and is installed in the upper chamber and the lower chamber of the piston II, the plugging ball valve upper seat and the plugging ball valve lower seat are fixedly connected through the bolt II, the plugging ball valve is internally arranged and installed in the plugging ball valve module device chamber, the arc boss III and the arc boss IV are installed in the inner recess III and the inner recess VII to circumferentially position the plugging ball valve upper and lower seats, the reset spring I is installed in the lower chamber of the piston II and located at the upper end of the positioning ring II, and the positioning ring II is installed in the positioning ring chamber II.The center tube body is composed of a center tube body I, a center tube body II and a center tube body III, the upper end of the center tube body I is provided with a metal lens pad sealing groove XII, the lower periphery is provided with a pressure relief hole II, the upper end is in contact with the upper end surface of the upper chamber of the piston I, and the lower end is in contact with the upper end surface of the upper valve seat of the shear ball valve, the lower periphery of the center tube body II is provided with a pressure relief hole I, the upper end is in contact with the lower end surface of the lower valve seat of the shear ball valve, and the lower end is in contact with the upper end surface of the upper valve seat of the plugging ball valve, the upper end of the center tube body III is provided with a composite sealing ring groove II, the lower end is provided with a metal lens pad sealing groove XI, the upper end is in contact with the lower end surface of the lower valve seat of the plugging ball valve, and the lower end is in contact with the lower connector; the lower connector is provided with a threaded through hole IX in the periphery, and the bolt I is fixedly connected with the safety valve shell by penetrating the threaded through hole IX, the threaded blind hole VI and the threaded blind hole VII; the sealing parts are composed of a metal lens pad I, a metal lens pad II, a metal lens pad III, a metal lens pad IV, a metal lens pad V, a composite sealing pad, an arc-shaped sealing compression strip, a triangular cross-section arc-shaped sealing strip, a straight sealing compression strip, a triangular cross-section straight sealing strip, a triangular cross-section sealing ring, a sealing compression strip ring, a pre-tightening bolt I and a pre-tightening bolt II, wherein the metal lens pad I is arranged in the metal lens pad sealing groove IV and the metal lens pad sealing groove VII, the metal lens pad II is arranged in the metal lens pad sealing groove VI, the metal lens pad sealing groove VIII and the metal lens pad sealing groove X, the metal lens pad III is arranged in the metal lens pad sealing groove XI and the metal lens pad sealing groove IX, the metal lens pad IV is arranged in the metal lens pad sealing groove XII and the metal lens pad sealing groove V, the metal lens pad V is arranged in the metal lens pad sealing groove III and the metal lens pad sealing groove I, the composite sealing pad is arranged in the composite sealing ring groove II and the composite sealing ring groove I, the arc-shaped sealing compression strip and the triangular cross-section arc-shaped sealing strip are arranged in the arc-shaped sealing groove of the shell II, the straight sealing compression strip and the triangular cross-section straight sealing strip are arranged in the straight sealing groove of the shell II, and the triangular cross-section sealing ring and the sealing compression strip ring are arranged in the sealing ring groove XI of the lower connector.

[0013] The upper end of the piston push ring is provided with 12 threaded blind holes I in the periphery, and is internally provided with an inner boss IX and a sealing ring groove I, the upper end of the piston push ring is provided with a piston push ring upper chamber ring surface above the inner boss IX, a piston push ring lower chamber ring surface below the inner boss IX, and a wedge-shaped circular arc groove ring surface below the inner boss IX, and the axial positioning of the piston push ring on the center body is realized by the limiting stop ring.

[0014] The center body is provided with internal thread, facilitating connection with the upper end device of underwater test tree, metal lens gasket sealing ring groove I is arranged in the lower part of the inner ring surface, smooth ring surface is arranged in the lower part of the inner ring surface, the center body is internally provided with hydraulic disconnecting oil way for driving piston push ring to move up and down, hydraulic connecting oil way, shearing ball valve closing oil way for providing power for lower device, shearing ball valve opening oil way, plugging ball valve closing oil way, plugging ball valve opening oil way and chemical reagent injection channel, metal lens gasket sealing ring groove II is arranged on the upper port of each oil way channel, upper mounting hole I and upper mounting hole II are arranged on the lower end surface of the center body, the shearing ball valve closing oil way, the shearing ball valve opening oil way, the plugging ball valve closing oil way, the plugging ball valve opening oil way and the chemical reagent injection channel are communicated with the upper mounting hole I, the outer ring surface of the center body is provided with threaded blind hole II, threaded blind hole III, outer boss, sealing ring groove II, piston push ring cavity ring surface, sealing ring support ring surface.

[0015] The shell I is provided with the outer ring surface of the center pipe body IV matched with the smooth ring surface, the metal lens gasket sealing groove III is arranged on the upper end surface of the center pipe body IV, the shell I is provided with the end surface matched with the upper hydraulic disconnecting device, the lower mounting hole and the lower threaded mounting hole I are circumferentially arranged on the end surface, the lower mounting hole is communicated with the hydraulic pipeline I arranged in the inner part of the safety valve shell, the annular inner groove is arranged below the end surface, the sealing groove I is arranged on the arc-shaped end surface I and the longitudinal end surface I of the shell I, the sealing groove II is arranged on the longitudinal end surface II, the threaded blind hole V is arranged on the circumferential ring surface I and the longitudinal plane I for fixedly connecting the shell II, the metal lens gasket sealing groove V is arranged on the upper end surface of the upper chamber of the piston I, the metal lens gasket sealing groove IV is arranged at the hydraulic pipeline disconnecting position of the arc-shaped end surface II, the shearing ball valve opening hydraulic oil injection hole is arranged in the lower chamber of the piston I, the plugging ball valve opening hydraulic oil injection hole is arranged in the lower chamber of the piston II, the inner ring surface I is arranged at the lower end of the inner groove IV of the shell I, the metal lens gasket sealing groove VI is arranged at the hydraulic pipeline disconnecting position.

[0016] The shell II is provided with the arc-shaped sealing groove on the circumferential ring surface II, the straight sealing groove is arranged on the longitudinal plane II, the threaded through hole IV is circumferentially arranged on the outer ring surface, the threaded through hole VI is longitudinally arranged for mounting the pre-tightening bolt II, the pre-tightening bolt II applies pre-tightening force to the arc-shaped sealing compression strip to compress the triangular cross-section arc-shaped sealing strip, so that the circumferential sealing between the shell II and the shell I is realized, the pre-tightening bolt II applies pre-tightening force to the straight sealing compression strip to compress the triangular cross-section straight sealing strip, so that the longitudinal sealing between the shell II and the shell I is realized, the metal lens gasket sealing groove VII is arranged at the hydraulic pipeline disconnecting position of the arc-shaped end surface IV, the shearing ball valve closing hydraulic oil injection hole is arranged in the upper chamber of the piston I, the plugging ball valve closing hydraulic oil injection hole is arranged in the upper chamber of the piston II, the upper mounting hole III and the inner ring surface II are arranged at the lower end of the inner groove VIII of the shell II, the metal lens gasket sealing groove VIII is arranged at the hydraulic pipeline disconnecting position.

[0017] The ball valve piston I inner ring surface is provided with four sealing ring grooves IV, the upper push ring is provided with sealing ring groove V and chamfer I, the lower push ring is provided with sealing ring groove VI and chamfer II, the middle outer ring surface is provided with two sealing ring grooves VII, the middle part is provided with a rectangular hole, the left and right sides of the rectangular hole are symmetrically provided with key grooves for installing keys, two threaded blind holes VIII are arranged on the keys, two threaded through holes VII are arranged on the key grooves, the screw IV passes through the threaded through holes VII and the threaded blind holes VIII to connect and fix the keys to the ball valve piston I, the left and right sides of the rectangular hole are symmetrically provided with cylindrical holes II matched with the valve rod cylindrical bosses, the up and down movement of the ball valve piston I can drive the valve rod to slide in the valve rod sliding groove, so as to drive the shear ball valve to rotate.

[0018] The upper valve seat of the shear ball valve is provided with sealing ring groove VIII, two arc-shaped notches I, four through holes I, symmetrically arranged arc-shaped bosses I, valve rod installation notches I, semicircular arc holes I and semicircular arc sealing ring grooves I, the lower valve seat of the shear ball valve is provided with sealing ring groove IX, four threaded blind holes IX, symmetrically arranged arc-shaped bosses II, semicircular arc holes II and semicircular arc sealing ring grooves II, the shear ball valve is provided with notches, symmetrically arranged rotating shafts I and valve rod sliding grooves I on both sides, the valve rod is installed in the valve rod sliding groove I, the bolt III passes through the through holes I and the threaded blind holes IX to fixedly connect the upper and lower valve seats of the shear ball valve, the shear ball valve is arranged inside, and a shear ball valve device module is formed, after the screw IV on the shear ball valve piston is disassembled, the shear ball valve device module can be integrally taken out.

[0019] The upper valve seat of the shear ball valve is provided with sealing ring groove VIII, two arc-shaped notches I, four through holes I, symmetrically arranged arc-shaped bosses I, valve rod installation notches I, semicircular arc holes I and semicircular arc sealing ring grooves I, the lower valve seat of the shear ball valve is provided with sealing ring groove IX, four threaded blind holes IX, symmetrically arranged arc-shaped bosses II, semicircular arc holes II and semicircular arc sealing ring grooves II, the shear ball valve is provided with notches, symmetrically arranged rotating shafts I and valve rod sliding grooves I on both sides, the valve rod is installed in the valve rod sliding groove I, the bolt III passes through the through holes I and the threaded blind holes IX to fixedly connect the upper and lower valve seats of the shear ball valve, the shear ball valve is arranged inside, and a shear ball valve device module is formed, after the screw IV on the shear ball valve piston is disassembled, the shear ball valve device module can be integrally taken out.

[0020] The lower joint is provided with a metal lens gasket sealing groove IX, a hydraulic pipeline II and a sealing ring groove X, a metal lens gasket sealing groove X is arranged at the position where the hydraulic pipeline is disconnected, the lower threaded mounting hole II cooperates with the upper mounting hole III to arrange the positioning pin II inside, the positioning pin II can realize quick centering when the lower joint is connected with the safety valve shell, the boss ring surface cooperates with the inner ring surface I and the inner ring surface II, and threaded through holes VIII and threaded through holes IX are arranged in the circumferential direction, the threaded through holes VIII are used for installing the pre-tightening bolt I, the pre-tightening bolt I applies pre-tightening force to the sealing pressing strip ring to press the triangular cross-section sealing ring, so that the circumferential sealing of the safety valve shell and the lower joint is realized, and the threaded female buckle is convenient for being connected with the lower end device of the underwater test tree.

[0021] The composite sealing gasket is composed of a metal lens gasket VI and two O-shaped sealing rings.

[0022] (Three) the beneficial effects of the present application are:

[0023] (1) the present application adopts split type safety valve shell, only with electric screwdriver can quickly disassemble the shell, solve the internal parts overhaul replacement cumbersome complex, reassembly operation difficult problem;

[0024] (2) the ball valve seat, ball valve lower valve seat and ball valve take modular design, and only disassemble the screw on the driving piston can the ball valve module device is taken out as a whole, solve the ball valve and other key components of the maintenance efficiency problem;

[0025] (3) the sealing structure between the lower end of the ball valve device and the center pipe body, the safety valve shell connection and the improved kathari sealing structure of the lower joint connection, solve the problem of high pressure oil and gas overflow in the center pipe body after the ball valve is closed and the poor sealing of the shell, which is easy to cause oil and gas leakage;

[0026] (4) metal lens pad is used at the disconnected place of hydraulic pipeline, which can realize the quick centering of the pipeline during installation and ensure the sealing performance, solve the problem of hydraulic oil leakage or hydraulic drive failure;

[0027] (5) the center pipe body is provided with a pressure relief hole, when the ball valve is in the closed state, high pressure oil and gas enters the pressure relief hole, pushes the ball valve piston to move downward, makes the ball valve rotate, realizes the positive pressure pump through of the test pipe column, solves the problem of complex structure and low reliability of the existing pump through spring device. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a whole half sectional view of the present application which can be quickly disassembled and maintained underwater testing tree;

[0029] Figure 2 is a perspective view of the hydraulic control connector of the present application;

[0030] Figure 3 is a perspective view of the piston push ring of the hydraulic control connector of the present application;

[0031] Figure 4 is a perspective view of the center body of the hydraulic control connector of the present application;

[0032] Figure 5 is a perspective view of the support ring and wedge-shaped lock core of the present application;

[0033] Figure 6 is a three-dimensional schematic view of the safety valve shell I of the present application;

[0034] Figure 7 is a three-dimensional schematic view of the safety valve shell II of the present application;

[0035] Figure 8 is a perspective view of the lower joint of the present application;

[0036] Figure 9 Three-dimensional exploded view of the shearing ball valve module device and its perspective sectional view of the present invention;

[0037] Figure 10 Perspective sectional view of the blocking ball valve module device of the present invention;

[0038] Figure 11 Three-dimensional exploded view of the shearing ball valve piston and its perspective sectional view of the present invention;

[0039] Figure 12 Three-dimensional schematic view of the assembly process of the blocking ball valve module device and the blocking ball valve piston of the present invention;

[0040] Figure 13 Three-dimensional schematic view of the disassembly of the safety valve housing of the present invention;

[0041] Figure 14 Three-dimensional perspective sectional view of the Casari sealing structure of the safety valve housing of the present invention;

[0042] Figure 15 Three-dimensional perspective sectional view of the metal lens gasket and the composite gasket of the present invention;

[0043] Figure 16 Three-dimensional schematic view and perspective sectional view of the center tube body of the present invention.

[0044] 1- auxiliary ring, 101- counterbore I; 2- hydraulic control on-off tool housing, 201- through hole I, 202- cylindrical hole I, 203- counterbore II, 204- annular unlocking hole, 205- threaded through hole I, 206- square guide notch I; 3- piston push ring, 301- threaded blind hole I, 302- inner boss IX, 303- sealing ring groove I, 304- upper chamber ring surface of piston push ring, 305- lower chamber ring surface of piston push ring, 306- wedge-shaped circular arc groove ring surface; 4- center body, 401- internal thread, 402- metal lens pad sealing groove I, 403- smooth ring surface, 404- hydraulic disconnecting oil path, 405- shear ball valve closing oil path, 406- chemical reagent injection channel, 407- metal lens pad sealing groove II, 408- upper mounting hole I, 409- upper mounting hole II, 410- threaded blind hole II, 411- outer boss, 412- sealing ring groove II, 413- piston push ring chamber ring surface, 414- sealing ring support ring surface, 415- threaded blind hole III, 416- hydraulic connecting oil path, 417- shear ball valve opening oil path, 418- blocking ball valve closing oil path, 419- blocking ball valve opening oil path; 5- sealing ring support ring, 501- sealing ring groove III; 6- support stop ring, 601- threaded through hole II, 602- square hole; 7- wedge-shaped lock core, 701- vertical face end, 702- inclined face end; 8- limit stop ring, 801- threaded blind hole IV; 9- housing I, 901- center pipe body IV, 902- metal lens pad sealing groove III, 903- end face, 904- lower mounting hole, 905- lower threaded mounting hole I, 906- annular inner groove, 907- hydraulic line I, 908- square guide notch II, 909- arc-shaped end face I, 910- arc-shaped end face II, 911- annular ring surface I, 912- longitudinal plane I, 913- shear ball valve opening hydraulic oil injection hole, 914- longitudinal end face I, 915- longitudinal end face II, 916- threaded blind hole V, 917- metal lens pad sealing groove IV, 918- sealing groove I, 919- sealing groove II, 920- metal lens pad sealing groove V, 921- inner boss I, 922- inner groove I, 923- inner boss II, 924- inner groove II, 925- inner boss III, 926- inner groove III, 927- inner boss IV, 928- inner groove IV, 929- inner ring surface I, 930- blocking ball valve opening hydraulic oil injection hole, 931- threaded blind hole VI, 932- metal lens pad sealing groove VI;10-Housing II, 1001-Arc-shaped end face III, 1002-Threaded through hole III, 1003-Threaded through hole IV, 1004-Threaded through hole V, 1005-Threaded through hole VI, 1006-Circumferential ring face II, 1007-Arc-shaped sealing groove, 1008-Arc-shaped end face IV, 1009-Metal lens gasket sealing groove VII, 1010-Straight sealing groove, 101 1-Longitudinal plane II, 1012-Longitudinal end face III, 1013-Longitudinal end face IV, 1014-Hydraulic oil injection hole for shear ball valve closing, 1015-Inner boss V, 1016-Inner groove V, 1017-Inner boss VI, 1018-Inner groove VI, 1019-Inner boss VII, 1020-Inner groove VII, 1021-Inner boss VIII, 1022-Inner groove Groove VIII, 1023 - Metal lens gasket sealing groove VIII, 1024 - Threaded blind hole VII, 1025 - Upper mounting hole III, 1026 - Sealing ball valve closing hydraulic oil injection hole, 1027 - Inner annular surface II; 11 - Metal lens gasket I; 12 - Shear ball valve piston, 1201 - Sealing ring groove IV, 1202 - Sealing ring groove V, 1203 - Chamfer I, 1204 - Chamfer II, 1205- Sealing ring groove VI, 1206- Sealing ring groove VII, 1207- Rectangular hole, 1208- Keyway, 1209- Key, 1210- Threaded blind hole VIII, 1211- Threaded through hole VII, 1212- Cylindrical hole II; 13- Upper valve seat of shear ball valve, 1301- Sealing ring groove VIII, 1302- Arc-shaped groove I, 1303- Through hole II 1304-Arc-shaped boss I, 1305-Valve stem mounting groove I, 1306-Semi-circular arc hole I, 1307-Semi-circular arc sealing ring groove I; 14-Lower valve seat of shear ball valve, 1401-Sealing ring groove IX, 1402-Threaded blind hole IX, 1403-Arc-shaped boss II, 1404-Semi-circular arc hole II, 1405-Semi-circular arc sealing ring groove II; 15-Positioning retaining ring I; 16-Plugging ball valve piston; 17-Plugging ball valve upper valve seat, 1701-Sealing ring groove X, 1702-Arc-shaped groove II, 1703-Arc-shaped boss III, 1704-Semi-circular arc sealing ring groove III, 1705-Valve stem mounting groove II; 18-Plugging ball valve lower valve seat, 1801-Composite sealing ring groove I, 1802-Arc-shaped boss IV, 18 03-Semi-circular arc sealing ring groove Ⅳ; 19-Reset spring Ⅰ; 20-Positioning retaining ring Ⅱ; 21-Metal lens gasket Ⅱ; 22-Bolt Ⅰ; 23-Preload bolt Ⅰ; 24-Lower connector; 2401-Metal lens gasket sealing groove IX; 2402-Metal lens gasket sealing groove X; 2403-Lower threaded mounting hole Ⅱ; 2404-Threaded through hole VIII; 2405-Sealing ring groove XI; 2406-Threaded through hole IX; 2407-Hydraulic pipeline Ⅱ; 2408-Boss annular surface; 2409-Threaded female thread; 25-Metal lens gasket Ⅲ; 26-Central tube body Ⅲ; 2601-Composite sealing ring groove Ⅱ; 2602-Metal lens gasket sealing groove XI; 27-Composite sealing gasket; 2701-Metal lens gasket VI; 2702-O-ring seal;28 - ball valve, 2801 - rotating shaft II, 2802 - valve rod sliding groove II; 29 - bolt II; 30 - central pipe body II, 3001 - pressure relief hole I; 31 - reset spring II; 32 - plug; 33 - shear ball valve, 3301 - notch, 3302 - rotating shaft I, 3303 - valve rod sliding groove I; 34 - bolt III; 35 - central pipe body I, 3501 - metal lens gasket sealing groove XII, 3502 - pressure relief hole II; 36 - metal lens gasket IV; 37 - screw I; 38 - shuttle valve controller; 39 - metal lens gasket V; 40 - auxiliary lifting ring mandrel, 4001 - auxiliary lifting ring mandrel lower stud; 41 - self-locking spring mandrel, 4101 - self-locking spring mandrel stud; 42 - self-locking spring; 43 - screw II; 44 - valve rod, 4401 - valve rod cylindrical boss; 45 - bolt IV; 46 - dowel pin I; 47 - screw III; 48 - pre-tightening bolt II; 49 - arc-shaped sealing compression strip; 50 - triangular cross-section arc-shaped sealing gasket; 51 - triangular cross-section straight sealing gasket; 52 - sealing compression strip; 53 - triangular cross-section sealing ring gasket; 54 - sealing compression ring; 55 - dowel pin II; 56 - screw IV; 57 - screw V. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below with reference to the drawings.

[0046] As Figures 1-16The utility model discloses a kind of underwater test trees of quick dismounting maintenance, which is composed of hydraulic control connector, easily dismountable safety valve shell, ball valve mechanism, center tube, lower joint and sealing parts;Hydraulic control connector includes auxiliary lifting ring 1, auxiliary lifting ring core shaft 40, hydraulic control connector shell 2, piston push ring 3, center body 4, sealing ring support ring 5, support stop ring 6, wedge lock core 7, limit stop ring 8, self-locking spring core shaft 41, self-locking spring 42, shuttle valve controller 38, screw I 37, screw II 43, bolt IV 45, positioning pin I 46, auxiliary lifting ring 1 is provided with four counterbores I 101 circumferentially, located in the upper end surface of hydraulic control connector shell 2, auxiliary lifting ring core shaft 40 passes through counterbores I 101 and the through hole I 201 of hydraulic control connector shell 2, auxiliary lifting ring core shaft lower stud 4001 is connected with the upper end threaded blind hole I 301 of piston push ring 3, hydraulic control connector shell 2 is sleeved on the outside of center body 4 to form hollow cavity, and piston push ring 3 is installed in the hollow cavity, four through holes I 201 are provided on the upper end circumferential surface of hydraulic control connector shell 2, eight cylindrical holes I 202 are used for installing self-locking spring 42, and hydraulic control connector shell 2 is circumferentially distributed with counterbores II 203, annular unlocking hole 204, threaded through hole I 205 and square guide notch I 206 arranged at the lower end, bolt IV 45 passes through counterbores II 203 and the threaded blind hole II 410 of center body 4 threaded blind hole II 410 to fixedly connect hydraulic control connector shell 2 with center body 4, sealing ring support ring 5 is sleeved on the sealing ring support surface 414, the upper ring surface of support stop ring 6 is provided with threaded through hole II 601 circumferentially, and the lower ring surface is provided with square hole 602 circumferentially, screw II 43 passes through threaded through hole II 601 and threaded blind hole III 415 to fix support stop ring 6 to center body 4, wedge lock core 7 is installed in square hole 602, and vertical face end 701 and inclined face end 702 are arranged, inclined face end 702 is in smooth contact with wedge-shaped circular arc bevel joint surface 306, limit stop ring 8 is circumferentially provided with threaded blind hole IV 801 on the outer ring surface, screw I 37 passes through threaded through hole I 205 and threaded blind hole IV 801 to fix limit stop ring 8 on hydraulic control connector shell 2, the upper end of self-locking spring core shaft 41 is in contact with self-locking spring 42, self-locking spring core shaft stud 4101 is connected with threaded blind hole I 301, shuttle valve controller 38 is installed in upper mounting hole I 408 and lower mounting hole 904, and positioning pin I 46 is installed in upper mounting hole II 409 and lower threaded mounting hole I 905.The easy-to-disassemble safety valve shell comprises a shell I 9, a shell II 10 and a screw III 47. The shell I 9 is provided with a square guide slot II 908 matched with a square guide slot I 206. The shell I 9 is provided with an annular inner groove 906, and the connection and disconnection of the hydraulic control continuous-disconnector and the safety valve shell I 9 are realized by tightly connecting and separating the annular inner groove 906 and the vertical face end 701. The upper part of the shell I 9 is provided with an arc-shaped end face I 909, an arc-shaped end face II 910, a ring-shaped ring face I 911, a longitudinal plane I 912, a longitudinal end face I 914 and a longitudinal end face II 915. The inner part is provided with an inner boss I 921, an inner boss II 923, an inner boss III 925, an inner boss IV 927, an inner groove I 922, an inner groove II 924, an inner groove III 926 and an inner groove IV 928. The bottom end is circumferentially provided with a threaded blind hole VI 931. The shell II 10 is provided with an arc-shaped end face III 1001, an arc-shaped end face IV 1008, a ring-shaped ring face II 1006, a longitudinal plane II 1011, a longitudinal end face III 1012 and a longitudinal end face IV 1013. The inner part is provided with an inner boss V 1015, an inner boss VI 1017, an inner boss VII 1019, an inner boss VIII 1021, an inner groove V 1016, an inner groove VI 1018, an inner groove VII 1020 and an inner groove VIII 1022. The bottom end is circumferentially provided with a threaded blind hole VII 1024. The arc-shaped end face III 1001 is matched with the arc-shaped end face I 909, the arc-shaped end face IV 1008 is matched with the arc-shaped end face II 910, the ring-shaped ring face II 1006 is matched with the ring-shaped ring face I 911, the longitudinal plane II 1011 is matched with the longitudinal plane I 912, the longitudinal end face III 1012 is matched with the longitudinal end face I 914, the longitudinal end face IV 1013 is matched with the longitudinal end face II 915, and the shell I 9 and the shell II 10 are fixedly connected by the screw III 47 passing through the threaded through hole III 1002, the threaded through hole V 1004 and the threaded blind hole V 916 to form a safety valve shell inner chamber. The inner groove II 924 and the inner groove VI 1018 form a positioning ring chamber I, the inner groove IV 928 and the inner groove VIII 1022 form a positioning ring chamber II, the inner boss I 921 and the inner boss V 1015 form an upper chamber of a piston I, the inner boss I 921 and the inner boss V 1015 form a shearing ball valve module device chamber, the inner boss II 923 and the inner boss VI 1017 form a lower chamber of the piston I, the positioning ring chamber I forms an upper chamber of a piston II, the inner boss III 925 and the inner boss VII 1019 form a plugging ball valve module device chamber, and the inner boss IV 927 and the inner boss VIII 1021 form a lower chamber of the piston II.The ball valve mechanism comprises a ball valve piston 112, a shearing ball valve upper valve seat 13, a shearing ball valve lower valve seat 14, a shearing ball valve 33, a bolt 134, a reset spring 131, a positioning stop ring 115, a ball valve piston 116, a plugging ball valve upper valve seat 17, a plugging ball valve lower valve seat 18, a plugging ball valve 28, a bolt 129, a reset spring 119, and a positioning stop ring 120. The ball valve piston 112 is sleeved outside the central pipe body 135 and the central pipe body 130 and is installed in the piston I upper chamber and the piston I lower chamber. The shearing ball valve upper valve seat 13 and the shearing ball valve lower valve seat 14 are fixedly connected through the bolt 134, the shearing ball valve 33 is arranged in the shearing ball valve module device chamber and is arranged in the rectangular hole 1207 of the piston I 12. The arc-shaped boss 1304 and the arc-shaped boss 1403 are installed in the inner groove 1922 and the inner groove V 1016 to circumferentially position the shearing ball valve upper valve seat and the shearing ball valve lower valve seat. The reset spring 131 is installed in the piston I lower chamber and is located at the upper end of the positioning stop ring 115. The positioning stop ring 115 is installed in the positioning stop ring chamber I. The ball valve piston 116 is sleeved outside the central pipe body 130 and the central pipe body 126 and is installed in the piston II upper chamber and the piston II lower chamber. The plugging ball valve upper valve seat 17 and the plugging ball valve lower valve seat 18 are fixedly connected through the bolt 129, the plugging ball valve 28 is arranged in the plugging ball valve module device chamber, the arc-shaped boss 1703 and the arc-shaped boss 1802 are installed in the inner groove 1926 and the inner groove VII 1020 to circumferentially position the plugging ball valve upper valve seat and the plugging ball valve lower valve seat. The reset spring 119 is installed in the piston II lower chamber and is located at the upper end of the positioning stop ring 120. The positioning stop ring 120 is installed in the positioning stop ring chamber II.The central tube body includes central tube body I 35, central tube body II 30, and central tube body III 26. Central tube body I 35 has a metal lens gasket sealing groove XII 3501 at its upper end and a pressure relief hole II 3502 circumferentially located at its lower part. Its upper end contacts the upper surface of the upper chamber of piston I, and its lower end contacts the upper surface of the upper valve seat 13 of the shear ball valve. Central tube body II 30 has a pressure relief hole I 3001 circumferentially located at its lower part. Its upper end contacts the lower surface of the lower valve seat 14 of the shear ball valve, and its lower end contacts the upper surface of the upper valve seat 17 of the sealing ball valve. Central tube body III 26 has a composite sealing ring groove II 2601 at its upper end and a metal lens gasket sealing groove XI 260 at its lower end. 2. The upper end contacts the lower end face of the lower valve seat 18 of the plugging ball valve, and the lower end contacts the lower connector 24. The lower connector 24 is provided with a threaded through hole IX2406 around its circumference. Bolt I22 passes through the threaded through hole IX2406 and the threaded blind hole VI931 and threaded blind hole VII1024 to fix the lower connector 24 to the safety valve body. The sealing parts include metal lens gasket I11, metal lens gasket II21, metal lens gasket III25, metal lens gasket IV36, metal lens gasket V39, composite sealing gasket 27, arc-shaped sealing strip 49, triangular cross-section arc-shaped sealing gasket 50, sealing strip 52, and triangular cross-section straight sealing gasket 51. The components include a triangular cross-section sealing ring gasket 53, a sealing pressure ring 54, a pre-tightening bolt I 23, and a pre-tightening bolt II 48. Metal lens gasket I 11 is embedded in metal lens gasket sealing grooves IV 917 and VII 1009; metal lens gasket II 21 is embedded in metal lens gasket sealing grooves VI 932, VIII 1023, and X 2402; metal lens gasket III 25 is embedded in metal lens gasket sealing grooves XI 2602 and IX 2401; and metal lens gasket IV 36 is embedded in metal lens gasket sealing groove XII 3501 and the metal lens gasket sealing groove. In sealing groove V920, metal lens gasket V39 is embedded in metal lens gasket sealing groove III902 and metal lens gasket sealing groove I402; composite sealing gasket 27 is embedded in composite sealing ring groove II2601 and composite sealing ring groove I1801; arc-shaped sealing strip 49 and triangular cross-section arc-shaped sealing gasket 50 are installed in arc-shaped sealing groove 1007; sealing strip 52 and triangular cross-section straight sealing gasket 51 are installed in straight sealing groove 1010; triangular cross-section sealing ring gasket 53 and sealing pressure ring 54 are installed in sealing ring groove XI2405. This completes the assembly of the quickly disassembled and maintained underwater test tree.

[0047] The workflow of this invention is as follows:

[0048] In the event of special sea conditions, such as typhoons, tides, tsunamis, or other emergencies, hydraulic oil is injected from the shear ball valve closing oil circuit 405 through hydraulic line I 907 into the upper chamber of piston I via the shear ball valve closing hydraulic oil injection hole 1014. This drives the shear ball valve piston 12 to move upward, causing the valve stem 44 to slide in the valve stem sliding groove I 3303, thus causing the shear ball valve 33 to rotate along the rotating shaft I 3302, thereby completing the shearing of the shear ball valve 33. At the same time, hydraulic oil is injected from the sealing ball valve closing oil circuit 418 through hydraulic line I 907 into the upper chamber of piston II via the sealing ball valve closing hydraulic oil injection hole 1026. This drives the sealing ball valve piston 16 to move upward, causing the valve stem 44 to slide in the valve stem sliding groove II 2802, thus causing the sealing ball valve 28 to rotate along the rotating shaft II 2801, thereby completing the sealing of the sealing ball valve 28. After shearing and sealing are completed, disconnection from the upper hydraulic coupling begins. A command is issued from the offshore floating platform, and hydraulic oil is injected from the hydraulic disconnection oil circuit 404 into the lower chamber of the piston push ring 3, driving the piston push ring 3 upwards. At this time, the wedge-shaped lock core inclined end 702 moves outwards along with the wedge-shaped arc bevel surface 306 of the piston push ring, causing the vertical end 701 to separate from the annular inner groove 906, thereby disconnecting the test string and allowing the offshore platform to evacuate quickly. When the hydraulic disconnection mechanism fails, annular disconnection can be used. In this case, the annular pipeline is connected to the annular unlocking hole 204, and hydraulic oil is injected into the lower end face of the piston push ring 3, pushing the piston push ring 3 upwards, thereby disconnecting the test string. When the hydraulic disconnection mechanism fails, a matching unlocking tool can also be lowered to pull up the auxiliary lifting ring 1. Under the action of overcoming the self-locking spring force of the hydraulic coupling and the hydraulic oil pressure, the piston push ring 3 is pulled upwards, thereby achieving mechanically assisted unlocking of the hydraulic coupling.

[0049] Once the emergency has subsided, move the offshore platform to a suitable position and inject hydraulic oil into the hydraulic connection circuit 416. The hydraulic oil enters the upper chamber of the piston push ring 3, driving the piston push ring 3 to move downward. At this time, the wedge-shaped lock core inclined end 702 moves inward with the piston push ring wedge-shaped arc bevel ring surface 306, so that the vertical end 701 is tightly engaged with the annular inner groove 906, thereby reconnecting the test string. After reconnection, the offshore platform issues a control command. Hydraulic oil is injected from the shear ball valve opening oil passage 417 via hydraulic line I 907 and into the lower chamber of piston I through the shear ball valve opening hydraulic oil injection hole 913. This drives the shear ball valve piston 12 to move downward, causing the valve stem 44 to slide in the valve stem sliding groove I 3303, thus causing the shear ball valve 33 to rotate along the rotating shaft I 3302, thereby opening the shear ball valve 33. Simultaneously, hydraulic oil is injected from the sealing ball valve opening oil passage 419 via hydraulic line I 907 and into the lower chamber of piston II through the sealing ball valve opening hydraulic oil injection hole 930. This drives the sealing ball valve piston 16 to move downward, causing the valve stem 44 to slide in the valve stem sliding groove II 2802, thus causing the sealing ball valve 28 to rotate along the rotating shaft II 2801, thereby opening the sealing ball valve 28.

[0050] When the device needs to be maintained, only the bolt 22, screw 47 is twisted off with electric screwdriver, the lower joint 24, shell 10 can be taken off, the screw 56 on the shear ball valve piston 112 is twisted off, the shear ball valve device can be taken out as a whole, the screw 57 on the blocking ball valve piston 116 is twisted off, the blocking ball valve device can be taken out as a whole, then other parts can be taken out one by one, according to the need to overhaul and replace, and the reinstallation cooperation operation process after maintenance is also simple and fast.

[0051] Finally, it should be noted that: the above examples are only used to illustrate and not limit the technical solutions of the present application, although the present application is described in detail with reference to the above examples, those skilled in the art should understand that: still can be modified or equivalent to replace, without departing from the spirit and scope of the present application any modification or partial replacement, it should be covered in the scope of the claims of the present application.

Claims

1. A quick disassembly and maintenance underwater test tree, which is composed of hydraulic control continuous disconnectors, easily disassembled safety valve housings, ball valve mechanisms, central pipe bodies, lower joints and sealing parts; the hydraulic control continuous disconnectors are composed of auxiliary lifting rings (1), auxiliary lifting ring shafts (40), hydraulic control continuous disconnector housings (2), piston pushing rings (3), central bodies (4), sealing ring support rings (5), support stop rings (6), wedge-shaped lock cores (7), limiting stop rings (8), self-locking spring shafts (41), self-locking springs (42), shuttle valve controllers (38), screw I (37), screw II (43), bolt IV (45), positioning pin I (46), the auxiliary lifting rings (1) are provided with four counterbores I (101) in the circumferential direction, located on the upper end surface of the hydraulic control continuous disconnector housing (2), the auxiliary lifting ring shafts (40) pass through the counterbores I (101) and the through holes I (201) of the hydraulic control continuous disconnector housing (2), the auxiliary lifting ring shaft lower studs (4001) are connected with the upper end threaded blind holes I (301) of the piston pushing rings (3), the hydraulic control continuous disconnector housing (2) is sleeved outside the central body (4) to form a hollow cavity, the piston pushing ring (3) installed in the hollow cavity can move up and down in the axial direction, the upper end of the hydraulic control continuous disconnector housing (2) is provided with four through holes I (201) in the circumferential direction, eight cylindrical holes I (202) are used for installing the self-locking springs (42), the outer ring surface of the hydraulic control continuous disconnector housing (2) is provided with a counterbore II (203), an annular space unlocking hole (204), a threaded through hole I (205) and a square guide notch I (206) at the lower end, the bolt IV (45) passes through the counterbore II (203) and the threaded blind hole II (410) of the central body (4) to fixedly connect the hydraulic control continuous disconnector housing (2) and the central body (4), the sealing ring support ring (5) is provided with sealing ring grooves III (501) inside and outside, is sleeved on the sealing ring support ring surface (414) of the central body (4), the upper ring surface of the support stop ring (6) is provided with a threaded through hole II (601) in the circumferential direction, the lower ring surface is provided with a square hole (602) in the circumferential direction, the screw II (43) passes through the threaded through hole II (601) and the threaded blind hole III (415) of the central body (4) to fixedly connect the support stop ring (6) to the central body (4), the wedge-shaped lock core (7) is installed in the square hole (602) and is provided with a vertical face end (701) and an inclined face end (702), the inclined face end (702) is in smooth contact with the wedge-shaped circular arc bevel ring surface (306) of the piston pushing ring (3), the outer ring surface of the limiting stop ring (8) is provided with a threaded blind hole IV (801) in the circumferential direction, the screw I (37) passes through the threaded through hole I (205) and the threaded blind hole IV (801) to fixedly connect the limiting stop ring (8) to the hydraulic control continuous disconnector housing (2), the upper end of the self-locking spring shaft (41) is in contact with the self-locking spring (42), the lower end self-locking spring shaft stud (4101) is connected with the threaded blind hole I (301), the shuttle valve controller (38) is installed in the upper installation hole I (408) of the central body (4) and the lower installation hole (904) of the housing I (9).The positioning pin I (46) is installed in the upper mounting hole II (409) of the central body (4) and the lower threaded mounting hole I (905) of the shell I (9), which can realize quick centering when the hydraulic continuous connector is connected with the safety valve shell I (9); the easy-to-disassemble safety valve shell is composed of the shell I (9), the shell II (10) and the screw III (47), the shell I (9) is provided with a square guide notch II (908) matched with a square guide notch I (206), the shell I (9) is provided with an annular inner groove (906) which is connected with and separated from the vertical face end (701) to realize connection and disconnection with the hydraulic continuous connector, the upper part of the shell I (9) is provided with an arc-shaped end face I (909), an arc-shaped end face II (910), a ring-shaped annular face I (911), a longitudinal plane I (912), a longitudinal end face I (914) and a longitudinal end face II (915), and the inside is provided with an inner boss I (921), an inner boss II (923), an inner boss III (925), an inner boss IV (927), an inner groove I (922), an inner groove II (924), an inner groove III (926) and an inner groove IV (928), the bottom end is circumferentially provided with a threaded blind hole VI (931), the ring-shaped annular face I (911) and the longitudinal plane I (912) are both provided with a threaded blind hole V (916), the shell II (10) is provided with an arc-shaped end face III (1001), an arc-shaped end face IV (1008), a ring-shaped annular face II (1006), a longitudinal plane II (1011), a longitudinal end face III (1012) and a longitudinal end face IV (1013) matched with the shell I (9), and the inside is provided with an inner boss V (1015), an inner boss VI (1017), an inner boss VII (1019), an inner boss VIII (1021), an inner groove V (1016), an inner groove VI (1018), an inner groove VII (1020) and an inner groove VIII (1022), the bottom end is circumferentially provided with a threaded blind hole VII (1024), the outer annular face of the shell II (10) is circumferentially provided with a threaded through hole III (1002) and longitudinally provided with a threaded through hole V (1004), wherein the arc-shaped end face III (1001) is matched with the arc-shaped end face I (909), the arc-shaped end face IV (1008) is matched with the arc-shaped end face II (910), the ring-shaped annular face II (1006) is matched with the ring-shaped annular face I (911), the longitudinal plane II (1011) is matched with the longitudinal plane I (912), the longitudinal end face III (1012) is matched with the longitudinal end face I (914), the longitudinal end face IV (1013) is matched with the longitudinal end face II (915), and the shell I (9) and the shell II (10) are fixedly connected by the screw III (47) passing through the threaded through hole III (1002), the threaded through hole V (1004) and the threaded blind hole V (916) to form a safety valve shell inner chamber.Wherein the inner groove II (924) and the inner groove VI (1018) constitute the positioning ring chamber I, the inner groove IV (928) and the inner groove VIII (1022) constitute the positioning ring chamber II, the inner boss I (921) and the inner boss V (1015) upper end is piston I upper chamber, the inner boss I (921) and the inner boss V (1015) lower end is shear ball valve module device chamber, the inner boss II (923) and the inner boss VI (1017) lower end is piston I lower chamber, the positioning ring chamber I lower end is piston II upper chamber, the inner boss III (925) and the inner boss VII (1019) lower end is blocking ball valve module device chamber, the inner boss IV (927) and the inner boss VIII (1021) lower end is piston II lower chamber; The ball valve mechanism is composed of ball valve piston I (12), shear ball valve upper seat (13), shear ball valve lower seat (14), shear ball valve (33), bolt III (34), reset spring II (31), positioning ring I (15), ball valve piston II (16), blocking ball valve upper seat (17), blocking ball valve lower seat (18), blocking ball valve (28), bolt II (29), reset spring I (19), positioning ring II (20), the ball valve piston I (12) is arranged outside the center pipe body I (35), the center pipe body II (30) and is installed in the piston I upper chamber, the piston I lower chamber, the shear ball valve upper seat (13) and the shear ball valve lower seat (14) are fixedly connected through the bolt III (34), the shear ball valve (33) is built-in, is installed in the shear ball valve module device chamber and is built-in in the rectangular hole (1207) of the piston I (12), the arc boss I (1304) and the arc boss II (1403) are installed in the inner groove I (922) and the inner groove V (1016) and are circumferentially positioned to the shear ball valve upper and lower seat, the reset spring II (31) is installed in the piston I lower chamber and is located on the upper end of the positioning ring I (15), the positioning ring I (15) is installed in the positioning ring chamber I, the ball valve piston II (16) is arranged outside the center pipe body II (30), the center pipe body III (26) and is installed in the piston II upper chamber, the piston II lower chamber, the blocking ball valve upper seat (17) and the blocking ball valve lower seat (18) are fixedly connected through the bolt II (29), the blocking ball valve (28) is built-in, is installed in the blocking ball valve module device chamber, the arc boss III (1703) and the arc boss IV (1802) are installed in the inner groove III (926) and the inner groove VII (1020) and are circumferentially positioned to the blocking ball valve upper and lower seat, the reset spring I (19) is installed in the piston II lower chamber and is located on the upper end of the positioning ring II (20), the positioning ring II (20) is installed in the positioning ring chamber II; The center pipe body is composed of the center pipe body I (35), the center pipe body II (30) and the center pipe body III (26), the center pipe body I (35) upper end is equipped with metal lens pad sealing groove XII (3501), lower circumferential is equipped with pressure relief hole II (3502),The upper end of the center tube body I (35) is in contact with the upper end face of the upper chamber of the piston I, and the lower end is in contact with the upper end face of the upper valve seat (13) of the shear ball valve. The lower part of the center tube body II (30) is provided with a pressure relief hole I (3001) in the circumference. The upper end of the center tube body II (30) is in contact with the lower end face of the lower valve seat (14) of the shear ball valve, and the lower end is in contact with the upper end face of the upper valve seat (17) of the plugging ball valve. The upper end of the center tube body III (26) is provided with a composite sealing ring groove II (2601), and the lower end is provided with a metal lens pad sealing groove X (2602). The upper end of the center tube body III (26) is in contact with the lower end face of the lower valve seat (18) of the plugging ball valve, and the lower end is in contact with the lower joint (24). The lower joint (24) is provided with a threaded through hole IX (2406) in the circumference. The bolt I (22) passes through the threaded through hole IX (2406), the threaded blind hole VI (931), and the threaded blind hole VII (1024) to fixedly connect the lower joint (24) with the safety valve shell. The sealing parts are composed of a metal lens pad I (11), a metal lens pad II (21), a metal lens pad III (25), a metal lens pad IV (36), a metal lens pad V (39), a composite sealing pad (27), an arc-shaped sealing pressing strip (49), a triangular cross-section arc-shaped sealing pad (50), a sealing pressing strip (52), a triangular cross-section straight sealing pad (51), a triangular cross-section sealing ring pad (53), a sealing pressing ring (54), a pre-tightening bolt I (23), and a pre-tightening bolt II (48). The metal lens pad I (11) is built in the metal lens pad sealing groove IV (917) and the metal lens pad sealing groove VII (1009). The metal lens pad II (21) is built in the metal lens pad sealing groove VI (932), the metal lens pad sealing groove VIII (1023), and the metal lens pad sealing groove X (2402). The metal lens pad III (25) is built in the metal lens pad sealing groove X (2602) and the metal lens pad sealing groove IX (2401). The metal lens pad IV (36) is built in the metal lens pad sealing groove XII (3501) and the metal lens pad sealing groove V (920). The metal lens pad V (39) is built in the metal lens pad sealing groove III (902) and the metal lens pad sealing groove I (402). The composite sealing pad (27) is built in the composite sealing ring groove I (1801) and the composite sealing ring groove II (2601). The arc-shaped sealing pressing strip (49) and the triangular cross-section arc-shaped sealing pad (50) are installed in the arc-shaped sealing groove (1007). The sealing pressing strip (52) and the triangular cross-section straight sealing pad (51) are installed in the straight sealing groove (1010). The triangular cross-section sealing ring pad (53) and the sealing pressing ring (54) are installed in the sealing ring groove IX (2405).

2. The underwater test tree of claim 1, wherein: The upper end of the piston push ring (3) is circumferentially distributed with 12 threaded blind holes I (301), and is provided with an inner boss IX (302), a sealing ring groove I (303), an upper chamber ring surface (304) above the inner boss IX (302), a lower chamber ring surface (305) below the inner boss IX (302), and a wedge-shaped circular arc bevel ring surface (306) below. The piston push ring (3) is axially positioned on the central body (4) by a limiting stop ring (8).

3. The underwater test tree of claim 1, wherein: The central body (4) is provided with an inner thread (401) for connecting with an upper device of a subsea test tree, and is provided with a metal lens pad sealing ring groove I (402) and a smooth ring surface (403) in the lower part of the inner ring surface. The central body (4) is internally provided with a hydraulic disconnect oil path (404) and a hydraulic connection oil path (416) for driving the piston push ring (3) to move up and down, a shear ball valve closing oil path (405) and a shear ball valve opening oil path (417) for providing power to a lower device, a plugging ball valve closing oil path (418) and a plugging ball valve opening oil path (419), and a chemical reagent injection channel (406). The upper ports of the oil paths are each provided with a metal lens pad sealing ring groove II (407). The lower end surface of the central body (4) is provided with an upper mounting hole I (408) and an upper mounting hole II (409). The shear ball valve closing oil path (405), the shear ball valve opening oil path (417), the plugging ball valve closing oil path (418), the plugging ball valve opening oil path (419), and the chemical reagent injection channel (406) are in communication with the upper mounting hole I (408). The outer ring surface of the central body (4) is provided with a threaded blind hole II (410), a threaded blind hole III (415), an outer boss (411), a sealing ring groove II (412), a piston push ring chamber ring surface (413), and a sealing ring support ring surface (414).

4. The underwater test tree of claim 1, wherein: The outer ring surface of the central pipe body IV (901) of the shell I (9) is matched with the smooth ring surface (403). The upper end surface of the central pipe body IV (901) is provided with a metal lens pad sealing groove III (902). The shell I (9) is provided with a matching end surface (903) of an upper hydraulic disconnect switch. The lower end surface (903) is provided with a lower threaded mounting hole I (905) and circumferentially provided with a lower mounting hole (904). The lower mounting hole (904) is in communication with a hydraulic pipeline I (907) arranged in the inner part of a safety valve shell. The lower end surface (903) is provided with an annular inner groove (906). The arc-shaped end surface I (909) and the longitudinal end surface I (914) of the shell I (9) are provided with a sealing groove I (918). The longitudinal end surface II (915) is provided with a sealing groove II (919). The upper end surface of the upper chamber of the piston I is provided with a metal lens pad sealing groove V (920). The arc-shaped end surface II (910) is provided with a metal lens pad sealing groove IV (917) at the hydraulic pipeline disconnecting position. The lower chamber of the piston I is provided with a shear ball valve opening hydraulic oil injection hole (913). The lower chamber of the piston II is provided with a plugging ball valve opening hydraulic oil injection hole (930). The lower end of the inner groove IV (928) of the shell I (9) is provided with an inner ring surface I (929). The metal lens pad sealing groove VI (932) is arranged at the hydraulic pipeline disconnecting position.

5. The underwater test tree of claim 1, wherein: The shell II (10) is provided with an arc-shaped sealing groove (1007) on the circumferential ring surface II (1006), a straight sealing groove (1010) on the longitudinal plane II (1011), a threaded through hole IV (1003) in the circumferential direction, and a threaded through hole VI (1005) in the longitudinal direction for mounting the pre-tightening bolt II (48). The pre-tightening bolt II (48) applies a pre-tightening force to the arc-shaped sealing pressing strip (49) to press the triangular cross-section arc-shaped sealing gasket (50) to achieve the circumferential sealing between the shell II (10) and the shell I (9). The pre-tightening bolt II (48) applies a pre-tightening force to the sealing pressing strip (52) to press the triangular cross-section straight sealing gasket (51) to achieve the longitudinal sealing between the shell II (10) and the shell I (9). The arc-shaped end face IV (1008) is provided with a metal lens gasket sealing groove VII (1009) at the hydraulic pipeline break, the piston I upper chamber is provided with a shear ball valve to close the hydraulic oil injection hole (1014), and the piston II upper chamber is provided with a plugging ball valve to close the hydraulic oil injection hole (1026). The lower end of the inner groove VIII (1022) is provided with an upper mounting hole III (1025) and an inner ring surface II (1027), and the hydraulic pipeline break is provided with a metal lens gasket sealing groove VIII (1023).

6. The underwater test tree of claim 1, wherein: The inner ring surface of the ball valve piston I (12) is provided with four sealing ring grooves IV (1201), the upper push ring is provided with a sealing ring groove V (1202) and a chamfer I (1203), the lower push ring is provided with a sealing ring groove VI (1205) and a chamfer II (1204), the middle outer ring surface is provided with two sealing ring grooves VII (1206), the middle part is provided with a rectangular hole (1207), the left and right sides of the rectangular hole (1207) are symmetrically provided with a key groove (1208) for mounting a key (1209), the key (1209) is provided with two threaded blind holes VIII (1210), the key groove (1208) is provided with two threaded through holes VII (1211), the screw IV (56) passes through the threaded through holes VII (1211) and the threaded blind holes VIII (1210) to connect and fix the key (1209) to the ball valve piston I (12), the left and right sides of the rectangular hole (1207) are symmetrically provided with a cylindrical hole II (1212) matched with the valve rod cylindrical boss (4401), and the up and down movement of the ball valve piston I (12) can drive the valve rod (44) to slide in the valve rod sliding groove (3303), thereby driving the shear ball valve (33) to rotate.

7. The underwater test tree of claim 1, wherein: The upper valve seat (13) of the shearing ball valve is provided with sealing ring groove VIII (1301), two arc-shaped notches I (1302), four through holes II (1303), symmetrically arranged circular arc-shaped bosses I (1304), valve rod mounting notches I (1305), semicircular arc holes I (1306), and semicircular arc sealing ring grooves I (1307). The lower valve seat (14) of the shearing ball valve is provided with sealing ring groove IX (1401) and four threaded blind holes IX (1402), and is symmetrically provided with circular arc-shaped bosses II (1403), semicircular arc holes II (1404), and semicircular arc sealing ring grooves II (1405). The shearing ball valve (33) is provided with a notch (3301), and rotation shafts I (3302) and valve rod sliding grooves I (3303) are symmetrically arranged on both sides. The valve rod (44) is mounted in the valve rod sliding groove I (3303). The shearing ball valve upper and lower valve seats are fixedly connected by bolts III (34) penetrating through the through holes II (1303) and the threaded blind holes IX (1402), and the shearing ball valve (33) is arranged inside, thereby forming a shearing ball valve module device. After the screws IV (56) on the shearing ball valve piston (12) are disassembled, the shearing ball valve module device can be taken out as a whole.

8. The underwater test tree of claim 1, wherein: The upper valve seat (17) of the blocking ball valve is provided with sealing ring groove X (1701) and two arc-shaped notches II (1702), and is symmetrically provided with circular arc-shaped bosses III (1703), semicircular arc sealing ring grooves III (1704), and valve rod mounting notches II (1705). The lower valve seat (18) of the blocking ball valve is provided with composite sealing ring groove I (1801), and is symmetrically provided with circular arc-shaped bosses IV (1802) and semicircular arc sealing ring grooves IV (1803). The blocking ball valve (28) is symmetrically provided with rotation shafts II (2801) and valve rod sliding grooves II (2802) on both sides. The blocking ball valve upper and lower valve seats are fixedly connected by bolts II (29), and the blocking ball valve (28) is arranged inside, thereby forming a blocking ball valve module device. After the screws V (57) on the blocking ball valve piston (16) are disassembled, the blocking ball valve module device can be taken out as a whole.

9. The underwater test tree of claim 1, wherein: The lower joint (24) is provided with metal lens pad sealing groove IX (2401), hydraulic pipeline II (2407), and sealing ring groove X (2405). The metal lens pad sealing groove X (2402) is arranged at the hydraulic pipeline breakage. The lower threaded mounting hole II (2403) cooperates with the upper mounting hole III (1025) to arrange the positioning pin II (55) inside, so that the lower joint (24) can be quickly centered when being connected with the safety valve shell. The boss annular surface (2408) cooperates with the inner annular surface I (929) and the inner annular surface II (1027). Threaded through holes VIII (2404) and threaded through holes IX (2406) are circumferentially arranged. The threaded through holes VIII (2404) are used for mounting the pre-tightening bolt I (23). The pre-tightening bolt I (23) applies pre-tightening force to the sealing compression ring (54) to press the triangular cross-section sealing ring pad (53), so as to realize the annular sealing of the safety valve shell and the lower joint (24). The threaded female buckle (2409) is arranged to facilitate the connection with the lower end device of the underwater test tree.

10. The underwater test tree of claim 1, wherein: The composite sealing gasket (27) is composed of a metal lens gasket VI (2701) and two O-rings (2702).

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