A method for expanding the crude oil processing capacity of a marine three-phase separator

Abstract

The application discloses a method for expanding and reconstructing crude oil processing capacity of a marine three-phase separator, and relates to the technical field of oil and gas water treatment of marine petroleum engineering. The method comprises the following steps: step a: an external container is arranged at the adjacent position of the three-phase separator, the external container serves as a newly-added oil chamber of the three-phase separator, and the inner cavity of the original three-phase separator serves as an oil-water mixing chamber. The method has the advantages that the external container is arranged at the adjacent position of the three-phase separator to serve as the newly-added oil chamber, the internal structure of the original three-phase separator remains unchanged, the production needs not to be stopped, the internal components of the separator need not to be reconstructed in a tank-opening mode, or the whole separator needs not to be replaced, the oil chamber volume is increased, the residence time of crude oil is prolonged, the expansion of the crude oil processing capacity is realized, the production stop period required by platform reconstruction is shortened, the large-scale reconstruction demand of the two-phase separator caused by the increase of the liquid-phase oil-water separation function is effectively solved, and the engineering investment cost is reduced.

Description

Technical Field

[0001] This invention belongs to the field of oil, gas and water treatment technology in marine oil engineering, and in particular relates to a method for expanding and upgrading the crude oil processing capacity of a marine three-phase separator. Background Technology

[0002] Three-phase separators are among the most critical pieces of equipment in the oil, gas, and water treatment process on offshore platforms. They separate the incoming fluid from the wellhead into gas, oil, and water phases, and their separation efficiency directly impacts the normal production and overall efficiency of the platform's oil, gas, and water system. With the deepening of oilfield development, parameters such as wellhead fluid production, water cut, and gas-liquid ratio have changed significantly. The crude oil processing capacity of existing three-phase separators is gradually failing to meet the increasing production demands, necessitating capacity expansion and upgrades. However, offshore platforms face strict limitations in space, crane resources, and downtime windows. Therefore, how to efficiently and economically enhance the crude oil processing capacity of existing three-phase separators has become a pressing issue in the field of offshore oil engineering.

[0003] A Chinese patent application with publication number CN117193438A discloses an intelligent adjustment device and optimization method for the treatment effect of a three-phase separator on an offshore platform. The device includes a first process pipeline, a chemical reagent pipeline, a three-phase separator, and a control system. The first process pipeline is adapted to transport a gas-liquid mixture from the subsea pipeline outlet to the three-phase separator and is equipped with an electric heater. The chemical reagent pipeline is adapted to transport chemical reagents to the three-phase separator. The three-phase separator is divided into a first chamber and a second chamber by a weir plate. The bottom of the first chamber is connected to a water phase output pipeline, and the top is connected to a gas phase output pipeline. The bottom of the second chamber is connected to an oil phase output pipeline. The control system is adapted to establish a calculation model to evaluate the treatment capacity of the three-phase separator in real time and optimize the operating parameters.

[0004] Although this patent can optimize and adjust the operating parameters of the three-phase separator through the control system, thereby improving the separation effect to some extent, it still has the following shortcomings: it only adjusts and optimizes the operating parameters of the three-phase separator, while the structural parameters such as the oil chamber volume and physical height of the three-phase separator remain unchanged. The residence time of crude oil in the separator is limited by the tank size, which cannot fundamentally improve the crude oil processing capacity of the three-phase separator. When the oilfield production increases beyond the original design capacity of the separator, it is still necessary to shut down the production, open the tank to modify the internal components of the separator, or replace the entire separator. Offshore platforms have long shutdown cycles and high modification investments, and the weir plate height is fixed and cannot be flexibly adjusted according to the incoming liquid conditions. Therefore, we provide a method for expanding and modifying the crude oil processing capacity of offshore three-phase separators to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a method for expanding and upgrading the crude oil processing capacity of a marine three-phase separator. By using an external container and isolation valves installed at different liquid level heights in the three-phase separator cylinder, this invention solves the problems in the prior art where the crude oil processing capacity of the three-phase separator is insufficient, requiring shutdown and tank opening for modification or complete replacement of the separator, resulting in long shutdown cycles and high investment, and the physical height being fixed and unable to be flexibly adjusted according to the incoming liquid conditions.

[0006] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution.

[0007] This invention relates to a method for expanding and upgrading the crude oil processing capacity of a marine three-phase separator, comprising the following steps: Step a: Install an external container near the three-phase separator. The external container serves as the newly added oil chamber of the three-phase separator, and the original three-phase separator's inner cavity serves as the oil-water mixing chamber. The internal structure of the original three-phase separator remains unchanged. Step b: Connect the upper space of the external container to the gas phase space of the three-phase separator through the first pipeline, and install a first valve on the first pipeline to achieve pressure balance between the external container and the three-phase separator; Step c: Isolation valves are added at different liquid level heights in the three-phase separator cylinder, and each isolation valve is connected to the external container through a second pipeline. The second pipeline is equipped with a second valve, and the isolation valves at different heights are equivalent to weirs at different heights. Step d: An open drain port and a closed drain port are provided at the bottom of the external container for periodically discharging and renewing the crude oil accumulated in the external container; Step e: Install a level gauge on the external container. The level gauge is connected to the level control system. The level control system controls the opening and closing of the external container discharge according to the level of the liquid in the external container, and alarms are triggered for high and low liquid levels. Step f: During commissioning, select and open the isolation valve at the corresponding height position and close the isolation valves at the other height positions according to the incoming liquid conditions. The crude oil after oil-water separation in the three-phase separator overflows from the opened isolation valve into the external container to increase the oil chamber volume and extend the crude oil residence time, thereby expanding the crude oil processing capacity. When the incoming liquid conditions change, switch to open the isolation valves at different height positions, which is equivalent to adjusting the weir plate height, thereby adjusting and optimizing the oil-water separation effect and crude oil processing capacity.

[0008] The present invention is further configured such that the external container is located near the liquid outlet of the three-phase separator.

[0009] The present invention is further configured such that the external container is a tubular container or a pressure vessel.

[0010] The present invention is further configured such that, when the external container is a tubular container, the number of tubular containers is adjustable; the upper part of the added tubular container is connected to the upper space of the aforementioned tubular container through pipelines and valves, and the lower part of the added tubular container is connected to the lower part of the aforementioned tubular container through pipelines and valves; and each tubular container is provided with an open drain port and a closed drain port at its bottom, so as to realize flexible adjustment of the expansion volume and further improve the crude oil processing capacity.

[0011] The invention is further configured such that the isolation valve is located between 1 / 4 and 3 / 4 of the height of the three-phase separator cylinder, and the number of valves is 1 to 10.

[0012] The present invention is further configured such that the first valve on the first pipeline remains open during operation after the expansion and modification, so as to maintain the pressure balance between the external container and the gas phase space of the three-phase separator.

[0013] The present invention is further configured such that the open drain interface is connected to the platform's open discharge system, and the closed drain interface is connected to the platform's closed discharge system. By periodically opening the open or closed drain interface to discharge and refresh the crude oil in the external container, the system can maintain efficient operation.

[0014] The present invention is further configured such that the liquid level control system includes a controller and a liquid level control valve installed on the discharge pipeline at the bottom of the external container. The controller controls the opening and closing of the liquid level control valve according to the liquid level signal detected by the liquid level gauge, and issues an alarm when the liquid level is high or low.

[0015] The present invention is further configured such that the gas phase space of the three-phase separator is equipped with a pressure gauge and a pressure control valve, the pressure of the gas phase space is monitored by the pressure gauge, and the pressure of the gas phase space is adjusted by the pressure control valve to maintain the pressure stability of the system after the expansion and modification.

[0016] The present invention is further configured such that, in step f, the isolation valve at the corresponding height position is selected and switched to open according to the water content and processing volume of the incoming liquid, so as to effectively adjust the height of the weir plate, thereby adjusting the liquid level in the three-phase separator and the residence time of crude oil in the oil chamber, and optimizing the oil-water separation effect and crude oil processing capacity.

[0017] The present invention has the following beneficial effects.

[0018] 1. This invention increases the oil chamber volume and extends the crude oil residence time by setting an external container near the three-phase separator to serve as an additional oil chamber. The internal structure of the original three-phase separator remains unchanged, and there is no need to stop production, open the tank to modify the internal components of the separator or replace the entire separator. This expands the crude oil processing capacity, shortens the downtime required for platform modification, effectively solves the need for large-scale modification of the two-phase separator due to the addition of liquid phase oil-water separation function, and reduces the engineering investment cost.

[0019] 2. This invention adds isolation valves at different liquid level heights in the three-phase separator cylinder. The isolation valves at different heights are equivalent to weirs at different heights. The height of the weir can be adjusted by simply opening or switching the opening of the isolation valve at the corresponding height. The oil-water separation effect and crude oil processing capacity can be flexibly adjusted and optimized according to the incoming liquid conditions without stopping production and opening the tank. The adjustment method is simple, safe and reliable.

[0020] 3. This invention achieves pressure balance by connecting the upper space of the external container with the gas phase space of the three-phase separator. The open and closed drain ports at the bottom of the external container can periodically discharge and refresh the crude oil in the container. The level gauge and level control system realize automatic control of discharge and high and low level alarms, ensuring the long-term efficient, safe and stable operation of the system after the expansion and modification. Moreover, the number of tubular containers is adjustable, and the expansion volume is flexible, which is suitable for the expansion and modification of three-phase separators on various offshore platforms and has a wide range of application prospects. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0022] Figure 1 This is a general flow chart of a method for expanding and upgrading the crude oil processing capacity of a marine three-phase separator.

[0023] Figure 2 This is a flowchart illustrating the commissioning and adjustment process in a method for expanding and upgrading the crude oil processing capacity of a marine three-phase separator.

[0024] Figure 3 This is a flowchart illustrating the steps involved in expanding and upgrading the crude oil processing capacity of a marine three-phase separator. Detailed Implementation

[0025] The technical solutions of the present invention will be described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present invention, and not all embodiments.

[0026] Please see Figure 1-3 This invention relates to a method for expanding and upgrading the crude oil processing capacity of a marine three-phase separator, comprising the following steps: Step a: Install an external container near the three-phase separator. The external container serves as the newly added oil chamber of the three-phase separator, and the original three-phase separator's inner cavity serves as the oil-water mixing chamber. The internal structure of the original three-phase separator remains unchanged. Step b: Connect the upper space of the external container to the gas phase space of the three-phase separator through the first pipeline, and install the first valve on the first pipeline to achieve pressure balance between the external container and the three-phase separator; Step c: Install isolation valves at different liquid level heights in the three-phase separator cylinder, and connect each isolation valve to an external container through a second pipeline. The second pipeline is equipped with a second valve, and the isolation valves at different heights are equivalent to weirs at different heights. Step d: Install open and closed drain ports at the bottom of the external container for periodically draining and renewing the crude oil accumulated inside the external container; Step e: Install a level gauge on the external container, connect the level gauge to the level control system, and control the opening and closing of the external container discharge according to the level of the liquid in the external container, and issue alarms for high and low liquid levels. Step f: During commissioning, select and open the isolation valve at the corresponding height position and close the isolation valves at the other height positions according to the incoming liquid conditions. The crude oil after oil-water separation in the three-phase separator overflows from the opened isolation valve into the external container to increase the oil chamber volume and extend the crude oil residence time, thereby expanding the crude oil processing capacity. When the incoming liquid conditions change, switch to open the isolation valves at different height positions, which is equivalent to adjusting the weir plate height, thereby adjusting and optimizing the oil-water separation effect and crude oil processing capacity.

[0027] Specifically, the external container is located adjacent to the three-phase separator. The inner cavity of the external container serves as the newly added oil chamber of the three-phase separator, while the inner cavity of the original three-phase separator serves as the oil-water mixing chamber. The expansion and modification process does not require any changes to the internal structure of the original three-phase separator, nor does it require the addition of a weir plate inside the original three-phase separator. The upper space of the external container is connected to the gas phase space of the original three-phase separator through a first pipeline. A first valve is installed on the first pipeline to ensure that the pressure inside the external container is always consistent with the pressure in the gas phase space of the original three-phase separator, forming an isobaric interconnected system. Crude oil can flow smoothly between the external container and the original three-phase separator due to the liquid level difference, without being hindered from entering the crude oil due to pressure buildup in the external container. Isolation valves are newly installed at different liquid level positions within the original three-phase separator cylinder. Each isolation valve is connected to an external container via a second pipeline, on which a second valve is installed. These isolation valves at different heights act as weirs at different heights. When an isolation valve at a certain height is opened, crude oil in the original three-phase separator that is higher than that height overflows into the external container through the isolation valve and the second pipeline. The liquid level in the original three-phase separator then stabilizes at the height of that isolation valve, effectively functioning as a weir at that position. The bottom of the external container has open and closed drain ports for periodically discharging and replenishing the accumulated crude oil. A level gauge installed on the external container is connected to a level control system. The level control system controls the opening and closing of the external container's discharge based on the liquid level and provides alarms for high and low liquid levels. Through the combination of the above structures, the oil-water separation function of the original three-phase separator remains unchanged, while the crude oil settling space is expanded from inside the original three-phase separator to an external container, increasing the oil chamber volume and correspondingly extending the residence time of crude oil within the oil chamber, thus expanding the crude oil processing capacity. When the output or water content of the incoming liquid changes, simply closing the previously open isolation valve and opening an isolation valve at another height position is equivalent to changing the weir height. The required liquid level and residence time for oil-water separation can be rematched without shutting down production and opening the tank. This capacity expansion modification does not require cutting or replacing the internal components of the original three-phase separator, nor does it require replacing the entire separator. The shutdown period for offshore platforms is short, the modification workload is small, and the weir height is no longer fixed. This solves the problems of fixed oil chamber volume and weir height in the three-phase separator, the inability to fundamentally improve crude oil processing capacity, and the long shutdown period and high investment required for capacity expansion modifications in the background technology.

[0028] The external container is located near the outlet of the three-phase separator, facilitating the direct entry of crude oil from the self-opening isolation valve into the external container via the second pipeline, thus shortening the length of the connecting pipeline. The external container can be a tubular container or a pressure tank; both structures can be used as additional oil chambers in the three-phase separator. When the external container is a tubular container, the number of tubular containers is adjustable. The upper part of the added tubular container is connected to the upper space of the aforementioned tubular container via pipelines and valves, and the lower part of the added tubular container is connected to the lower part of the aforementioned tubular container via pipelines and valves. Each tubular container has open and closed drain ports at its bottom. By increasing or decreasing the number of tubular containers put into operation, the expansion volume can be flexibly adjusted to further improve crude oil processing capacity. Isolation valves are installed between 1 / 4 and 3 / 4 of the diameter of the three-phase separator cylinder, with 1 to 10 valves installed. The first valve on the first pipeline remains open during operation after the expansion modification to maintain pressure balance between the external container and the gas phase space of the three-phase separator. The open drain port connects to the platform's open discharge system, while the closed drain port connects to the platform's closed discharge system. The system maintains efficient operation by periodically opening either the open or closed drain port to discharge and refresh the crude oil in the external container. The level control system includes a controller and a level control valve located on the discharge pipeline at the bottom of the external container. The controller controls the opening and closing of the level control valve based on the level signal detected by the level gauge and issues alarms for high and low levels. The gas phase space of the three-phase separator is equipped with a pressure gauge and a pressure control valve. The pressure gauge monitors the pressure in the gas phase space, and the pressure control valve regulates the pressure to maintain stable system pressure after the expansion and modification.

[0029] Specifically, when adjusting the oil-water separation effect and crude oil processing capacity, the height position of the isolation valve to be opened is selected according to the water content and processing volume of the incoming liquid: when the incoming liquid processing volume increases or the water content rises, the isolation valve at a higher position is opened to maintain a higher liquid level in the original three-phase separator, extending the residence time of the liquid phase in the oil-water mixing chamber and making the oil-water separation more complete; when the incoming liquid processing volume decreases or the water content decreases, the isolation valve at a lower position is opened to maintain a lower liquid level in the original three-phase separator, increasing the gas phase space and preventing the liquid phase from flowing out with the gas phase. During the switching process, only the originally opened isolation valve needs to be closed and the isolation valve at the target height position needs to be opened. The original three-phase separator does not stop production, and the liquid level in the external container is automatically maintained within the normal range by the liquid level control system.

[0030] Example 1 This embodiment uses the expansion and modification of an in-service horizontal three-phase separator as an example. The original crude oil processing capacity of this three-phase separator can no longer meet the current production needs of the oilfield. The expansion and modification method of this invention is used: a pressure tank is installed near the outlet of the three-phase separator as an external container. The pressure tank serves as the newly added oil chamber of the three-phase separator, and the original inner cavity of the three-phase separator serves as the oil-water mixing chamber. The internal structure of the original three-phase separator remains unchanged. The upper space of the pressure tank is connected to the gas phase space of the original three-phase separator through a first pipeline. A first valve is installed on the first pipeline, and the first valve remains open after the modification. Three isolation valves are added at 1 / 4, 1 / 2, and 3 / 4 of the original three-phase separator cylinder diameter, respectively. These three isolation valves are connected to the pressure tank through a second pipeline. A second valve is installed on the second pipeline; an open drain port and a closed drain port are installed at the bottom of the pressure tank. The open drain port is connected to the platform's open discharge system, and the closed drain port is connected to the platform's closed discharge system; a level gauge is installed on the pressure tank and connected to the level control system. The level control system includes a controller and a level control valve installed on the discharge pipeline at the bottom of the pressure tank. The controller controls the opening and closing of the level control valve based on the level signal detected by the level gauge and issues alarms when the level is high or low; a pressure gauge and a pressure control valve are installed in the gas phase space of the original three-phase separator. The pressure gauge monitors the pressure in the gas phase space, and the pressure control valve adjusts the pressure in the gas phase space. During commissioning, first open the isolation valve located at half the height of the cylinder diameter and close the other two isolation valves. The crude oil separated from the oil in the original three-phase separator overflows into the pressure tank through this isolation valve. When the water content of the incoming liquid increases and the oil-water separation time needs to be extended, close the isolation valve located at half the height of the cylinder diameter and open the isolation valve located at three-quarters the height of the cylinder diameter, which is equivalent to raising the weir height from half to three-quarters of the cylinder diameter. When the incoming liquid throughput decreases, simply switch to opening the isolation valve located at one-quarter the height of the cylinder diameter. The entire modification process does not require opening the original three-phase separator or replacing its internal components. The modification period is short, and after commissioning, the isolation valves can be switched at any time according to the incoming liquid conditions.

[0031] Example 2 This embodiment uses the expansion and modification of an in-service three-phase separator with limited platform space and increasing production year by year as an example. The expansion and modification method of this invention is used: two tubular containers are installed near the three-phase separator as external containers. The upper space of the first tubular container is connected to the gas phase space of the original three-phase separator via a first pipeline, and a first valve is installed on the first pipeline. The upper part of the second tubular container is connected to the upper space of the first tubular container via a pipeline and a valve, and the lower part of the second tubular container is connected to the lower part of the first tubular container via a pipeline and a valve. Open and closed drain interfaces are respectively installed at the bottom of the two tubular containers. The open drain interface is connected to the platform's open discharge system, and the closed drain interface is connected to the platform's closed discharge system. Five isolation valves are evenly added between 1 / 4 and 3 / 4 of the original three-phase separator's cylinder diameter and height. These five isolation valves are connected to the first tubular container via a second pipeline, and a second valve is installed on the second pipeline. A level gauge is installed on the first tubular container and connected to the level control system. When oilfield production is low in the initial stage after the renovation, only the first tubular container is put into operation, while the valves at the top and bottom of the second tubular container are closed. When oilfield production increases and further expansion of crude oil processing capacity is needed, the valves at the top and bottom of the second tubular container are opened, and the second tubular container is put into operation, with the expansion volume increasing accordingly, without the need for another shutdown for renovation. The tubular containers can be fabricated using existing large-diameter pipeline sections on the platform, occupying little space and offering flexible layout, making them suitable for space-constrained offshore platforms.

[0032] The working principle of this invention is as follows: After the wellhead fluid enters the three-phase separator, the gas phase rises into the gas phase space, while the liquid phase, acting as the oil-water mixing chamber, separates into oil and water phases by gravity settling within the original three-phase separator cavity. Since the upper space of the external container is connected to the gas phase space of the three-phase separator via a first pipeline and a first valve, the external container and the three-phase separator are in the same pressure system. When the oil phase level rises to the height of the open isolation valve, the separated crude oil overflows into the external container through the isolation valve and the second pipeline. The liquid level in the three-phase separator then stabilizes at the height of the isolation valve, which functions similarly to a contour weir. After entering the external container, the crude oil remains stationary. The external container and the original oil-water mixing chamber of the three-phase separator together constitute an expanded oil phase processing space, correspondingly extending the residence time of the crude oil and increasing the amount of crude oil that can be processed per unit time. The liquid level in the external container is monitored in real time by a level gauge. The level control system controls the opening and closing of the external container's discharge based on the liquid level, maintaining the liquid level within a set range and triggering alarms for high and low levels. Open and closed drain ports are used to periodically discharge and refresh the crude oil accumulated in the external container, ensuring a continuous supply of crude oil. When the water content or throughput of the incoming liquid changes, the isolation valves at different heights are switched on, effectively changing the weir height. This allows for a re-matching of the required liquid level and residence time for oil-water separation without altering the original internal structure of the three-phase separator.

Claims

1. A method for expanding and upgrading the crude oil processing capacity of a marine three-phase separator, characterized in that: Includes the following steps: Step a: Install an external container near the three-phase separator. The external container serves as the newly added oil chamber of the three-phase separator, and the original three-phase separator's inner cavity serves as the oil-water mixing chamber. The internal structure of the original three-phase separator remains unchanged. Step b: Connect the upper space of the external container to the gas phase space of the three-phase separator through the first pipeline, and install a first valve on the first pipeline to achieve pressure balance between the external container and the three-phase separator; Step c: Isolation valves are added at different liquid level heights in the three-phase separator cylinder, and each isolation valve is connected to the external container through a second pipeline. The second pipeline is equipped with a second valve, and the isolation valves at different heights are equivalent to weirs at different heights. Step d: An open drain port and a closed drain port are provided at the bottom of the external container for periodically discharging and renewing the crude oil accumulated in the external container; Step e: Install a level gauge on the external container. The level gauge is connected to the level control system. The level control system controls the opening and closing of the external container discharge according to the level of the liquid in the external container, and alarms are triggered for high and low liquid levels. Step f: During commissioning, select and open the isolation valve at the corresponding height position and close the isolation valves at the other height positions according to the incoming liquid conditions. The crude oil after oil-water separation in the three-phase separator overflows from the opened isolation valve into the external container to increase the oil chamber volume and extend the crude oil residence time, thereby expanding the crude oil processing capacity. When the incoming liquid conditions change, switch to open the isolation valves at different height positions, which is equivalent to adjusting the weir plate height, thereby adjusting and optimizing the oil-water separation effect and crude oil processing capacity.

2. The method for expanding and upgrading the crude oil processing capacity of a marine three-phase separator according to claim 1, characterized in that: The external container is located near the liquid outlet of the three-phase separator.

3. The method for expanding and upgrading the crude oil processing capacity of a marine three-phase separator according to claim 1, characterized in that: The external container is a tubular container or a pressure vessel.

4. The method for expanding and upgrading the crude oil processing capacity of a marine three-phase separator according to claim 1, characterized in that: When the external container is a tubular container, the number of tubular containers is adjustable; the upper part of the added tubular container is connected to the upper space of the aforementioned tubular container through pipelines and valves, and the lower part of the added tubular container is connected to the lower part of the aforementioned tubular container through pipelines and valves. Each tubular container is provided with an open drain port and a closed drain port at its bottom to achieve flexible adjustment of the expanded volume and further improve crude oil processing capacity.

5. The method for expanding and upgrading the crude oil processing capacity of a marine three-phase separator according to claim 1, characterized in that: The isolation valves are installed between 1 / 4 and 3 / 4 of the diameter of the three-phase separator cylinder, and the number of valves is 1 to 10.

6. The method for expanding and upgrading the crude oil processing capacity of a marine three-phase separator according to claim 1, characterized in that: The first valve on the first pipeline remains open during the operation after the expansion and modification to maintain the pressure balance between the external container and the gas phase space of the three-phase separator.

7. The method for expanding and upgrading the crude oil processing capacity of a marine three-phase separator according to claim 1, characterized in that: The open drain interface is connected to the platform's open discharge system, and the closed drain interface is connected to the platform's closed discharge system. By periodically opening the open or closed drain interface to discharge and refresh the crude oil in the external container, the system maintains efficient operation.

8. The method for expanding and upgrading the crude oil processing capacity of a marine three-phase separator according to claim 1, characterized in that: The liquid level control system includes a controller and a liquid level control valve installed on the discharge pipeline at the bottom of the external container. The controller controls the opening and closing of the liquid level control valve according to the liquid level signal detected by the liquid level gauge, and issues an alarm when the liquid level is high or low.

9. A method for expanding and upgrading the crude oil processing capacity of a marine three-phase separator according to claim 1, characterized in that: The gas phase space of the three-phase separator is equipped with a pressure gauge and a pressure control valve. The pressure of the gas phase space is monitored by the pressure gauge and adjusted by the pressure control valve to maintain the pressure stability of the system after the expansion and modification.

10. A method for expanding and upgrading the crude oil processing capacity of a marine three-phase separator according to claim 1, characterized in that: In step f, the isolation valve at the corresponding height position is selected and switched to open according to the water content and processing volume of the incoming liquid, so as to effectively adjust the height of the weir plate, thereby adjusting the liquid level in the three-phase separator and the residence time of crude oil in the oil chamber, optimizing the oil-water separation effect and crude oil processing capacity.

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