CN210068052U - Underwater wellhead anti-corrosion cap - Google Patents
Underwater wellhead anti-corrosion cap Download PDFInfo
- Publication number
- CN210068052U CN210068052U CN201920415696.2U CN201920415696U CN210068052U CN 210068052 U CN210068052 U CN 210068052U CN 201920415696 U CN201920415696 U CN 201920415696U CN 210068052 U CN210068052 U CN 210068052U
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- casing
- protective
- underwater wellhead
- locking
- underwater
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Abstract
The utility model discloses an underwater wellhead anticorrosion cap, which comprises a protective cylinder, a filling component arranged on the protective cylinder and used for filling anticorrosion liquid, at least one group of locking components arranged on the protective cylinder and matched with the side surface of an underwater wellhead head, and a lifting mechanism arranged on the protective cylinder and capable of moving back and forth in the axial direction of the protective cylinder; the locking assembly comprises a protective shell fixed on the outer side surface of the protective barrel and a locking piece arranged between the protective shell and the protective barrel; the protective cylinder is provided with a window penetrating through the inner side and the outer side of the protective cylinder corresponding to the locking piece, and the upper part of the window is provided with an elastic piece; the internal face of protective housing is equipped with the spout, and the cooperation of spout round trip movement can be followed to retaining member second end in the spout, drives the first end business turn over window of retaining member. The utility model discloses an anticorrosive cap of underwater well head, simple structure, overhead easy installation locking and unblock of underwater well head can use wire rope to go into the installation down, and the unblock process need not underwater robot and carries out the auxiliary operation, effectively solves the anticorrosive cap of underwater well head with high costs, volatile problem of effect.
Description
Technical Field
The utility model relates to a drilling engineering technical field especially relates to an anticorrosive cap of underwater wellhead.
Background
In the process of developing deepwater and sub-deepwater petroleum and natural gas resources by adopting an underwater production system, because temporary well abandonment needs to carry out anticorrosion protection on an underwater wellhead, a commonly used anticorrosion protection device for the underwater wellhead is an underwater wellhead anticorrosion cap, and the main functions of the anticorrosion protection device are as follows: the underwater wellhead is prevented from being polluted by rock debris and marine organisms, meanwhile, corrosion prevention is provided for the underwater wellhead by injecting the corrosion prevention liquid, and foreign objects can be prevented from being dragged to the underwater wellhead.
The underwater wellhead anti-corrosion cap is used as a matched device, generally sold with an underwater production system in a set, and is expensive. Meanwhile, the existing anticorrosion caps for underwater wellhead heads are usually arranged in a locking mode through pull rods, and in the installation and unlocking processes, an underwater robot needs to be used for auxiliary operation, so that the operation is troublesome. The existing simple underwater wellhead head anti-corrosion caps are usually locked by spring pieces or do not use locking mechanisms, and once the anti-corrosion caps are dragged by a fishing net, the anti-corrosion caps are easy to deflect and even are taken away from the wellhead head to lose the protection effect.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in providing a simple structure, the anticorrosive cap of underwater wellhead of easy installation and unblock.
The utility model provides a technical scheme that its technical problem adopted is: the underwater wellhead anticorrosion cap comprises a protective cylinder, a filling assembly, at least one group of locking assemblies and a lifting mechanism, wherein the protective cylinder is sleeved on an underwater wellhead, the filling assembly is arranged on the protective cylinder and used for filling anticorrosion liquid, the locking assemblies are arranged on the protective cylinder and matched with the side surface of the underwater wellhead, and the lifting mechanism is arranged on the protective cylinder and can move back and forth in the axial direction of the protective cylinder;
the locking assembly comprises a protective shell fixed on the outer side face of the protective barrel and a locking piece arranged between the protective shell and the protective barrel; the protective barrel is provided with a window penetrating through the inner side and the outer side of the protective barrel corresponding to the locking piece, and the upper part of the window is provided with an elastic piece; a sliding groove is formed in the inner wall surface of the protective shell, and the second end of the locking piece can move back and forth along the sliding groove to be matched in the sliding groove so as to drive the first end of the locking piece to enter and exit the window;
when the underwater wellhead anticorrosion cap is in a locking state on an underwater wellhead, the first end of the locking member penetrates into the window to abut against the side face of the underwater wellhead, the elastic member abuts against one side of the first end of the locking member, and the lifting mechanism is interfered with the second end of the locking member to limit the locking member to move in a direction away from the window;
when the underwater wellhead anticorrosion cap is in an unlocking state on the underwater wellhead, the lifting mechanism leaves the second end of the locking member, and the first end of the locking member exits from the window.
Preferably, the lifting mechanism comprises a lifting frame which can move up and down and is arranged on an end cover of the protective sleeve, a positioning fork which is arranged between the protective shell and the protective sleeve, and a pull rod which is arranged between the protective shell and the protective sleeve and is connected with the lifting frame and the positioning fork;
in the locking state, the positioning fork abuts against the second end of the locking piece;
in the unlocked state, the positioning fork is clear of the second end of the retaining member.
Preferably, the hoisting frame comprises a mandrel located at the center of the casing end cover, at least one rib plate connected with the mandrel and extending in the radial direction of the casing end cover, and the pull rod is connected with the rib plate.
Preferably, the pull rod is in threaded connection with the positioning fork; and/or the pull rod is in threaded connection with the rib plate.
Preferably, a protective tube is arranged at the center of an end cover of the protective tube, and the mandrel is accommodated in the protective tube;
a through groove for the rib plate to pass through is formed in the side surface of the protective pipe; the height of the through groove on the pile casing end cover is larger than that of the rib plate.
Preferably, the underwater wellhead anticorrosion cap comprises four groups of locking assemblies which are uniformly distributed at intervals along the circumferential direction of the casing;
the lifting mechanism correspondingly comprises four positioning forks and four pull rods;
the lifting frame comprises four rib plates; the four rib plates are connected with the mandrel in a cross manner.
Preferably, the mandrel and the protective tube are connected through at least one shear pin.
Preferably, the top of the mandrel is also provided with a lifting lug.
Preferably, one end of the elastic member is located above the window and fixed on the inner side surface of the casing, and the other end of the elastic member extends to the upper part of the window and inclines towards the central axis direction of the casing.
Preferably, the filling assembly comprises at least one filling opening arranged on an end cover of the casing, a filling pipeline arranged in the casing and connected with the filling opening, and a first check valve arranged on the filling pipeline.
Preferably, the filling assembly further comprises a guide bell mouth arranged on the end cover of the casing and connected to the filling port.
Preferably, the end cover of the casing is further provided with a liquid discharge port for discharging liquid in the casing; and a second check valve is arranged at the liquid discharge port.
Preferably, the inner surface of the end cover of the casing is provided with a sealing rubber gasket which is sealed between the end cover and the end face of the underwater wellhead.
The utility model has the advantages that: simple structure easily installs locking and unblock on the underwater wellhead head, can use wire rope to go into the installation under, and the unblock process need not underwater robot and carries out the auxiliary operation, effectively solves the anticorrosive cap of underwater wellhead problem with high costs, volatile.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic longitudinal sectional structure view of an underwater wellhead anticorrosion cap according to an embodiment of the present invention;
fig. 2 is a top view of an underwater wellhead corrosion protection cap according to an embodiment of the present invention;
fig. 3 is a bottom view of the underwater wellhead corrosion prevention cap according to an embodiment of the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1-3, an underwater wellhead anticorrosion cap according to an embodiment of the present invention may include a casing 10, a filling assembly 20 installed on the casing, at least one set of locking assemblies 30, and a lifting mechanism 40.
Wherein, the casing 10 is used for being sleeved on an underwater wellhead; the filling assembly 20 is used for filling the preservative solution. The locking assembly 30 is adapted to engage the side of the underwater wellhead head to lock the casing 10 to the underwater wellhead head. The lifting mechanism 40 is movable back and forth on the casing 10 in the axial direction of the casing 10, and interferes with the lock assembly 30 to lock the locked state.
Specifically, the casing 10 is open at one end and closed at the other end by an end cap 11. The casing 10 is fitted with its open end to the underwater wellhead head, and the end cap 11 is fitted over the end face of the underwater wellhead head. As shown in fig. 3, in order to prevent the corrosion protection liquid inside the corrosion protection cap from mutually permeating with seawater, a sealing rubber gasket 12 is arranged on the inner surface of an end cover 11 of the casing 10 and is sealed between the end cover 11 and the end face of the underwater wellhead.
The filling assembly 20 comprises at least one filling port 21 provided in the end cap 11 of the casing 10, a filling line 22 provided in the casing 10 and connected to the filling port 21, and a first check valve 23 provided on the filling line 22. The provision of the first check valve 23 on the filling line 22 allows the anticorrosive liquid to enter the filling line 22 from the filling port 21 and flow toward the inside of the casing 10, restricting the anticorrosive liquid from reversely flowing out of the casing 10.
The filling assembly 20 further comprises a guide bell mouth 24 which is arranged on the end cover 11 of the pile casing 10 and connected to the filling port 21, and is convenient for filling the preservative solution, in particular for a preservative solution filling of an underwater robot.
Preferably, the filling assembly 20 comprises two filling ports 21 symmetrically arranged on the end cover 11 of the casing 10 to ensure that the underwater robot operates in any direction, and the filling ports 21 are arranged on one side of the underwater robot within 180 degrees to facilitate filling of the preservative solution. The filling pipeline 22 in the casing 10 can be connected with the two filling ports 21 through a three-way valve, and a first check valve 23 is arranged at each filling port 21 in the casing 10, so that the filling processes of the two filling ports 21 are not influenced by each other.
Besides filling, the end cap 11 of the cartridge 10 is further provided with a liquid discharge port 13 for discharging liquid in the cartridge 10, so that the liquid in the cartridge 10 can be conveniently discharged. A second check valve 14 is arranged at the liquid outlet 13 to prevent the discharged liquid from reversely flowing back into the casing 10.
The locking assembly 30 includes a protective case 31 fixed on the outer side of the casing 10, and a locking member 32 disposed between the protective case 31 and the casing 10. The protective cylinder 10 is provided with windows 15 penetrating through the inner side and the outer side of the protective cylinder 10 corresponding to the locking pieces 32, and the number and the positions of the windows 15 are arranged corresponding to the locking assemblies 30. The upper part of the window 15 is provided with an elastic member 16. The inner wall surface of the protective shell 31 is provided with a sliding groove 310, and the second end of the locking member 32 can move back and forth along the sliding groove 310 and be matched in the sliding groove 310, so as to drive the first end of the locking member 32 to enter and exit the window 15.
When the underwater wellhead anticorrosion cap is in a locking state on the underwater wellhead, the first end of the locking member 32 penetrates into the window 15 to abut against the side surface of the underwater wellhead, the elastic member 16 abuts against one side of the first end of the locking member 32, the lifting mechanism 40 interferes with the second end of the locking member 32, and the locking member 32 is limited to move in the direction away from the window 15. When the subsea wellhead corrosion protection cap is in an unlocked state on the subsea wellhead, the lifting mechanism 40 is clear of the second end of the retaining member 32 and the first end of the retaining member 32 exits the window.
The elastic member 16 is located in the casing 10, has one end located above the window 15 and fixed to the inner side surface of the casing 10, and has the other end extending to the upper portion of the window 15 and inclined toward the central axis of the casing 10. Alternatively, the elastic member 16 may be a leaf spring.
In this embodiment, retaining member 32 is disposed obliquely with respect to the central axis of casing 10. The locking member 32 has a first end facing the accessible window 15 and a second end inclined downwardly and facing the protective casing 31, so that the locking member 32 moves back and forth in a direction inclined with respect to the central axis of the casing 10, bringing its first end into the accessible window 15 against the elastic member 16, or exiting the accessible window 15 and away from the elastic member 16. The sliding slot 310 on the protection shell 31 extends obliquely corresponding to the locking member 32, and the length direction is consistent with the moving direction of the locking member 32.
The slide groove 310 may be provided in two, and opened on the inner wall surface of the protective case 31 corresponding to the opposite sides of the locker 32. The second end of the locking member 32 may be provided with a post that fits within the sliding slot 310.
The lifting mechanism 40 may include a lifting frame 41 provided on the end cap 11 of the casing 10 to be movable up and down, a positioning fork 42 provided between the protective case 31 and the casing 10, and a pull rod 43 provided between the protective case 31 and the casing 10 and connecting the lifting frame 41 and the positioning fork 42. Wherein, the pull rod 43 is parallel to the central axis of the pile casing 10; the positioning fork 42 is adapted to cooperate with the retaining member 32 and to abut against the retaining member 32. The positioning fork 42 is connected to the lifting frame 41 through a pull rod 43, so that the lifting frame 41 drives the positioning fork 42 to move up and down to abut against or separate from the locking piece 32 when moving up and down relative to the casing 10.
When the underwater wellhead corrosion prevention cap is in a locking state on the underwater wellhead, the positioning fork 42 abuts against the second end of the locking member 42, so that the locking member 32 is limited in a state that the locking member is tightly pressed by the elastic member 16. When the subsea wellhead corrosion protection cap is in an unlocked state on the subsea wellhead, the positioning fork 42 is clear of the second end of the retaining member 32, at which point the retaining member 32 moves along the chute 310 driving its first end out of the window 15.
The positioning fork 42 may be generally cylindrical and may have a forked end adjacent to the locking member 32, such that it abuts against the post at the second end of the locking member 32. The end of the positioning fork 42 remote from the locking member 32 is connected to a pull rod 43, which may be fixed or adjustable. For example, the positioning fork 42 is connected with the pull rod 43 through threads, so that the length of the pull rod 43 locked into the positioning fork 42 can be adjusted according to the position of the locking piece 32 on the outer side of the casing 10, and the height of the positioning fork 42 on the outer side of the casing 10 can be adjusted.
Further, the lifting frame 41 may include a mandrel 411 located at the center of the end cover 11 of the casing 10, at least one rib 412 connected to the mandrel 411 and extending in the radial direction of the end cover 11 of the casing 10, and the pull rod 43 is connected to the rib 412. The pull rod 43 and the rib plate 412 can also be connected by screw threads, so that the pull rod 43 can be detached and adjusted in length. The top of the mandrel 411 is also provided with a lifting lug 44 to facilitate lifting the whole lifting mechanism 40.
The number and the positions of the pull rod 43, the positioning fork 42 and the rib plate 412 on the end cover 11 correspond to the number and the positions of the locking assemblies 30. When there are multiple sets of locking assemblies 30, the lifting mechanism 40 includes multiple tie rods 43 and multiple positioning forks 42, and the lifting frame 41 includes multiple rib plates 412. Each rib plate 412 is connected with a pull rod 43, the pull rod 43 is connected with a positioning fork 42, and the positioning forks 42 are arranged in the protective shell 31 of the locking assembly 30 one by one.
The protective tube 17 is provided at the center of the end cap 11 of the casing 10 (on the central axis of the casing 10) corresponding to the lifting frame 41 of the lifting mechanism 40. The inner diameter of the protective pipe 17 is larger than the outer diameter of the mandrel 411, the mandrel 411 is accommodated in the protective pipe 17 and can move back and forth along the axial direction of the protective pipe 17, and the rib plate 412 moves along with the mandrel 411.
A through-groove (not shown) through which the rib plate 412 passes is provided on the side surface of the protection pipe 17. The height of the through groove on the end cover 11 of the pile casing 10 is larger than that of the rib plate 412, so that a space is reserved for the rib plate 412 to move upwards relative to the pile casing 17. The arrangement of the through grooves has an axial guiding effect on the rib plates 412 and a circumferential limiting effect, and the rib plates 412 are prevented from moving in the circumferential direction to drive the positioning forks 42 to deviate.
The mandrel 411 and the protective tube 17 are also connected by at least one shear pin 18. In the locked state, the shear pin 18 connects the stem 411 and the protective tube 17 together, and plays a role in limiting the up-and-down movement of the stem 411 in the protective tube 17. The shear pin 18 is a connecting member that can be sheared as needed, and a shear pin having a corresponding shearing force can be selected as needed. When it is desired to unlock, the lifting mechanism 40 can be moved to release the interference with the lock 32 after the shear force is applied to shear the shear pin 18.
In this embodiment, as shown in fig. 1 and 2, the underwater wellhead corrosion prevention cap includes four sets of locking assemblies 30 uniformly spaced along the circumference of the casing 10. The side of the casing 10 is provided with four windows 15 corresponding to the locking assemblies 30 one by one, and an elastic member 16 is provided at the upper portion of each window 15. The four sets of locking assemblies 30 corresponding to the lifting mechanism 40 comprise four positioning forks 42 and four pull rods 43; the lifting frame 41 comprises four rib plates 412, and the four rib plates 412 are connected with the mandrel 411 in a crisscross manner. Four positioning forks 42 are respectively arranged in the protective shell 31 of the four groups of locking assemblies 30, and four pull rods 43 are respectively connected between the four positioning forks 42 and four rib plates 412.
The utility model discloses an among the anticorrosive cap of underwater wellhead, the first end of retaining member 32 is supported tightly by elastic component 16 in window 15, is in the normal locking state. When the integral anti-corrosion cap is installed and used, the integral anti-corrosion cap is put on the underwater wellhead. When unlocking is required, the lifting mechanism 40 is lifted up by the lifting lug 44, the positioning fork 42 is separated from the locking member 32, and the locking member 32 moves along the sliding groove 310 to drive the first end of the locking member to exit the window 15, so that unlocking is completed.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.
Claims (13)
1. An underwater wellhead anticorrosion cap is characterized by comprising a protective cylinder (10) sleeved on an underwater wellhead head, a filling assembly (20) arranged on the protective cylinder (10) and used for filling anticorrosion liquid, at least one group of locking assemblies (30) arranged on the protective cylinder (10) and matched with the side surface of the underwater wellhead head, and a lifting mechanism (40) arranged on the protective cylinder (10) and capable of moving back and forth in the axial direction of the protective cylinder (10);
the locking assembly (30) comprises a protective shell (31) fixed on the outer side face of the protective sleeve (10) and a locking piece (32) arranged between the protective shell (31) and the protective sleeve (10); a window (15) penetrating through the inner side surface and the outer side surface of the protective cylinder (10) is arranged on the protective cylinder (10) corresponding to the locking piece (32), and an elastic piece (16) is arranged at the upper part of the window (15); a sliding groove (310) is formed in the inner wall surface of the protective shell (31), the second end of the locking member (32) can move back and forth along the sliding groove (310) to be matched in the sliding groove (310), and the first end of the locking member (32) is driven to enter and exit the window (15);
when the underwater wellhead anticorrosion cap is in a locking state on an underwater wellhead, the first end of the locking member (32) penetrates into the window (15) to abut against the side surface of the underwater wellhead head, the elastic member (16) abuts against one side of the first end of the locking member (32), the lifting mechanism (40) interferes with the second end of the locking member (32), and the locking member (32) is limited to move towards the direction away from the window (15);
when the underwater wellhead anticorrosion cap is in an unlocking state on the underwater wellhead, the lifting mechanism (40) leaves the second end of the locking member (32), and the first end of the locking member (32) exits from the window (15).
2. The underwater wellhead corrosion prevention cap according to claim 1, wherein the lifting mechanism (40) comprises a lifting frame (41) which can move up and down and is arranged on an end cover (11) of the casing (10), a positioning fork (42) which is arranged between the protective shell (31) and the casing (10), and a pull rod (43) which is arranged between the protective shell (31) and the casing (10) and is connected with the lifting frame (41) and the positioning fork (42);
in the locked state, the positioning fork (42) abuts on the second end of the locking piece (32);
in the unlocked state, the positioning fork (42) is clear of the second end of the retaining member (32).
3. The underwater wellhead corrosion prevention cap according to claim 2, characterized in that the lifting frame (41) comprises a mandrel (411) located at the center of the casing (10) end cover (11), at least one rib plate (412) connected with the mandrel (411) and extending in the radial direction of the casing (10) end cover (11), and the pull rod (43) is connected with the rib plate (412).
4. A subsea wellhead corrosion protection cap according to claim 3, characterized in that the tie rod (43) is threaded with the positioning forks (42); and/or the pull rod (43) is in threaded connection with the rib plate (412).
5. An underwater wellhead anticorrosion cap according to claim 3, characterized in that a protective pipe (17) is arranged at the center of the end cover (11) of the protective cylinder (10), and the mandrel (411) is accommodated in the protective pipe (17);
a through groove for the rib plate (412) to pass through is formed in the side surface of the protective pipe (17); the height of the through groove on the end cover (11) of the pile casing (10) is greater than that of the rib plate (412).
6. The subsea wellhead corrosion protection cap according to claim 5, characterized by comprising four sets of said locking assemblies (30) evenly spaced circumferentially of said casing (10);
the lifting mechanism (40) correspondingly comprises four positioning forks (42) and four pull rods (43);
the lifting frame (41) comprises four rib plates (412); the four rib plates (412) are connected with the mandrel (411) in a cross mode.
7. An underwater wellhead corrosion prevention cap according to claim 5, characterized in that the connection between the mandrel (411) and the protection pipe (17) is further through at least one shear pin (18).
8. An underwater wellhead corrosion prevention cap according to claim 4, characterized in that the top of the mandrel (411) is also provided with a lifting lug (44).
9. An underwater wellhead corrosion prevention cap according to claim 1, characterized in that one end of the elastic member (16) is positioned above the window (15) and fixed on the inner side surface of the casing (10), and the other end extends to the upper part of the window (15) and inclines towards the central axis direction of the casing (10).
10. An underwater wellhead corrosion prevention cap according to any of claims 1 to 9, characterized in that the filling assembly (20) comprises at least one filling port (21) arranged on an end cover of the casing (10), a filling line (22) arranged in the casing (10) and connected to the filling port (21), a first check valve (23) arranged on the filling line (22).
11. The subsea wellhead corrosion protection cap according to claim 10, characterized in that the filling assembly (20) further comprises a guide bell (24) disposed on the end cap (11) of the casing (10) and connected to the filling port (21).
12. An underwater wellhead corrosion prevention cap according to any one of claims 1 to 9, characterized in that a liquid discharge port (13) for discharging liquid in the casing (10) is further provided on the end cover (11) of the casing (10); and a second check valve (14) is arranged at the liquid outlet (13).
13. An underwater wellhead corrosion prevention cap according to any of claims 1 to 9, characterized in that the inner surface of the end cover (11) of the casing (10) is provided with a sealing rubber gasket (12) which is sealed between the end cover (11) and the end face of the underwater wellhead.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920415696.2U CN210068052U (en) | 2019-03-28 | 2019-03-28 | Underwater wellhead anti-corrosion cap |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920415696.2U CN210068052U (en) | 2019-03-28 | 2019-03-28 | Underwater wellhead anti-corrosion cap |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210068052U true CN210068052U (en) | 2020-02-14 |
Family
ID=69434933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920415696.2U Withdrawn - After Issue CN210068052U (en) | 2019-03-28 | 2019-03-28 | Underwater wellhead anti-corrosion cap |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210068052U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109899020A (en) * | 2019-03-28 | 2019-06-18 | 中国海洋石油集团有限公司 | Underwater well head anti-corrosion cap |
| CN115788347A (en) * | 2023-01-29 | 2023-03-14 | 江苏雄越石油机械设备制造有限公司 | Gas production wellhead capable of preventing gas impurity corrosion |
-
2019
- 2019-03-28 CN CN201920415696.2U patent/CN210068052U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109899020A (en) * | 2019-03-28 | 2019-06-18 | 中国海洋石油集团有限公司 | Underwater well head anti-corrosion cap |
| CN109899020B (en) * | 2019-03-28 | 2023-09-19 | 中国海洋石油集团有限公司 | Corrosion-proof cap for underwater wellhead |
| CN115788347A (en) * | 2023-01-29 | 2023-03-14 | 江苏雄越石油机械设备制造有限公司 | Gas production wellhead capable of preventing gas impurity corrosion |
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Granted publication date: 20200214 Effective date of abandoning: 20230919 |
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