CN119801432A - Marine oil and gas underwater wellhead protection device and installation method thereof - Google Patents
Marine oil and gas underwater wellhead protection device and installation method thereof Download PDFInfo
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- CN119801432A CN119801432A CN202510041670.6A CN202510041670A CN119801432A CN 119801432 A CN119801432 A CN 119801432A CN 202510041670 A CN202510041670 A CN 202510041670A CN 119801432 A CN119801432 A CN 119801432A
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Abstract
The invention relates to an ocean oil gas underwater wellhead protection device and an installation method thereof, wherein the device comprises an outer protection structure fixed on a wellhead suction anchor, and an underwater wellhead head passes through the outer protection structure; the support structure is used for supporting and distributing external load and comprises a plurality of support frames which are arranged at intervals along the circumferential direction of the outer protective structure, and the stress rod piece structure is used for bearing the external load transmitted by the support structure and comprises a plurality of stress rods, and two ends of each stress rod are respectively detachably connected to the support frames and the side walls of the wellhead suction anchors. The invention solves the problem of stability possibly encountered by the marine oil and gas wellhead in a severe marine environment, adds extra protection and support for the connection area, obviously improves the bending resistance of the connection area, and further effectively enhances the overall stability of the underwater wellhead. The invention can adapt the ocean oil gas wellhead to more complex stormy wave and current environment and reduce the risk of offshore operation.
Description
Technical Field
The invention relates to the technical field of ocean oil and gas engineering, in particular to an underwater wellhead protection device for ocean oil and gas and an installation method thereof.
Background
Marine oil and gas development is often subjected to extreme environmental conditions, particularly in deep and ultra-deep water areas, and the influence of natural factors such as wind, waves, currents and the like is particularly remarkable. Strong waves and complex currents, especially in typhoon seasons and areas where internal wave currents frequently occur, bring great challenges to the stability and safety of marine oil and gas facilities. In soft areas of the seabed, deep water oil and gas development generally adopts an underwater suction anchor wellhead mode so as to improve the bearing capacity of an underwater wellhead.
To facilitate installation of large equipment underwater, the wellhead of the suction anchor wellhead is typically about 3 to 4 meters above the seabed, with the wellhead being connected to a blowout preventer system. During drilling operations, blowout preventer systems are subjected to large lateral ocean current forces due to their large volume and weight, as well as large frontal areas. In addition, the floating drilling platform (or ship) is subject to wind and wave to generate drift, and the acting force of the floating drilling platform (or ship) can be transmitted to the underwater wellhead through the marine riser, so that the stress and the instability of the suction anchor wellhead system are further increased. The suction anchor is buried in a submarine stratum and is transversely restrained by soil, and the bearing capacity is large, so that the suction anchor has good stability.
However, the area where the underwater wellhead is connected with the blowout preventer is exposed to the marine environment, the structural size is small, the bending resistance is weak, the load born is large, and instability or fatigue damage can be caused when the underwater wellhead is subjected to external forces such as stormy waves and the like for a long time. Therefore, special attention must be paid to the strength and durability of the critical connection region, and corresponding design measures must be taken to ensure the reliability and long-term stability of the overall structure.
In the ocean oil and gas exploitation process, the stability of a wellhead is directly related to operation safety and exploitation efficiency, so that the guarantee of wellhead stability is important. In marine engineering operations, conventional practice has generally increased the overall size of an underwater wellhead through theoretical calculations to increase its resistance to bending and stability. However, increasing the size of the subsea wellhead will result in an increase in the size of the lower connected surface conduit. This not only increases the cost significantly, but also the effect of the lifting is limited because the increase in the structural size is still limited. Therefore, there is a limit to simply increasing the wellhead size to improve stability.
Therefore, the inventor provides a marine oil-gas underwater wellhead protection device and a mounting method thereof by virtue of experience and practice of related industries for many years so as to overcome the defects of the prior art.
Disclosure of Invention
The invention aims to provide a marine oil gas underwater wellhead protection device and an installation method thereof, which overcome the problem of stability possibly encountered by a marine oil gas wellhead in a severe marine environment. The invention can adapt the ocean oil gas wellhead to more complex stormy wave and current environment and reduce the risk of offshore operation.
The invention aims at realizing the following, namely a marine oil-gas underwater wellhead protection device, which comprises:
an outer protection structure fixed on the wellhead suction anchor, through which the underwater wellhead head passes;
A support structure for supporting and distributing an external load, comprising a plurality of support frames arranged at intervals along the circumferential direction of the outer protective structure;
the bearing rod piece structure is used for bearing external load transmitted by the supporting structure and comprises a plurality of bearing rods, and two ends of each bearing rod are detachably connected to the supporting frame and the side wall of the wellhead suction anchor respectively.
In a preferred embodiment of the invention, the marine hydrocarbon subsea wellhead protection device comprises a retainer ring disposed between the marine hydrocarbon subsea wellhead protection device and a blowout preventer system for positioning the marine hydrocarbon subsea wellhead protection device in an axial direction of the subsea wellhead.
In a preferred embodiment of the present invention, the marine oil-gas underwater wellhead protection device comprises a guide structure, wherein the guide structure comprises a plurality of guide rods fixedly connected to the wellhead suction anchors and guide grooves formed in the support frames, and the guide rods respectively penetrate through the corresponding guide grooves.
In a preferred embodiment of the present invention, the bottom end of each guide rod is embedded in a reserved circular hole on the top surface of the wellhead suction anchor.
In a preferred embodiment of the present invention, the supporting frame is a triangular supporting frame, a right-angle side wall of the triangular supporting frame is fixedly connected with the outer protection structure, and another right-angle side wall of the triangular supporting frame is disposed along a radial direction of the outer protection structure.
In a preferred embodiment of the present invention, the outer protection structure comprises a cylindrical structure, the underwater wellhead penetrates through the cylindrical structure, and the side wall of the underwater wellhead is attached to the side wall of the cylindrical structure.
In a preferred embodiment of the invention, an inspection hole is arranged on the side wall of the cylindrical structure, and the inspection hole is used for monitoring the connection state of the underwater wellhead head and the marine oil and gas underwater wellhead protection device and/or forming a valve reserved space.
In a preferred embodiment of the present invention, two ends of each stress rod are respectively connected to the supporting frame and the side wall of the wellhead suction anchor through bolts.
The invention also aims to realize the installation method of the marine oil-gas underwater wellhead protection device, which comprises the following steps:
s1, lowering the device, namely lowering the assembled marine oil gas underwater wellhead protection device to a preset position of an underwater wellhead;
S2, positioning the device, namely positioning the marine oil-gas underwater wellhead protection device on the wellhead suction anchor through a guide structure of the marine oil-gas underwater wellhead protection device;
And S3, fixing devices, namely detachably connecting the bottom ends of the stress rods of the marine oil gas underwater wellhead protection devices to the side walls of the wellhead suction anchors.
In a preferred embodiment of the invention, the marine oil-gas underwater wellhead protection device is operated in an auxiliary manner by an underwater robot during the installation process.
By the above, the marine oil gas underwater wellhead protection device and the installation method thereof have the following beneficial effects:
The invention aims to enhance the stability of the junction of the suction pile underwater wellhead and the blowout preventer system (or the christmas tree), so that the junction can resist complex load conditions in the marine environment and the influence of the severe marine environment. The marine oil gas underwater wellhead protection device provides additional protection and support for the joint through the support structure and the stressed rod piece structure, so that the stability of the underwater wellhead is enhanced, and the device can be reused through the detachable connection of the stressed rod piece structure, so that the economic cost and the environmental influence are reduced. The guide rod disclosed by the invention is beneficial to the convenient installation of the marine oil-gas underwater wellhead protection device through the guide groove on the support frame, and meanwhile, the structural stability of the marine oil-gas underwater wellhead protection device is enhanced. The invention has simple design, easy disassembly and recovery after the operation is finished.
By the installation method, the marine oil gas underwater wellhead protection device can be efficiently and safely installed at the underwater wellhead, and powerful guarantee is provided for oil gas exploitation operation. The innovative installation method not only improves the operation efficiency, but also reduces the construction risk, and brings remarkable economic and environmental benefits for the exploration and development of marine oil and gas resources.
The invention is suitable for short-term drilling operation and can meet the requirement of long-term production operation.
Drawings
The following drawings are only for purposes of illustration and explanation of the present invention and are not intended to limit the scope of the invention.
Wherein:
FIG. 1 is an isometric view of a marine hydrocarbon subsea wellhead protection device of the present invention.
Fig. 2 is a front view of the marine hydrocarbon subsea wellhead protection device of the present invention.
FIG. 3 is a schematic view of the use of the marine hydrocarbon subsea wellhead protection device of the present invention.
In the figure:
100. an underwater wellhead protection device for ocean oil gas;
1. 11, checking holes;
2. a support structure, a support frame;
3. a stress rod structure; 31, a stress rod, 32, a bolt;
4. A fixing ring;
51. a guide bar 52, a guide groove;
6. A wellhead suction anchor;
7. an underwater wellhead;
8. A blowout preventer system;
9. Soil mass.
Detailed Description
For a clearer understanding of technical features, objects, and effects of the present invention, a specific embodiment of the present invention will be described with reference to the accompanying drawings.
The specific embodiments of the invention described herein are for purposes of illustration only and are not to be construed as limiting the invention in any way. Given the teachings of the present invention, one of ordinary skill in the related art will contemplate any possible modification based on the present invention, and such should be considered to be within the scope of the present invention. It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, mechanically or electrically connected, may be in communication with each other in two elements, may be directly connected, or may be indirectly connected through an intermediary, and the specific meaning of the terms may be understood by those of ordinary skill in the art in view of the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
As shown in fig. 1, 2 and 3, the present invention provides a marine oil and gas underwater wellhead protection device 100, which is disposed at a junction of an underwater suction anchor wellhead and a blowout preventer system 8 (or a christmas tree), and comprises:
The outer protective structure 1 is fixed on the wellhead suction anchor 6, and the underwater wellhead head 7 passes through the outer protective structure 1. The wellhead suction anchor 6 is buried in the soil body 9 of the submarine stratum, is transversely constrained by the soil body 9, has larger bearing capacity and has better stability.
The support structure 2 is used for supporting and distributing external loads and comprises a plurality of support frames 21 (which can be fixed on the outer protective structure 1 in a welding mode) arranged at intervals along the circumferential direction of the outer protective structure 1, and the support structure 2 is a main component of the marine oil-gas underwater wellhead protection device and mainly used for supporting and distributing the external loads and providing stability and strength of the structure.
The stress rod member structure 3 is configured to bear an external load transferred by the support structure 2, and includes a plurality of stress rods 31, where two ends of each stress rod 31 are detachably connected to the support frame 21 and a sidewall of the wellhead suction anchor 6, respectively. The stress rods 31 are key parts for bearing the maximum load and mainly bear external load, have high strength, are detachably connected with the underwater wellhead (such as bolted connection), are simple to operate, and can be replaced at any time if fatigue damage occurs under the action of long-time cyclic load.
The invention aims to enhance the stability of the joint of the suction pile underwater wellhead and the blowout preventer system, so that the joint can resist complex load conditions in the marine environment and resist the influence of severe marine environment (mainly typhoon weather and internal wave flow). The marine oil gas underwater wellhead protection device provides additional protection and support for the joint through the support structure 2 and the stress rod piece structure 3, so that the stability of the underwater wellhead is enhanced, and the device can be reused through the detachable connection of the stress rod piece structure 3, so that the economic cost and the environmental influence are reduced. The invention has simple design, easy disassembly and recovery after the operation is finished. The invention is suitable for short-term drilling operation and can meet the requirement of long-term production operation.
Further, as shown in fig. 1 and 2, to prevent the protector from moving up and down, the marine oil and gas underwater wellhead protector 100 includes a retainer ring 4, and the retainer ring 4 is disposed between the marine oil and gas underwater wellhead protector 100 and the blowout preventer system 8 for positioning the marine oil and gas underwater wellhead protector along the axial direction of the underwater wellhead 7. The height of the retainer ring 4 is related to the position of the blowout preventer system 8 after installation.
Further, as shown in fig. 1 and 2, in order to ensure accurate positioning and stable fixation of the device, the marine oil and gas underwater wellhead protection device 100 further comprises a guiding structure, wherein the guiding structure comprises a plurality of guiding rods 51 fixedly connected to the wellhead suction anchors 6 and guiding grooves 52 arranged on the supporting frames 21, and the guiding rods 51 respectively penetrate through the corresponding guiding grooves 52. The guide rod 51 is beneficial to the convenient installation of the marine oil and gas underwater wellhead protection device through the guide groove 52 on the support frame 21, and meanwhile, the structural stability of the marine oil and gas underwater wellhead protection device is enhanced.
Further, the bottom end of each guide rod 51 is embedded in a reserved round hole on the top surface of the wellhead suction anchor 6.
Further, as shown in fig. 1 and 2, the supporting frame 21 is a triangular supporting frame, a right-angle side wall of the triangular supporting frame is fixedly connected (e.g. welded) with the outer protection structure 1, and another right-angle side wall of the triangular supporting frame is radially arranged along the outer protection structure 1. In one embodiment, the number of the supporting frames 21 is 4, and the supporting frames are uniformly distributed around the outer protective structure 1 (cylindrical structure).
Further, as shown in fig. 1 and 2, the outer protective structure 1 comprises a cylindrical structure, the cylindrical structure is located on a step of an underwater wellhead, the underwater wellhead head 7 penetrates through the cylindrical structure, the side wall of the underwater wellhead head 7 is attached to the side wall of the cylindrical structure, an assembly gap between the two is controlled within 0.3mm, and corresponding size of the cylindrical structure is designed according to the size of the underwater wellhead head 7.
Further, as shown in fig. 1 and 2, the side wall of the cylindrical structure is provided with an inspection hole 11, the inspection hole is used for monitoring the connection state of the underwater wellhead 7 and the marine oil gas underwater wellhead protection device 100, a reserved space is provided for a valve on the side wall of the underwater wellhead, namely, a valve reserved space is formed, and meanwhile, the cylindrical structure is provided with holes, so that the overall weight of the device can be reduced.
Further, as shown in fig. 2, both ends of each of the stress rods 31 are connected to the side walls of the support frame 21 and the wellhead suction anchor 6 by bolts 32, respectively.
The invention also provides an installation method of the marine oil-gas underwater wellhead protection device 100, which comprises the following steps:
step S1, the device is lowered, namely the assembled marine oil gas underwater wellhead protection device 100 is lowered to a preset position of an underwater wellhead;
specifically, the marine hydrocarbon subsea wellhead protection device 100 is lowered slowly to a predetermined location of the subsea wellhead using a drill pipe or a wireline. In this process, an underwater Robot (ROV) may be used for assistance to ensure that the device is accurately placed at the target location.
S2, positioning the device, namely completing positioning of the marine oil-gas underwater wellhead protection device on the wellhead suction anchor through a guide structure of the marine oil-gas underwater wellhead protection device 100;
Specifically, the lower part of the marine oil and gas underwater wellhead protection device 100 realizes accurate positioning of the device through the cooperation of the guide rod 51 and the guide groove 52. This design ensures that the device can be stably secured to the wellhead, providing a reliable foundation for subsequent connection and securement.
And S3, fixing the device, namely detachably connecting the bottom ends of the stress rods 31 of the marine oil and gas underwater wellhead protection device 100 to the side walls of the wellhead suction anchors 6, wherein the state is shown in figure 3.
Specifically, the force-bearing rod 31 of the device is tightly combined with the wellhead suction anchor 6 through bolts, so that the device is fixed. This step is critical because it ensures that the device is able to withstand the loads from the superstructure, thereby improving the stability of the overall wellhead structure. The reuse of the device can be achieved subsequently by using an underwater Robot (ROV) to assist in replacing the force bar 31.
In the whole implementation process, the invention adopts an advanced underwater Robot (ROV) auxiliary technology, so that the lowering, positioning and fixing processes of the device are more accurate and efficient.
Through the steps, the marine oil gas underwater wellhead protection device 100 can be efficiently and safely installed at an underwater wellhead, and powerful guarantee is provided for oil gas exploitation operation. The innovative installation method not only improves the operation efficiency, but also reduces the construction risk, and brings remarkable economic and environmental benefits for the exploration and development of marine oil and gas resources.
By the above, the marine oil gas underwater wellhead protection device and the installation method thereof have the following beneficial effects:
The invention aims to enhance the stability of the joint of the suction pile underwater wellhead and the blowout preventer system, so that the joint can resist complex load conditions in the marine environment and resist the influence of the severe marine environment. The marine oil gas underwater wellhead protection device provides additional protection and support for the joint through the support structure and the stressed rod piece structure, so that the stability of the underwater wellhead is enhanced, and the device can be reused through the detachable connection of the stressed rod piece structure, so that the economic cost and the environmental influence are reduced. The guide rod disclosed by the invention is beneficial to the convenient installation of the marine oil-gas underwater wellhead protection device through the guide groove on the support frame, and meanwhile, the structural stability of the marine oil-gas underwater wellhead protection device is enhanced. The invention has simple design, easy disassembly and recovery after the operation is finished.
By the installation method, the marine oil gas underwater wellhead protection device can be efficiently and safely installed at the underwater wellhead, and powerful guarantee is provided for oil gas exploitation operation. The innovative installation method not only improves the operation efficiency, but also reduces the construction risk, and brings remarkable economic and environmental benefits for the exploration and development of marine oil and gas resources.
The invention is suitable for short-term drilling operation and can meet the requirement of long-term production operation.
The foregoing is illustrative of the present invention and is not to be construed as limiting the scope of the invention. Any equivalent changes and modifications can be made by those skilled in the art without departing from the spirit and principles of this invention, and are intended to be within the scope of this invention.
Claims (10)
1. An offshore oil and gas subsea wellhead protection device, comprising:
an outer protection structure fixed on the wellhead suction anchor, through which the underwater wellhead head passes;
A support structure for supporting and distributing an external load, comprising a plurality of support frames arranged at intervals along the circumferential direction of the outer protective structure;
the bearing rod piece structure is used for bearing external load transmitted by the supporting structure and comprises a plurality of bearing rods, and two ends of each bearing rod are detachably connected to the supporting frame and the side wall of the wellhead suction anchor respectively.
2. The marine hydrocarbon subsea wellhead protection device of claim 1, comprising a retainer ring disposed between the marine hydrocarbon subsea wellhead protection device and a blowout preventer system for positioning the marine hydrocarbon subsea wellhead protection device in an axial direction of the subsea wellhead.
3. The marine hydrocarbon subsea wellhead protection device of claim 2, comprising a guide structure comprising a plurality of guide rods fixedly connected to the wellhead suction anchors and guide slots provided on each of the support frames, each of the guide rods passing through a corresponding one of the guide slots.
4. The marine hydrocarbon subsea wellhead protection device of claim 3, wherein the bottom end of each guide rod is embedded within a reserved circular hole in the top surface of the wellhead suction anchor.
5. The marine hydrocarbon subsea wellhead protection device of claim 1, wherein the support frame is a delta support frame, a right-angle side wall of the delta support frame is fixedly connected with the outer protective structure, and another right-angle side wall of the delta support frame is disposed along a radial direction of the outer protective structure.
6. The marine hydrocarbon subsea wellhead protection device of claim 1, wherein the outer protective structure comprises a cylindrical structure, the subsea wellhead passes through the cylindrical structure, and a sidewall of the subsea wellhead is disposed in conforming relationship with a sidewall of the cylindrical structure.
7. The marine hydrocarbon subsea wellhead protection device of claim 6, wherein an inspection port is provided in a sidewall of the tubular structure for monitoring a state of connection of the subsea wellhead with the marine hydrocarbon subsea wellhead protection device and/or for constituting a valve headspace.
8. The marine hydrocarbon subsea wellhead protection device of claim 4, wherein each of the force bars has two ends that are bolted to the support frame and the sidewall of the wellhead suction anchor, respectively.
9. A method of installing a marine hydrocarbon subsea wellhead protection device as claimed in any one of claims 1 to 8 comprising:
s1, lowering the device, namely lowering the assembled marine oil gas underwater wellhead protection device to a preset position of an underwater wellhead;
S2, positioning the device, namely positioning the marine oil-gas underwater wellhead protection device on the wellhead suction anchor through a guide structure of the marine oil-gas underwater wellhead protection device;
And S3, fixing devices, namely detachably connecting the bottom ends of the stress rods of the marine oil gas underwater wellhead protection devices to the side walls of the wellhead suction anchors.
10. The method for installing the marine oil and gas underwater wellhead protection device according to claim 9, wherein the marine oil and gas underwater wellhead protection device is installed by adopting an underwater robot for auxiliary operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202510041670.6A CN119801432A (en) | 2025-01-10 | 2025-01-10 | Marine oil and gas underwater wellhead protection device and installation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202510041670.6A CN119801432A (en) | 2025-01-10 | 2025-01-10 | Marine oil and gas underwater wellhead protection device and installation method thereof |
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| CN119801432A true CN119801432A (en) | 2025-04-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202510041670.6A Pending CN119801432A (en) | 2025-01-10 | 2025-01-10 | Marine oil and gas underwater wellhead protection device and installation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120486978A (en) * | 2025-05-07 | 2025-08-15 | 安澜科技（江苏）股份有限公司 | Combined wellhead device for petroleum drilling and installation method thereof |
-
2025
- 2025-01-10 CN CN202510041670.6A patent/CN119801432A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120486978A (en) * | 2025-05-07 | 2025-08-15 | 安澜科技（江苏）股份有限公司 | Combined wellhead device for petroleum drilling and installation method thereof |
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