Recovery system for offshore oilfield associated gas

Abstract

The utility model provides a recovery system for associated gas of an offshore oilfield. A treatment platform of the recovery system is arranged on the sea surface in a floating manner; one end of the pipe gallery is detachably connected with the production platform, and the other end is connected with the processing platform; the pipe gallery can stretch out and draw back so as to keep being connected with the processing platform when the position of the processing platform moves. The gas conveying pipeline is arranged in the pipe gallery, one end of the gas conveying pipeline is detachably and flexibly connected and communicated with the production platform, the other end of the gas conveying pipeline is flexibly connected and communicated with the treatment platform, so that associated gas on the production platform can be conveyed to the treatment platform through the gas conveying pipeline, and the gas conveying pipeline can move along with the position of the treatment platform and keeps communicating with the treatment platform. The utilization rate of the recovery system is improved, the construction process of the associated gas recovery system is simplified, and the cost for recovering the associated gas of the offshore oilfield is reduced.

Description

Technical Field

[0001] This application relates to the technical field of offshore engineering recovery, and particularly relates to a recovery system for associated gas in offshore oilfields. Background Art

[0002] The associated gas in offshore oilfields has small or unstable production, and needs to be burned or vented through a flare, which not only causes waste of resources, but also causes certain pollution to the atmosphere. To reduce the combustion and venting volume of offshore associated gas and reduce carbon emissions, the recovery and utilization methods of offshore oilfield associated gas can generally be divided into: pipeline network recovery, oilfield reinjection, power generation and transmission, liquefaction recovery, compression recovery, etc. Different recovery and utilization methods can be selected according to conditions such as the geographical location of the offshore oilfield, formation conditions, production mode, pipeline network distribution, cable distribution, production volume, and remaining space of the production platform. Among them, only the liquefaction recovery and compression recovery methods have no engineering applications for the time being, but there are no technical difficulties and carbon emission risks in the engineering implementation of the liquefaction and compression recovery methods. The main constraints are the economic efficiency of the recovery plan and the oilfield production volume, etc.

[0003] The liquefaction or compression recovery plan for offshore associated gas is mainly based on offshore oilfields with large associated gas volumes. By building a floating or movable associated gas treatment platform beside the production platform, using a pipe gallery structure to transmit associated gas, cables, etc. from the production platform to the treatment platform, and using the liquefaction or compression treatment process system on the treatment platform to process the associated gas into a form that can be exported or transferred, thereby realizing the recovery and utilization of associated gas. Due to the unstable production of associated gas, the stable production period is usually 5 - 8 years. Therefore, the associated gas treatment platform should be designed to be movable or floating to improve the utilization rate of the associated gas treatment platform and can serve multiple production platforms during the service life of the platform. However, the traditional pipe gallery structure is fixed and cannot be easily removed once it is built and installed, which is not suitable for this operation mode of the associated gas treatment platform. Summary of the Utility Model

[0004] The purpose of the embodiments of this application is to provide a recovery system for associated gas in offshore oilfields to solve the problem that the pipe gallery of the traditional recovery system for associated gas in offshore oilfields cannot be reused.

[0005] The embodiments of this application adopt the following technical solutions: A recovery system for associated gas in offshore oilfields, the recovery system is applied to different associated gas production platforms in offshore oilfields, and includes:

[0006] A treatment platform, which is used to liquefy or compress the associated gas and output the liquefied or compressed associated gas; the treatment platform is floatingly arranged on the sea surface;

[0007] A pipe gallery, one end of which is detachably connected to the production platform and the other end is connected to the processing platform; the pipe gallery can be telescopic so that when the position of the processing platform moves, the pipe gallery can remain connected to the processing platform.

[0008] A gas transmission pipeline, which is arranged in the pipe gallery. One end of the gas transmission pipeline is detachably and flexibly connected and communicated with the production platform, and the other end of the gas transmission pipeline is flexibly connected and communicated with the processing platform, so that the associated gas on the production platform can be transported to the processing platform through the gas transmission pipeline, and the gas transmission pipeline can move with the position of the processing platform and remain communicated with the processing platform.

[0009] In some embodiments, the pipe gallery includes a telescopic pipeline and a shear detachment device.

[0010] One end of the telescopic pipeline is connected to one end of the shear detachment device, the other end of the shear detachment device is connected to the production platform, and when the shear force at the connection between the pipe gallery and the production platform is greater than the ultimate shear force of the shear detachment device, the shear detachment device disconnects from the production platform.

[0011] The other end of the telescopic pipeline is connected to the processing platform, or the other end of the telescopic pipeline is connected to the processing platform through a connecting pipe head.

[0012] In some embodiments, the shear detachment device includes a first structural member and a second structural member. One end of the first structural member is connected to the production platform, the other end of the first structural member is connected to one end of the second structural member, and the other end of the second structural member is connected to the telescopic pipeline. When the shear force at the connection between the first structural member and the second structural member is greater than the ultimate shear force of the shear detachment device, the second structural member detaches from the first structural member.

[0013] In some embodiments, the gas transmission pipeline includes a first telescopic hose, a second telescopic hose and a rigid pipe.

[0014] One end of the first telescopic hose is communicated with the gas outlet of the production platform, and the other end of the first telescopic hose is connected to one end of the rigid pipe; the other end of the rigid pipe is connected to one end of the second telescopic hose, and the other end of the second telescopic hose is communicated with the gas inlet of the processing platform.

[0015] In some embodiments, the first telescopic hose and / or the second telescopic hose includes a first part of the telescopic hose and a second part of the telescopic hose.

[0016] The gas transmission pipeline further includes an emergency detachment device.

[0017] The emergency disconnection device is arranged between the first telescopic hose part and the second telescopic hose part. When the locking mechanism of the emergency disconnection device is released, the first telescopic hose part is disconnected from the second telescopic hose part.

[0018] In some embodiments, the emergency disconnection device and the shear disconnection device are interlocked with each other. When the first telescopic hose part is disconnected from the second telescopic hose part, a signal is sent to the processor of the processing platform, and the processor sends a disconnection signal to the shear disconnection device to disconnect the shear disconnection device from the production platform; or,

[0019] When the shear disconnection device is disconnected from the production platform, a signal is sent to the processor, and the processor sends a disconnection signal to the emergency disconnection device to disconnect the first telescopic hose part from the second telescopic hose part.

[0020] In some embodiments, the emergency disconnection device further includes a first sealing valve, a first driving mechanism, a second sealing valve, and a second driving mechanism. The first sealing valve is connected to the first telescopic hose part, the second sealing valve is connected to the second telescopic hose part, the first sealing valve and the second sealing valve are connected by the locking mechanism. When the locking mechanism is released, the first driving mechanism drives the first sealing valve to close, and the second driving mechanism drives the second sealing valve to close.

[0021] In some embodiments, the first driving mechanism includes a first hydraulic motor and a first worm and worm gear reducer. The first hydraulic motor is connected to the first worm and worm gear reducer, and the first worm and worm gear reducer is connected to the first sealing valve. The first hydraulic motor drives the first worm and worm gear reducer to close or open the first sealing valve;

[0022] The second driving mechanism includes a second hydraulic motor and a second worm and worm gear reducer. The second hydraulic motor is connected to the second worm and worm gear reducer, and the second worm and worm gear reducer is connected to the second sealing valve. The second hydraulic motor drives the second worm and worm gear reducer to close or open the second sealing valve.

[0023] In some embodiments, the shear disconnection device includes a third hydraulic motor, and the third hydraulic motor is used to receive a disconnection signal from the processor and provide a force to disconnect the shear disconnection device from the production platform.

[0024] In some embodiments, the first telescopic hose and the second telescopic hose are metal bellows or composite material hoses, the rigid pipe is a steel pipe, and the inner wall of the gas transmission pipeline is provided with an anti-corrosion coating;

[0025] The processing platform is arranged at a distance of 20 meters to 40 meters from the production platform.

[0026] The beneficial effects of the embodiments of the present application are as follows:

[0027] By detachably arranging the pipe gallery on the production platform, arranging the gas transmission pipeline in the pipe gallery, and connecting the gas transmission pipeline to the production platform in a detachable manner, when the production platform needs to be replaced, both the pipe gallery and the gas transmission pipeline can be separated from the production platform together with the processing platform and then applied to another production platform, improving the utilization rate of the pipe gallery, the gas transmission pipeline and the processing platform, simplifying the construction process of the associated gas recovery system, and reducing the cost of associated gas recovery in offshore oilfields. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, the drawings in the following description are only some embodiments recorded in the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0029] Figure 1 It is a schematic structural diagram of the associated gas recovery system of the present application;

[0030] Figure 2 It is a schematic structural diagram of the pipe gallery, the gas transmission pipeline and the processing platform separated from the production platform of the present application;

[0031] Figure 3 It is a schematic structural diagram of the gas transmission pipeline of the present application;

[0032] Figure 4 It is a schematic structural diagram of the emergency disconnection device of the present application.

[0033] Reference numerals: 1, production platform; 2, processing platform; 201, support; 3, pipe gallery; 4, shear disconnection device; 5, gas transmission pipeline, 6, first telescopic hose; 601, first part of the telescopic hose; 602, second part of the telescopic hose; 7, second telescopic hose; 8, emergency disconnection device; 801, first sealing valve; 802, second sealing valve; 803, flange; 804, locking mechanism; 8041, hydraulic cylinder; 8042, locking rod; 805, first hydraulic motor; 806, first worm and worm gear reducer; 807, second worm and worm gear reducer; 9, hard pipe; 91, branch pipe; 10, sea surface. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] Reference is made herein to the various solutions and features of the present application with reference to the accompanying drawings.

[0035] It should be understood that various modifications can be made to the embodiments applied for herein. Therefore, the above specification should not be construed as limiting, but merely as exemplifications of the embodiments. Those skilled in the art will envision other modifications within the scope and spirit of the present application.

[0036] The accompanying drawings, which are included in and form a part of this specification, illustrate embodiments of the present application and, together with the general description of the present application given above and the detailed description of the embodiments given below, serve to explain the principles of the present application.

[0037] These and other features of the present application will become apparent from the following description of the preferred forms of the embodiments, given by way of non-limiting example, with reference to the accompanying drawings.

[0038] It should also be understood that although the present application has been described with reference to some specific examples, those skilled in the art can definitely implement many other equivalent forms of the present application.

[0039] When taken in conjunction with the accompanying drawings, the above and other aspects, features, and advantages of the present application will become more apparent in view of the following detailed description.

[0040] Specific embodiments of the present application will be described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments applied for are merely examples of the present application, which can be implemented in various ways. Well-known and / or repetitive functions and structures are not described in detail to avoid obscuring the present application with unnecessary or redundant details. Therefore, the specific structural and functional details applied for herein are not intended to be limiting, but merely as a basis and representative basis for the claims to teach those skilled in the art to use the present application in substantially any suitable detailed structure in a variety of ways.

[0041] This specification may use the phrases "in one embodiment", "in another embodiment", "in yet another embodiment", or "in other embodiments", each of which may refer to one or more of the same or different embodiments according to the present application.

[0042] The pipe gallery systems between existing platforms are all fixed, because usually the service times of two platforms are the same, and there is no need for a movable pipe gallery system. The movable associated gas recovery system proposed in this patent is based on an emerging offshore oil and gas engineering project - the recovery and utilization of associated gas in offshore oilfields. Combining two recovery methods of associated gas liquefaction and compression, and relying on the associated gas treatment platform, an innovative associated gas recovery system is proposed, the pipe gallery and the output pipeline of which can be moved to another production platform together with the treatment platform to recover the associated gas of another production platform.

[0043] That is, the present application provides a recovery system for associated gas in an offshore oilfield. The recovery system for associated gas is applied to different associated gas production platforms 1 in the offshore oilfield, that is, the recovery system for associated gas is movable and reusable. When the recovery of the associated gas from a production platform 1 is completed or when it is necessary to recover the associated gas from another production platform 1, the recovery system for associated gas can be quickly disassembled from the currently applied production platform 1, and the recovery system for associated gas can be transported to another production platform 1 where the associated gas is to be recovered by a towboat, and the recovery system for associated gas is installed on another production platform 1, so that the recovery system for associated gas can be quickly installed and disassembled and reused.

[0044] Combined with Figure 1 and Figure 2 , the recovery system for associated gas includes a processing platform 2, a pipe gallery 3 and a gas transmission pipeline 5.

[0045] A liquefaction or compression processing system is provided on the processing platform 2 for liquefying or compressing the associated gas and processing the liquefied or compressed associated gas into a form that can be exported or transferred, thereby realizing the recovery and utilization of the associated gas. The processing platform 2 can be floating or movable and is arranged on the sea surface. A support 201 can be provided at the bottom of the processing platform 2 to float the processing platform 2 above the sea surface 10 through the support 201. The processing platform 2 is located around the production platform 1 and can be arranged at a distance of 20 meters to 40 meters from the production platform 1. Of course, the distance interval between the processing platform 2 and the production platform 1 can be set according to the specific production situation. For example, the above distance interval is determined according to the environment of the sea area, etc.

[0046] The pipe gallery 3 has an installation space for accommodating the gas transmission pipeline 5. That is, the gas transmission pipeline 5 is arranged in the installation space of the pipe gallery 3 to protect the gas transmission channel through the pipe gallery 3 and prevent the gas transmission channel from being damaged and causing leakage of the associated gas, etc. In addition, the connection cables between the production platform 1 and the processing platform 2 can also be arranged in the installation space of the pipe gallery 3 to protect the cables, etc. One end of the pipe gallery 3 is detachably connected to the production platform 1, and the other end of the pipe gallery 3 is connected to the processing platform 2. The pipe gallery 3 can be telescopic, so that when the position of the processing platform 2 moves, the pipe gallery 3 can remain connected to the processing platform 2. The movable, telescopic and detachable pipe gallery 3 structure is used to adapt to the external load conditions of different target production platforms 1 and target oilfields, improve the installation efficiency and reduce the investment cost. The movable pipe gallery 3 structure can adjust the length and height of the pipe gallery 3 according to different external environments, and can withstand appropriate bending loads to adapt to the relative movement that may occur between the production platform 1 and the processing platform 2, and to adapt to the conditions of different target production platforms 1 and the target oilfield sea area.

[0047] After one end of the pipe gallery 3 is adjusted in height and length, it is connected to the pipe gallery 3 interface of the target production platform 1. During the operation and service of the processing platform 2, the pipe gallery 3 remains fixed between the production platform 1 and the processing platform 2.

[0048] The gas transmission pipeline 5 is arranged inside the pipe gallery 3. Specifically, the gas transmission pipeline 5 is installed in the installation space of the pipe gallery 3 so that the pipe gallery 3 can protect the gas transmission pipeline 5. One end of the gas transmission pipeline 5 is detachably and flexibly connected and communicated with the production platform 1, that is, one end of the gas transmission pipeline 5 is detachably connected to the associated gas outlet of the production platform 1, and the connection between the gas transmission pipeline 5 and the production platform 1 can be disconnected as needed. For example, when the target production platform 1 needs to be replaced, the gas transmission pipeline 5 can be disconnected from the gas outlet of the production platform 1. Moreover, one end of the gas transmission pipeline 5 is flexibly connected to the gas outlet of the production platform 1, and the other end of the gas transmission pipeline 5 is also flexibly connected and communicated with the intake port of the processing platform 2 so that when there are changes in distance or height between the production platform 1 and the processing platform 2, the gas transmission pipeline 5 can make adaptive adjustments to maintain the connection relationship between the gas transmission pipeline 5 and the production pipeline. For example, affected by the sea waves, the processing platform 2 located at sea may move with the waves, which requires the gas transmission pipeline 5 to maintain the connection and communication relationship with the production platform 1 and the processing platform 2 to prevent the leakage of associated gas.

[0049] The associated gas on the production platform 1 can be transported to the processing platform 2 through the gas transmission pipeline 5, and the associated gas is processed by the hydraulic or compression system on the processing platform 2.

[0050] In the case where both the pipe gallery 3 and the gas transmission pipeline 5 are disconnected from the production platform 1, the associated gas recovery system can be connected to another production platform 1 to recover the associated gas of the other production platform 1. That is, after the associated gas of the current production platform 1 is recovered, or when the production platform 1 needs to be replaced, the ends of the pipe gallery 3 and the gas transmission pipeline 5 connected to the production platform 1 can be disconnected respectively, so that the pipe gallery 3, the gas transmission pipeline 5 and the processing platform 2 can be towed to the target oilfield sea area by an engineering ship. This target oilfield sea area has a production platform 1, and this production platform 1 has associated gas to be recovered. Install the associated gas processing platform 2 at an appropriate safe distance (about 20m - 40m), and then connect it to the target production platform 1 through the movable pipe gallery 3 and the gas transmission pipeline 5, and the associated gas of the production platform 1 can be recovered through the processing platform 2.

[0051] In the embodiments of the present application, the pipe gallery 3 is detachably arranged on the production platform 1, the gas transmission pipeline 5 is arranged in the pipe gallery 3, and the gas transmission pipeline 5 is also connected to the production platform 1 in a detachable connection manner. When it is necessary to replace the production platform 1, both the pipe gallery 3 and the gas transmission pipeline 5 can be detached from the production platform 1 together with the processing platform 2 and then applied to another production platform 1, improving the utilization rate of the pipe gallery 3, the gas transmission pipeline 5 and the processing platform 2, simplifying the construction process of the associated gas recovery system, and reducing the cost of associated gas recovery in offshore oil fields.

[0052] In some embodiments, the pipe gallery 3 includes a telescopic pipeline and a shear detachment device 4.

[0053] One end of the telescopic pipeline is connected to one end of the shear detachment device 4, the other end of the shear detachment device 4 is connected to the interface on the production platform 1, and when the shear force at the connection between the pipe gallery 3 and the production platform 1 is greater than the ultimate shear force of the shear detachment device 4, the shear detachment device 4 disconnects from the production platform 1. The ultimate shear detachment device 4 can adopt an existing shear detachment device 4. When the shear detachment device 4 is subjected to the lateral shear force between the oil and gas production platform 1 and the movable recovery system, under the action of a small lateral shear force, the shear detachment device 4 can maintain the connection state and bear the interaction such as the tensile and compressive loads between the oil and gas production platform 1 and the movable pipe gallery 3. When the shear force reaches the shear force bearing limit of the shear detachment device 4, the shear detachment device 4 will undergo shear detachment to achieve the mechanical detachment of the oil and gas production platform 1 and the movable pipe gallery 3. Preventing a large shear force from damaging the movable associated gas recovery system or the oil and gas production platform 1.

[0054] The other end of the telescopic pipeline is connected to the connection port on the processing platform 2, or is connected to the connection port on the processing platform 2 through a connecting pipe head.

[0055] The pipe gallery 3 is located above the sea surface 10 to avoid the pipe gallery 3 being in contact with seawater for a long time, which affects the service life of the pipe gallery 3 and the gas transmission pipeline 5 inside the pipe gallery 3.

[0056] In some embodiments, the shear detachment device 4 includes a first structural member and a second structural member. One end of the first structural member is connected to the production platform 1, the other end of the first structural member is connected to one end of the second structural member, the other end of the second structural member is connected to the telescopic pipeline, and the first structural member and the second structural member are connected by a shear member. When the shear member is subjected to a shear force, it will break, that is, when the shear force at the connection between the first structural member and the second structural member is greater than the ultimate shear force of the shear detachment device 4, the shear member breaks and the second structural member detaches from the first structural member. The shear member can be but is not limited to a shear screw.

[0057] In some embodiments, the gas transmission pipeline 5 includes a first telescopic hose, a second telescopic hose 7 and a rigid pipe 9.

[0058] One end of the first telescopic hose is communicated with the air outlet of the production platform 1, and the other end of the first telescopic hose is connected to one end of the rigid pipe 9. The other end of the rigid pipe 9 is connected to one end of the second telescopic hose 7, and the other end of the second telescopic hose 7 is communicated with the air inlet of the processing platform 2. The gas transmission pipeline 5 is connected to the production platform 1 through the first telescopic hose and connected to the processing platform 2 through the second telescopic hose 7. The first telescopic hose and the second telescopic hose 7 are connected by the rigid pipe 9 to form a complete set of gas transmission pipeline 5 adapted to the structure of the pipe gallery 3.

[0059] The rigid pipe 9 can be a single long pipe or can be composed of a plurality of branch pipes 91 spliced and communicated with each other. The branch pipes 91 are detachably and hermetically connected to prevent the associated gas from leaking at the joints of the branch pipes 91. The connection between the branch pipes 91 can be but is not limited to the threaded connection method. Of course, other connection methods can also be used, and only this is used as an example, which does not constitute a limitation on the protection scope of the claims.

[0060] The first telescopic hose and the second telescopic hose 7 can be metal bellows or composite material hoses, and the rigid pipe 9 can be a steel pipe. Of course, it can be understood that the rigid pipe 9 can use other rigid pipes, and the corresponding materials can be specifically selected according to actual production. Since there are corrosive gases in the associated gas, anti-corrosion materials or coatings are required inside the gas transmission pipeline 5. The gas transmission pipeline 5 passes through the pipe gallery 3 to connect the associated gas pipeline of the production platform 1 and the associated gas pipeline of the processing platform 2, so as to transport the associated gas of the production platform 1 to the processing platform 2 for treatment to realize the recycling of the associated gas.

[0061] In some embodiments, in combination with Figure 3 , the first telescopic hose and / or the second telescopic hose 7 includes a first telescopic hose part 601 and a second telescopic hose part 602.

[0062] The gas transmission pipeline 5 further includes an emergency disconnection device 8. The emergency disconnection device 8 can be provided only at one end of the gas transmission pipeline 5 close to the production platform 1, or can be provided only at one end close to the processing platform 2, or the emergency disconnection device 8 can be provided at both ends of the gas transmission pipeline 5 close to the production platform 1 and the processing platform 2 respectively.

[0063] For example, the emergency detachment device 8 is arranged between the first telescopic hose part 601 and the second telescopic hose part 602, and the emergency detachment device 8 has a locking mechanism 804. When the locking mechanism 804 is released, the first telescopic hose part 601 and the second telescopic hose part 602 are disconnected. When a safety accident (such as a fire, etc.) occurs on any platform (production platform 1 or processing platform 2), the processor arranged on the production platform 1 or processing platform 2 can send a control signal to the emergency detachment device 8. After receiving the control signal, the emergency detachment device 8 can be quickly disconnected to quickly block possible safety accidents. Of course, the control signal can also be sent through a remote control system.

[0064] In some embodiments, the emergency detachment device 8 is interlocked with the shear detachment device 4 so that when the telescopic hose part 1 601 is disconnected from the telescopic hose part 2 602, a signal is sent to the processor or remote control system of the processing platform, and the processor sends a disconnection signal to the shear detachment device 4 to disconnect the shear detachment device 4 from the production platform 1.

[0065] Or, when the shearing and detaching device 4 is disconnected from the production platform 1, a signal is sent to the processor, and the processor sends a disconnection signal to the emergency detaching device 8, so that the telescopic hose part 1 601 is disconnected from the telescopic hose part 2 602. Specifically, the shearing and detaching device 4 may be built with an optical fiber and a displacement sensor. When the shearing and detaching device 4 is disconnected, the two signals are cut off at the same time. The processor can learn that the above signals are cut off, and sends a disconnection signal to the emergency detaching device 8, so that the emergency detaching device 8 is disconnected in conjunction with the disconnection of the shearing and detaching device 4.

[0066] When any platform (production platform 1 or processing platform 2) overturns and the shear force at the connection between the pipe gallery 3 and the production platform 1 is greater than the limit shear force of the detachment device, the shear detachment device 4 will disconnect the connection between the pipe gallery 3 and the production platform 1, and at the same time trigger the emergency detachment device 8 in the gas pipeline 5 to disconnect the gas supply between the production platform 1 and the processing platform 2 to prevent more serious safety accidents.

[0067] In some embodiments, in combination Figure 4The emergency release device 8 also includes a first sealing valve 801, a first driving mechanism, a second sealing valve 802 and a second driving mechanism. The first driving mechanism is connected to the first sealing valve 801, the second driving mechanism is connected to the second sealing valve 802, the first sealing valve 801 is connected to the first part of the telescopic hose 601, the second sealing valve 802 is connected to the second part of the telescopic hose 602, and the first sealing valve 801 and the second sealing valve 802 are connected through a locking mechanism 804. Specifically, the first sealing valve 801 and the second sealing valve 802 are connected through a flange 803, and a locking mechanism 804 is arranged on the outer edge of the flange 803. The locking mechanism 804 may include a clamp, a hydraulic cylinder 8041 and a locking rod 8042, and the first sealing valve 801 and the second sealing valve 802 are clamped by the clamp. When the locking mechanism 804 is released, the hydraulic cylinder 8041 of the locking mechanism 804 can push the locking rod 8042 connected to the hydraulic cylinder 8041 to realize the emergency opening of the locking mechanism 804. The first driving mechanism drives the first sealing valve 801 to close to block the first part of the telescopic hose 601, thereby preventing the associated gas from leaking from the first part of the telescopic hose 601 and causing a safety accident; similarly, the second driving mechanism drives the second sealing valve 802 to close to block the second part of the telescopic hose 602, thereby preventing the associated gas from leaking from the second part of the telescopic hose 602 and causing a safety accident.

[0068] The first sealing valve 801 and the second sealing valve 802 can be, but are not limited to, ball valves.

[0069] That is, the embodiment of the present application utilizes a combination of soft and hard gas pipelines 5 to adapt to the large curvature connection and sea conditions of the pipeline corridor 3 to the production platform 1 and the processing platform 2. At the same time, if a fire or other safety accident occurs on any platform, the gas pipeline 5 can be disconnected through the emergency release device 8 to ensure sea condition adaptability and operational safety.

[0070] In some embodiments, the Figure 4 The first driving mechanism includes a first hydraulic motor 805 and a first worm gear reducer 806. The first hydraulic motor 805 is connected to the first worm gear reducer 806. The first worm gear reducer 806 is connected to the first sealing valve 801. The first hydraulic motor 805 drives the first worm gear reducer to close or open the first sealing valve 801.

[0071] The second hydraulic motor (not shown in the figure) is connected to the second worm gear reducer 807 , and the second worm gear reducer 807 is connected to the second sealing valve 802 . The second hydraulic motor drives the second worm gear reducer to close or open the second sealing valve 802 .

[0072] The first hydraulic motor 805 and the second hydraulic motor can simultaneously receive corresponding control signals to start or stop the first hydraulic motor 805 and the second hydraulic motor at the same time, so as to simultaneously block the first telescopic hose part 601 and the second telescopic hose part 602, and minimize the leakage of associated gas.

[0073] In some embodiments, the shearing and detaching device 4 includes a third hydraulic motor, which is used to receive a disconnection signal from a processor or a remote control system and provide a force to disconnect the shearing and detaching device 4 from the production platform 1. The third hydraulic motor can be arranged on the second structural member and connected to the corresponding thrust rod to apply a force to the first structural member, so that the pulling device between the first structural member and the second structural member can be disconnected.

[0074] After the service life of the processing platform 2 ends, the pipe gallery 3 is detached from the target production platform 1, and the pipe gallery 3 is recovered to the processing platform 2 by its telescopic and height-adjustable characteristics. At the same time, the gas transmission pipeline 5 is recovered, and the remaining life of the gas transmission pipeline 5 is evaluated. If the gas transmission pipeline 5 can continue to be used, the movable pipe gallery 3 and the gas transmission pipeline 5 can go to the next target production platform 1 together with the processing platform 2 to continue to serve the recovery and utilization of associated gas for offshore oilfields, providing technical support for energy conservation and carbon reduction in offshore oil and gas projects.

[0075] The above has described multiple embodiments of the present application in detail, but the present application is not limited to these specific embodiments. Based on the concept of the present application, those skilled in the art can make various variations and modifications to the embodiments, and these variations and modifications should fall within the scope of protection required by the present application.

Claims

1. A system for recovering associated gas from an offshore oil field, characterized in that: The recovery system is applied to different associated gas production platforms in offshore oil fields, including: A processing platform, which is used to liquefy or compress the associated gas and output the liquefied or compressed associated gas; the processing platform is floated on the sea surface; a pipe gallery, one end of which is detachably connected to the production platform and the other end of which is connected to the processing platform; the pipe gallery is retractable so that when the position of the processing platform moves, the pipe gallery can remain connected to the processing platform; A gas pipeline is arranged in the pipeline gallery, one end of the gas pipeline is detachably and flexibly connected to and communicated with the production platform, and the other end of the gas pipeline is flexibly connected to and communicated with the processing platform, so that the associated gas on the production platform can be transported to the processing platform through the gas pipeline, and the gas pipeline can move with the position of the processing platform and remain connected to the processing platform.

2. The offshore oilfield associated gas recovery system according to claim 1, characterized in that: The pipe gallery includes a telescopic pipe and a shearing and disengaging device; One end of the telescopic pipe is connected to one end of the shear detachment device, and the other end of the shear detachment device is connected to the production platform. When the shear force at the connection between the pipe gallery and the production platform is greater than the limit shear force of the shear detachment device, the shear detachment device is disconnected from the production platform; The other end of the telescopic pipe is connected to the processing platform, or the other end of the telescopic pipe is connected to the processing platform through a connecting pipe head.

3. The offshore oilfield associated gas recovery system according to claim 2, characterized in that: The shear detachment device includes a first structural member and a second structural member, one end of the first structural member is connected to the production platform, the other end of the first structural member is connected to one end of the second structural member, and the other end of the second structural member is connected to the telescopic pipe. When the shear force at the connection between the first structural member and the second structural member is greater than the limit shear force of the shear detachment device, the second structural member detaches from the first structural member.

4. The offshore oilfield associated gas recovery system according to claim 2, characterized in that: The gas pipeline comprises a first telescopic hose, a second telescopic hose and a hard pipe; One end of the first telescopic hose is connected to the air outlet of the production platform, and the other end of the first telescopic hose is connected to one end of the hard pipe; the other end of the hard pipe is connected to one end of the second telescopic hose, and the other end of the second telescopic hose is connected to the air inlet of the processing platform.

5. The offshore oilfield associated gas recovery system according to claim 4, characterized in that: The first telescopic hose and / or the second telescopic hose comprises a first telescopic hose part and a second telescopic hose part; The gas pipeline also includes an emergency release device; The emergency detachment device is arranged between the first telescopic hose portion and the second telescopic hose portion. When the locking mechanism of the emergency detachment device is released, the first telescopic hose portion is disconnected from the second telescopic hose portion.

6. The offshore oilfield associated gas recovery system according to claim 5, characterized in that: The emergency detachment device is interlocked with the shear detachment device so that when the first part of the telescopic hose is disconnected from the second part of the telescopic hose, a signal is sent to the processor of the processing platform, and the processor sends a disconnection signal to the shear detachment device so that the shear detachment device is disconnected from the production platform; or, When the shearing and detaching device is disconnected from the production platform, a signal is sent to the processor, and the processor sends a disconnection signal to the emergency detaching device to disconnect the first part of the telescopic hose from the second part of the telescopic hose.

7. The offshore oilfield associated gas recovery system according to claim 5, characterized in that: The emergency release device also includes a first sealing valve, a first driving mechanism, a second sealing valve and a second driving mechanism. The first sealing valve is connected to the first part of the telescopic hose, and the second sealing valve is connected to the second part of the telescopic hose. The first sealing valve and the second sealing valve are connected through the locking mechanism. When the locking mechanism is released, the first driving mechanism drives the first sealing valve to close, and the second driving mechanism drives the second sealing valve to close.

8. The offshore oilfield associated gas recovery system according to claim 7, characterized in that: The first driving mechanism includes a first hydraulic motor and a first worm gear reducer, the first hydraulic motor is connected to the first worm gear reducer, the first worm gear reducer is connected to the first sealing valve, and the first hydraulic motor drives the first worm gear reducer to close or open the first sealing valve; The second driving mechanism includes a second hydraulic motor and a second worm gear reducer, the second hydraulic motor is connected to the second worm gear reducer, the second worm gear reducer is connected to the second sealing valve, and the second hydraulic motor drives the second worm gear reducer to close or open the second sealing valve.

9. The offshore oilfield associated gas recovery system according to claim 6, characterized in that: The shear detachment device comprises a third hydraulic motor, and the third hydraulic motor is used to receive a disconnection signal from the processor and provide a force to disconnect the shear detachment device from the production platform.

10. The offshore oilfield associated gas recovery system according to claim 4, characterized in that: The first telescopic hose and the second telescopic hose are metal bellows or composite hoses, the hard pipe is a steel pipe, and the inner wall of the gas pipeline is provided with an anti-corrosion coating; The processing platform is arranged 20 to 40 meters away from the production platform.

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