A shallow water Christmas tree cap

Abstract

The application discloses a shallow water Christmas tree cap. The cap comprises a plug, a cap seat, a locking ring groove, an expansion assembly, an annular component and a screwing assembly. The outer diameter of the plug is matched with the connecting cylinder of the upper part of the Christmas tree body. The center matching hole is arranged on the center of the upper end surface of the plug. The annular support platform is arranged on the middle upper part of the outer periphery of the plug. The cap seat is arranged above the plug and has a spacing with the upper end surface of the plug. The locking ring groove is arranged on the inner wall of the connecting cylinder. The expansion assembly is arranged on the annular support platform. The annular component is sleeved on the upper end of the plug. The lower end of the screwing assembly is inserted into the center matching hole and is located above the annular component. The screwing assembly is used for pressing the annular component downward, so that the annular component is inserted between the expansion assembly and the plug, and the annular component is radially expanded. The cap has the beneficial effects that the plug is set and sealed by the screwing assembly driving the expansion assembly to be radially expanded, and the locking operation between the tree cap and the Christmas tree body is simplified.

Description

Technical Field

[0001] This invention relates to the field of petrochemical technology, and in particular to a shallow-water oil production tree cap. Background Technology

[0002] Subsea wellheads are widely used in the development of subsea oil and gas fields and are extremely important pieces of equipment during drilling, completion, and oil production. The wellhead cap is one of the key components of the wellhead. It is installed at the upper end of the wellhead, above the tubing hanger assembly, and is used to prevent rock cuttings and impurities from falling into the gap between the tubing hanger and the wellhead. It can also withstand pressure from above and below.

[0003] The installation and retrieval of tree caps are typically carried out underwater by ROV robots. In existing technologies, tree caps are mainly secured to the upper end of the production tree using threaded connections and hydraulic locking. However, in offshore oil extraction, due to the complex and variable underwater environment and operating conditions, securing tree caps to the production tree using traditional methods is complex and difficult, often requiring the use of multiple tools in conjunction with the ROV robot to complete the installation and removal. Tree cap installation and retrieval are characterized by significant difficulty, long processing time, high cost, and numerous uncontrollable factors. Summary of the Invention

[0004] The purpose of this invention is to provide a shallow-water oil production tree cap, which includes a plug, a cap seat, an expansion assembly, an annular component, and a screwing assembly. The screwing assembly drives the expansion assembly to expand radially, thereby achieving plug sealing, simplifying the locking operation between the tree cap and the oil production tree body, and facilitating disassembly and assembly by an ROV robot.

[0005] To achieve the above objectives, the present invention adopts the following technical solution, including:

[0006] The plug has an outer diameter that is compatible with the connecting cylinder at the top of the tree body. A center fitting hole is provided at the center of the upper end face of the plug, and an annular support platform is provided at the upper middle part of the outer periphery of the plug. The plug is used to be inserted into the connecting cylinder.

[0007] A cap holder, which covers the plug and has a gap between itself and the upper end face of the plug; an opening in the center of the cap holder corresponding to the central mating hole; and

[0008] A locking ring groove is provided on the inner wall of the connecting cylinder;

[0009] An expansion assembly, disposed on the annular support platform, is used to embed into the locking ring groove when radial expansion occurs, thereby setting the plug.

[0010] An annular component, which is fitted onto the upper end of the plug, is used to insert between the expansion assembly and the plug, causing the annular component to expand radially.

[0011] Tighten the assembly so that its lower end extends into the central mating hole and is positioned above the annular component, for pressing down on the annular component, so that the annular component is inserted between the expansion assembly and the plug, causing the annular component to expand radially.

[0012] Preferably, it also includes:

[0013] A collar is disposed on the outer edge of the cap seat and extends downward, the inner circumference of the collar being adapted to the outer circumference of the connecting cylinder;

[0014] A sealing ring is provided between the inner circumference of the collar and the outer circumference of the connecting cylinder.

[0015] Preferably, it also includes:

[0016] The guide post is radially disposed within the central mating hole;

[0017] A guide tube is disposed at the lower end of the screwing assembly and extends into the central mating hole;

[0018] A spiral groove is provided on the outer periphery of the guide cylinder and is adapted to the guide post;

[0019] There are two sets of guide posts and spiral grooves, and the guide posts and spiral grooves correspond one-to-one.

[0020] Preferably, horizontal extension sections are provided at both ends of the spiral groove.

[0021] Preferably, a T-shaped operating block is provided at the upper end of the twisting component.

[0022] Preferably, the expansion component is formed by multiple arc-shaped blocks; a positioning ring is provided at the lower end of the cap base, which is directly opposite the annular support platform; the annular support platform cooperates with the positioning ring to limit the position of the expansion component.

[0023] Preferably, the upper end of the arc-shaped block is provided with a protrusion, and the lower end of the positioning ring is provided with a limiting part that cooperates with the protrusion.

[0024] Preferably, a plurality of support columns are provided within the spacing, the support columns being fixedly supported between the cap and the plug; a connecting piece located within the spacing is provided at the upper end of the annular component, the connecting piece being slidably fitted onto the support column; a central circular hole is provided on the connecting piece, and an annular groove is provided on the outer wall of the guide tube for rotatably engaging with the central circular hole.

[0025] Preferably, the cap and plug are provided with six sets of wire channels running through the height direction, each wire channel is provided with a cable, and the lower end of each cable is provided with a plug terminal. Among the six cables, three cables are grouped together, and the upper end of each group is connected to a three-phase connector.

[0026] Preferably, a lifting component is rotatably mounted on the top of the cap holder.

[0027] The beneficial effects of the present invention are: the twisting component drives the expansion component to expand radially, thereby achieving the sealing of the plug, simplifying the locking operation between the tree cap and the oil well body, and facilitating the disassembly and assembly by the ROV robot. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a shallow-water oil extraction tree cap according to the present invention;

[0029] Figure 2 This is a schematic diagram of the tree cap structure in this invention (the expansion component is in a radial expansion state);

[0030] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle;

[0031] Figure 4 This is a perspective view of the plug in this invention;

[0032] Figure 5 This is a perspective view of the twisting component in this invention;

[0033] Figure 6 This is a perspective view of the expansion component in this invention;

[0034] Figure 7 This is a schematic diagram of the assembly of a shallow water oil extraction tree cap according to the present invention. Detailed Implementation

[0035] The invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0036] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0037] like Figure 1-7 As shown, in one implementation of the present invention, to achieve the above objectives, the present invention adopts the following technical solution, including:

[0038] The outer diameter of the plug 100 is adapted to the connecting cylinder 21 on the upper part of the tree body 2. A center mating hole 110 is provided at the center of the upper end face of the plug 100, and an annular support platform 120 is provided in the upper middle part of the outer periphery of the plug 100. The plug 100 is used to insert into the connecting cylinder 21. As a preferred embodiment, the guide post 130 is radially disposed within the center mating hole 110. As a further preferred embodiment, the guide post 130 has a weakened design.

[0039] A cap seat 200 covers the plug 100 and has a gap 210 between it and the upper surface of the plug 100; an opening corresponding to the center mating hole 110 is located at the center of the cap seat 200. Preferably, it further includes: a collar 220, which is disposed on the outer edge of the cap seat 200 and extends downward, the inner circumference of the collar 220 being adapted to the outer circumference of the connecting cylinder 21; wherein a sealing ring 230 is provided between the inner circumference of the collar and the outer circumference of the connecting cylinder. More preferably, it further includes: a guide cylinder 610 disposed at the lower end of the turning assembly 600 and extending into the center mating hole 110; a spiral groove 630, which is disposed on the outer circumference of the guide cylinder 610 and adapted to the guide post 130; wherein the number of guide posts 130 and spiral grooves 630 are two sets each, and the guide posts 130 and spiral grooves 630 correspond one-to-one. As a further preferred embodiment, a plurality of support columns 240 are provided within the spacing 210, and the support columns 240 are fixedly supported between the cap seat 200 and the plug 100.

[0040] The locking ring groove 310 is provided on the inner wall of the connecting cylinder 21.

[0041] An expansion assembly 400 is disposed on the annular support platform 120 and is used to embed into the locking ring groove 310 during radial expansion, thereby setting the plug 100. Preferably, the expansion assembly 400 is formed by multiple arc-shaped blocks 410; a positioning ring 230 is provided at the lower end of the cap seat 200, directly opposite the annular support platform 120; the annular support platform 120 cooperates with the positioning ring 230 to limit the expansion assembly 400. Further preferably, the upper end of each arc-shaped block 410 has a protrusion 411, and the lower end of the positioning ring 230 has a limiting portion 231 that cooperates with the protrusion. Further preferably, the upper outer end of each arc-shaped block 410 has a guide slope 412; when the retrieval tool lifts the tree cap upwards, the guide slope 412 can return each arc-shaped block 410 to the retracted position.

[0042] An annular component 500 is fitted onto the upper end of the plug 100 and is inserted between the expansion assembly 400 and the plug 100, causing the annular component 500 to expand radially. Preferably, a plurality of support columns 240 are provided within the spacing 210, the support columns 240 being fixedly supported between the cap 200 and the plug 100; a connecting piece 510 located within the spacing 210 is provided at the upper end of the annular component 500, the connecting piece being slidably fitted onto the support column 240; a central circular hole 520 is provided on the connecting piece 510, and an annular groove 640 is provided on the outer wall of the guide cylinder 610, which rotatably engages with the central circular hole 520.

[0043] The lower end of the tightening assembly 600 extends into the central mating hole 110 and is located above the annular component 500. It is used to press down on the annular component 500, causing it to insert between the expansion assembly 400 and the plug 100, thus causing the annular component 500 to expand radially. Preferably, a T-shaped operating block 620 is provided at the upper end of the tightening assembly 600.

[0044] During installation, rotating the T-shaped operating block 620 drives the tightening assembly 600 to rotate. During rotation, the guide post 130 and the spiral groove 630 engage, and the tightening assembly 600 presses down on the annular component 500, causing the annular component 500 to insert between the expansion assembly 400 and the plug 100. This causes the expansion assembly 400 to radially expand and embed itself into the locking ring groove 310, thus setting the plug 100. During removal, rotating the T-shaped operating block 620 in the opposite direction drives the tightening assembly 600 to rotate. During rotation, the guide post 130 and the spiral groove 630 engage, and the tightening assembly 600 moves upward. The annular component 500 moves upward accordingly, and the expansion assembly 400 radially contracts under the action of restoring force, pushing out of the locking ring groove 310, thus removing the plug 100 from the connecting cylinder 21. When the rotating component 600 becomes stuck by sea sand or shellfish, it becomes difficult to rotate and unlock. In this case, a mechanical pulling method can be used to break the guide post 130, thereby unlocking it. During the pulling unlocking process, the guide post 130 is located within the horizontal extension section 631, which significantly increases the probability of the guide post 130 breaking.

[0045] In another embodiment, it further includes: a collar 220 disposed on the outer edge of the cap seat 200 and extending downward, the inner circumference of the collar 220 being adapted to the outer circumference of the connecting cylinder 21; wherein a sealing ring 230 is provided between the inner circumference of the collar and the outer circumference of the connecting cylinder.

[0046] In another embodiment, the assembly further includes: a guide post 130 radially disposed within the central mating hole 110; a guide cylinder 610 disposed at the lower end of the turning assembly 600 and extending into the central mating hole 110; and a spiral groove 630 disposed on the outer periphery of the guide cylinder 610 and adapted to the guide post 130; wherein, there are two sets of guide posts 130 and spiral grooves 630, and the guide posts 130 and spiral grooves 630 correspond one-to-one.

[0047] In another embodiment, horizontal extension sections 631 are provided at both ends of the spiral groove 630.

[0048] In another embodiment, a T-shaped operating block 620 is provided at the upper end of the twisting assembly 600.

[0049] In another embodiment, the expansion component 400 is formed by multiple arc-shaped blocks 410; a positioning ring 230 is provided at the lower end of the cap base 200, which is directly opposite to the annular support platform 120; the annular support platform 120 and the positioning ring 230 cooperate to limit the expansion component 400.

[0050] In another embodiment, the upper end of the arc-shaped block 410 is provided with a protrusion 411, and the lower end of the positioning ring 230 is provided with a limiting part 231 that cooperates with the protrusion.

[0051] In another embodiment, a plurality of support columns 240 are provided within the spacing, and the support columns 240 are fixedly supported between the cap seat 200 and the plug 100; a connecting piece 510 located within the spacing is provided at the upper end of the annular component 500, and the connecting piece is slidably fitted on the support column 240; a central circular hole 520 is provided on the connecting piece 510, and an annular groove 640 is provided on the outer wall of the guide cylinder 610 to rotatably engage with the central circular hole 520.

[0052] In another embodiment, the cap 200 and the plug 100 are provided with six sets of wire channels 700 that run through the height direction. Each wire channel 700 is provided with a cable 710. The lower end of each cable 710 is provided with a plug terminal 720. Among the six cables 710, three cables form a group, and the upper end of each group is connected to a three-phase connector 730.

[0053] In another embodiment, a lifting component 800 is rotatably mounted on the top of the cap base 200.

[0054] In summary, the present invention provides a shallow water production tree cap 1, which uses the twisting component 600 to drive the expansion component 400 to expand radially, thereby achieving the setting of the plug 100, simplifying the locking operation between the tree cap and the production tree body, and facilitating the disassembly and assembly by the ROV robot.

[0055] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A shallow-water oil extraction tree cap, characterized in that: The plug has an outer diameter that is compatible with the connecting cylinder at the top of the tree body. A center fitting hole is provided at the center of the upper end face of the plug, and an annular support platform is provided at the upper middle part of the outer periphery of the plug. The plug is used to be inserted into the connecting cylinder. A cap holder, which covers the plug and has a gap between it and the upper end face of the plug; an opening in the center of the cap holder corresponding to the central mating hole; as well as A locking ring groove is provided on the inner wall of the connecting cylinder; An expansion assembly, disposed on the annular support platform, is used to embed into the locking ring groove when radial expansion occurs, thereby setting the plug. An annular component, fitted onto the upper end of the plug, is used to insert between the expansion assembly and the plug, causing the expansion assembly to expand radially. Tighten the assembly so that its lower end extends into the central mating hole and is positioned above the annular component, for pressing down the annular component, so that the annular component is inserted between the expansion assembly and the plug, causing the expansion assembly to expand radially; The expansion assembly comprises: a guide post radially disposed within the central mating hole; a guide cylinder disposed at the lower end of the turning assembly and extending into the central mating hole; a spiral groove disposed on the outer periphery of the guide cylinder and adapted to the guide post; an expansion assembly composed of multiple arc-shaped blocks; a positioning ring corresponding to the annular support platform at the lower end of the cap seat; the annular support platform cooperating with the positioning ring to limit the expansion assembly; several sets of support posts within the spacing, the support posts being fixedly supported between the cap seat and the plug; a connecting piece located within the spacing at the upper end of the annular component, the connecting piece being slidably fitted onto the support post; a central circular hole on the connecting piece, and an annular groove on the outer wall of the guide cylinder rotatably engaging with the central circular hole.

2. The shallow-water oilfield tree cap according to claim 1, characterized in that, Also includes: A collar is disposed on the outer edge of the cap seat and extends downward, the inner circumference of the collar being adapted to the outer circumference of the connecting cylinder; A sealing ring is provided between the inner circumference of the collar and the outer circumference of the connecting cylinder.

3. The shallow water oil production tree cap according to claim 1 or 2, characterized in that: There are two sets of guide posts and spiral grooves, and the guide posts and spiral grooves correspond one-to-one.

4. The shallow water oil production tree cap according to claim 3, characterized in that: Horizontal extension sections are provided at both ends of the spiral groove.

5. The shallow water oil production tree cap according to claim 3, characterized in that: A T-shaped operating block is provided at the upper end of the twisting component.

6. The shallow water oil production tree cap according to claim 1, characterized in that: The upper end of the arc-shaped block is provided with a protrusion, and the lower end of the positioning ring is provided with a limiting part that cooperates with the protrusion.

7. The shallow water oil production tree cap according to claim 1, characterized in that: The cap and plug are provided with six sets of wire channels running along the height direction. Each wire channel is provided with a cable. The lower end of each cable is provided with a plug terminal. Among the six cables, three cables are grouped together, and the upper end of each group is connected to a three-phase connector.

8. The shallow water oil production tree cap according to claim 1, characterized in that: A lifting component is rotatably mounted on the top of the cap holder.

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