Production module for a floating production, storage and offloading unit

Abstract

The application discloses a production module of a floating production storage and offloading device and belongs to the technical field of FPSO, which comprises a production water treatment module, wherein the production water treatment module comprises a hydrocyclone separator, a compact air floatation unit, a pressure reduction pipeline and a degassing tank; production water in a sewage tank of the FPSO enters the hydrocyclone separator; the hydrocyclone separator is used for separating oil and water by utilizing the density difference between the oil and the water; the production water after the cyclone separation flows into the compact air floatation unit through the pipeline; and the compact air floatation unit is used for rapidly floating oil droplets in the production water by utilizing bubbles. The FPSO production module of the application carries out oil removal treatment on the production water separated in the crude oil treatment process, so that the oil content of the production water is reduced to within 15 ppm, and therefore, in a long-term oil exploitation process, the discharged production water does not cause pollution to seawater. The gas treatment module in the application is additionally provided with a liquid level regulating device, the liquid level in a glycol tower is controlled to ensure that there is always liquid in the glycol tower, and high-pressure gas in the glycol tower is prevented from leaking into a flash regeneration tower, so that the flash regeneration tower is prevented from causing fire and explosion.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of floating production storage and offloading device, in particular to a production module of floating production storage and offloading device. BACKGROUND

[0002] FPSO (Floating Production Storage & Offloading) is a common carrier and mode of deepwater oil and gas development, usually including two forms of ship type and cylinder type. FPSO is a comprehensive large-scale offshore oil production base which integrates personnel residence and production command system, and is used for oil and gas separation, treatment of oily water, power generation, heat supply, storage and transportation of oil products. FPSO is usually combined with a drilling platform or a subsea production system to form a complete oil production, oil treatment, storage and unloading system. The operating principle of FPSO is as follows: receiving the produced oil from the subsea well through the subsea pipeline, treating the oil on the ship, then storing the oil in the cargo oil tank, and finally transporting the oil to the shuttle tanker through the unloading system.

[0003] The production water separated from FPSO in the actual oil treatment process is generally discharged into the sea. Since the production water contains a certain amount of oil, although the oil content in the production water is very small, the accumulated discharge into the sea will cause a certain pollution to the seawater. Therefore, the treatment of the production water is also a problem to be solved at present.

[0004] In addition, the natural gas separated from FPSO in the actual oil treatment process will cause fire and even explosion if not handled properly, which seriously threatens the personal safety of the workers on the floating body. Therefore, how to improve the safety of natural gas treatment and ensure the personal safety of the workers on the floating body is a problem to be solved at present. SUMMARY

[0005] In order to overcome the above-mentioned deficiencies, the purpose of the present application is to provide a production module of floating production storage and offloading device which does not pollute seawater and is safe and reliable in operation.

[0006] To solve the above technical problems, the technical scheme adopted by the present application is:

[0007] A production module of a floating production storage and offloading unit, comprising a production water treatment module, the production water treatment module comprising a hydrocyclone, a compact air floatation unit, a pressure reduction pipeline and a degassing tank, production water in a FPSO sewage tank enters the hydrocyclone, the hydrocyclone is used to separate oil and water by utilizing the density difference between oil and water, the production water after cyclone separation flows into the compact air floatation unit through a pipeline, the compact air floatation unit is used to float oil droplets in the production water quickly by utilizing bubbles; when the production water flows into the compact air floatation unit, fuel gas is introduced into the compact air floatation unit, so that the pressure in the compact air floatation unit increases, the fuel gas forms bubbles in the water in the compact air floatation unit, the oil in the water is adsorbed by the surface tension of the bubbles and floated, the production water saturated by the fuel gas adsorption is sent into the degassing tank through the pressure reduction pipeline after pressure reduction, the production water after pressure reduction further forms small bubbles, carries oil droplets and floats to the liquid level of the production water in the degassing tank, the oil droplets on the surface of the production water enter the oil tank through the V-shaped overflow port at the upper part of the degassing tank, the oil in the oil tank is sent to a crude oil treatment module by a skimming pump, and the production water discharged from the degassing tank with a reduced oil content of 15 ppm is discharged into the sea through a drainage pipeline.

[0008] Further, an online oil-water analyzer is arranged in the drainage pipeline, if the oil content in the water exceeds the standard, the water is returned to the FPSO sewage tank for oil removal treatment again to ensure that no sewage is discharged.

[0009] Further, the production module of the floating production storage and offloading unit further comprises a water injection module, the water injection module is used to inject water to the wellhead of a sea oil well to maintain the pressure and productivity of the wellhead of the oil well; the water injection module comprises three ultra-fine filters and a deoxygenation tower, seawater is filtered through the three ultra-fine filters and then sent into the deoxygenation tower to obtain water with a solid particle size of less than 20 microns and an oxygen content of less than 5 ppbv.

[0010] Further, the ultra-fine filter is provided with a hard coal filter layer, a coarse garnet filter layer and a fine garnet filter layer; the deoxygenation tower comprises a first-stage negative pressure filler tower and a second-stage negative pressure filler tower connected in series, the vacuum degree of the first-stage negative pressure filler tower is greater than that of the second-stage negative pressure filler tower, so as to reduce the power consumption of the vacuum pump of the second-stage negative pressure filler tower.

[0011] Further, the crude oil processing module comprises a feed heater, a first-stage gas-liquid separator, an inter-stage heater, a second-stage gas-liquid separator, a sand filter, an electric dehydration processor, a cargo oil cooler and a cargo oil pump, crude oil delivered from a sea oil well is heated by the feed heater and then sequentially sent into the first-stage gas-liquid separator, the inter-stage heater and the second-stage gas-liquid separator for gas-liquid separation; the oil liquid after the gas-liquid separation is sent into the sand filter, which is used to remove sand particles in the oil liquid, the oil liquid after the sand particles are removed is sent into the electric dehydration processor for oil liquid dehydration treatment, and then cooled by the cargo oil cooler, and the oil is sent into a cargo oil tank by the cargo oil pump; the electric dehydration processor generates an electrostatic field by using a single-phase high-voltage power supply to remove water emulsified in the oil by electric aggregation, so that the water content in the oil meets the index BS&W <0.5%; the natural gas after the gas-liquid separation is sent into a natural gas processing module for treatment; and production water obtained by the crude oil processing module is delivered to an FPSO sewage tank.

[0012] Further, the natural gas processing module comprises a low-pressure compressor, a glycol tower, a flash regeneration tower, a mercury removal device, a high-pressure compressor and a natural gas storage bin, the gas after the gas-liquid separation is compressed by the low-pressure compressor and then sent into the glycol tower, the glycol tower is used to absorb saturated water in the natural gas, the water-adsorbed glycol is distilled by the flash regeneration tower to separate the water from the glycol, so as to recycle the glycol, the dehydrated natural gas is sent into the mercury removal device for mercury removal treatment, and the natural gas after the mercury removal treatment is pressurized to 140 barg by the high-pressure compressor and then sent into the natural gas storage bin.

[0013] Further, the glycol tower is provided with a liquid level control device, the liquid level control device comprises a controller, an upper limit liquid level sensor, a lower limit liquid level sensor and a flow regulating electromagnetic valve, the flow regulating electromagnetic valve is arranged on an output pipeline of the water-adsorbed glycol between the glycol tower and the flash regeneration tower; when the liquid level in the glycol tower reaches the lower limit liquid level position, the lower limit liquid level sensor transmits information to the controller, and the controller reduces the flow of the flow regulating electromagnetic valve; when the liquid level in the glycol tower reaches the upper limit liquid level position, the upper limit liquid level sensor transmits information to the controller, and the controller increases the flow of the flow regulating electromagnetic valve. The liquid level in the glycol tower is controlled to ensure that there is always liquid in the glycol tower, so as to prevent high-pressure gas in the glycol tower from leaking into the flash regeneration tower, which causes a fire or explosion in the flash regeneration tower. In order to reduce the possibility of accidents and the severity of consequences, the liquid level control device is additionally arranged.

[0014] Further, the mercury removal device adopts a chemical adsorbent mercury removal structure mode, and the mercury removal adsorbent in the mercury removal device does not need to be regenerated, and exists in the form of inorganic sulfide to remove elemental mercury and organic mercury in the natural gas. The mercury has high volatility, high toxicity and strong corrosiveness, and the mercury content in the natural gas is required to be less than 0.1 ppb according to the application. The mercury in the natural gas mainly exists in the form of elemental mercury. The chemical adsorption mercury removal process in the application is superior to other mercury removal processes in economy, mercury removal effect and environmental protection. The selection of the mercury removal adsorbent is a key part of the chemical adsorption process, and the mercury removal adsorbent is divided into a carrier and a reactant, and the reactant is the main substance for mercury removal and is uniformly distributed in the porous carrier. The natural gas mercury removal agent mainly includes sulfur / silver loaded activated carbon, silver loaded molecular sieve and other special mercury removal agents. The sulfur / silver loaded activated carbon and the silver loaded molecular sieve are adsorbents that need to be regenerated, and the process flow is relatively complex, and the investment and the occupied deck area are large. The application selects a special mercury removal agent which does not need to be regenerated. The service life can reach 5 years, and the mercury removal adsorbent can be sent to the factory for recovery after being used for 5 years. The process technology is advanced and economical.

[0015] Further, the production module of the FPSO further comprises a gas recovery device, the gas recovery device is used to recover the gas discharged by the cargo oil tank breathing, and the gas recovery device comprises a gas scrubber, a heat exchanger and a screw compressor.

[0016] Further, the production module of the FPSO further comprises a flare system, the flare system comprises a high-pressure flare buffer tank, a low-pressure flare buffer tank, a flare and a mechanical bullet igniter, when the gas discharged by the cargo oil tank breathing and the production tail gas are more, the gas recovery device cannot process in time, the gas is sent into the high-pressure flare buffer tank, the gas in the high-pressure flare buffer tank is sent into the flare through the low-pressure flare buffer tank, and the mechanical bullet igniter is used to ignite the flare.

[0017] Beneficial effects

[0018] The FPSO production module of the application carries out oil removal treatment on the production water separated in the crude oil treatment process, so that the oil content of the production water is reduced to within 15 ppm, and therefore in the long-term oil exploitation process, the discharged production water will not cause pollution to seawater.

[0019] The gas treatment module in the application is additionally provided with a liquid level regulation device, the liquid level in the glycol tower is controlled to ensure that there is always liquid in the glycol tower, and the high-pressure gas in the glycol tower is prevented from leaking into the flash regeneration tower, so that the flash regeneration tower is prevented from causing fire and explosion. BRIEF DESCRIPTION OF DRAWINGS

[0020] The application is further illustrated by the accompanying drawings, but the embodiments in the drawings do not constitute any limitation to the application, and other embodiments can be obtained by those skilled in the art without creative effort on the basis of the following drawings:

[0021] Figure 1 Structure diagram of the production module of the application;

[0022] Figure 2 Structure diagram of the production water treatment module shown in Figure 1

[0023] Structure diagram of the crude oil treatment module shown in Figure 3 Figure 1 Structure diagram of the natural gas treatment module shown in

[0024] Figure 4 Figure 1 Structure diagram of the natural gas treatment module shown in

[0025] In the drawings: 1, production water treatment module; 2, water injection module; 3, crude oil treatment module; 4, natural gas treatment module; 5, gas recovery device; 6, flare system; 7, offshore oil well; 8, cargo oil tank; 9, FPSO sewage tank; 10, natural gas storage bin; 11, flare; 12, mechanical bullet igniter; 13, high-pressure flare buffer tank; 14, low-pressure flare buffer tank; 15, hydrocyclone; 16, compact air floatation unit; 17, pressure reduction pipeline; 18, degassing tank; 19, V-shaped overflow; 20, oil tank; 21, oil skimming pump; 22, drainage pipeline; 23, online oil-water analyzer; 24, gas inlet pipeline; 25, superfine filter; 26, primary negative pressure packed tower; 27, secondary negative pressure packed tower; 28, hard coal filter layer; 29, coarse garnet filter layer; 30, fine garnet filter layer; 31, feed heater; 32, primary gas-liquid separator; 33, inter-stage heater; 34, secondary gas-liquid separator; 35, sand filter; 36, electric dehydration processor; 37, cargo oil cooler; 38, cargo oil pump; 39, natural gas delivery pipeline; 40, low-pressure compressor; 41, glycol tower; 42, flash regeneration tower; 43, mercury removal device; 44, high-pressure compressor; 45, controller; 46, upper limit liquid level sensor; 47, lower limit liquid level sensor; 48, flow regulating solenoid valve; 49, adsorbed water glycol output pipeline; 50, gas scrubber; 51, heat exchanger; 52, screw compressor. DETAILED DESCRIPTION

[0026] In order for those skilled in the art to better understand the technical solutions of the application, the application is further described in detail below in combination with the drawings and specific embodiments, and it should be noted that the embodiments of the application and the features in the embodiments can be combined with each other without conflict.​​

[0027] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper surface", "lower surface", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "forward rotation", "reverse rotation", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0028] As shown in Figure 1 A production module of a floating production storage and offloading device, comprising a produced water treatment module 1, a water injection module 2, a crude oil treatment module 3, a natural gas treatment module 4, a gas recovery device 5 and a flare system 6, the water injection module 2 is used to inject water to the wellhead of offshore oil production well 7 to maintain the pressure and productivity of the wellhead;

[0029] The crude oil transported from the offshore oil production well 7 is sent to the cargo oil tank 8 after dehydration treatment by the crude oil treatment module 3, the gas recovery device 5 is used to recover the gas breathed by the cargo oil tank 8. The natural gas after gas-liquid separation is sent to the natural gas treatment module 4 for treatment, and the treated natural gas is sent to the natural gas storage 10; the produced water obtained by the crude oil treatment module 3 is transported to the FPSO sewage tank 9, and the produced water treatment module 1 is used to treat the water in the FPSO sewage tank 9; the flare system 6 includes a high-pressure flare buffer tank 13, a low-pressure flare buffer tank 14, a flare 11 and a mechanical bullet igniter 12, when there is more gas breathed by the cargo oil tank 8 and production tail gas, the gas recovery device 5 cannot process in time, the gas is sent to the high-pressure flare buffer tank 13, the gas in the high-pressure flare buffer tank 13 is sent to the flare 11 through the low-pressure flare buffer tank 14, and the mechanical bullet igniter 12 is used to ignite the flare 11.

[0030] The water injection module 2 includes three ultra-fine filters 25 and an oxygen removal tower, the oxygen removal tower includes a first-stage negative pressure filler tower 26 and a second-stage negative pressure filler tower 27 connected in series, the vacuum degree in the first-stage negative pressure filler tower 26 is greater than that in the second-stage negative pressure filler tower 27, so as to reduce the power consumption of the vacuum pump of the second-stage negative pressure filler tower. The seawater is filtered by the three ultra-fine filters 25 and then sent to the oxygen removal tower to obtain injection liquid with solid particles less than 20 microns and oxygen content less than 5 ppbv. The ultra-fine filter 25 is provided with a hard coal filter layer 28, a coarse garnet filter layer 29 and a fine garnet filter layer 30.

[0031] The gas recovery device 5 includes a gas scrubber 50, a heat exchanger 51 and a screw compressor 52, and the gas breathed out by the cargo oil tank 8 is sequentially washed by the gas scrubber 50, heated by the heat exchanger 51 and low-pressure compressed by the screw compressor 52, and then sent into the natural gas storage 10.

[0032] As shown in Figure 2 The production water treatment module 1 includes a hydrocyclone 15, a compact air floatation unit 16, a pressure reduction pipeline 17 and a degassing tank 18, the production water in the FPSO sewage tank 9 enters the hydrocyclone 15, which is used to separate oil and water by utilizing the density difference between oil and water, and the production water after the cyclone separation flows into the compact air floatation unit 16 through a pipeline, which is used to float the oil droplets in the production water quickly by bubbles; when the production water flows into the compact air floatation unit, fuel gas (natural gas) is introduced into the compact air floatation unit 16 through an air inlet pipe 24, so that the pressure in the compact air floatation unit 16 increases, the fuel gas forms bubbles in the water in the compact air floatation unit, the oil in the water is adsorbed by the surface tension of the bubbles and floated, the production water saturated by the fuel gas adsorption is de-pressurized by the pressure reduction pipeline 17 and then sent into the degassing tank 18, the de-pressurized production water further forms small bubbles, which carry the oil droplets to float to the liquid surface of the production water in the degassing tank, the oil droplets on the surface of the production water enter the oil tank 20 through a V-shaped overflow port 19 at the upper part of the degassing tank 18, the oil in the oil tank 20 is sent to the crude oil treatment module 3 by an oil skimming pump 21 for treatment, and the production water discharged from the degassing tank 18, of which the oil content is reduced to 15 ppm, is discharged into the sea through a drainage pipeline 22. The drainage pipeline 22 is provided with an online oil-water analyzer 23, if the oil content in the water exceeds the standard, the water is returned to the FPSO sewage tank 9 for oil removal treatment again, so as to ensure no sewage discharge.

[0033] As shown in Figure 3 The crude oil treatment module 3 includes a feed heater 31, a first-stage gas-liquid separator 32, an inter-stage heater 33, a second-stage gas-liquid separator 34, a sand filter 35, an electric dehydration processor 36, a cargo oil cooler 37 and a cargo oil pump 38, the crude oil transported from the offshore oil well is heated by the feed heater 31 and then sequentially sent into the first-stage gas-liquid separator 32, the inter-stage heater 33 and the second-stage gas-liquid separator 34 for gas-liquid separation; the oil liquid after the gas-liquid separation is sent into the sand filter 35, which is used to remove the sand particles in the oil liquid, the oil liquid after the sand particles are removed is sent into the electric dehydration processor 36 for oil liquid dehydration treatment, then cooled by the cargo oil cooler 37, and sent into the cargo oil tank 8 by the cargo oil pump 38, the electric dehydration processor 36 is used to generate an electrostatic field by a single-phase high-voltage power supply, remove the water emulsified in the oil by electric aggregation, so as to make the water content in the oil meet the index BS&W <0.5%, and the gas separated by the first-stage gas-liquid separator 32 and the second-stage gas-liquid separator 34 is sent into the natural gas treatment module 4 through a natural gas delivery pipeline 39.

[0034] like Figure 4 As shown, the natural gas processing module 4 includes a low-pressure compressor 40, an ethylene glycol tower 41, a flash regeneration tower 42, a mercury removal device 43, a high-pressure compressor 44, and the natural gas storage silo 10. The gas after gas-liquid separation is compressed by the low-pressure compressor 40 and sent to the ethylene glycol tower 41. The ethylene glycol tower 41 is used to absorb saturated water in the natural gas. The ethylene glycol that has absorbed water is distilled by the flash regeneration tower 42 to separate the water from the ethylene glycol, so that the ethylene glycol can be recycled. The dehydrated natural gas is sent to the mercury removal device 43 for mercury removal treatment. The mercury-removed natural gas is pressurized to 140 barg by the high-pressure compressor 44 and then sent to the natural gas storage silo 10.

[0035] The ethylene glycol tower 41 is equipped with a liquid level control device, which includes a controller 45, an upper limit liquid level sensor 46, a lower limit liquid level sensor 47, and a flow regulating solenoid valve 48. The flow regulating solenoid valve 48 is located on the adsorbed water ethylene glycol output pipeline 49 between the ethylene glycol tower 41 and the flash regeneration tower 42. When the liquid level in the ethylene glycol tower 41 reaches the lower limit liquid level, the lower limit liquid level sensor 47 transmits information to the controller 45, and the controller 45 reduces the flow rate of the flow regulating solenoid valve 48. When the liquid level in the ethylene glycol tower 41 reaches the upper limit liquid level, the upper limit liquid level sensor 46 transmits information to the controller 45, and the controller 45 increases the flow rate of the flow regulating solenoid valve 48. This invention, by controlling the liquid level in the ethylene glycol tower, ensures that there is always liquid in the ethylene glycol tower, preventing high-pressure gas in the ethylene glycol tower 41 from entering the flash regeneration tower 42 and causing a fire or explosion in the flash regeneration tower 42. To reduce the likelihood of accidents and minimize the severity of consequences, this invention includes a liquid level control device.

[0036] The mercury removal device 43 adopts a chemical adsorbent mercury removal structure mode, and the mercury removal adsorbent in the mercury removal device does not need to be regenerated, and exists in the form of inorganic sulfide and is used to remove elemental mercury and organic mercury in the natural gas. The mercury has high volatility, high toxicity and strong corrosiveness, and the application requires that the mercury content of the natural gas is less than 0.1 ppb. The mercury in the natural gas mainly exists in the form of elemental mercury. The chemical adsorption mercury removal process of the application is superior to other mercury removal processes in economy, mercury removal effect and environmental protection. The selection of the mercury removal adsorbent is a key part of the chemical adsorption process, and the mercury removal adsorbent is divided into a carrier and a reactant, and the reactant is the main substance for mercury removal and is uniformly distributed in the porous carrier. The natural gas mercury removal agent mainly includes sulfur / silver loaded activated carbon, silver loaded molecular sieve and other special mercury removal agents. The sulfur / silver loaded activated carbon and the silver loaded molecular sieve are adsorbents that need to be regenerated, and the process flow is relatively complex, and the investment and the occupied deck area are large. The application selects a special mercury removal agent, which does not need to be regenerated. The service life can reach 5 years, and the mercury removal adsorbent can be sent to the factory for recycling after being used for 5 years. The process technology is advanced and economical.

[0037] In addition, those skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction. Although the embodiments of the application have been shown and described above, it is understood that the above embodiments are exemplary and cannot be construed as limiting the application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the application.

Claims

1. A production module of a floating production storage and offloading unit, comprising a production water treatment module, characterized in that: The production water treatment module comprises a hydrocyclone, a compact air floatation unit, a pressure reduction pipeline and a degassing tank. Production water in the FPSO sewage tank enters the hydrocyclone, which separates oil and water by using the density difference between oil and water. The separated production water flows into the compact air floatation unit through a pipeline. The compact air floatation unit uses bubbles to quickly float oil droplets in the production water. When the production water flows into the compact air floatation unit, fuel gas is introduced into the compact air floatation unit to increase the pressure in the compact air floatation unit. The fuel gas forms bubbles in the water in the compact air floatation unit. The bubbles adsorb oil in the water by surface tension and float to the surface of the water. The production water saturated with the bubbles is reduced in pressure by the pressure reduction pipeline and then sent into the degassing tank. The reduced production water further forms small bubbles, which carry oil droplets to float to the surface of the production water in the degassing tank. The oil droplets on the surface of the production water enter an oil tank through a V-shaped overflow port on the upper part of the degassing tank. The oil in the oil tank is pumped to the crude oil treatment module by an oil skimming pump. The production water discharged from the degassing tank has a reduced oil content of 15 ppm and is discharged into the sea through a drainage pipeline. The crude oil treatment module comprises a feed heater, a first-stage gas-liquid separator, an inter-stage heater, a second-stage gas-liquid separator, a sand filter, an electric dehydration processor, a cargo oil cooler and a cargo oil pump. Crude oil transported from offshore oil wells is heated by the feed heater and then sequentially sent into the first-stage gas-liquid separator, the inter-stage heater and the second-stage gas-liquid separator for gas-liquid separation. The separated oil liquid is sent into the sand filter to remove sand particles. The oil liquid after the sand particles are removed is sent into the electric dehydration processor for oil liquid dehydration treatment. The treated oil liquid is cooled by the cargo oil cooler and then pumped into a cargo oil tank by the cargo oil pump. The electric dehydration processor uses a single-phase high-voltage power supply to generate an electrostatic field to remove water emulsified in the oil by electric aggregation. The separated natural gas is sent into a natural gas treatment module for treatment. The production water treated by the crude oil treatment module is transported into the FPSO sewage tank. The natural gas treatment module comprises a low-pressure compressor, a glycol tower, a flash regeneration tower, a mercury removal device, a high-pressure compressor and a natural gas storage. The separated gas is compressed by the low-pressure compressor and then sent into the glycol tower. The glycol tower absorbs saturated water in the natural gas. The water is separated from the glycol by distillation in the flash regeneration tower to recycle the glycol. The dehydrated natural gas is sent into the mercury removal device for mercury removal treatment. The treated natural gas is pressurized to 140 barg by the high-pressure compressor and then sent into the natural gas storage. The glycol column is provided with a liquid level regulating device, which comprises a controller, an upper limit liquid level sensor, a lower limit liquid level sensor and a flow regulating electromagnetic valve, and the flow regulating electromagnetic valve is arranged on the adsorbed water glycol output pipeline between the glycol column and the flash regeneration column; when the liquid level in the glycol column reaches the lower limit liquid level position, the lower limit liquid level sensor transmits information to the controller, and the controller reduces the flow of the flow regulating electromagnetic valve; when the liquid level in the glycol column reaches the upper limit liquid level position, the upper limit liquid level sensor transmits information to the controller, and the controller increases the flow of the flow regulating electromagnetic valve.

2. A production module for a floating production storage and offloading unit according to claim 1, characterized in that: An online oil-water analyzer is arranged in the drainage pipeline, and if the oil content in the water exceeds the standard, the water is returned to the FPSO sewage tank.

3. A production module for a floating production storage and offloading unit according to claim 1, characterized in that: The water injection module is used to inject seawater into the wellhead of the offshore oil production well to maintain the pressure and productivity of the oil production wellhead; the water injection module comprises three ultra-fine filters and a deaeration tower, and the seawater filtered by the three ultra-fine filters is sent into the deaeration tower to obtain the injection liquid with the solid particles less than 20 microns and the oxygen content less than 5 ppbv.

4. A production module for a floating production storage and offloading unit according to claim 3, characterized in that: The ultra-fine filter is provided with a hard coal filter layer, a coarse garnet filter layer and a fine garnet filter layer; the deaeration tower comprises a first-stage negative pressure packed tower and a second-stage negative pressure packed tower connected in series, and the vacuum degree of the first-stage negative pressure packed tower is greater than that of the second-stage negative pressure packed tower, so as to reduce the power consumption of the vacuum pump of the second-stage negative pressure packed tower.

5. The production module of a floating production storage and offloading unit according to claim 1, characterized in that: The mercury removal device adopts a chemical adsorbent mercury removal structure mode, the mercury removal adsorbent in the mercury removal device does not need to be regenerated, and the mercury removal adsorbent exists in the form of inorganic sulfide to remove elemental mercury and organic mercury in the natural gas.

6. A production module for a floating production storage and offloading unit according to claim 5, characterized in that: The gas recovery device is used to recover the gas discharged by breathing of the cargo oil tank, and the gas recovery device comprises a gas scrubber, a heat exchanger and a screw compressor, and the gas discharged by breathing of the cargo oil tank is sequentially washed, heated and low-pressure compressed by the gas scrubber, the heat exchanger and the screw compressor, and then sent into the natural gas storage bin.

7. A production module for a floating production storage and offloading unit according to claim 6, characterized in that: The flare system comprises a high-pressure flare buffer tank, a low-pressure flare buffer tank, a flare and a mechanical bullet igniter, when the gas discharged by breathing of the cargo oil tank and the production tail gas are more, and the gas recovery device cannot process them in time, the gas is sent into the high-pressure flare buffer tank, the gas in the high-pressure flare buffer tank is sent into the flare through the low-pressure flare buffer tank, and the mechanical bullet igniter is used to ignite the flare.

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