Typhoon resistant riser support system and method of use

Abstract

The present application relates to a kind of typhoon can be released with platform's water isolation sleeve support system and its use method, wherein, typhoon can be released with platform's water isolation sleeve support system for supporting the water isolation sleeve of subsea well, subsea well is configured with deepwater self-elevating production platform around, the deepwater self-elevating production platform includes hull, the water isolation sleeve support system includes moving mechanism, bottom foundation and water isolation sleeve support frame, moving mechanism is set on the deck of hull;Bottom foundation is set to the sea bottom near deepwater self-elevating production platform;The bottom end of water isolation sleeve support frame is detachably connected on the bottom foundation, and the top end of water isolation sleeve support frame is connected with hull by moving mechanism.When typhoon is encountered, the moving mechanism releases water isolation sleeve support frame, realizes that water isolation sleeve support frame is quickly released from deepwater self-elevating production platform when typhoon is encountered;When deepwater self-elevating production platform moves or reinstallation, the moving mechanism will water isolation sleeve support frame be lifted to the deck of hull, realize that deepwater self-elevating production platform is moved together with water isolation sleeve support frame and reinstallation.

Description

Technical Field

[0001] This invention relates to the field of oil and gas exploration and development technology, specifically to a water-proof casing support system that can be detached from the platform during typhoons and its usage method. Background Technology

[0002] my country has many marginal oilfields with water depths ranging from 80 to 120 meters, small but widely distributed reserves, and no nearby wellhead platforms. The development of these marginal oilfields faces not only the challenge of deep water but also the impact of typhoons. When a typhoon passes near an oilfield, the resulting strong winds and large waves can impose significant environmental loads on oil and gas production platforms. This extreme weather poses a considerable threat to platform safety.

[0003] Drawing on the experience of shallow-water jack-up production platforms, deep-water jack-up platforms with triangular truss-type legs can be used as production platforms for offshore marginal oilfield development. Utilizing the platform's self-installation capabilities, offshore installation can be achieved using its own lifting system, eliminating the need for large-scale installation resources and significantly reducing offshore installation investment. However, compared to traditional jacket platforms in water depths of around 100 meters, jack-up platforms have weaker structural rigidity and face greater safety risks in the event of typhoons.

[0004] Currently, these marginal oil fields have deep water and are frequently affected by typhoons. In order to avoid typhoons, the jack-up production platform needs to leave the typhoon-affected area. However, the existing riser must rely on the jack-up production platform to stand in the sea. As a result, if the jack-up production platform leaves during a typhoon, the riser cannot stand alone due to lack of support. Summary of the Invention

[0005] To address the aforementioned problems, the purpose of this invention is to provide a waterproof sleeve support system that can detach from the platform during typhoons and its usage method, thereby solving the problem that the waterproof sleeve cannot stand independently due to lack of support when the self-elevating production platform leaves during a typhoon.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention discloses a riser support system that can detach from a platform in the event of a typhoon, used to support a riser casing at a subsea oil well. A deep-water jack-up production platform is configured around the subsea oil well, the deep-water jack-up production platform comprising a hull, and the riser support system comprising: A movable mechanism is installed on the deck of the hull; The bottom foundation is located on the seabed near the deep-water jack-up production platform. The bottom end of the water-proof sleeve support frame is detachably connected to the bottom foundation, and the top end of the water-proof sleeve support frame is connected to the hull through the moving mechanism. Among them, the riser support frame is used to install the riser, the riser passes through the riser support frame, its bottom end is fixedly connected to the subsea oil well, and its top end is connected to the inlet of the Christmas tree of the deep-water self-elevating production platform. When a typhoon occurs, the mobile mechanism releases the riser support frame, leaving the riser support frame and the riser inside it on the bottom foundation. The deep-water jack-up production platform is then moved to separate from the riser support frame, enabling the riser to be quickly detached from the deep-water jack-up production platform during a typhoon. When the deep-water jack-up production platform is relocated or reinstalled, after the riser is cut and retrieved, the mobile mechanism lifts the riser support frame onto the deck of the hull, allowing the deep-water jack-up production platform to be relocated and reinstalled together with the riser support frame.

[0007] Preferably, the bottom foundation includes a base, four columns, several crossbars, and several first diagonal braces. The base rests on the seabed. The four columns are fixed to the base. Each adjacent column is connected by a crossbar, and the four crossbars on the same horizontal plane are connected end to end to form a rectangle. Each vertical surface where two adjacent columns of the bottom foundation are located is provided with a first diagonal brace, and the two ends of the first diagonal brace are respectively fixed to two columns on the vertical surface where the adjacent columns of the bottom foundation are located.

[0008] Preferably, the waterproof sleeve support frame includes four uprights, several crossbars, and several second diagonal braces. The tops of the four uprights of the waterproof sleeve support frame extend upwards above the sea surface. Each adjacent upright is connected by a crossbar, and the four crossbars on the same horizontal plane are connected end to end to form a rectangle. A second diagonal brace is provided on the vertical surface where each pair of adjacent uprights of the waterproof sleeve support frame is located, and the two ends of the second diagonal brace are respectively fixed to the two uprights on the vertical surface where the adjacent uprights of the waterproof sleeve support frame are located.

[0009] Preferably, the top of each column of the bottom foundation is set as a flared opening, and the bottom column of the water-proof sleeve support frame is set as a pointed tip. The pointed tip of the bottom of the water-proof sleeve support frame is inserted into the flared opening at the top of the bottom foundation, thereby realizing the insertion of the bottom of the water-proof sleeve support frame and the top of the bottom foundation.

[0010] Preferably, the bottom ends of the four columns of the waterproof sleeve support frame and the top ends of the four columns of the bottom foundation are all equipped with connecting plates. The connecting plates are provided with pin holes. The pin holes of the connecting plates at the bottom end of the waterproof sleeve support frame and the top end of the bottom foundation are aligned and a pin is inserted, thereby realizing the pin connection between the bottom end of the waterproof sleeve support frame and the top end of the bottom foundation.

[0011] Preferably, the moving mechanism includes two bottom guide rails, a limiting truss, and a lifting system. A moon pool hole is opened on the deck of the hull, and the watertight sleeve support frame passes through the moon pool hole. The two bottom guide rails are respectively fixed on both sides of the moon pool hole, and the two ends of the limiting truss are respectively set on the bottom guide rails. The lifting system includes four motors, each motor is equipped with a slider, and the sliders of the four motors are respectively set on the two bottom guide rails. A gear is provided on the output shaft of each motor, and racks are provided on the entire outer wall of the four columns of the watertight sleeve support frame. The gears of the four motors mesh with the racks of the four columns of the watertight sleeve support frame. Among them, the two bottom guide rails work in conjunction with the sliders of the four motors of the lifting system to correct the positioning error of the water-proof sleeve support frame on the deep-water self-elevating production platform. A limiting truss is used to restrict the movement or release of the water-proof sleeve support frame away from the moon pool hole; The lifting system is used to lift or lower the riser sleeve support frame, so as to install the riser sleeve support frame on the bottom foundation or separate the riser sleeve support frame from the bottom foundation.

[0012] Secondly, the present invention also discloses a method for using a waterproof sleeve support system that can be detached from the platform during typhoons. The waterproof sleeve support system described above includes: Installation of the water-proof sleeve support frame; After the installation of the riser support frame is completed, in the absence of a typhoon, keep the bottom end of the riser fixedly connected to the subsea oil well and the top end connected to the inlet of the Christmas tree of the deep-water jack-up production platform. In the event of a typhoon requiring evacuation, the typhoon-prone water-proof sleeve support frame can be freed from the deep-water self-elevating production platform. After the typhoon, the deepwater jack-up production platform is towed back to its original operating position, and the installation steps of the riser support frame are repeated to reconnect the riser support frame with the moving mechanism and the riser casing with the inlet of the deepwater jack-up production platform's Christmas tree; and Relocation of the water-proof sleeve support frame.

[0013] Specifically, the installation method of the water-proof sleeve support frame includes: Installation of the water-proof sleeve support frame on the bottom foundation: First, start the four motors of the lifting system and lower the water-proof sleeve support frame close to the bottom foundation until the water-proof sleeve support frame and the bottom foundation are aligned through the flared opening; then, after the pin holes of the connecting plates of the bottom foundation and the water-proof sleeve support frame are aligned, insert the pin shaft through the pin holes of the connecting plates of the bottom foundation and the water-proof sleeve support frame to complete the connection between the water-proof sleeve support frame and the bottom foundation; finally, close the upper limit truss to restrict the water-proof sleeve support frame from moving away from the moon pool hole, thus realizing the installation of the water-proof sleeve support frame on the bottom foundation; Install riser casing: Lower the riser casing through the riser casing support frame, so that the bottom end of the riser casing is fixedly connected to the subsea oil well, and the top end of the riser casing is connected to the inlet of the Christmas tree of the deepwater jack-up production platform.

[0014] Specifically, when evacuation is required due to a typhoon, the method for detaching the typhoon-prone water-proof sleeve support frame from the deep-water self-elevating production platform includes: Open the limit truss; The deep-water self-elevating production platform was towed away from the typhoon-affected area by tugboats. The moon pool opening on the deck of the hull was removed from the riser support frame, and the riser support frame and riser were left on the bottom foundation to resist the typhoon. The mobile deep-water self-elevating production platform is separated from the riser support frame, enabling the riser support frame to be detached from the deep-water self-elevating production platform during typhoons. After the typhoon, the deep-water jack-up production platform was towed back to its original operating position using tugboats, allowing the riser support frame to return to the moon pool opening and restoring the connection between the riser support frame and the hull. This process included the following specific steps: Adjust the positions of the sliders of the four motors so that the gears of the four motors mesh with the racks of the four columns of the water-proof sleeve support frame respectively; Lower the limiting truss so that both ends of the limiting truss are slidably mounted on the bottom guide rail.

[0015] Specifically, when relocating a deep-water jack-up production platform, the relocation method for the watertight sleeve support frame includes: Cut the riser casing near the seabed mud surface and retrieve the riser casing; The process of recovering the riser support frame by lifting the system includes the following specific steps: First, remove the pin from the pin hole of the connecting piece between the bottom foundation and the riser support frame; then, start the four motors of the lifting system. The gears on the output shafts of the four motors drive the four columns of the riser support frame to move upward, thereby raising the riser support frame away from the bottom foundation until the riser support frame is raised onto the deck of the ship. Use tugboats to tow away the deepwater jack-up production platform, and move the deepwater jack-up production platform together with the riser support frame until it is moved to the target oilfield location. Repeat the installation method of the water-proof sleeve support frame to reinstall the water-proof sleeve support frame.

[0016] Compared with the prior art, the beneficial effects of the present invention are: (i) This invention discloses a waterproof sleeve support system that can be detached from the platform in the event of a typhoon and its usage method. When a typhoon occurs, the moving mechanism releases the waterproof sleeve support frame, leaving the waterproof sleeve support frame and the waterproof sleeve inside it on the bottom foundation. The deep-water self-elevating production platform is then moved to separate it from the waterproof sleeve support frame, thereby enabling the waterproof sleeve to be quickly detached from the deep-water self-elevating production platform in the event of a typhoon. The water-proof casing support system disclosed in this invention can be detached from the platform in the event of a typhoon. It is applied to the water-proof casing of a subsea oil well. A deep-water jack-up production platform is configured around the subsea oil well. When a typhoon occurs, the water-proof casing support system separates from the deep-water jack-up production platform. The deep-water jack-up production platform is towed away from the sea area affected by the typhoon, while the water-proof casing and its support structure remain in place to resist the typhoon. This allows the water-proof casing to be quickly detached from the deep-water jack-up production platform, thereby allowing the deep-water jack-up production platform to avoid the typhoon. This solves the problem that the water-proof casing cannot stand independently due to lack of support after the jack-up production platform leaves during a typhoon.

[0017] (II) This invention discloses a riser support system that can be detached from the platform during typhoons and its usage method. When a deep-water jack-up production platform is relocated or reinstalled, after the riser is cut and retrieved, the moving mechanism lifts the riser support frame onto the deck of the hull, enabling the deep-water jack-up production platform to be relocated and reinstalled together with the riser support frame. The riser support system disclosed in this invention, which can be detached from the platform during typhoons, not only allows the riser support frame to be detached from the hull but can also be installed and relocated as an integral part of the hull.

[0018] In addition, it has the following advantages: 1. The riser support system proposed in this invention consists of three parts: a moving mechanism, a bottom foundation, and a riser support frame. It can achieve self-installation and typhoon release of the riser support frame. The self-installation of the riser support frame can significantly reduce offshore installation investment, and it can also be released during typhoons, which can effectively prevent the safety of the self-installed production platform from being affected by typhoons.

[0019] 2. The bottom foundation and the water-proof sleeve support frame proposed in this invention are respectively provided with a flared mouth and a plug tip to facilitate the connection between the two during installation; at the same time, a connecting piece and a pin are provided to ensure the structural connection between the two sections.

[0020] 3. The present invention provides a moving mechanism with a bottom guide rail on the main hull, and a lifting system on the moving mechanism. The lifting system enables the self-installation of the water-proof sleeve support frame, the moving mechanism enables the connection and typhoon release of the water-proof sleeve support system, and the bottom guide rail can compensate for the positioning error of the self-installation production platform.

[0021] 4. This invention enables the self-installation and typhoon relief of the water-proof sleeve support frame. Since the main structure of the self-installation production platform can avoid typhoons, compared with the design to resist typhoons, the structure of the pile legs, hull, pile shoes, etc. can adopt a smaller span and weaker rigidity, thereby greatly reducing the amount of steel used in the platform and reducing the investment and difficulty of platform construction.

[0022] 5. The bottom foundation of this invention is fixed to the seabed by a pile foundation. This design is only a typical form, and other foundation fixing forms can also be used, such as suction penetration cylindrical foundations, etc.

[0023] 6. This invention enables deep-water jack-up production platforms to quickly detach during typhoon conditions and rapidly reconnect and resume production after the typhoon. Based on this, the platform's main structure can be designed for milder environmental conditions, completely avoiding the impact of typhoons during oilfield production and improving platform safety. Attached Figure Description Figure 1 This is a side view of the waterproof sleeve support system that can be detached from the platform in the event of a typhoon, as provided in Embodiment 1 of the present invention. Figure 2 This is a schematic diagram of the connection between the water-proof sleeve support frame D and the bottom foundation C provided in Embodiment 1 of the present invention; Figure 3 This is a top view of the deep-water self-elevating production platform provided in Embodiment 1 of the present invention; Figure 4 yes Figure 3 A magnified view of the Ω area in the image.

[0024] Explanation of reference numerals in the attached drawings: A - hull, A1 - leg, A2 - shoe; B-Moving mechanism, B1-Bottom guide rail, B2-Limiting truss, B3-Lifting system.

[0025] C - Bottom base, C0 - Base, C1 - Flare opening; D-Waterproof sleeve support frame; E1 - Connecting piece, E2 - Pin. Detailed Implementation

[0026] Exemplary embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the invention and to fully convey the scope of the invention to those skilled in the art.

[0027] To address the issue that the riser casing cannot stand independently due to lack of support when a jack-up production platform leaves during a typhoon, this invention discloses a riser casing support system that can detach from the platform during a typhoon. Since the riser casing is directly connected to the subsea oil well, the deep-water jack-up production platform cannot cut off the riser casing when detaching during a typhoon. Furthermore, the riser casing itself cannot stand independently in deep-sea and typhoon conditions, and must rely on the riser casing support system to provide sufficient stability.

[0028] Example 1: A waterproof sleeve support system that can be detached from the platform during typhoons Embodiment 1 of the present invention provides a waterproof sleeve support system that can be detached from the platform in the event of a typhoon. Its structure will be described in detail below with reference to the accompanying drawings.

[0029] refer to Figure 1 The riser support system, which can be detached from the platform in the event of a typhoon, is used to support the riser casing of the subsea oil well. A deep-water jack-up production platform is configured around the subsea oil well. The deep-water jack-up production platform includes a hull A. The riser support system, which can be detached from the platform in the event of a typhoon, includes a moving mechanism B, a bottom foundation C, and a riser support frame D.

[0030] The deep-water jack-up production platform is equipped with several legs A1, and each leg A1 has a footshoe A2 at its bottom. The footshoe A2 extends into the seabed below the deep-water jack-up production platform, and the top of each leg A1 is fixedly connected to the deep-water jack-up production platform to support it.

[0031] Hull A is located on the sea surface near the deep-water self-elevating production platform, and a moving mechanism B is installed on hull A; The bottom foundation C is located on the seabed near the deep-water jack-up production platform. Specifically, the bottom foundation C is pre-installed on the seabed. The bottom end of the riser sleeve support frame D is detachably connected to the bottom foundation C, and the top end of the riser sleeve support frame D is connected to the hull A through the moving mechanism B. Among them, the riser support frame D is used to install the riser casing. The riser casing passes through the riser support frame D, and its bottom end is fixedly connected to the subsea oil well, and its top end is connected to the inlet of the Christmas tree of the deep-water self-elevating production platform.

[0032] refer to Figure 2 The base C includes a base C0, four uprights, and several crossbars. The base C0 is situated on the seabed; Four columns are fixed to the base C0; Each adjacent column is connected by a horizontal bar, and the four horizontal bars on the same horizontal plane are connected end to end to form a rectangle.

[0033] To enhance stability, the bottom foundation C also includes several first diagonal braces. Each pair of adjacent columns of the bottom foundation C is provided with a first diagonal brace, and the two ends of the first diagonal brace are respectively fixed to the two columns on the vertical surface of the adjacent columns of the bottom foundation C.

[0034] To provide a typhoon-resistant foundation for the entire riser support system and the riser itself, the bottom foundation C is fixed and pre-installed on the seabed by piling. Specifically, the base C0 comprises several piles, each anchored into the seabed.

[0035] Continue to refer to Figure 2 The riser sleeve support frame D includes four uprights and several crossbars. The tops of the four columns of the riser sleeve support frame D extend upwards above the sea surface. Each adjacent column is connected by a horizontal bar, and the four horizontal bars on the same horizontal plane are connected end to end to form a rectangle.

[0036] To enhance stability, the riser sleeve support frame D also includes several second diagonal braces. Each pair of adjacent columns of the riser sleeve support frame D is provided with a second diagonal brace, and the two ends of the second diagonal brace are respectively fixed to the two columns on the vertical surface of the adjacent columns of the riser sleeve support frame D.

[0037] Thus, the four columns, several horizontal bars, and several second diagonal braces together form the truss structure of the waterproof sleeve support frame D, which is used to install the waterproof sleeve.

[0038] refer to Figure 3 and Figure 4 To facilitate the alignment and connection of the bottom foundation C and the water-proof sleeve support frame D during installation, firstly, the top of each column of the bottom foundation C is set as a flared mouth C1, and the bottom column of the water-proof sleeve support frame D is set as a pin. The pin at the bottom of the water-proof sleeve support frame D is inserted into the flared mouth C1 at the top of the bottom foundation C, thereby realizing the insertion connection between the bottom of the water-proof sleeve support frame D and the top of the bottom foundation C.

[0039] Secondly, in order to further enhance the stability of the connection between the bottom end of the riser sleeve support D and the top end of the bottom foundation C, the bottom end of the riser sleeve support D and the top end of the bottom foundation C are also connected by a pin.

[0040] Specifically, the pin connection includes a connecting piece E1 and a pin E2. The bottom ends of the four columns of the waterproof sleeve support frame D and the top ends of the four columns of the bottom foundation C are all equipped with connecting pieces E1. The connecting pieces E1 are provided with pin holes. The pin holes of the connecting pieces E1 at the bottom end of the waterproof sleeve support frame D and the top end of the bottom foundation C are aligned, and the pins E2 are inserted to realize the pin connection between the bottom end of the waterproof sleeve support frame D and the top end of the bottom foundation C.

[0041] The plug-in and pin-shaft connections together form the docking form between the bottom end of the water-proof sleeve support frame D and the top end of the bottom foundation C.

[0042] The method to connect the bottom end of the waterproof sleeve support frame D with the top end of the bottom foundation C is as follows: After the deep-water self-elevating production platform is installed and in place, firstly, the water-proof sleeve support frame D and the bottom foundation C are aligned through the flared mouth C1; secondly, after the pin holes of the connecting piece E1 of the bottom foundation C and the water-proof sleeve support frame D are aligned, the pin shaft E2 is then inserted through the pin hole of the connecting piece E1 of the bottom foundation C and the water-proof sleeve support frame D to complete the connection between the water-proof sleeve support frame D and the bottom foundation C.

[0043] Continue to refer to Figure 4 The moving mechanism B includes two bottom guide rails B1, a limiting truss B2, and a lifting system B3. A moon pool opening is provided on the deck of hull A, and a watertight sleeve support frame D is installed inside the moon pool opening; Two bottom guide rails B1 are fixed on both sides of the moon pool hole, and the two ends of the limiting truss B2 are respectively set on the bottom guide rails B1. The lifting system B3 includes four motors, each equipped with a slider. The sliders of the four motors are respectively set on two bottom guide rails B1. Each motor has a gear on its output shaft. The entire outer wall of the four columns of the water-proof sleeve support frame D is equipped with racks. The gears of the four motors mesh with the racks of the four columns of the water-proof sleeve support frame D. Among them, the two bottom guide rails B1 work in conjunction with the sliders of the four motors of the lifting system B3 to enable the water-proof sleeve support frame D to move left and right in the horizontal direction, which is used to correct the positioning error of the water-proof sleeve support frame D on the deep-water self-elevating production platform. Limiting truss B2 is used to restrict the movement of the water-proof sleeve support frame D away from the moon pool hole; The lifting system B3 is used to lift or lower the riser sleeve support frame D, so as to install the riser sleeve support frame D on the bottom foundation C or separate the riser sleeve support frame D from the bottom foundation C.

[0044] The installation of the water-proof sleeve support frame D on the bottom foundation C includes: First, starting the four motors of the lifting system B3 and lowering the water-proof sleeve support frame D close to the bottom foundation C until the water-proof sleeve support frame D and the bottom foundation C are aligned through the flared opening C1; then, after the pin holes of the connecting piece E1 of the bottom foundation C and the water-proof sleeve support frame D are aligned, the pin shaft E2 is inserted through the pin holes of the connecting piece E1 of the bottom foundation C and the water-proof sleeve support frame D to complete the docking between the water-proof sleeve support frame D and the bottom foundation C; finally, closing the upper limit truss B2 to restrict the movement of the water-proof sleeve support frame D away from the moon pool hole, thus realizing the installation of the water-proof sleeve support frame D on the bottom foundation C.

[0045] Next, the riser casing is installed, including: lowering the riser casing through the riser casing support frame D, so that the bottom end of the riser casing is fixedly connected to the subsea oil well, and the top end of the riser casing is connected to the inlet of the Christmas tree of the deepwater jack-up production platform.

[0046] When evacuation is required due to a typhoon, the limiting truss B2 is opened, and the deep-water self-elevating production platform is towed away by tugboats. The moon pool hole on the deck of hull A leaves the riser support frame D, leaving the riser support frame D on the bottom foundation C. The riser support frame D is separated from the deep-water self-elevating production platform, thus achieving the separation of the riser support frame D from the deep-water self-elevating production platform during a typhoon. When the deep-water jack-up production platform is relocated, the riser sleeve is cut off and retrieved. The riser sleeve support frame D is transported back to the deck of the hull A via the moving mechanism B, away from the bottom foundation C, so that the deep-water jack-up production platform and the riser sleeve support frame D can be relocated and reinstalled together.

[0047] The riser support frame D is connected to the hull A of the deep-water jack-up production platform via a moving mechanism B. When evacuation is required due to a typhoon, the moving mechanism B releases the riser support frame D, leaving it and the riser inside on the bottom foundation C. The riser support frame D is then separated from the deep-water jack-up production platform, enabling the riser to be quickly detached from the platform during a typhoon. When the deep-water jack-up production platform is relocated or reinstalled, after the riser is cut and retrieved, the moving mechanism B lifts the riser support frame D onto the deck of hull A, allowing the deep-water jack-up production platform to be relocated and reinstalled together with the riser support frame D.

[0048] The main body of the deep-water self-installing production platform can avoid the impact of typhoons thanks to this invention, which can effectively reduce the construction cost of the platform body and significantly improve its safety. Furthermore, except for the bottom foundation C, the rest of the platform can be reused across different oilfields. By sharing the construction cost across multiple oilfields, the economic efficiency of each individual oilfield can be further improved.

[0049] Example 2: Method of using a waterproof sleeve support system that can be detached from the platform during a typhoon Embodiment 2 of the present invention provides a method for using a waterproof sleeve support system that can be detached from the platform during typhoons. The method employs the waterproof sleeve support system of Embodiment 1, which can be detached from the platform during typhoons. The method includes: Installation of the riser sleeve support frame D; After the installation of riser support frame D is completed, in the absence of typhoons, keep the bottom end of the riser fixedly connected to the subsea oil well and the top end connected to the inlet of the Christmas tree of the deepwater jack-up production platform. In the event of a typhoon requiring evacuation, the typhoon-prone water-proof sleeve support frame D is detached from the deep-water self-elevating production platform. Specifically, this involves leaving the water-proof sleeve support frame D on the bottom foundation C, moving the deep-water self-elevating production platform to separate it from the water-proof sleeve support frame D, thus detaching the water-proof sleeve support frame D from the deep-water self-elevating production platform. After the typhoon, the deepwater jack-up production platform is towed back to its original operating position, and the installation steps of the riser support frame D are repeated to reconnect the riser support frame D with the moving mechanism B and the riser casing with the inlet of the deepwater jack-up production platform's Christmas tree; and Relocation of the water-proof sleeve support frame D.

[0050] As one specific implementation method, the installation method of the water-proof sleeve support frame D includes: Installation of the water-proof sleeve support frame D on the bottom foundation C: First, start the four motors of the lifting system B3 and lower the water-proof sleeve support frame D. The water-proof sleeve support frame D is close to the bottom foundation C until the water-proof sleeve support frame D and the bottom foundation C are aligned through the flared opening C1. Then, after the pin holes of the connecting piece E1 of the bottom foundation C and the water-proof sleeve support frame D are aligned, the pin shaft E2 is inserted through the pin holes of the connecting piece E1 of the bottom foundation C and the water-proof sleeve support frame D to complete the docking between the water-proof sleeve support frame D and the bottom foundation C. Finally, close the upper limit truss B2 to restrict the water-proof sleeve support frame D from moving away from the moon pool hole, thus realizing the installation of the water-proof sleeve support frame D on the bottom foundation C. Install riser casing: Lower the riser casing through the riser casing support frame D, so that the bottom end of the riser casing is fixedly connected to the subsea oil well, and the top end of the riser casing is connected to the inlet of the Christmas tree of the deepwater jack-up production platform.

[0051] As a specific implementation method, when evacuation is required due to a typhoon, the method for detaching the typhoon-prone water-proof sleeve support frame D from the deep-water self-elevating production platform includes: Open the limiting truss B2; Use tugboats to tow the deep-water self-elevating production platform away from the typhoon-affected area. The moon pool hole on the deck of hull A is removed from the riser support frame D, and the riser support frame D and the riser remain on the bottom foundation C to resist the typhoon. The mobile deep-water self-elevating production platform is separated from the riser support frame D, so that the riser support frame D can be freed from the deep-water self-elevating production platform in the event of a typhoon. After the typhoon, the deep-water jack-up production platform was towed back to its original operating position using tugboats, allowing the riser support frame D to return to the moon pool opening and restoring the connection between the riser support frame D and the hull A. This process included the following specific steps: Adjust the positions of the sliders of the four motors so that the gears of the four motors mesh with the racks of the four columns of the water-proof sleeve support frame D respectively; Lower the limiting truss B2 so that both ends of the limiting truss B2 are slidably mounted on the bottom guide rail B1.

[0052] As a specific implementation method, when relocating a deep-water jack-up production platform, the relocation method of the watertight sleeve support frame D includes: Cut the riser casing near the seabed mud surface and retrieve the riser casing; The process of recovering the riser support frame D by lifting system B3 includes the following specific steps: First, remove the pin E2 from the pin hole of the connecting piece E1 between the bottom foundation C and the riser support frame D; then, start the four motors of lifting system B3. The gears on the output shafts of the four motors drive the four columns of the riser support frame D to move upward, thereby raising the riser support frame D away from the bottom foundation C until the riser support frame D is raised onto the deck of hull A. Use tugboats to tow away the deepwater jack-up production platform, and move the deepwater jack-up production platform together with the riser support frame D until it is moved to the target oilfield location. Repeat the installation method of the water-proof sleeve support frame D to reinstall the water-proof sleeve support frame D.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A riser support system that can detach from a platform during typhoons, used to support the riser casing of a subsea oil well, wherein a deep-water jack-up production platform is configured around the subsea oil well, the deep-water jack-up production platform comprising a hull (A), characterized in that, include: A moving mechanism (B) is installed on the deck of the hull (A); The bottom foundation (C) is located on the seabed near the deep-water jack-up production platform; The bottom end of the riser sleeve support frame (D) is detachably connected to the bottom foundation (C), and the top end of the riser sleeve support frame (D) is connected to the hull (A) through the moving mechanism (B). Among them, the riser support frame (D) is used to install the riser casing. The riser casing passes through the riser support frame (D), and its bottom end is fixedly connected to the subsea oil well, and its top end is connected to the inlet of the Christmas tree of the deep-water jack-up production platform. When a typhoon occurs, the mobile mechanism (B) releases the riser support frame (D), leaving the riser support frame (D) and the riser inside it on the bottom foundation (C). The deep-water jack-up production platform is then moved to separate from the riser support frame (D), enabling the riser to be quickly detached from the deep-water jack-up production platform during a typhoon. When the deep-water jack-up production platform is relocated or reinstalled, after the riser is cut and retrieved, the mobile mechanism (B) lifts the riser support frame (D) onto the deck of the hull (A), enabling the deep-water jack-up production platform to be relocated and reinstalled together with the riser support frame (D).

2. The waterproof sleeve support system that can detach from the platform in the event of a typhoon, as described in claim 1, is characterized in that... The bottom foundation (C) includes a base (C0), four columns, several horizontal bars, and several first diagonal braces. The base (C0) sits on the seabed; Four columns are fixed to the base (C0); Each adjacent column is connected by a horizontal bar, and the four horizontal bars on the same horizontal plane are connected end to end to form a rectangle; A first diagonal brace is provided on the vertical surface where each pair of adjacent columns of the bottom foundation (C) is located, and the two ends of the first diagonal brace are respectively fixed to the two columns on the vertical surface where the adjacent columns of the bottom foundation (C) are located.

3. The waterproof sleeve support system that can detach from the platform in the event of a typhoon, as described in claim 2, is characterized in that... The water-proof sleeve support frame (D) includes four columns, several horizontal bars, and several second diagonal braces. The tops of the four columns of the water-proof sleeve support frame (D) extend upwards to the sea surface. Each adjacent column is connected by a horizontal bar, and the four horizontal bars on the same horizontal plane are connected end to end to form a rectangle. The water-proof sleeve support frame (D) is provided with a second diagonal brace on the vertical surface where each pair of adjacent columns are located, and the two ends of the second diagonal brace are respectively fixed to the two columns on the vertical surface where the adjacent columns of the water-proof sleeve support frame (D) are located.

4. The waterproof sleeve support system that can detach from the platform in the event of a typhoon, as described in claim 3, is characterized in that... The top of each column of the bottom foundation (C) is set as a flared mouth (C1), and the bottom column of the water-proof sleeve support frame (D) is set as a tip. The tip of the bottom of the water-proof sleeve support frame (D) is inserted into the flared mouth (C1) at the top of the bottom foundation (C), thereby realizing the insertion of the bottom of the water-proof sleeve support frame (D) and the top of the bottom foundation (C).

5. The waterproof sleeve support system that can detach from the platform in the event of a typhoon, as described in claim 4, is characterized in that... The bottom ends of the four columns of the waterproof sleeve support frame (D) and the top ends of the four columns of the bottom foundation (C) are all equipped with connecting plates (E1). The connecting plates (E1) are provided with pin holes. The pin holes of the connecting plates (E1) at the bottom end of the waterproof sleeve support frame (D) and the top end of the bottom foundation (C) are aligned and a pin shaft (E2) is inserted, thereby realizing the pin shaft connection between the bottom end of the waterproof sleeve support frame (D) and the top end of the bottom foundation (C).

6. The waterproof sleeve support system that can be detached from the platform in the event of a typhoon, as described in claim 5, is characterized in that... The moving mechanism (B) includes two bottom guide rails (B1), a limiting truss (B2), and a lifting system (B3). A moon pool opening is provided on the deck of the hull (A), and a watertight sleeve support frame (D) is installed inside the moon pool opening; Two bottom guide rails (B1) are fixed on both sides of the moon pool hole, and the two ends of the limiting truss (B2) are respectively set on the bottom guide rails (B1); The lifting system (B3) includes four motors, each equipped with a slider. The sliders of the four motors are respectively set on two bottom guide rails (B1). Each motor has a gear on its output shaft. The entire outer wall of the four columns of the water-proof sleeve support frame (D) is equipped with racks. The gears of the four motors mesh with the racks of the four columns of the water-proof sleeve support frame (D). Among them, the two bottom guide rails (B1) work in conjunction with the sliders of the four motors of the lifting system (B3) to correct the positioning error of the water-proof sleeve support frame (D) on the deep-water self-elevating production platform. A limiting truss (B2) is used to restrict the movement or release of the water-proof sleeve support frame (D) away from the moon pool opening; The lifting system (B3) is used to lift or lower the riser sleeve support frame (D) to install the riser sleeve support frame (D) on the bottom foundation (C) or to separate the riser sleeve support frame (D) from the bottom foundation (C).

7. A method of using a waterproof sleeve support system that can be detached from the platform during a typhoon, comprising the waterproof sleeve support system described in claim 6, characterized in that... include: Installation of the riser sleeve support frame (D); After the installation of the riser support frame (D) is completed, in the absence of a typhoon, keep the bottom end of the riser fixedly connected to the subsea oil well and the top end connected to the inlet of the Christmas tree of the deepwater jack-up production platform. In the event of a typhoon requiring evacuation, the typhoon-resistant water-proof sleeve support frame (D) can be freed from the deep-water self-elevating production platform. After the typhoon, the deepwater jack-up production platform is towed back to its original operating position, and the installation steps of the riser support frame (D) are repeated to reconnect the riser support frame (D) with the moving mechanism (B) and the riser with the inlet of the deepwater jack-up production platform's wellhead; and Relocation of the riser sleeve support frame (D).

8. The method of using the waterproof sleeve support system that can be detached from the platform in the event of a typhoon, as described in claim 7, is characterized in that... The installation method of the water-proof sleeve support frame (D) includes: Installation of the water-proof sleeve support frame (D) on the bottom foundation (C): First, start the four motors of the lifting system (B3) and lower the water-proof sleeve support frame (D) close to the bottom foundation (C) until the water-proof sleeve support frame (D) and the bottom foundation (C) are aligned through the flared opening (C1); then, after the pin holes of the connecting piece (E1) of the bottom foundation (C) and the water-proof sleeve support frame (D) are aligned, the pin shaft (E2) is passed through the pin hole of the connecting piece (E1) of the bottom foundation (C) and the water-proof sleeve support frame (D) to complete the docking between the water-proof sleeve support frame (D) and the bottom foundation (C); finally, close the upper limit truss (B2) to restrict the water-proof sleeve support frame (D) from moving away from the moon pool hole, thus realizing the installation of the water-proof sleeve support frame (D) on the bottom foundation (C); Install riser casing: Lower the riser casing through the riser casing support frame (D) so that the bottom end of the riser casing is fixedly connected to the subsea oil well and the top end of the riser casing is connected to the inlet of the Christmas tree of the deepwater jack-up production platform.

9. The method of using the waterproof sleeve support system that can be detached from the platform in the event of a typhoon, as described in claim 8, is characterized in that... When evacuation is required due to a typhoon, the method for detaching the typhoon-prone water-proof sleeve support frame (D) from the deep-water self-elevating production platform includes: Open the limiting truss (B2); The deep-water self-elevating production platform was towed away from the typhoon-affected area by tugboats. The moon pool hole on the deck of the hull (A) was removed from the riser support frame (D), and the riser support frame (D) and the riser remained on the bottom foundation (C) to resist the typhoon. The mobile deep-water self-elevating production platform is separated from the riser support frame (D), so that the riser support frame (D) can be freed from the deep-water self-elevating production platform in the event of a typhoon. After the typhoon, the deep-water jack-up production platform was towed back to its original operating position using tugboats, allowing the riser support frame (D) to return to the moon pool opening and restoring the connection between the riser support frame (D) and the hull (A). This process included the following specific steps: Adjust the positions of the sliders of the four motors so that the gears of the four motors mesh with the racks of the four columns of the water-proof sleeve support frame (D); Lower the limiting truss (B2) so that both ends of the limiting truss (B2) are slidably mounted on the bottom guide rail (B1).

10. The method of using the waterproof sleeve support system that can be detached from the platform in the event of a typhoon, as described in claim 9, is characterized in that... When relocating a deep-water jack-up production platform, the relocation method for the riser support frame (D) includes: Cut the riser casing near the seabed mud surface and retrieve the riser casing; The riser support frame (D) is retrieved by the lifting system (B3) and includes the following specific steps: First, the pin (E2) is removed from the pin hole of the connecting piece (E1) between the bottom foundation (C) and the riser support frame (D); then, the four motors of the lifting system (B3) are started, and the gears on the output shafts of the four motors drive the four columns of the riser support frame (D) to move upward, thereby raising the riser support frame (D) away from the bottom foundation (C) until the riser support frame (D) is raised onto the deck of the hull (A); Use tugboats to tow away the deepwater jack-up production platform and move the deepwater jack-up production platform together with the riser support frame (D) until it is moved to the target oilfield location. Repeat the installation method of the water-proof sleeve support frame (D) to reinstall the water-proof sleeve support frame (D).

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