CN113638734A

CN113638734A - Underwater test tree

Info

Publication number: CN113638734A
Application number: CN202110944300.5A
Authority: CN
Inventors: 赵亮; 张锦锦; 景建平; 罗伟波
Original assignee: Baoji Changyou Petroleum Equipment Co ltd
Current assignee: Baoji Changyou Petroleum Equipment Co ltd
Priority date: 2021-08-17
Filing date: 2021-08-17
Publication date: 2021-11-12

Abstract

The invention belongs to the technical field of offshore deepwater test related petroleum equipment, and relates to an underwater test tree, which comprises a latching part; a main body part, one end of which is sleeved in the latch part; the latch connecting structure is sleeved between the latch part and the body part, one end of the latch connecting structure is connected with the latch part, and the other end of the latch connecting structure is clamped with the body part; and the control structure is arranged on the latch part and the body part and is used for controlling the action of the latch connecting structure so as to realize the connection or the separation of the latch part and the body part. The double-ball valve has the advantages of reliable structure, double fault protection mechanisms, controllable disconnection and connection functions, complete functions, extremely strong risk control performance, strong practicability and high popularization value, and the second ball valve has the functions of shearing a continuous oil pipe or a cable, injecting a chemical agent, mechanically releasing a bolt and pumping.

Description

Underwater test tree

Technical Field

The invention belongs to the technical field of relevant petroleum equipment for ocean deep water testing, and particularly relates to an underwater test tree.

Background

The deep water test operation generally adopts floating structures such as a semi-submersible drilling platform or a drilling ship, and due to the influence of wind, wave and current, the platform can generate floating body motions such as pitching and rolling, and a deep water test pipe column connected with the platform can also be seriously influenced, so that if special sea conditions such as typhoon or tide are met in the test process, the test pipe column needs to be immediately disconnected, and the platform is withdrawn from the well mouth. For the south China sea deepwater oil and gas exploration area, the environment is worse than that of other deepwater oil areas in the world, the testing difficulty is higher, the floating type platform is narrow in space and dense in equipment and personnel, and once blowout occurs or oil and gas flow led into the platform leaks in the testing process, serious accidents such as explosion, fire, poisoning, environmental pollution and the like can be caused. Therefore, deepwater oil and gas testing has high requirements on risk control, a critical device, namely an underwater test tree, installed on a test pipe column is required to be adopted in an emergency, the underwater test tree can enable the test pipe column to be quickly disconnected in the emergency, high-pressure oil and gas in a well are blocked, a drilling platform is quickly evacuated, and safety of personnel, equipment and the environment in the deepwater testing process is guaranteed.

The underwater test tree is one of the most typical and most critical devices in a deepwater oil and gas test system, is mainly applied to the stratum test and oil testing operation process carried out on a deepwater floating platform, and is often applied to shaft drainage and blowout replacement, underwater maintenance and other well repair operations. Whether applied to test operation or well repair operation, the underwater test tree plays the effect of safety protection, therefore also is called as the underwater safety valve.

At present, an underwater test tree used in deepwater test operation has a complex structure and poor reliability, so that an underwater test tree with a novel structure is needed to be provided.

Disclosure of Invention

In view of the above, the present invention provides an underwater test tree to solve the above-mentioned technical problems.

The technical scheme of the invention is as follows:

an underwater test tree comprising:

a latch portion;

a body part, one end of which is sleeved in the latch part;

the latch connecting structure is sleeved between the latch part and the body part, one end of the latch connecting structure is connected with the latch part, and the other end of the latch connecting structure is clamped with the body part;

and the control structure is arranged on the latch part and the body part and is used for controlling the action of the latch connecting structure so as to realize the connection or the separation of the latch part and the body part.

Further, the latching part comprises a fishing joint, a latching ring, a latching outer cylinder and a latching torque outer cylinder which are coaxially sleeved in sequence; a latch body sleeve is sleeved in the latch outer cylinder, the latch body sleeve is clamped with one side of the latch ring, which is far away from the fishing joint, a latch piston is sleeved between the latch body sleeve and the latch outer cylinder, a latch auxiliary piston is arranged in the latch piston, the latch auxiliary piston is positioned at one side close to the latch body sleeve, the latch body is fixedly connected in the latch body sleeve in a sleeved mode, a latch piston retainer ring is sleeved between the latch body and the latch piston and fixed with the latch body, a lifting valve sleeve and a lifting valve sleeve retainer ring are coaxially sleeved in the latch body and are positioned on one side of the latch body far away from the fishing joint, the lifting valve sleeve retainer ring and one side of the lifting valve sleeve, which is far away from the fishing joint, are clamped, and the lifting valve sleeve retainer ring is fixed with the latch body.

Further, this somatic part is including the promotion valve cap that coaxial suit set up in proper order, go up urceolus, urceolus and lower clutch down, it includes the fixed first drum of coaxial suit, first circular cone section of thick bamboo and second drum in proper order to go up the urceolus, the diameter of second drum is big than the diameter of first drum, be provided with the structure that clamps that matches with latch connection structure between first drum and the first circular cone section of thick bamboo, the one end that the second drum was kept away from to first drum with it is fixed to promote the valve cap, go up the suit poppet valve sleeve seat on the urceolus, poppet valve sleeve seat is located between first drum and the promotion valve barrel, establish ties in the space that first circular cone section of thick bamboo, second drum, lower urceolus and lower clutch enclose and be provided with first ball valve and the second ball valve that is used for controlling the well opening and shutting, first ball valve is close to one side setting of fishing joint.

Furthermore, the clamping structure comprises an annular special-shaped surface clamping ring, wherein two ends of the annular special-shaped surface clamping ring are respectively fixed with the first cylinder and the first conical cylinder, the outer contour line of the annular special-shaped surface clamping ring comprises a first oblique line, a first straight line section, a second oblique line and a second straight line section which are sequentially connected, the first oblique line is close to one side of the fishing joint, an acute angle is formed between the first oblique line and the second oblique line, and the diameter of an annular ring formed by surrounding the first straight line section is larger than that of an annular ring formed by surrounding the second straight line section.

Further, the latch coupling structure includes:

the latch claw lower seat ring is sleeved on the annular special-shaped surface clamp ring and is fixedly sleeved with the annular surface where the first oblique line section is located;

the latch claw ring is sleeved outside the latch claw lower seat ring and is hinged with the latch claw lower seat ring;

a plurality of latch claws evenly distributed on the latch claw ring and fixed with the latch claw ring, wherein the latch claws are clamped in the annular special-shaped surface clamping ring.

Further, the first ball valve includes:

the first ball seat is sleeved and fixed in the upper outer cylinder;

the first ball piston is sleeved outside the first ball seat;

the lower seat ring is sleeved in the first ball piston and positioned at one end departing from the first ball seat, a first ball support is sleeved and fixed at one end of the lower seat ring close to the first ball seat, first cambered surfaces are respectively arranged on the surfaces of the first ball support, which are opposite to the first ball seat, and form a first clamping groove structure, and a first ball is clamped in the first clamping groove structure; two first support arms are uniformly distributed on the first sphere support, the tail ends of the first support arms are second cambered surfaces, the second cambered surfaces are abutted with a rotating shaft of the first sphere to position the circle center of the first sphere, a first groove body which is eccentrically arranged is formed in the surface, close to the rotating shaft, of the first sphere, a first push rod is clamped in the first groove body, and the first push rod is fixed with a first sphere piston; a first elastic element is sleeved between the lower seat ring and the first spherical piston, and a plurality of second elastic elements are uniformly distributed between the lower seat ring and the first spherical support;

a first channel, one end of which is communicated with an external pressurizing device, and the other end of which is communicated with a first annular pressurizing cavity between the upper outer cylinder and the first ball piston through the latch body and the upper outer cylinder, and is used for pressurizing the first annular pressurizing cavity, so that the first ball piston is pushed to move, and the first ball valve is opened;

and one end of the second channel is communicated with external pressurizing equipment, and the other end of the second channel is communicated with a second annular pressurizing cavity among the upper outer cylinder, the lower seat ring and the first ball piston through the latch body and the upper outer cylinder and is used for pressurizing the second annular pressurizing cavity, so that the first ball piston is pushed to move reversely, and the first ball valve is closed.

Further, the second ball valve includes:

the second ball seat is sleeved and fixed in the lower seat ring;

the second ball piston is sleeved outside the second ball seat;

the lower spring bracket is sleeved in the second ball piston and positioned at one end departing from the second ball seat, a second ball support is sleeved and fixed at one end of the lower spring bracket close to the second ball seat, third cambered surfaces are respectively arranged on the surfaces of the second ball support, which are opposite to the second ball seat, two opposite third cambered surfaces form a second clamping groove structure, and a second ball is clamped in the second clamping groove structure; a cutting edge for cutting off the continuous oil pipe or the cable is arranged on the second ball body; two second support arms are uniformly distributed on the second sphere support, the tail end of each second support arm is a fourth cambered surface, the fourth cambered surface is abutted against a rotating shaft of the second sphere to position the circle center of the second sphere, a second groove body which is eccentrically arranged is formed in the surface, close to the rotating shaft, of the second sphere, a second push rod is clamped in the second groove body, and the second push rod is fixed with a second sphere piston; a third elastic piece is further sleeved between the lower spring bracket and the second spherical piston, and a plurality of fourth elastic pieces are uniformly distributed between the lower spring bracket and the second spherical support.

And one end of the third channel is communicated with external pressurizing equipment, and the other end of the third channel is communicated with a third annular pressurizing cavity between the lower outer cylinder and the second spherical piston through the latch body, the upper outer cylinder and the lower outer cylinder and is used for pressurizing the third annular pressurizing cavity, so that the second spherical piston is pushed to move, and the second ball valve is opened.

And one end of the fourth channel is communicated with external pressurizing equipment, and the other end of the fourth channel is communicated with a fourth annular pressurizing cavity among the lower outer cylinder, the lower spring bracket and the second ball piston through the latch body, the upper outer cylinder and the lower outer cylinder and is used for pressurizing the fourth annular pressurizing cavity, so that the second ball piston is pushed to move reversely, and the second ball valve is closed.

Further, the control structure includes:

a fifth passage, which is provided on the latch body, and one end of which is communicated with an external pressurizing device, and the other end of which is communicated with a fifth annular pressurizing cavity between the latch piston and the latch piston retainer ring, and is used for pressurizing the fifth annular pressurizing cavity, so as to push the latch piston to move, open the latch connecting structure, and separate the latch part from the body part;

and a sixth passage, one end of which is communicated with an external pressurizing device, and the other end of which is communicated with a sixth annular pressurizing cavity among the latch body sleeve, the latch piston and the latch auxiliary piston through the latch body, and is used for pressurizing the sixth annular pressurizing cavity so as to push the latch piston to move and connect the latch part and the body part.

Further, still include first chemical agent injection part, include:

the seventh channel is a mounting hole formed in one side, close to the fishing joint, of the latch body;

the check valve assembly is arranged in the seventh channel and comprises two check valves which are sequentially connected in series, and the input end of each check valve is connected with the chemical agent output end of the peripheral equipment and used for injecting a chemical agent into the latch body and the lifting valve cap.

Further, still include the second chemical agent injection part, include:

and one end of the eighth channel is connected with an external chemical agent output end, and the other end of the eighth channel is communicated with the inner cavity of the lower joint through the latch body, the upper outer cylinder and the lower outer cylinder.

Compared with the prior art, the underwater test tree provided by the invention is reliable in structure, has a double fault protection mechanism and controllable disconnection and connection functions, has a function of shearing a continuous oil pipe or a cable, a function of injecting a chemical agent, a mechanical unlatching function and a pumping function, is complete in function, extremely strong in risk control performance and strong in practicability, and is worthy of popularization.

Drawings

FIG. 1 is a cross-sectional view 1 of a body construction of the present invention;

FIG. 2 is a cross-sectional view 2 of the body construction of the present invention;

FIG. 3 is a cross-sectional view 3 of the body construction of the present invention;

FIG. 4 is a cross-sectional view 4 of the body construction of the present invention;

FIG. 5 is a left side view of the body construction of the present invention;

FIG. 6 is a cross-sectional view 5 of the body construction of the present invention;

FIG. 7 is a cross-sectional view 6 of the body construction of the present invention;

FIG. 8 is a cross-sectional view 7 of the body construction of the present invention;

FIG. 9 is a schematic connection diagram 1 of a partial structure of the present invention;

FIG. 10 is a schematic connection diagram of a partial structure of the present invention 2;

FIG. 11 is a partial block diagram of the present invention in FIG. 1;

fig. 12 is a partial block diagram of the present invention in fig. 2.

Detailed Description

The invention provides an underwater test tree, which is described below by combining the structural schematic diagrams of fig. 1 to 12.

Example 1

The invention provides an underwater test tree, which comprises a latch part and a body part, wherein one end of the body part is sleeved in the latch part, a latch connecting structure is sleeved between the latch part and the body part, one end of the latch connecting structure is connected with the latch part, and the other end of the latch connecting structure is clamped with the body part; the control structure is arranged on the latching part and the body part and is used for controlling the action of the latching connection structure so as to realize the connection or separation of the latching part and the body part.

Further, the structure of the latch specifically includes:

the fishing joint 1, the latching ring 3, the latching outer cylinder 6 and the latching torque outer cylinder 10 are coaxially sleeved in sequence, and the fishing joint 1 and the latching ring 3 are connected through threads.

A latch body sleeve 4 is sleeved in the latch outer cylinder 6, the latch body sleeve 4 and one side of the latch ring 3, which is far away from the fishing joint 1, are clamped, a latch piston 7 is sleeved between the latch body sleeve 4 and the latch outer cylinder 6, a latch auxiliary piston 11 is sleeved in the latch piston 7, the latch auxiliary piston 11 is positioned at one side close to the latch body sleeve 4, a latch body 2 is fixedly connected in the latch body sleeve 4, a latch piston retainer ring 13 is sleeved between the latch body 2 and the latch piston 7, the latch piston retainer ring 13 is fixed with the latch body 2, a lifting valve sleeve 8 and a lifting valve sleeve retainer ring 14 are coaxially sleeved in the latch body 2, the lifting valve sleeve 8 and the lifting valve sleeve retainer ring 14 are positioned at one side of the latch body 2, which is far away from the fishing joint 1, the lifting valve sleeve retainer ring 14 and one side of the lifting valve sleeve 8, which is far away from the fishing joint 1, are clamped, and the lifting valve sleeve retainer ring 14 and the latch body 2 are fixed.

Further, the structure of the body specifically includes:

the lifting valve cap 5 that coaxial suit set up in proper order, go up urceolus 12, urceolus 27 and lower clutch 31 down, it includes the fixed first drum of coaxial suit in proper order to go up urceolus 12, first circular cone section of thick bamboo and second drum, the diameter of second drum is big than the diameter of first drum, be provided with the structure that clamps that matches with latch connection structure between first drum and the first circular cone section of thick bamboo, the one end that the second drum was kept away from to first drum is fixed with lifting valve cap 5, go up the suit poppet valve sleeve seat 9 on urceolus 12, poppet valve sleeve seat 9 is located between first drum and the poppet valve cover 8, first circular cone section of thick bamboo, the second drum, it is provided with first ball valve and the second ball valve that is used for controlling the switch well to concatenate in the space that urceolus 27 and lower clutch 31 enclose, first one side that is close to salvage and connects 1 sets up.

Wherein, the first ball valve and the second ball valve are in a normally closed state in the process of descending the well.

Furthermore, the clamping structure comprises an annular special-shaped surface clamping ring, two ends of the annular special-shaped surface clamping ring are respectively fixed with the first cylinder and the first conical cylinder, the outer contour line of the annular special-shaped surface clamping ring comprises a first oblique line, a first straight line section, a second oblique line and a second straight line section which are sequentially connected, the first oblique line is close to one side of the fishing joint 1, an acute angle is formed between the first oblique line and the second oblique line, and the diameter of an annular ring formed around the first straight line section is larger than that of an annular ring formed around the second straight line section.

Further, the structure of the latch connection structure specifically includes:

the locking device comprises a locking claw lower seat ring 15 sleeved on an annular special-shaped surface clamping ring, wherein the locking claw lower seat ring 15 is fixedly sleeved on an annular surface where a first oblique line section is located, a locking claw ring 16 is sleeved outside the locking claw lower seat ring 15, the locking claw ring 16 is hinged with the locking claw lower seat ring 15, a plurality of locking claws 17 are uniformly distributed on the locking claw ring 16, the locking claws 17 are fixed with the locking claw ring 16, and the locking claws 17 are clamped in the annular special-shaped surface clamping ring.

Further, the structure of the first ball valve specifically includes:

a first ball seat 181 fixed in the upper outer cylinder 12 in a sleeved mode, a first ball piston 191 is sleeved outside the first ball seat 181, a lower seat ring 25 is sleeved in the first ball piston 191, the lower seat ring 25 is located at one end away from the first ball seat 181, a first ball support 211 is fixed at one end, close to the first ball seat 181, of the lower seat ring 25 in a sleeved mode, first arc surfaces are respectively arranged on the surfaces, opposite to the first ball seat 181, of the first ball support 211, two opposite first arc surfaces form a first clamping groove structure, and a first ball 20 is clamped in the first clamping groove structure; two first support arms are uniformly distributed on the first sphere support 211, the tail ends of the first support arms are second cambered surfaces, the second cambered surfaces are abutted with the rotating shaft of the first sphere 20 to position the circle center of the first sphere 20, the surface, close to the rotating shaft, of the first sphere 20 is provided with a first groove body which is eccentrically arranged, a first push rod is clamped in the first groove body, and the first push rod is fixed with a first sphere piston 191; a first elastic element 241 is further sleeved between the lower seat ring 25 and the first ball piston 191, and a plurality of second elastic elements 221 are uniformly arranged between the lower seat ring 25 and the first ball support 211.

Wherein the first elastic member 241 is a coil spring.

A first passage, as shown in fig. 1, one end of which communicates with an external pressurizing device and the other end of which communicates with a first annular pressurizing chamber between the upper outer cylinder 12 and the first ball piston 191 via the latch body 2, the upper outer cylinder 12, and is used for pressurizing the first annular pressurizing chamber, thereby pushing the first ball piston 191 to move and opening the first ball valve; specifically, pressurization from the first passage shown in fig. 1, i.e., the passage on the lower side in fig. 1, via an external pressurization device, drives the first ball piston 191 downward, compressing the first resilient member 241 and rotating the first ball 20 to the open position, opening the first ball valve.

The second passage, as shown in fig. 2, has one end communicating with an external pressurizing device and the other end communicating with a second annular pressurizing chamber between the upper outer cylinder 12, the lower seat ring 25 and the first ball piston 191 via the latch body 2, the upper outer cylinder 12, and the second annular pressurizing chamber for pressurizing the second annular pressurizing chamber, thereby pushing the first ball piston 191 to move reversely and closing the first ball valve.

Specifically, pressurization from the second passage shown in fig. 2, i.e., the passage on the lower side in fig. 2, via an external pressurization device drives the first ball piston 191 to move upward, releases the first elastic member 241, and rotates the first ball 20 to the closed position.

As shown in fig. 12, the first ball 20 has a strip-shaped groove and a central shaft, and one end of the first rotating pin 32 is disposed in the strip-shaped groove for rotating the first ball 20 to open and close.

Specifically, as shown in fig. 6, a connection cross-sectional view of the first ball 20, the first ball piston 191, the first rotation pin 32, and the first rotation pin locking cap 33 is shown, wherein the lower end surface of the first rotation pin locking cap 33 is limited on the bottom surface of the counterbore of the first ball piston 191. First rotatory round pin 32 passes through threaded connection with first rotatory round pin locking cap 33, and the terminal surface is spacing in first spheroid piston 191 counter bore bottom surface under first rotatory round pin locking cap 33, and the one end excircle of first rotatory round pin 32 is arranged in first spheroid piston 191, and the other end is spacing in the bar groove of first spheroid 20, and first spheroid piston 191 up-and-down motion drives first rotatory round pin 32 along with it and moves, stirs first spheroid 20 rotation and opens and close.

In order to increase the sealing effect, a sealing structure is provided on the first rotation pin 32.

Wherein the sealing structure comprises a support seal 84 and a sealing ring 83 coaxially sleeved on the first rotating pin 32 in turn, and the sealing ring 83 is preferably an O-ring.

Wherein, the first ball seat 181 is connected with the upper outer cylinder 12 by screw thread.

The first elastic member 241 is preferably a spring, and the first elastic member 241 is fixed between the first ball piston 191 and the lower race 25.

Wherein, the first ball piston 191 moves downwards and is limited by the lower seat ring 25, and moves upwards and is limited by the upper outer cylinder 12. The excircle end face of the left step of the lower seat ring 25 is limited on the end face of the inner hole of the upper outer cylinder 12, and the right end is limited on the left end face of the lower outer cylinder 27.

Wherein, a first split ring 26 is arranged between the lower outer cylinder 27 and the upper outer cylinder 12, and the first split ring 26 is sleeved on the excircle of the lower outer cylinder 27 and is positioned in the inner hole groove of the upper outer cylinder 12.

As shown in fig. 3, the lower outer cylinder 27 is connected to the upper outer cylinder 12 by a screw thread, and is provided with a first ball stud 421, and the first ball stud 421 is used for preventing relative rotation between the lower outer cylinder 27 and the upper outer cylinder 12.

Wherein, the inner hole groove of the lower outer cylinder 27 is sleeved with a second split ring 30, and the second split ring 30 is sleeved on the outer circular surface of the inner boss of the lower joint 31.

As shown in fig. 3, the lower outer cylinder 27 is connected to the lower joint 31 by a screw, and a second ball stud 42 is provided on the circumference of the lower outer cylinder 27, and the second ball stud 42 is abutted on the lower outer cylinder 27 by its lower end surface after passing through the lower joint 31 for preventing relative rotation between the lower outer cylinder 27 and the lower joint 31.

Further, the structure of the second ball valve specifically includes:

the second ball seat 18 is sleeved and fixed in the lower seat ring 25, the second ball piston 19 is sleeved and fixed on the outer side of the second ball seat 18, the lower spring bracket 29 is sleeved and fixed in the second ball piston 19, the lower spring bracket 29 is positioned at one end away from the second ball seat 18, the end, close to the second ball seat 18, of the lower spring bracket 29 is sleeved and fixed with the second ball support 21, third cambered surfaces are respectively arranged on the surfaces, opposite to the second ball seat 18, of the second ball support 21, two opposite third cambered surfaces form a second clamping groove structure, and a second ball 28 is clamped and fixed in the second clamping groove structure; a cutting edge for cutting off the continuous oil pipe or the cable is arranged on the second sphere 28; two second support arms are uniformly distributed on the second sphere support 21, the tail ends of the second support arms are fourth cambered surfaces, the fourth cambered surfaces are abutted with a rotating shaft of the second sphere 28 to position the circle center of the second sphere 28, a second groove body which is eccentrically arranged is arranged on the surface, close to the rotating shaft, of the second sphere 28, a second push rod is clamped in the second groove body, and the second push rod is fixed with a second sphere piston 19; a third elastic element 24 is sleeved between the lower spring bracket 29 and the second ball piston 19, and a plurality of fourth elastic elements 22 are uniformly arranged between the lower spring bracket 29 and the second ball support 21.

Wherein the third elastic member 24 is a coil spring.

A third channel, as shown in fig. 1, one end of which is communicated with an external pressurizing device, and the other end of which is communicated with a third annular pressurizing cavity between the lower outer cylinder 27 and the second ball piston 19 via the latch body 2, the upper outer cylinder 12 and the lower outer cylinder 27, and is used for pressurizing the third annular pressurizing cavity, so as to push the second ball piston 19 to move and open the second ball valve;

in particular, pressurisation from the third passage shown in figure 1, i.e. the upper passage in figure 1, via an external pressurising device drives the second ball piston 19 downwards, compressing the third resilient member 24 and rotating the second ball 28 to an open position, opening the second ball valve.

And a fourth passage, as shown in fig. 2, having one end communicating with an external pressurizing device and the other end communicating with a fourth annular pressurizing chamber between the lower outer cylinder 27, the lower spring bracket 29 and the second ball piston 19 via the latch body 2, the upper outer cylinder 12 and the lower outer cylinder 27, for pressurizing the fourth annular pressurizing chamber, thereby pushing the second ball piston 19 to move reversely and closing the second ball valve.

Specifically, pressurization from the fourth passage shown in fig. 2, i.e., the upper passage in fig. 2, via an external pressurization device drives the second ball piston 19 to move upward, releasing the third resilient member 24 and rotating the second ball 28 to the closed position.

As shown in fig. 11, the second sphere 28 has a strip-shaped groove, and one end of the second rotating pin is located in the strip-shaped groove for turning the second sphere 28 to open or close. The second sphere 28 is further provided with a notch structure, the notch structure is used for abdicating, and the other side of the second sphere 28 is provided with a cutting edge which is a cutting edge for cutting off the continuous oil pipe or the cable.

The second ball seat 18 is in threaded connection with the lower seat ring 25, the second rotating pin is in threaded connection with the second rotating pin locking cap, and the lower end face of the second rotating pin locking cap is limited on the bottom face of the counter bore of the second ball piston 19. The excircle of one end of the second rotating pin is positioned in the hole of the second sphere piston 19, the other end of the second rotating pin is limited in the strip-shaped groove of the second sphere 28, the second sphere piston 19 moves up and down, the second rotating pin moves along with the second rotating pin, and the second sphere 28 is stirred to rotate, open and close.

Wherein the third resilient member 24 is trapped between the lower spring carrier 29 and the second ball piston 19. The second ball piston 19 is restrained from downward movement by the lower spring bracket 29 and restrained from upward movement by the lower race 25. The excircle end face of the step at the left end of the lower seat ring 25 is limited at the end face of the inner hole of the upper outer cylinder 12, and the right end is limited at the left end face of the lower outer cylinder 27.

Further, the structure of the control structure specifically includes:

as shown in fig. 4, a fifth passage is opened on the latch body 2 for disconnecting the latch passage, one end of the fifth passage is communicated with an external pressurizing device, and the other end is communicated with a fifth annular pressurizing cavity between the latch piston 7 and the latch piston retainer 13 for pressurizing the fifth annular pressurizing cavity, thereby pushing the latch piston 7 to move, opening the latch connection structure, and separating the latch part from the body part.

Pressurization from the fifth passage shown in fig. 4, i.e., the passage on the lower side in fig. 4, via an external pressurization device, pushes the latch auxiliary piston 11 and the latch piston 7 upward, releasing the latch claw 17. The latching claw 17 is opened to be separated from the upper outer cylinder 12, and at the moment, the fishing joint 1, the latching body 2, the latching ring 3, the latching body sleeve 4, the latching outer cylinder 6, the latching piston 7, the lifting valve sleeve 8, the latching torque outer cylinder 10, the latching auxiliary piston 11, the latching piston retaining ring 13, the lifting valve sleeve retaining ring 14, the lower seat ring of the latching claw 15, the latching claw ring 16 and the latching claw 17 can be lifted out of the well, so that the latching of the upper latching mechanism and the following mechanisms is realized.

As shown in fig. 3, the sixth passage is a passage on the lower side of fig. 3, one end of the sixth passage is communicated with an external pressurizing device, and the other end is communicated with a sixth annular pressurizing cavity among the latch body sleeve 4, the latch piston 7 and the latch auxiliary piston 11 via the latch body 2, and is used for pressurizing the sixth annular pressurizing cavity, so that the latch piston 7 is pushed to move, and the latch part and the body part are connected.

In use, pressure is applied from the sixth channel shown in figure 3 via an external pressure device, pushing the latch auxiliary piston 11 and the latch piston 7 downwards, covering the latch pawl 17. The latch claw 17 contracts and embraces the upper outer cylinder 12, and the upper latch mechanism is connected to the following mechanism.

Further, the chemical agent injection device further comprises a first chemical agent injection part, and the structure specifically comprises:

a seventh passage, as shown in fig. 3, is provided at one side of the latch body 2 close to the fishing joint 1, a check valve assembly 43 is provided in the seventh passage, the check valve assembly 43 includes two check valves connected in series in sequence, and an input end of the check valve is connected with an external chemical agent output end for injecting the chemical agent between the latch body 2 and the lifting valve cap 5.

Wherein the seventh passage is a passage on the upper side as shown in fig. 3, the seventh passage is connected to the upper end of the first ball valve, and chemical can be injected to a position above the first ball valve. A check valve assembly 43 of two check valves is designed at the injection port to prevent the chemical agent from flowing back and the oil gas in the well bore from leaking out of the injection port.

Wherein the first chemical injection portion includes a one-way valve assembly 43 and a plug 38, the plug 38 being threadably connected to the latch body 2, trapping the one-way valve assembly 43 in the latch body seventh passage.

The check valve assembly 43 includes two identical sets of check valves disposed in series in the seventh passage. The check valve consists of a valve seat 85, a valve core 86, a spring 87, a spacer ring 88 and a retainer ring 89.

Wherein the retainer ring 89 is a 90O-ring.

As shown in fig. 10, the valve core 86 is installed in the inner hole of the valve seat 85, the left end conical surface of the valve core 86 is tightly attached to the inner hole conical surface of the valve seat 85 under the elastic force of the spring 87, the conical surface of the valve core 86 is lathed with a sealing groove, a 90O-ring is installed in the sealing groove of the valve core 86 to realize sealing, the upper end of the spring 87 is located in the inner hole of the valve core 86, the lower end of the spring is located in the inner hole of the spacer ring 88, the lower end of the spacer ring 88 is tightly attached to the retainer ring 89 under the elastic force of the spring 87, and the retainer ring 89 is installed in the annular groove of the inner hole of the valve seat 85.

Further, still include the second chemical agent injection part, its structure specifically includes:

as shown in fig. 4, the eighth channel, i.e. the upper channel in fig. 4, has one end connected to the chemical agent output end of the external device and the other end communicated with the inner cavity of the lower joint 31 and the lower joint 31 via the latch body 2, the upper outer cylinder 12, the lower outer cylinder 27, and the lower joint 31, so that the channel injects the chemical agent below the second sphere to prevent the formation of hydrate.

As shown in fig. 5, the relative positions of the 8 channels of the device are shown, where:

6 denotes a first channel, i.e. a first sphere-opening channel, as shown in fig. 1;

1 represents a third channel, i.e. the second sphere opens the channel, as shown in fig. 1;

7 denotes a second passage, i.e. a first ball-closing passage, as shown in fig. 2;

2 denotes a fourth passage, i.e. a second ball-closing passage, as shown in fig. 2;

8 represents a seventh channel, i.e., an upper chemical injection channel, as shown in fig. 3;

4 represents a sixth channel, namely a latch connection channel, as shown in fig. 3;

5 represents the fifth channel, i.e. the unlatching channel, as shown in FIG. 4;

and 3 represents an eighth channel, i.e. a downhole chemical injection channel, as shown in fig. 4.

In normal non-use conditions, the entrance to each channel may be sealed off using a plug 34 to protect the channel.

Wherein, the threaded connection department of salvaging the joint 1 and the latch ring 3 is provided with a set screw 35, the reason for setting the set screw 35 lies in:

when the mechanical bolt is released, the right-handed bolt body 2 is needed to be rotated, the left-handed thread between the bolt outer cylinder 6 and the bolt torque outer cylinder 10 is released, the torque is transmitted through the right-handed bolt body 2, and the right-handed bolt cannot be released at the position, so that a set screw 35 is arranged at the threaded connection position for preventing the right-handed thread on the bolt body 2 from being released from the position.

The set screw 35 is preferably a headless screw, and a flat slot is formed in the end face of the headless screw, so that the operation is facilitated.

Wherein, the latch ring 3 and the latch outer cylinder 6, the latch body sleeve 4 and the latch body 2 are all connected through screw threads.

As shown in fig. 7, fig. 7 is a cross-sectional view showing the connection between the latch ring 3, the latch body cover 4, the latch outer cylinder 6, and the latch body 2, and the connection between the latch torque outer cylinder 10 and the latch outer cylinder 6. A torque transmission pin 36 is inserted between the latch ring 3, the latch body sleeve 4, the latch outer cylinder 6 and the latch body 2. After the torque transmission pin 36 respectively passes through the cylindrical strip-shaped hole of the step at the left end of the latch outer cylinder 6 and the mounting hole on the latch body sleeve 4, the lower end surface of the torque transmission pin is in contact with the cylindrical strip-shaped groove surface on the latch body 2 for limiting, the latch ring 3, the latch body sleeve 4 and the latch outer cylinder 6 are fixed, when a right-hand thread on the latch body 2 is released for carrying out latch releasing operation, the latch body sleeve 4 is prevented from rotating, and the left end surface of the latch body sleeve 4 is limited on the latch ring 3.

The latch piston 7 is arranged in an inner hole of the latch outer cylinder 6, is limited downwards by the left end face of the latch piston retainer ring 13, moves upwards to the left end face of the excircle of the right end step of the latch body sleeve 4 for limitation, the latch auxiliary piston 11 is arranged in the inner hole of the left end of the latch piston 7, is limited downwards on the right end face of the left end step hole of the latch piston 7, is limited upwards on the latch body sleeve 4, and the initial installation position of the latch piston 7 is the cross-sectional position shown in the drawing A-A.

In order to improve the sealing performance, O-rings are arranged between the lifting valve cap 5 and the latch body 2, between the latch auxiliary piston 11 and the latch piston 7 and between the latch auxiliary piston 11 and the latch body 2, and because the device is balanced in stress in the process of going down the well, the upward movement of the latch piston 7 needs to overcome the friction force of the O-rings, so that the upward movement cannot exist.

As shown in fig. 7, the latching torque outer cylinder 10 is connected with the latching outer cylinder 6 through left-hand threads, a latching shear pin 37 is arranged at the joint of the latching torque outer cylinder 10 and the latching outer cylinder 6, a threaded through hole is formed in the latching torque outer cylinder 10, a strip-shaped groove is formed in the latching outer cylinder 6, and the latching shear pin 37 is screwed on the latching torque outer cylinder 10 and penetrates through the threaded hole to enter the strip-shaped groove of the latching outer cylinder 6. The latching shear pin 37 is used to provide a protective function for the right-hand string to be unlatched, preventing accidental tripping.

As shown in fig. 8, fig. 8 is a sectional view showing the connection between the latching torque outer cylinder 10 and the latching outer cylinder 6. The connection part of the latching torque outer cylinder 10 and the latching outer cylinder 6 is provided with an inner hexagonal screw 39 for connection, a threaded hole is formed in the latching torque outer cylinder 10, the inner hexagonal screw 39 is connected with the latching torque outer cylinder 10 through threads, the lower end of the inner hexagonal screw 39 enters an outer circular groove of the latching outer cylinder 6 to ensure that the latching outer cylinder 6 moves upwards after being loosened for a certain distance, the outer circular groove on the latching outer cylinder is limited by the inner hexagonal screw 39 and cannot move upwards continuously and be completely separated, and the latching outer cylinder and the upper part of the latching outer cylinder can be lifted out of a well together after being released.

Wherein, be equipped with the internal thread on the latch piston retaining ring 13, set up the external screw thread on the latch body 2, latch piston retaining ring 13 passes through threaded connection with latch body 2 and fixes.

Wherein the lift sleeve collar 14 is threadedly connected to the latch body 2 and secures the lift sleeve 8 in the latch body 2.

Fig. 9 is a schematic view showing the connection of the lower race of the latch claw 15, the latch claw ring 16, the latch claw 17, and the upper outer cylinder 12, as shown in fig. 9. The conical surface of the lower end of the lower seat ring of the latch claw 15 is attached to and limited by the conical surface of the upper outer cylinder 12, the latch claw ring 16 is of an open structure, penetrates through an arc groove of the latch claw ring 16, and is fixedly connected with the latch claw 17, and the latch claw 17 tightly holds the upper outer cylinder 12, so that the connection between a latch part and a body part is realized.

Wherein, the lifting valve cap 5 is connected with the upper outer cylinder 12 through screw threads, the lifting valve sleeve seat 9 is sleeved on the excircle of the upper outer cylinder 12 and is fixed by the lifting valve sleeve 8, the upper outer cylinder 12 is connected with the lower outer cylinder 27 through screw threads, and the lower outer cylinder 27 is connected with the lower connector 31 through screw threads.

The invention has the function of a ball valve, and is a double fault protection mechanism, the first ball valve and the second ball valve are in a normally closed state in the process of descending the well, the first ball body 20 pushes the first ball body piston 191 to move upwards under the action of the elastic force of the first elastic element 241, the first rotating pin 32 on the first ball body moves upwards along with the upwards movement, and the first ball body 20 is stirred to be in a closed state, so that the failure protection effect is realized; the second ball 28 pushes the second ball piston 19 to move upward under the elastic force of the third elastic element 24, and the second rotating pin moves upward to toggle the second ball 28 to be in a closed state, thereby playing a role of fail-safe. In addition, the first ball valve and the second ball valve are protection valves which can be respectively and independently closed/opened, and have double controllable protection characteristics.

The invention has the following beneficial effects:

the invention has controllable disconnecting and connecting functions, adopts a hydraulic control mode to control the latch connecting mechanism at the upper end of the underwater test tree to quickly disconnect and connect the test pipe column, and requires to immediately disconnect the test pipe column and withdraw the platform from the wellhead position when meeting special sea conditions such as typhoon or tide. When the latch connection mechanism is disconnected, the pressure is required to be applied from the fifth channel at the upper end, the latch piston is pushed to move upwards, the latch claw is opened, the device is lifted upwards, and therefore the fishing joint 1, the latch body 2, the latch ring 3, the latch body sleeve 4, the latch outer cylinder 6, the latch piston 7, the lifting valve sleeve 8, the latch torque outer cylinder 10, the latch auxiliary piston 11, the latch piston retainer ring 13, the lifting valve sleeve retainer ring 14, the lower seat ring of the latch claw 15, the latch claw ring 16 and the latch claw 17 are lifted out, and the rest of the device is left at the bottom of the well. Pressurizing from the sixth channel at the upper end, pushing the latch piston to move downwards, limiting the latch claw to open, lifting the device, and lifting the underwater test tree and other devices below to the ground.

In addition, the second ball valve has a shearing function, and as the second ball body 28 is provided with shearing cutting edges, the second ball valve can be controlled by a platform control system through a hydraulic pipe line to act in the closing process of the second ball valve, so that the coiled tubing can be sheared. The second ball valve is closed from the fourth passage under pressure and the coiled tubing is sheared.

In addition, the underwater test tree has the function of injecting the chemical agent, and the upper end of the underwater test tree is provided with a seventh channel and an eighth channel of two chemical agent injection ports. The seventh channel is connected to the upper end of the first ball valve, chemical agent can be injected to a position above the first ball valve, and two one-way valve assemblies are designed at the injection port of the underwater test tree shell to prevent the chemical agent from flowing back and oil gas in a shaft from leaking from the injection port; an eighth passage injects chemical agent below the second ball to prevent hydrate formation, and an eighth passage is connected below the second ball valve and can inject chemical agent below the test string. In underwater gas wells, hydrates are easily formed due to low deepwater temperatures, and in order to prevent hydrate formation, it is usually necessary to inject a chemical agent such as methanol.

In addition, the invention has the function of mechanical release, and the underwater test tree can be directly controlled to break and block oil gas through a hydraulic pipeline in the operation control process. When the hydraulic pipeline fails, the method of rotating the pipe column rightwards to cut the latch shear pin 37 can be used for unlocking and disconnecting, the underwater test tree is driven through the high pressure of the annulus, and the high-pressure oil gas in the pipe column is blocked forcibly.

The invention has the pumping function, when the underwater test tree is closed and cannot be opened due to loss of hydraulic drive or objective factors, the pumping can be realized under the action of certain positive pressure, the positive pressure value is adjustable, and the function can be applied to the process of reducing the hydraulic pressure in a shaft and discharging high-pressure oil gas.

The appearance outlines and installation positions of the underwater test tree, the flow-bearing valve and the like are effectively matched with annular and semi-closed ram blowout preventers in an underwater blowout preventer group, so that the test equipment can be prevented from being damaged in the closing process of the blowout preventers, and high-pressure oil gas in annular space can be tightly blocked.

The above disclosure is only for the preferred embodiments of the present invention, but the embodiments of the present invention are not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.

Claims

1. An underwater test tree, comprising:

a latch portion;

a body part, one end of which is sleeved in the latch part;

2. The underwater test tree of claim 1, wherein the latching part comprises a fishing joint (1), a latching ring (3), a latching outer cylinder (6) and a latching torque outer cylinder (10) which are coaxially sleeved in sequence; a latch body sleeve (4) is sleeved in the latch outer cylinder (6), a latch piston (7) is sleeved between the latch body sleeve (4) and the latch ring (3) and clamped on one side departing from the fishing joint (1), a latch auxiliary piston (11) is sleeved in the latch piston (7), the latch auxiliary piston (11) is positioned on one side close to the latch body sleeve (4), a latch body (2) is fixedly connected in the latch body sleeve (4), a latch piston retainer ring (13) is sleeved between the latch body (2) and the latch piston (7), the latch piston retainer ring (13) is fixed with the latch body (2), a lifting valve sleeve (8) and a lifting valve sleeve retainer ring (14) are coaxially sleeved in the latch body (2), the lifting valve sleeve (8) and the lifting valve sleeve check ring (14) are located on one side, away from the fishing joint (1), of the latch body (2), the lifting valve sleeve check ring (14) is clamped with one side, away from the fishing joint (1), of the lifting valve sleeve (8), and the lifting valve sleeve check ring (14) is fixed with the latch body (2).

3. The underwater test tree as claimed in claim 1, wherein the body portion comprises a lifting valve cap (5), an upper outer cylinder (12), a lower outer cylinder (27) and a lower joint (31) which are coaxially sleeved in sequence, the upper outer cylinder (12) comprises a first cylinder, a first conical cylinder and a second cylinder which are coaxially sleeved and fixed in sequence, the diameter of the second cylinder is larger than that of the first cylinder, a clamping structure matched with a latch connecting structure is arranged between the first cylinder and the first conical cylinder, one end of the first cylinder, far away from the second cylinder, is fixed with the lifting valve cap (5), a lifting valve sleeve seat (9) is sleeved on the upper outer cylinder (12), the lifting valve sleeve seat (9) is positioned between the first cylinder and the lifting valve sleeve (8), and a first ball valve and a second ball valve which are used for controlling opening and closing of a well are arranged in series in a space surrounded by the first conical cylinder, the second cylinder, the lower outer cylinder (27) and the lower joint (31), the first ball valve is arranged close to one side of the fishing joint (1).

4. An underwater test tree as claimed in claim 3, wherein the clamping structure comprises an annular profiled surface collar fixed at two ends to the first cylinder and the first conical cylinder respectively, the outer profile line of the annular profiled surface collar comprises a first oblique line, a first straight line section, a second oblique line and a second straight line section which are connected in sequence, the first oblique line is close to one side of the fishing joint (1), an acute angle is formed between the first oblique line and the second oblique line, and the diameter of the annular ring formed around the first straight line section is larger than that of the annular ring formed around the second straight line section.

5. The subsea test tree of claim 4, wherein the latch connection structure comprises:

the lower seat ring (15) of the latch claw is sleeved on the annular special-shaped surface and is sleeved and fixed with the annular surface where the first oblique line section is located;

the latch claw ring (16) is sleeved outside the latch claw lower seat ring (15) and is hinged with the latch claw lower seat ring (15);

a plurality of latching claws (17) are uniformly distributed on the latching claw ring (16) and fixed with the latching claw ring (16), and the latching claws (17) are clamped in the annular special-shaped surface clamping ring.

6. The subsea test tree of claim 3, wherein the first ball valve comprises:

a first ball seat (181) which is fixed in the upper outer cylinder (12) in a sleeved manner;

the first ball piston (191) is sleeved outside the first ball seat (181);

the lower seat ring (25) is sleeved in the first ball piston (191) and is positioned at one end departing from the first ball seat (181), one end, close to the first ball seat (181), of the lower seat ring (25) is fixedly sleeved with a first ball support (211), the surfaces, opposite to the first ball seat (181), of the first ball support (211) are respectively provided with a first arc surface, the two opposite first arc surfaces form a first clamping groove structure, and a first ball (20) is clamped in the first clamping groove structure; two first support arms are uniformly distributed on the first sphere support (211), the tail ends of the first support arms are second arc surfaces, the second arc surfaces are abutted to a rotating shaft of the first sphere (20) to position the circle center of the first sphere (20), a first groove body which is eccentrically arranged is formed in the surface, close to the rotating shaft, of the first sphere (20), a first push rod is clamped in the first groove body, and the first push rod is fixed with a first sphere piston (191); a first elastic piece (241) is sleeved between the lower seat ring (25) and the first ball piston (191), and a plurality of second elastic pieces (221) are uniformly distributed between the lower seat ring (25) and the first ball support (211);

a first channel, one end of which is communicated with an external pressurizing device, and the other end of which is communicated with a first annular pressurizing cavity between the upper outer cylinder (12) and a first ball piston (191) through the latch body (2) and the upper outer cylinder (12), and is used for pressurizing the first annular pressurizing cavity, so that the first ball piston (191) is pushed to move, and a first ball valve is opened;

and one end of the second channel is communicated with external pressurizing equipment, and the other end of the second channel is communicated with a second annular pressurizing cavity among the upper outer cylinder (12), the lower seat ring (25) and the first ball piston (191) through the latch body (2) and the upper outer cylinder (12) and is used for pressurizing the second annular pressurizing cavity, so that the first ball piston (191) is pushed to move reversely, and the first ball valve is closed.

7. The subsea test tree of claim 5, wherein the second ball valve comprises:

a second ball seat (18) which is sleeved and fixed in the lower seat ring (25);

the second ball piston (19) is sleeved outside the second ball seat (18);

the lower spring bracket (29) is sleeved in the second ball piston (19) and is positioned at one end departing from the second ball seat (18), one end, close to the second ball seat (18), of the lower spring bracket (29) is fixedly sleeved with a second ball support (21), the surfaces, opposite to the second ball seat (18), of the second ball support (21) are respectively provided with a third arc surface, the two opposite third arc surfaces form a second clamping groove structure, and a second ball (28) is clamped in the second clamping groove structure; a cutting edge for cutting off the continuous oil pipe or the cable is arranged on the second sphere (28); two second support arms are uniformly distributed on the second sphere support (21), the tail ends of the second support arms are fourth arc surfaces, the fourth arc surfaces are abutted against a rotating shaft of the second sphere (28) to position the circle center of the second sphere (28), a second groove body which is eccentrically arranged is formed in the surface, close to the rotating shaft, of the second sphere (28), a second push rod is clamped in the second groove body, and the second push rod is fixed with a second sphere piston (19); a third elastic element (24) is sleeved between the lower spring bracket (29) and the second ball piston (19), and a plurality of fourth elastic elements (22) are uniformly distributed between the lower spring bracket (29) and the second ball support (21);

a third channel, one end of which is communicated with external pressurizing equipment, and the other end of which is communicated with a third annular pressurizing cavity between the lower outer cylinder (27) and the second ball piston (19) through the latch body (2), the upper outer cylinder (12) and the lower outer cylinder (27), and is used for pressurizing the third annular pressurizing cavity, so that the second ball piston (19) is pushed to move, and a second ball valve is opened;

and one end of the fourth channel is communicated with external pressurizing equipment, and the other end of the fourth channel is communicated with a fourth annular pressurizing cavity among the lower outer cylinder (27), the lower spring bracket (29) and the second ball piston (19) through the latch body (2), the upper outer cylinder (12) and the lower outer cylinder (27) and is used for pressurizing the fourth annular pressurizing cavity, so that the second ball piston (19) is pushed to move reversely, and the second ball valve is closed.

8. The subsea test tree of claim 1, wherein the control structure comprises:

a fifth channel, which is opened on the latch body (2), one end of which is communicated with an external pressurizing device, and the other end of which is communicated with a fifth annular pressurizing cavity between the latch piston (7) and a latch piston retainer ring (13), and is used for pressurizing the fifth annular pressurizing cavity, so that the latch piston (7) is pushed to move, a latch connecting structure is opened, and the latch part is separated from the body part;

and a sixth channel, one end of which is communicated with an external pressurizing device, and the other end of which is communicated with a sixth annular pressurizing cavity among the latch body sleeve (4), the latch piston (7) and the latch auxiliary piston (11) through the latch body (2), and is used for pressurizing the sixth annular pressurizing cavity so as to push the latch piston (7) to move and connect the latch part and the body part.

9. The subsea test tree of claim 1, further comprising a first chemical injection comprising:

the seventh channel is a mounting hole formed in one side, close to the fishing joint (1), of the latch body (2);

and the one-way valve assembly (43) is arranged in the seventh channel and comprises two one-way valves which are sequentially connected in series, and the input end of each one-way valve is connected with the chemical agent output end of the peripheral equipment and used for injecting a chemical agent between the latch body (2) and the lifting valve cap (5).

10. The subsea test tree of claim 1, further comprising a second chemical injection comprising:

and one end of the eighth channel is connected with an external chemical agent output end, and the other end of the eighth channel is communicated with the lower joint (31) and the inner cavity of the lower joint (31) through the latch body (2), the upper outer cylinder (12) and the lower outer cylinder (27).