Underwater Christmas tree rock debris cap

Abstract

The utility model relates to an underwater Christmas tree rock debris cap, relates to the technical field of petrochemical engineering, and is used for solving the problem of low liquid injection efficiency of the underwater Christmas tree rock debris cap. The device comprises a rock debris cap cover assembly which is arranged and locked on a subsea Christmas tree; the rock debris cap lifting basket is arranged on the rock debris cap; the female joint is arranged on the rock debris cap lifting basket, and the female joint is communicated with the liquid beating hole; the plug is matched with the female connector in an inserted mode and used for plugging the female connector. Wherein the rock debris cap cover assembly is provided with a liquid hitting hole, the liquid hitting hole is communicated with an inner hole of the subsea Christmas tree and used for hitting preservative liquid into the inner hole, and the subsea Christmas tree rock debris cap is constructed in the mode that when the plug is matched with the female connector in an inserted mode, the female connector is plugged by the plug, and the liquid hitting hole is separated from the external atmosphere. According to the utility model, the female joint is matched with the plug in an inserted manner to plug and open the liquid injection hole, so that the opening and plugging efficiency of the liquid injection hole is improved, and the field liquid injection efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of petrochemical technology, and in particular to a cuttings cap for underwater oil production. Background Technology

[0002] In deep-water oil exploration and development, subsea production trees are one of the key pieces of equipment. After well completion, a cuttings cap needs to be installed. The cuttings cap, locked to the top of the production tree, effectively isolates seawater, provides secondary locking of the tubing hanger, and allows for the injection of chemical agents into the production tree. Current technology typically involves an injection port on the cuttings cap, through which anti-corrosion fluid is injected. However, the sealing structure of the injection port in existing technology is relatively complex, making opening and sealing the injection port cumbersome, resulting in low on-site injection efficiency.

[0003] In other words, the cuttings caps used in existing underwater oil production technologies suffer from low fluid injection efficiency. Utility Model Content

[0004] This invention provides a cuttings cap for underwater oil production trees, which addresses the problem of low injection efficiency in underwater oil production trees.

[0005] This utility model provides a cuttings cap for underwater oil production, which includes:

[0006] The cuttings cap assembly, which is mounted and locked onto the submersible production tree; and

[0007] A cuttings cap lifting basket, which is mounted on the cuttings cap; and

[0008] The female connector, which is installed on the cuttings cap lifting basket, is connected to the injection hole; and

[0009] The plug is inserted into the female connector and is used to seal the female connector.

[0010] The cuttings cap assembly has a liquid injection hole that is connected to the inner hole of the subsea tree. It is used to inject anti-corrosion fluid into the inner hole. The cuttings cap structure of the subsea tree is such that when the plug and the female connector are plugged in, the female connector is blocked by the plug, and the liquid injection hole is isolated from the outside atmosphere.

[0011] In one embodiment, the cuttings cap assembly includes:

[0012] A cuttings cap, which is placed and locked onto the submersible production tree, and the cuttings cap is equipped with a fluid injection port; and

[0013] Multiple spring plungers are arranged circumferentially on the outer circumferential surface of the rock cuttings cap.

[0014] Among them, one end of multiple spring plungers extends into the cuttings cap and is locked onto the locking surface of the underwater production tree.

[0015] In one embodiment, the outer periphery of the rock cuttings cap is provided with multiple threaded holes, and multiple spring plungers are threadedly engaged with the multiple threaded holes in a one-to-one correspondence. One end of the spring plunger is screwed into the corresponding threaded hole and extends into the rock cuttings cap to lock with the locking surface.

[0016] In one embodiment, the cuttings cap is provided with a vent that communicates with the inner bore of the subsea tree. The cuttings cap of the subsea tree also includes a one-way valve, which is disposed in the vent and is used to allow one-way communication between the inner bore and the outside air.

[0017] In one embodiment, the female connector includes:

[0018] The body has a central hole opening along the axial direction inside, and a first radial hole and a second radial hole are provided on the outer periphery of the body, both of which communicate with the central hole; and

[0019] A clamping ring, fitted around the outer periphery of the main body, is used to press the main body firmly against the rock cuttings cap lifting basket; and

[0020] Threaded fasteners are installed on the clamping ring and the rock cuttings cap lifting basket to fix the clamping ring to the rock cuttings cap lifting basket.

[0021] The first radial hole is used to connect with the drilling hole, and the second radial hole is used to discharge the gas in the central hole. The underwater oil production cuttings cap is constructed such that when the plug and the female connector are inserted and matched, the plug seals the first and second radial holes.

[0022] In one embodiment, there are multiple first radial holes, which are spaced apart along the axial direction of the body.

[0023] In one implementation, the plug includes:

[0024] The plug has multiple annular sealing grooves on its outer periphery; and

[0025] A sealing ring is disposed within an annular sealing groove;

[0026] Among them, the structure of the cuttings cap for underwater oil production is such that when the plug and the female connector are plugged together, the sealing ring seals the gap between the plug and the central hole, and the first radial hole and the second radial hole are separated from the central hole.

[0027] In one embodiment, the plug also includes a handle disposed on the end of the plug away from the female connector for gripping by a human hand or a robotic arm.

[0028] In one embodiment, the plug further includes:

[0029] The guide head is located on the end of the plug that is inserted into the female connector and is used to guide the plug into the female connector.

[0030] In one implementation, it further includes:

[0031] The hydraulic hose has one end sealed to the injection hole and the other end sealed to the female connector. The female connector is connected to the injection hole through the hydraulic hose.

[0032] A stainless steel wire rope, one end of which is connected to a plug, and the other end of which is connected to a rock cuttings cap lifting basket.

[0033] The anode block is mounted on the rock cuttings cap lifting basket.

[0034] Compared with existing technologies, the advantages of this invention lie in the inclusion of a female connector on the cuttings cap lifting basket, with a fluid injection hole on it. Anti-corrosion fluid is injected into the inner bore of the subsea production tree through this fluid injection hole, thus protecting the internal surface of the subsea production tree's inner bore. The female connector and plug are used to seal and open the fluid injection hole; inserting the plug seals the hole, and removing the plug opens it, allowing for the insertion of the injection head. This improves the efficiency of opening and sealing the injection hole, thereby increasing the on-site fluid injection efficiency. Attached Figure Description

[0035] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings.

[0036] Figure 1 This is a three-dimensional structural schematic diagram of the underwater oil production cuttings cap in an embodiment of this utility model;

[0037] Figure 2 yes Figure 1 Top view of the cuttings cap in subsea oil production;

[0038] Figure 3 yes Figure 2 Cross-sectional view of section AA of the cuttings cap in subsea oil production;

[0039] Figure 4 yes Figure 2 Cross-sectional view of the cuttings cap BB in the subsea oil production facility.

[0040] Figure label:

[0041] 1. Cuttings cap lifting basket; 2. Cuttings cap; 3. Sealing gasket; 5. Spring plunger; 6. Stainless steel wire rope; 7. Female connector; 71. Body; 72. Compression ring; 8. Plug; 81. Plug; 82. Sealing ring; 83. Handle; 84. Guide head; 9. Check valve; 11. Hydraulic hose; 12. Bolt; 13. Nut; 14. Anode block. Detailed Implementation

[0042] The present invention will be further described below with reference to the accompanying drawings.

[0043] like Figures 1 to 4 As shown, this utility model provides a cuttings cap for a subsea production tree. The cuttings cap includes a cuttings cap assembly, a cuttings cap lifting basket 1, a female connector 7, and a plug 8. The cuttings cap assembly is mounted and locked onto the subsea production tree; the cuttings cap lifting basket 1 is mounted on the cuttings cap; the female connector 7 is mounted on the cuttings cap lifting basket 1 and communicates with a fluid injection port; the plug 8 is inserted into the female connector 7 and is used to seal the female connector 7. The cuttings cap assembly has a fluid injection port that communicates with the inner bore of the subsea production tree for injecting anti-corrosion fluid into the inner bore. When the plug 8 and the female connector 7 are inserted into the cuttings cap, the female connector 7 is sealed by the plug 8, and the fluid injection port is isolated from the external atmosphere.

[0044] In the above setup, a female connector 7 is installed in the cuttings cap lifting basket 1, and a fluid injection hole is provided on it. Anti-corrosion fluid is injected into the inner bore of the subsea production tree through the fluid injection hole, thereby protecting the internal surface of the subsea production tree's inner bore. The female connector 7 and the plug 8 are used to plug and open the fluid injection hole; inserting the plug 8 seals the fluid injection hole, and removing the plug 8 opens it, allowing the injection head to be inserted. This improves the efficiency of opening and sealing the injection hole, thus increasing the on-site fluid injection efficiency.

[0045] It should be noted that the structure of the injection head and the plug 8 are basically the same. The only difference is that the plug 81 is provided with an injection channel for injecting the anti-corrosion liquid into the first radial hole.

[0046] It should be noted that the cuttings cap of the subsea production tree can seal the inner bore of the subsea production tree, thus preventing external cuttings from entering the inner bore. This protects the internal surface of the subsea production tree's inner bore. Furthermore, this application includes a plug 8, which is inserted into the female connector 7 after the anti-corrosion fluid is injected. This isolates the drilling hole from the external atmosphere, preventing external contaminants from sequentially entering the drilling hole and the subsea production tree's inner bore, thereby protecting the internal surface of the subsea production tree's inner bore.

[0047] Specifically, such as Figures 1 to 4 As shown, in one embodiment, the cuttings cap assembly includes a cuttings cap 2 and a plurality of spring plungers 5. The cuttings cap 2 is seated and locked onto the subsea production tree, and has injection holes. The plurality of spring plungers 5 are circumferentially arranged on the outer circumferential surface of the cuttings cap 2. One end of each spring plunger 5 extends into the cuttings cap 2 and is engaged with the locking surface of the subsea production tree.

[0048] Specifically, such as Figures 1 to 4 As shown, in one embodiment, a sealing gasket 3 is provided at the contact point between the cuttings cap 2 and the top of the subsea production tree.

[0049] Specifically, such as Figures 1 to 4 As shown, in one embodiment, the cuttings cap assembly includes a cuttings cap 2 and three spring plungers 5. The cuttings cap 2 is seated and locked onto the subsea production tree, and has injection holes. The three spring plungers 5 are circumferentially arranged on the outer surface of the cuttings cap 2; one end of each spring plunger 5 extends into the cuttings cap 2 and is engaged with the locking surface of the subsea production tree.

[0050] Specifically, such as Figures 1 to 4 As shown, in one embodiment, the outer periphery of the rock cuttings cap 2 is provided with multiple threaded holes, and multiple spring plungers 5 are threadedly engaged with the multiple threaded holes one by one. One end of the spring plunger 5 is screwed into the corresponding threaded hole and extends into the rock cuttings cap 2 to lock with the locking surface.

[0051] Specifically, such as Figures 1 to 4 As shown, in one embodiment, three threaded holes are provided on the outer periphery of the rock cuttings cap 2. Three spring plungers 5 are threadedly engaged with the three threaded holes one by one. One end of the spring plunger 5 is screwed into the corresponding threaded hole and extends into the rock cuttings cap 2 to lock with the locking surface.

[0052] Specifically, such as Figures 1 to 4 As shown, in one embodiment, three threaded holes are evenly spaced circumferentially.

[0053] Specifically, such as Figures 1 to 4 As shown, in one embodiment, the cuttings cap 2 is provided with an exhaust port that communicates with the inner hole of the subsea tree. The cuttings cap of the subsea tree also includes a one-way valve 9, which is disposed in the exhaust port and is used to allow one-way communication between the inner hole and the outside air.

[0054] Specifically, such as Figures 1 to 4 As shown, in one embodiment, the female connector 7 includes a body 71, a clamping ring 72, and threaded fasteners. The body 71 has a central hole extending axially, and a first radial hole and a second radial hole on its outer periphery, both communicating with the central hole. The clamping ring 72 is fitted onto the outer periphery of the body 71 to clamp the body 71 onto the rock cuttings cap lifting basket 1. The threaded fasteners pass through the clamping ring 72 and the rock cuttings cap lifting basket 1, and are used to fix the clamping ring 72 to the rock cuttings cap lifting basket 1.

[0055] Specifically, such as Figures 1 to 4As shown, in one embodiment, the threaded fastener includes a bolt 12 and a nut 13.

[0056] Specifically, such as Figures 1 to 4 As shown, in one embodiment, bolt 12 passes through clamping ring 72 and rock chip cap lifting basket 1, and nut 13 is tightened with bolt 12.

[0057] Specifically, such as Figures 1 to 4 As shown, in one embodiment, there are multiple first radial holes, which are spaced apart along the axial direction of the body 71.

[0058] Specifically, such as Figures 1 to 4 As shown, in one embodiment, there are two first radial holes, which are spaced apart along the axial direction of the body 71.

[0059] It should be noted that the two first radial holes can be injected with the anti-corrosion liquid simultaneously, thus improving the injection efficiency. Of course, depending on the actual situation, one, three, or more first radial holes can be set.

[0060] Specifically, such as Figures 1 to 4 As shown, in one embodiment, the plug 8 includes a plug 81 and a sealing ring 82. The plug 81 has multiple annular sealing grooves on its outer periphery; the sealing ring 82 is disposed within the annular sealing grooves; the underwater oil production cuttings cap is constructed such that when the plug 8 and the female connector 7 are inserted and mated, the sealing ring 82 seals the gap between the plug 81 and the central hole, and the first radial hole and the second radial hole are separated from the central hole.

[0061] Specifically, such as Figures 1 to 4 As shown, in one embodiment, the plug 8 includes a plug 81 and sealing rings 82. The plug 81 has four annular sealing grooves on its outer periphery; the four sealing rings 82 are respectively disposed within the four annular sealing grooves. In the underwater oil production cuttings cap structure, when the plug 8 and the female connector 7 are inserted and mated, the four sealing rings 82 seal the gap between the plug 81 and the central hole, while the two first radial holes and a single second radial hole are isolated from the central hole.

[0062] Specifically, such as Figures 1 to 4 As shown, in one embodiment, the plug 8 also includes a handle 83, which is disposed on the end of the plug 81 away from the female connector 7 for hand gripping.

[0063] Specifically, such as Figures 1 to 4 As shown, in one embodiment, the plug 8 further includes a guide head 84, which is disposed on one end of the plug 81 that is inserted into the female connector 7, for guiding the plug 8 into the female connector 7.

[0064] Specifically, in one embodiment, the guide head 84 is made of nylon material.

[0065] Specifically, such as Figures 1 to 4 As shown, in one embodiment, the underwater cuttings cap for oil production also includes a hydraulic hose 11 and a stainless steel wire rope 6. One end of the hydraulic hose 11 is sealed to a fluid injection hole, and the other end is sealed to a female connector 7, which communicates with the fluid injection hole via the hydraulic hose 11. One end of the stainless steel wire rope 6 is connected to a plug 8, and the other end is connected to the cuttings cap lifting basket 1. An anode block 14 is mounted on the cuttings cap lifting basket 1.

[0066] It should be noted that, in order to prove the effectiveness of the cuttings cap cathodic protection system, a continuous conductivity test should be conducted, with a focus on testing the conductivity between the cuttings cap and the cathodic protection system.

[0067] (1) Take 4 test points on the pins of the anode protection block and name them test points 1, 2, 3, and 4 respectively. Figures 1 to 4 As shown. If there is already a coating on the pin, a small portion can be removed using appropriate methods; in any case, the electrical continuity of the test point must be guaranteed.

[0068] (2) Remove the spring plunger and take three test points (without paint inside the threaded holes) in the rock chip cap where the spring plunger is installed. Name them test points A, B, and C. Note that the spring plunger should be reinstalled after the factory test.

[0069] (3) Use a multimeter to measure the resistance between test point A and test points 1, 2, 3, and 4, and record them as Ra1, Ra2, Ra3, and Ra4 respectively.

[0070] (4) According to API 17D, the resistance between test point A and the cathodic protection system should be less than 0.1Ω. If any of the resistances Ra1, Ra2, Ra3, and Ra4 is less than 0.1Ω, then test point A meets the requirements.

[0071] (5) Use the same method to verify whether test points B and C meet the requirements.

[0072] Although the present invention has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of the invention. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An underwater Christmas tree debris cap, characterized in that, It includes: The cuttings cap assembly is mounted and locked onto the submersible Christmas tree; as well as A rock cuttings cap lifting basket is mounted on the rock cuttings cap. as well as A female connector, which is mounted on the cuttings cap lifting basket, and the female connector communicates with the injection hole; and A plug that is inserted into the female connector and is used to seal the female connector; The cuttings cap assembly has a liquid injection hole that is connected to the inner hole of the subsea tree for injecting anti-corrosion liquid into the inner hole. The cuttings cap of the subsea tree is designed such that when the plug and the female connector are inserted and matched, the female connector is blocked by the plug, and the liquid injection hole is isolated from the external atmosphere.

2. The subsea Christmas tree debris cap of claim 1, wherein, The rock cuttings cap assembly includes: A cuttings cap, which is placed and locked onto the submersible wellhead, and the cuttings cap is provided with the fluid injection port; and Multiple spring plungers are disposed circumferentially on the outer peripheral surface of the rock cuttings cap. One end of each of the spring plungers extends into the cuttings cap and is locked onto the locking surface of the subsea tree.

3. The subsea Christmas tree debris cap of claim 2, wherein, The outer periphery of the rock cuttings cap is provided with multiple threaded holes, and multiple spring plungers are threadedly engaged with the multiple threaded holes one by one. One end of the spring plunger is screwed into the corresponding threaded hole and extends into the rock cuttings cap to lock with the locking surface.

4. The subsea Christmas tree debris cap of claim 2, wherein, The cuttings cap is provided with an exhaust port that communicates with the inner hole of the subsea production tree. The cuttings cap of the subsea production tree also includes a one-way valve, which is located in the exhaust port and is used to allow one-way communication between the inner hole and the outside air.

5. The subsea Christmas tree debris cap of claim 1, wherein, The female connector includes: The body has a central hole extending axially inside, and a first radial hole and a second radial hole are provided on the outer periphery of the body, both of which communicate with the central hole; and A clamping ring, fitted around the outer periphery of the body, is used to press the body firmly against the rock cuttings cap lifting basket; and Threaded fasteners are passed through the clamping ring and the rock cuttings cap lifting basket to fix the clamping ring to the rock cuttings cap lifting basket. The first radial hole is used to communicate with the injection hole, and the second radial hole is used to discharge the gas in the central hole. The underwater oil production tree cuttings cap is constructed such that when the plug is inserted into the female connector, the plug seals the first radial hole and the second radial hole.

6. The underwater oil production cuttings cap according to claim 5, characterized in that, The number of the first radial holes is multiple, and they are spaced apart along the axial direction of the body.

7. The subsea Christmas tree debris cap of claim 6, wherein, The plug includes: The plug has multiple annular sealing grooves on its outer periphery; and A sealing ring is disposed within the annular sealing groove; In the subsea oil production cuttings cap structure, when the plug and the female connector are inserted and matched, the sealing ring seals the gap between the plug and the central hole, and the first radial hole and the second radial hole are separated from the central hole.

8. The subsea Christmas tree debris cap of claim 7, wherein, The plug also includes a handle, which is located on the end of the plug away from the female connector, for gripping by a human hand or a robotic arm.

9. The subsea Christmas tree debris cap of claim 7, wherein, The plug also includes: A guide head is disposed on one end of the plug that is inserted into the female connector, for guiding the plug into the female connector.

10. The subsea Christmas tree debris cap of claim 1, wherein, Also includes: A hydraulic hose, one end of which is sealed to the injection hole, and the other end of which is sealed to the female connector, the female connector being connected to the injection hole through the hydraulic hose; A stainless steel wire rope, one end of which is connected to the plug, and the other end of which is connected to the rock chip cap lifting basket; An anode block is mounted on the rock debris cap lifting basket.

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