A FPSO remote replacement and emptying system and emptying method under typhoon mode

Abstract

The present invention relates to a FPSO remote replacement and emptying system in typhoon mode, comprising a crude oil processing system, a remote replacement system, and a nitrogen system; the crude oil processing system comprises a liquid inlet device, a heat exchanger, a separator assembly, a filter, a dehydration device, a gas processing device, a gas processing remote control valve assembly, a crude oil processing device, a crude oil processing remote control valve assembly, a production water treatment device, and a production water remote control valve assembly; the remote replacement system comprises a water supply device, an unqualified crude oil tank, a first remote control valve and a second remote control valve, and the nitrogen system comprises a nitrogen supply device and an intake remote control valve assembly. The present invention adopts multiple replacement processes and replacement medium redundancy settings to improve the reliability of switching and selecting remote control processes. In the absence of a power source, the valve can also be opened and closed using the pressure of a hydraulic accumulator.

Description

Technical Field

[0001] The present invention relates to the technical field of remotely controlled offshore oilfield production operations, and in particular to an FPSO remote replacement and emptying system and an emptying method under typhoon mode. Background Art

[0002] Offshore oil and gas fields in the South China Sea have long been plagued by typhoons. Even if the typhoon's center doesn't pass through the oilfields, each evacuation results in at least 72 hours of lost production. To address this issue, based on the automation and digitalization of offshore platforms, unmanned oilfield operations are now being implemented to delay production during typhoon-related extreme conditions. This approach effectively reduces typhoon-induced production losses.

[0003] Delayed shutdown in the unmanned oil field mode means that during the period from the time when personnel are evacuated (the facilities are unmanned) to the time when the typhoon shuts down, remote monitoring of various offshore production facilities is achieved on land, so as to achieve the purpose of real-time monitoring, remote operation and safe shutdown.

[0004] However, the high pour point of crude oil in some offshore oilfields makes replacement impossible after production is shut down, posing a risk of blockage. Furthermore, during typhoons, the sea is generally rough. Under remote control, the FPSO's swaying can be a primary trigger for production shutdowns. This can cause the separator's liquid level to fluctuate, compromising treatment efficiency and resulting in substandard product. Separator level fluctuations can also cause control valve failure, leading to high or low level shutdowns.

[0005] Therefore, there is an urgent need for a FPSO remote replacement and emptying system and emptying method under typhoon mode to prevent production safety accidents caused by the tank body shaking and swaying under typhoon mode. Summary of the Invention

[0006] One of the purposes of the present invention is to provide a remote replacement and emptying system for FPSO under typhoon mode, so as to solve the problem in the above-mentioned background technology that replacement cannot be carried out after remote shutdown, there is a risk of blockage, and the tank body is shaken and swung due to the typhoon, resulting in production safety accidents. Another purpose of the present invention is to provide a remote replacement and emptying method for FPSO under typhoon mode.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A FPSO remote displacement and emptying system in typhoon mode, comprising a crude oil processing system, a remote displacement system, and a nitrogen system;

[0009] The crude oil processing system includes a liquid inlet device, a heat exchanger, a separator assembly, a filter, a dehydration device, a gas processing device, a gas processing remote control valve assembly, a crude oil processing device, a crude oil processing remote control valve assembly, a produced water treatment device and a produced water remote control valve assembly;

[0010] The heat exchanger comprises a heat exchanger water-containing crude oil inlet, a heat exchanger water-containing crude oil outlet, a heat exchanger qualified crude oil inlet and a heat exchanger qualified crude oil outlet;

[0011] The separator assembly realizes three-phase separation of oil, gas and water, and the separator assembly includes a separator liquid inlet, a separator gas outlet, a separator oil outlet, a separator production water outlet and a separator gas inlet;

[0012] The dehydration device includes a dehydration liquid inlet, a dehydration liquid outlet and a dehydration production water outlet;

[0013] The water-containing crude oil inlet of the heat exchanger is connected to the liquid inlet device, the water-containing crude oil outlet of the heat exchanger is connected to the liquid inlet of the separator, the oil outlet of the separator is connected to the liquid inlet of the dehydration device, the filters are provided at both the water-containing crude oil inlet of the heat exchanger and the liquid inlet of the dehydration device, the gas outlet of the separator is connected to the gas processing device, the oil outlet of the separator is connected to the liquid inlet of the dehydration device, the liquid outlet of the dehydration device is connected to the oil inlet of the heat exchanger, the oil outlet of the heat exchanger is connected to the crude oil processing device, and the produced water outlet of the separator and the produced water outlet of the dehydration device are respectively connected to the produced water remote control valve assembly;

[0014] The crude oil processing remote control valve assembly is respectively provided between the dehydration liquid outlet and the qualified crude oil inlet of the heat exchanger, and between the qualified crude oil outlet of the heat exchanger and the crude oil processing device. The gas processing remote control valve assembly is provided between the separator gas outlet and the gas processing device. The produced water remote control valve assembly is provided on the pipeline connecting the oil outlet of the heat exchanger and the separator produced water outlet and the dehydration produced water outlet and the produced water remote control valve assembly.

[0015] The remote replacement system includes a water supply device, an unqualified crude oil tank, a first remote control valve, and a second remote control valve. The water supply device is connected to the water-containing crude oil inlet of the heat exchanger. The water supply device and the water-containing crude oil inlet of the heat exchanger are provided with the first remote control valve. The oil outlet of the heat exchanger is connected to the unqualified crude oil tank, and the oil inlet of the unqualified crude oil tank is provided with the second remote control valve.

[0016] The nitrogen system includes a nitrogen supply device and an air intake remote control valve assembly. The nitrogen supply device is connected to the separator air inlet, and the air intake remote control valve assembly is provided between the nitrogen supply device and the separator air inlet.

[0017] In the FPSO remote replacement and emptying system under typhoon mode, preferably, the separator assembly includes a primary separator and a secondary separator;

[0018] The first-stage separator includes a first-stage separator liquid inlet, a first-stage separator gas outlet, a first-stage separator oil outlet, a first-stage separator produced water outlet and a first-stage separator gas inlet;

[0019] The secondary separator includes a secondary separator heater, a secondary separator liquid inlet, a secondary separator gas outlet, a secondary separator oil outlet, a secondary separator produced water outlet and a secondary separator gas inlet;

[0020] The liquid inlet of the first-stage separator is connected to the outlet of the water-containing crude oil of the heat exchanger via the heater of the second-stage separator; the oil outlet of the first-stage separator is connected to the liquid inlet of the second-stage separator; the air inlet of the first-stage separator and the air inlet of the second-stage separator are respectively connected to the nitrogen gas supply device; the air outlet of the first-stage separator and the air outlet of the second-stage separator are respectively connected to the gas processing device; the produced water outlet of the first-stage separator and the produced water outlet of the second-stage separator are respectively connected to the produced water treatment device; the oil outlet of the second-stage separator is connected to the dehydration liquid inlet via the filter;

[0021] The air inlet remote control valve assembly is provided between the air inlet of the first-stage separator and the air inlet of the second-stage separator and the gas processing device, the gas processing remote control valve assembly is provided between the air outlet of the first-stage separator and the air outlet of the second-stage separator and the gas processing device, and the production water remote control valve assembly is provided between the production water outlet of the first-stage separator and the production water outlet of the second-stage separator and the production water treatment device.

[0022] The FPSO remote replacement and emptying system under typhoon mode, preferably, the dehydration device includes a booster pump and an electric dehydrator, the electric dehydrator is provided with the dehydration inlet, the dehydration outlet and the dehydration production water outlet, the oil outlet of the secondary separator, the filter, the booster pump and the dehydration inlet are connected in sequence, the dehydration outlet is connected to the qualified crude oil inlet of the heat exchanger, the crude oil processing remote control valve assembly is provided between the dehydration outlet and the qualified crude oil inlet of the heat exchanger, the dehydration production water outlet is connected to the production water treatment device, and the production water remote control valve assembly is provided between the dehydration production water outlet and the production water treatment device.

[0023] The FPSO remote replacement and emptying system in typhoon mode, preferably, the production water remote control valve assembly includes a third remote control valve, a fourth remote control valve and a fifth remote control valve, the third remote control valve is arranged at the production water outlet of the first-stage separator, the fourth remote control valve is arranged at the production water outlet of the second-stage separator, and the fifth remote control valve is arranged at the dehydrated production water outlet.

[0024] The FPSO remote replacement and emptying system in typhoon mode preferably comprises a crude oil processing device including a cargo oil tank device and a crude oil flash device, the cargo oil tank device is connected to the oil outlet of the heat exchanger via an oil inlet pipeline, the crude oil flash device is connected to the dehydration outlet, and the crude oil processing remote control valve assembly is provided on the oil inlet pipeline and at the dehydration outlet.

[0025] In the FPSO remote replacement and emptying system under typhoon mode, preferably, the cargo oil tank device includes a qualified crude oil cooler, a crude oil processing filter and a cargo oil tank, the oil inlet of the qualified crude oil cooler is connected to the oil outlet of the heat exchanger, and the crude oil processing remote control valve assembly is provided at the oil inlet of the qualified crude oil cooler, the oil outlet of the qualified crude oil cooler and the oil inlet of the cargo oil tank.

[0026] The FPSO remote replacement and emptying system in typhoon mode, preferably, the crude oil processing remote control valve assembly includes a sixth remote control valve, a seventh remote control valve, an eighth remote control valve, a ninth remote control valve and a tenth remote control valve, the sixth remote control valve is arranged at the dehydration outlet, the seventh remote control valve is arranged at the oil inlet of the qualified crude oil cooler, the eighth remote control valve is arranged at the oil outlet of the qualified crude oil cooler, the ninth remote control valve and the tenth remote control valve are arranged at the oil outlet of the crude oil processing filter, and the tenth remote control valve is arranged at the oil inlet of the cargo oil tank.

[0027] The FPSO remote replacement and emptying system under typhoon mode, preferably, the gas processing device includes a fuel gas processing and recovery system and a flare venting system, the first-level separator gas outlet is respectively connected to the fuel gas processing and recovery system and the flare venting system, the second-level separator gas outlet is connected to the flare venting system, the first-level separator gas outlet and the fuel gas processing and recovery system, the first-level separator gas outlet and the flare venting system, and the second-level separator gas outlet and the flare venting system are all provided with the gas processing remote control valve assembly.

[0028] The FPSO remote replacement and emptying system in typhoon mode, preferably, the gas processing remote control valve assembly includes an eleventh remote control valve, a twelfth remote control valve and a thirteenth remote control valve, the eleventh remote control valve is arranged between the first-level separator gas outlet and the fuel gas processing and recovery system, the twelfth remote control valve is arranged between the first-level separator gas outlet and the flare venting system, and the thirteenth remote control valve is arranged at the second-level separator gas outlet.

[0029] The FPSO remote replacement and emptying system in typhoon mode, preferably, the air inlet remote control valve assembly includes a fourteenth remote control valve and a fifteenth remote control valve, the fourteenth remote control valve is arranged between the outlet of the nitrogen supply device and the air inlet of the first-stage separator, and the fifteenth remote control valve is arranged between the outlet of the nitrogen supply device and the air inlet of the second-stage separator.

[0030] A method for remote replacement and emptying of an FPSO in a typhoon mode, comprising the FPSO remote replacement and emptying system in a typhoon mode, specifically comprising the following steps:

[0031] Discharging the crude oil in the crude oil processing system into the unqualified crude oil tank through the remote displacement system;

[0032] The produced water in the crude oil processing system is discharged into the produced water treatment device through the nitrogen system.

[0033] The present invention has the following advantages due to the adoption of the above technical solution:

[0034] 1. The present invention adopts multiple replacement processes and replacement medium redundancy settings to improve the reliability of switching and selection of remote control processes.

[0035] 2. The valves in the replacement process of the present invention include remotely operable hydraulic valves. In the absence of a power source, the valves can also be opened and closed by utilizing the pressure of the hydraulic accumulator.

[0036] 3. The present invention rationally utilizes the production water tank of the existing process system to complete the replacement work and uses the nitrogen system to promote the discharge.

[0037] 4. The present invention utilizes the pipelines where the third remote control valve, the fourth remote control valve and the fifth remote control valve are located downstream of the primary separator, the secondary separator and the electric dehydrator in the existing process flow, i.e., the bypass pipeline, and adds new remote control valves to realize the replacement of the pipelines of the upper device of the FPSO under power-off conditions, ensuring that even if the power source is lost, the basic replacement operation can still be completed based on the pressure of the hydraulic valve accumulator. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Schematic diagram of the system of the present invention.

[0039] In the picture:

[0040] 1. Nitrogen gas supply device; 2. Water supply device; 3. Liquid inlet device; 4. Ball receiving and sending cylinder; 5. Single point rotary joint;

[0041] 6. First remote control valve; 7. First filter; 8. Heat exchanger; 9. Third remote control valve;

[0042] 10. Fourteenth remote control valve; 11. Primary separator; 12. Remote control valve; 13. Eleventh remote control valve;

[0043] 14. Secondary separator heater; 15. Fifteenth remote control valve; 16. Fourth remote control valve;

[0044] 17. Secondary separator; 18. Second filter; 19. Booster pump; 20. Normally closed valve; 21. Sixth remote control valve;

[0045] 22. Electric dehydrator; 23. Fifth remote control valve; 24. Production water treatment device; 25. Crude oil flash distillation device;

[0046] 26. Fuel gas processing and recovery system; 27. Flare venting system; 28. Seventh remote control valve;

[0047] 29. Sixteenth remote control valve; 30. Qualified crude oil cooler; 31. Eighth remote control valve;

[0048] 32. Crude oil processing filter; 33. Ninth remote control valve; 34. Tenth remote control valve;

[0049] 35. Second remote control valve; 36. Incoming cargo tank; 37. Unqualified crude oil tank; 38. Thirteenth remote control valve;

[0050] 39. Twelfth remote control valve; 41. First control valve; 42. Second control valve. DETAILED DESCRIPTION

[0051] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0052] In the description of the present invention, it should be noted that the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh", "eighth", "ninth", "tenth", "eleventh", "twelfth", "thirteenth", "fourteenth", "fifteenth" and "sixteenth" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred system or element must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0053] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed" and "provided with" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0054] The present invention provides a FPSO remote displacement and emptying system in typhoon mode. The present invention comprises a crude oil processing system, a remote displacement system, and a nitrogen system;

[0055] The crude oil processing system includes a liquid inlet device, a heat exchanger, a separator assembly, a filter, a dehydration device, a gas processing device, a gas processing remote control valve assembly, a crude oil processing device, a crude oil processing remote control valve assembly, a produced water treatment device and a produced water remote control valve assembly;

[0056] The heat exchanger comprises a heat exchanger water-containing crude oil inlet, a heat exchanger water-containing crude oil outlet, a heat exchanger qualified crude oil inlet and a heat exchanger qualified crude oil outlet;

[0057] The separator assembly realizes three-phase separation of oil, gas and water, and the separator assembly includes a separator liquid inlet, a separator gas outlet, a separator oil outlet, a separator production water outlet and a separator gas inlet;

[0058] The dehydration device includes a dehydration liquid inlet, a dehydration liquid outlet and a dehydration production water outlet;

[0059] The water-containing crude oil inlet of the heat exchanger is connected to the liquid inlet device, the water-containing crude oil outlet of the heat exchanger is connected to the liquid inlet of the separator, the oil outlet of the separator is connected to the liquid inlet of the dehydration device, the filters are provided at both the water-containing crude oil inlet of the heat exchanger and the liquid inlet of the dehydration device, the gas outlet of the separator is connected to the gas processing device, the oil outlet of the separator is connected to the liquid inlet of the dehydration device, the liquid outlet of the dehydration device is connected to the oil inlet of the heat exchanger, the oil outlet of the heat exchanger is connected to the crude oil processing device, and the produced water outlet of the separator and the produced water outlet of the dehydration device are respectively connected to the produced water remote control valve assembly;

[0060] The crude oil processing remote control valve assembly is respectively provided between the dehydration liquid outlet and the qualified crude oil inlet of the heat exchanger, and between the qualified crude oil outlet of the heat exchanger and the crude oil processing device. The gas processing remote control valve assembly is provided between the separator gas outlet and the gas processing device. The produced water remote control valve assembly is provided on the pipeline connecting the oil outlet of the heat exchanger and the separator produced water outlet and the dehydration produced water outlet and the produced water remote control valve assembly.

[0061] The remote replacement system includes a water supply device, an unqualified crude oil tank, a first remote control valve, and a second remote control valve. The water supply device is connected to the water-containing crude oil inlet of the heat exchanger. The water supply device and the water-containing crude oil inlet of the heat exchanger are provided with the first remote control valve. The oil outlet of the heat exchanger is connected to the unqualified crude oil tank, and the oil inlet of the unqualified crude oil tank is provided with the second remote control valve.

[0062] The nitrogen system includes a nitrogen supply device and an air intake remote control valve assembly. The nitrogen supply device is connected to the separator air inlet, and the air intake remote control valve assembly is provided between the nitrogen supply device and the separator air inlet.

[0063] See Figure 1 As shown, a FPSO remote displacement and emptying system in typhoon mode includes a crude oil processing system, a remote displacement system and a nitrogen system;

[0064] The crude oil processing system includes a liquid inlet device 3, a heat exchanger 8, a separator assembly, a first filter 7, a second filter 18, a dehydration device, a gas processing device, a gas processing remote control valve assembly, a crude oil processing device, a crude oil processing remote control valve assembly, a production water treatment device and a production water remote control valve assembly; the fluid in the liquid inlet device 3 is introduced from the platform seabed pipeline.

[0065] The production water treatment device is a production water tank, which is equipped with a production water tank pump. The production water in the production water tank is sent to the downstream by a booster pump 19 to complete the replacement. The production water tank pump has a remote control start and stop function. At the same time, the hydraulic system is connected to emergency power to realize the remote control of the process system valve and the remote start and stop function of the booster pump 19 in front of the electric dehydrator.

[0066] The heat exchanger 8 includes a heat exchanger water-containing crude oil inlet, a heat exchanger water-containing crude oil outlet, a heat exchanger qualified crude oil inlet and a heat exchanger qualified crude oil outlet;

[0067] The separator assembly realizes three-phase separation of oil, gas and water, and the separator assembly includes a separator liquid inlet, a separator gas outlet, a separator oil outlet, a separator production water outlet and a separator gas inlet;

[0068] The dehydration device includes a dehydration liquid inlet, a dehydration liquid outlet and a dehydration production water outlet;

[0069] The water-containing crude oil inlet of the heat exchanger is connected to the liquid inlet device via a single-point rotary joint 5, the water-containing crude oil outlet of the heat exchanger is connected to the liquid inlet of the separator, and the oil outlet of the separator is connected to the liquid inlet of the dehydration device. A first filter 7 is provided at the water-containing crude oil inlet of the heat exchanger, and a second filter 18 is provided at the liquid inlet of the dehydration device. The gas outlet of the separator is connected to the gas processing device, the oil outlet of the separator is connected to the liquid inlet of the dehydration device, the liquid outlet of the dehydration device is connected to the oil inlet of the heat exchanger, and the oil outlet of the heat exchanger is connected to the crude oil processing device. The produced water outlet of the separator and the produced water outlet of the dehydration device are respectively connected to the produced water remote control valve assembly.

[0070] The crude oil processing remote control valve assembly is respectively provided between the dehydration liquid outlet and the qualified crude oil inlet of the heat exchanger, and between the qualified crude oil outlet of the heat exchanger and the crude oil processing device. The gas processing remote control valve assembly is provided between the separator gas outlet and the gas processing device. The produced water remote control valve assembly is provided on the pipeline connecting the oil outlet of the heat exchanger and the separator produced water outlet and the dehydration produced water outlet and the produced water remote control valve assembly.

[0071] The remote replacement system includes a water supply device 2, an unqualified crude oil tank 37, a first remote control valve 6, and a second remote control valve 35. The water supply device 2 is connected to the water-containing crude oil inlet of the heat exchanger. The water supply device 3 is provided with a first remote control valve 6 at the water-containing crude oil inlet of the heat exchanger. The oil outlet of the heat exchanger is connected to the unqualified crude oil tank 37, and the oil inlet of the unqualified crude oil tank 37 is provided with a second remote control valve 35.

[0072] The nitrogen system includes a nitrogen supply device 1 and an air inlet remote control valve assembly. The nitrogen supply device 1 is connected to the separator air inlet, and the air inlet remote control valve assembly is provided between the nitrogen supply device 1 and the separator air inlet. The nitrogen supply device 1 is a nitrogen storage tank.

[0073] The separator assembly includes a primary separator 11 and a secondary separator 17; the primary separator 11 includes a primary separator liquid inlet, a primary separator gas outlet, a primary separator oil outlet, a primary separator produced water outlet and a primary separator gas inlet;

[0074] The secondary separator 17 includes a secondary separator liquid inlet, a secondary separator gas outlet, a secondary separator oil outlet, a secondary separator produced water outlet and a secondary separator gas inlet;

[0075] The liquid inlet of the first-stage separator is connected to the water-containing crude oil outlet of the heat exchanger, the oil outlet of the first-stage separator is connected to the liquid inlet of the second-stage separator through the second-stage separator heater 14, the air inlet of the first-stage separator and the air inlet of the second-stage separator are respectively connected to the nitrogen gas supply device 1, the air outlet of the first-stage separator and the air outlet of the second-stage separator are respectively connected to the gas processing device, the produced water outlet of the first-stage separator and the produced water outlet of the second-stage separator are respectively connected to the produced water treatment device 24, and the oil outlet of the second-stage separator is connected to the dehydration liquid inlet through the second filter 18;

[0076] The air inlet remote control valve assembly is provided between the air inlet of the first-stage separator and the air inlet of the second-stage separator and the gas processing device, the gas processing remote control valve assembly is provided between the air outlet of the first-stage separator and the air outlet of the second-stage separator and the gas processing device, and the production water remote control valve assembly is provided between the production water outlet of the first-stage separator and the production water outlet of the second-stage separator and the production water treatment device 24.

[0077] In which, the dehydration device includes a booster pump 19 and an electric dehydrator 22, a normally closed valve 20 is provided between the electric dehydrator 22 and the second control valve 42, the electric dehydrator 22 is provided with the dehydration inlet, the dehydration outlet and the dehydrated production water outlet, the secondary separator oil outlet, the second filter 18, the booster pump 19 and the dehydration inlet are connected in sequence, the dehydration outlet is connected to the qualified crude oil inlet of the heat exchanger, the crude oil processing remote control valve assembly is provided between the dehydration outlet and the qualified crude oil inlet of the heat exchanger, the dehydrated production water outlet is connected to the production water treatment device 24, and the production water remote control valve assembly is provided between the dehydrated production water outlet and the production water treatment device 24.

[0078] Continue to refer to Figure 1As shown, the production water remote control valve assembly includes a third remote control valve 9, a fourth remote control valve 16 and a fifth remote control valve 23. The third remote control valve 9 is arranged at the production water outlet of the first-stage separator, the fourth remote control valve 16 is arranged at the production water outlet of the second-stage separator, and the fifth remote control valve 23 is arranged at the dehydrated production water outlet.

[0079] Continue to refer to Figure 1 As shown, the crude oil processing device includes a cargo oil tank device and a crude oil flash device 25. The cargo oil tank device is connected to the oil outlet of the heat exchanger through an oil inlet pipeline, and the crude oil flash device 25 is connected to the dehydration outlet. The crude oil processing remote control valve assembly is provided on the oil inlet pipeline and the dehydration outlet.

[0080] The cargo oil tank device includes a qualified crude oil cooler 30, a crude oil processing filter 32 and a cargo oil tank 36. The oil inlet of the qualified crude oil cooler 30 is connected to the oil outlet of the heat exchanger 8. The oil inlet of the qualified crude oil cooler 30, the oil outlet of the qualified crude oil cooler 30 and the oil inlet of the cargo oil tank 36 are all provided with the crude oil processing remote control valve assembly.

[0081] Continue to refer to Figure 1 As shown, the crude oil processing remote control valve assembly includes a sixth remote control valve 21, a seventh remote control valve 28, an eighth remote control valve 31, a ninth remote control valve and a tenth remote control valve 34. The sixth remote control valve 21 is arranged at the dehydration outlet, the seventh remote control valve 28 is arranged at the oil inlet of the qualified crude oil cooler 30, the eighth remote control valve 31 is arranged at the oil outlet of the qualified crude oil cooler 30, the ninth remote control valve 33 and the tenth remote control valve 34 are arranged at the oil outlet of the crude oil processing filter 32, and the tenth remote control valve 34 is arranged at the oil inlet of the cargo oil tank 36.

[0082] Continue to refer to Figure 1As shown, the oil inlet pipeline includes a first pipeline, a second pipeline and an oil outlet pipeline. The heat exchanger 8, the crude oil cooler 30 and the crude oil treatment filter 32 are connected through the first pipeline. The oil inlet of the crude oil cooler 30 is provided with a seventh remote control valve 28, and the oil outlet of the qualified crude oil cooler 30 is provided with an eighth remote control valve 31. A second pipeline is further provided between the heat exchanger 8 and the crude oil treatment filter 32. The oil inlet of the second pipeline is provided at the front end of the seventh remote control valve 28, and the oil outlet of the second pipeline is provided at the rear end of the eighth remote control valve 31. At the end, a sixteenth remote control valve 29 is provided on the second pipeline, the oil outlet of the first pipeline and the oil outlet of the second pipeline are connected through an oil outlet pipeline, and a crude oil treatment filter 32 and a ninth remote control valve 33 are provided on the oil outlet pipeline in sequence, and the end of the oil outlet pipeline is divided into branches, one of which is connected to the cargo oil tank 36, and the oil inlet of the cargo oil tank 36 is provided with a tenth remote control valve 34, and the other branch is connected to the unqualified crude oil tank 37, and the oil inlet of the unqualified crude oil tank 37 is provided with a second remote control valve 35.

[0083] Continue to refer to Figure 1 As shown, the gas processing device includes a fuel gas processing and recovery system 26 and a flare venting system 27, the first-level separator gas outlet is connected to the fuel gas processing and recovery system 26 and the flare venting system 27 respectively, the second-level separator gas outlet is connected to the flare venting system 27, the first-level separator gas outlet and the fuel gas processing and recovery system 26, the first-level separator gas outlet and the flare venting system 27 and the second-level separator gas outlet and the flare venting system 27 are all provided with the gas processing remote control valve assembly.

[0084] Continue to refer to Figure 1 As shown, the gas processing remote control valve assembly includes an eleventh remote control valve 13, a twelfth remote control valve 39 and a thirteenth remote control valve 38. The eleventh remote control valve 13 is arranged between the gas outlet of the first-level separator 11 and the fuel gas processing and recovery system 26, the twelfth remote control valve 39 is arranged between the gas outlet of the first-level separator 11 and the flare venting system 27, and the thirteenth remote control valve 38 is arranged at the gas outlet of the second-level separator 17.

[0085] Continue to refer to Figure 1 As shown, the air inlet remote control valve assembly includes a fourteenth remote control valve 10 and a fifteenth remote control valve 15. The fourteenth remote control valve 10 is arranged between the outlet of the nitrogen supply device 1 and the air inlet of the first-stage separator, and the fifteenth remote control valve 15 is arranged between the outlet of the nitrogen supply device 1 and the air inlet of the second-stage separator.

[0086] The butterfly valves on the left and right process tank inlets are electrically operated, enabling remote opening and closing to switch between produced water tanks. The ball valves for flotation waste oil to the left and right process tanks are electrically operated, enabling remote opening and closing to switch between produced oil tanks. The butterfly valves on the left and right process tank outlets are electrically operated, enabling remote opening and closing to prevent backflow into the left tank when processing produced water from the right tank, and vice versa.

[0087] The first remote control valve 6 , the fifth remote control valve 23 , the sixth remote control valve 21 , the eleventh remote control valve 13 , the twelfth remote control valve 39 , the thirteenth remote control valve 38 , the fourteenth remote control valve 10 and the fifteenth remote control valve 15 are all SDV valves.

[0088] The seventh remote control valve 28 , the sixteenth remote control valve 29 , the eighth remote control valve 31 , the ninth remote control valve 33 , the tenth remote control valve 34 and the second remote control valve 35 are all hydraulic valves.

[0089] The remote control valve 12 , the third remote control valve 9 and the fourth remote control valve 16 are all pneumatic valves.

[0090] The emptying method using the FPSO remote replacement emptying system in typhoon mode specifically includes:

[0091] Under normal process conditions, fluids from submarine pipelines on different platforms pass through the single-point rotary joint 5, through the heat exchanger's water-containing crude oil inlet, and after being filtered by the first filter 7, enter the heat exchanger 8 for heat exchange. The fluid then enters the primary separator 11 for three-phase separation into oil, gas, and water. The separated gas enters the fuel gas processing system 26 through the eleventh remote control valve 13. The primary separator 11 is equipped with a liquid level gauge to measure the liquid level therein. The first control valve 41 is opened and closed based on the measured value of the liquid level gauge. Specifically, when the liquid level in the primary separator 11 is too low, the first control valve 41 is closed. When the gas volume is low, it is discharged into the flare venting system 27 through the twelfth remote control valve 39. After treatment, the separated liquid phase enters the secondary separator heater 14, where it is heated to meet the inlet temperature of the secondary separator 17. It then enters the secondary separator 17 for further dehydration. The crude oil processed in the secondary separator 17 is first filtered by the second filter 18 and then, via the booster pump 19, enters the electric dehydrator 22 for further dehydration. The secondary separator 17 is provided with a liquid level gauge, which measures the liquid level and adjusts the opening and closing of the second control valve 42 according to the liquid level. That is, when the liquid level of the secondary separator 17 is too low, the second control valve 42 is opened.

[0092] After processing, the qualified crude oil enters the heat exchanger 8 through the qualified crude oil inlet of the heat exchanger. After initial cooling in the heat exchanger 8, it passes through the second pipeline and the seventh remote control valve 28 and enters the qualified crude oil cooler 30. After being cooled to 70°C in the crude oil cooler 30, it passes through the crude oil treatment filter 32 and is stored in the cargo oil tank 36. Some crude oil enters the crude oil flash unit 25 through the sixth remote control valve 21 for negative pressure flash evaporation to increase the flash point. After flash evaporation, the qualified crude oil enters the power plant's crude oil settling tank for sedimentation and is used by the crude oil generator. The amount entering the crude oil flash unit 25 is controlled by a flow meter. The gas from the secondary separator 17 enters the flare venting system 27. The produced water from the primary separator 11, the secondary separator 17, and the electric dehydrator 22 enters the produced water treatment unit 24 for treatment and discharge into the sea. During long-term production shutdowns, the oil-containing fluid in the process equipment must be replaced with the unqualified crude oil tank 37.

[0093] The replacement process in typhoon mode is consistent with the original design process, but to ensure remote control replacement, the SDV valve in the remote replacement process must meet remote reset requirements, and the manual valve must be converted to a remote control valve. The following takes the normal working conditions of the main generator as an example to explain the replacement and emptying process in typhoon mode:

[0094] In typhoon mode, personnel evacuate the platform and normal production operations are suspended to prevent the risk of high-viscosity oil products being stored in tanks for a long time, which may cause blockage and make it difficult to resume production. At this time, the first remote control valve 6 is remotely controlled to open, so that water from the sea pipe and the production water tank enters the tank of the first-stage separator 11 through the water supply device 2, gradually displacing the remaining oil in the tank of the first-stage separator 11. The displaced oil-containing fluid enters the tank of the second-stage separator 17, the booster pump 19 and the tank of the electric dehydrator 22 in turn, and the seventh remote control valve 28, the eighth remote control valve 31 and the tenth remote control valve 34 are remotely closed, and the sixteenth remote control valve 29, the ninth remote control valve 33 and the second remote control valve 35 are remotely opened, so that the oil-containing fluid finally enters the unqualified crude oil tank 37 along the production pipeline.

[0095] When the residual oil in the tank body is gradually replaced, the first remote control valve 6 and the sixth remote control valve 21 are remotely closed, and the fourteenth remote control valve 10 and the fifteenth remote control valve 15 of the nitrogen system are remotely opened, as well as the third remote control valve 9, the fourth remote control valve 16 and the fifth remote control valve 23 connecting the first-level separator 11, the second-level separator 17, the electric dehydrator 22 and the production water treatment device 24. The discharge of nitrogen causes the replacement fluid in the respective tank bodies of the first-level separator 11, the second-level separator 17 and the electric dehydrator 22 to be gradually discharged into the production water treatment device 24, so as to prevent the respective tank bodies of the first-level separator 11, the second-level separator 17 and the electric dehydrator 22 from shaking and swaying in typhoon mode, resulting in production safety accidents.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A FPSO remote replacement and emptying system in typhoon mode, characterized in that: Including crude oil processing system, remote displacement system and nitrogen system; The crude oil processing system includes a liquid inlet device, a heat exchanger, a separator assembly, a filter, a dehydration device, a gas processing device, a gas processing remote control valve assembly, a crude oil processing device, a crude oil processing remote control valve assembly, a produced water treatment device and a produced water remote control valve assembly; The heat exchanger comprises a heat exchanger water-containing crude oil inlet, a heat exchanger water-containing crude oil outlet, a heat exchanger qualified crude oil inlet and a heat exchanger qualified crude oil outlet; The separator assembly realizes three-phase separation of oil, gas and water, and the separator assembly includes a separator liquid inlet, a separator gas outlet, a separator oil outlet, a separator production water outlet and a separator gas inlet; The dehydration device includes a dehydration liquid inlet, a dehydration liquid outlet and a dehydration production water outlet; The water-containing crude oil inlet of the heat exchanger is connected to the liquid inlet device, the water-containing crude oil outlet of the heat exchanger is connected to the liquid inlet of the separator, the oil outlet of the separator is connected to the liquid inlet of the dehydration device, the filter is provided at both the water-containing crude oil inlet of the heat exchanger and the liquid inlet of the dehydration device, the gas outlet of the separator is connected to the gas processing device, the liquid outlet of the dehydration device is connected to the oil inlet of the heat exchanger, the oil outlet of the heat exchanger is connected to the crude oil processing device, and the produced water outlet of the separator and the produced water outlet of the dehydration device are respectively connected to the produced water remote control valve assembly; The crude oil processing remote control valve assembly is respectively provided between the dehydration liquid outlet and the qualified crude oil inlet of the heat exchanger, and between the qualified crude oil outlet of the heat exchanger and the crude oil processing device. The gas processing remote control valve assembly is provided between the separator gas outlet and the gas processing device. The produced water remote control valve assembly is provided on the pipeline connecting the oil outlet of the heat exchanger and the separator produced water outlet and the dehydration produced water outlet and the produced water remote control valve assembly. The remote replacement system includes a water supply device, an unqualified crude oil tank, a first remote control valve, and a second remote control valve. The water supply device is connected to the water-containing crude oil inlet of the heat exchanger. The water supply device and the water-containing crude oil inlet of the heat exchanger are provided with the first remote control valve. The oil outlet of the heat exchanger is connected to the unqualified crude oil tank, and the oil inlet of the unqualified crude oil tank is provided with the second remote control valve. The nitrogen system includes a nitrogen supply device and an air intake remote control valve assembly. The nitrogen supply device is connected to the separator air inlet, and the air intake remote control valve assembly is provided between the nitrogen supply device and the separator air inlet.

2. The FPSO remote replacement and emptying system under typhoon mode according to claim 1 is characterized in that: The separator assembly includes a primary separator and a secondary separator; The first-stage separator includes a first-stage separator liquid inlet, a first-stage separator gas outlet, a first-stage separator oil outlet, a first-stage separator produced water outlet and a first-stage separator gas inlet; The secondary separator includes a secondary separator heater, a secondary separator liquid inlet, a secondary separator gas outlet, a secondary separator oil outlet, a secondary separator produced water outlet and a secondary separator gas inlet; The liquid inlet of the first-stage separator is connected to the outlet of the water-containing crude oil of the heat exchanger, the oil outlet of the first-stage separator is connected to the liquid inlet of the second-stage separator via the second-stage separator heater, the air inlet of the first-stage separator and the air inlet of the second-stage separator are respectively connected to the nitrogen gas supply device, the air outlet of the first-stage separator and the air outlet of the second-stage separator are respectively connected to the gas processing device, the produced water outlet of the first-stage separator and the produced water outlet of the second-stage separator are respectively connected to the produced water treatment device, and the oil outlet of the second-stage separator is connected to the dehydration liquid inlet via the filter; The air inlet remote control valve assembly is provided between the air inlet of the first-stage separator and the air inlet of the second-stage separator and the gas processing device, the gas processing remote control valve assembly is provided between the air outlet of the first-stage separator and the air outlet of the second-stage separator and the gas processing device, and the production water remote control valve assembly is provided between the production water outlet of the first-stage separator and the production water outlet of the second-stage separator and the production water treatment device.

3. The FPSO remote replacement and emptying system under typhoon mode according to claim 2 is characterized in that: The dehydration device includes a booster pump and an electric dehydrator. The electric dehydrator is provided with the dehydration inlet, the dehydration outlet and the dehydrated production water outlet. The oil outlet of the secondary separator, the filter, the booster pump and the dehydration inlet are connected in sequence. The dehydration outlet is connected to the qualified crude oil inlet of the heat exchanger. The crude oil processing remote control valve assembly is provided between the dehydration outlet and the qualified crude oil inlet of the heat exchanger. The dehydrated production water outlet is connected to the production water treatment device. The production water remote control valve assembly is provided between the dehydrated production water outlet and the production water treatment device.

4. The FPSO remote replacement and emptying system under typhoon mode according to claim 3 is characterized in that: The production water remote control valve assembly includes a third remote control valve, a fourth remote control valve and a fifth remote control valve. The third remote control valve is arranged at the production water outlet of the first-stage separator, the fourth remote control valve is arranged at the production water outlet of the second-stage separator, and the fifth remote control valve is arranged at the dehydrated production water outlet.

5. The FPSO remote replacement and emptying system under typhoon mode according to claim 2 is characterized in that: The crude oil processing device includes a cargo oil tank device and a crude oil flash evaporation device. The cargo oil tank device is connected to the oil outlet of the heat exchanger through an oil inlet pipeline, and the crude oil flash evaporation device is connected to the dehydration outlet. The crude oil processing remote control valve assembly is provided on the oil inlet pipeline and at the dehydration outlet.

6. The FPSO remote replacement and emptying system in typhoon mode according to claim 5, characterized in that: The cargo oil tank device includes a qualified crude oil cooler, a crude oil processing filter and a cargo oil tank. The oil inlet of the qualified crude oil cooler is connected to the oil outlet of the heat exchanger. The oil inlet of the qualified crude oil cooler, the oil outlet of the qualified crude oil cooler and the oil inlet of the cargo oil tank are all provided with the crude oil processing remote control valve assembly.

7. The FPSO remote replacement and emptying system in typhoon mode according to claim 6, characterized in that: The crude oil processing remote control valve assembly includes a sixth remote control valve, a seventh remote control valve, an eighth remote control valve, a ninth remote control valve and a tenth remote control valve. The sixth remote control valve is arranged at the dehydration outlet, the seventh remote control valve is arranged at the oil inlet of the qualified crude oil cooler, the eighth remote control valve is arranged at the oil outlet of the qualified crude oil cooler, the ninth remote control valve and the tenth remote control valve are arranged at the oil outlet of the crude oil processing filter, and the tenth remote control valve is arranged at the oil inlet of the cargo oil tank.

8. The FPSO remote replacement and emptying system in typhoon mode according to claim 2, characterized in that: The gas processing device includes a fuel gas processing and recovery system and a flare venting system. The first-level separator gas outlet is connected to the fuel gas processing and recovery system and the flare venting system respectively, and the second-level separator gas outlet is connected to the flare venting system. The first-level separator gas outlet and the fuel gas processing and recovery system, the first-level separator gas outlet and the flare venting system, and the second-level separator gas outlet and the flare venting system are all provided with the gas processing remote control valve assembly.

9. The FPSO remote replacement and emptying system in typhoon mode according to claim 8, characterized in that: The gas processing remote control valve assembly includes an eleventh remote control valve, a twelfth remote control valve and a thirteenth remote control valve, the eleventh remote control valve is arranged between the gas outlet of the first-level separator and the fuel gas processing and recovery system, the twelfth remote control valve is arranged between the gas outlet of the first-level separator and the flare venting system, and the thirteenth remote control valve is arranged at the gas outlet of the second-level separator; The air inlet remote control valve assembly includes a fourteenth remote control valve and a fifteenth remote control valve. The fourteenth remote control valve is arranged between the outlet of the nitrogen supply device and the air inlet of the first-stage separator, and the fifteenth remote control valve is arranged between the outlet of the nitrogen supply device and the air inlet of the second-stage separator.

10. A method for remote displacement and emptying of FPSO in typhoon mode, characterized in that: The method comprises utilizing the FPSO remote replacement and emptying system in typhoon mode according to any one of claims 1 to 9, specifically comprising the following steps: Discharging the crude oil in the crude oil processing system into the unqualified crude oil tank through the remote displacement system; The produced water in the crude oil processing system is discharged into the produced water treatment device through the nitrogen system.

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