An anti-sloshing oil-gas-water separator and its separation method suitable for water treatment of deep-sea oil and gas platforms

Abstract

This invention discloses an anti-sloshing oil-gas-water three-phase separator and its separation method suitable for water treatment on deep-sea oil and gas platforms. The three-phase separator includes an oil-gas-water mixture inlet, an inlet chamber, a flow-dividing chamber, a three-phase separation chamber, and water phase outlets, oil phase outlets, and gas phase outlets. By incorporating porous guide plates, a porous medium stabilizing bed, a vertical porous medium stabilizing module, and staged stabilizing baffles inside the separator, the incoming flow is subjected to staged diffusion and stabilization treatment. Under sloshing conditions such as platform roll, pitch, and heave, internal fluid fluctuations are effectively reduced, the oil, gas, and water three-phase interface positions are stabilized, and continuous and stable separation of the three phases is achieved. The device of this invention has a compact structure and strong adaptability, and is suitable for water treatment systems under high sloshing conditions such as deep-sea floating oil and gas platforms.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas platform water treatment technology, specifically, it relates to an anti-sloshing oil-gas-water separator and its separation method suitable for deep-sea oil and gas platform water treatment. Background Technology

[0002] As offshore oil and gas resource development gradually shifts from nearshore to deep-sea areas, floating oil and gas production platforms inevitably experience the combined effects of marine environmental loads such as wind, waves, and currents during long-term service. The platform as a whole and its internal processing equipment are often subjected to complex swaying conditions including rolling, pitching, and heave. Under these conditions, the flow state of the oil-gas-water mixture exhibits strong unsteady-state characteristics, with violent fluctuations in the free liquid surface and frequent changes in interface positions, posing significant challenges to the stable separation of the oil, gas, and water phases.

[0003] Currently, existing three-phase oil-gas-water separation technologies and equipment have many limitations. For example, CN 121266195A discloses an enhanced separation device and method for washing, desolidification, and defoaming in a coal liquefaction system. However, this type of separator is mainly designed based on the principle of gravity settling and is suitable for land-based or fixed offshore platforms with relatively stable operating conditions. When applied to deep-sea floating platforms, the internal flow field of the separator is prone to backflow, short-circuit flow, and local high-speed disturbances due to the platform's swaying. This leads to problems such as damage to the oil-water interface, re-emulsification of oil droplets, and entrainment of liquid droplets in the gas phase, which significantly reduces separation efficiency and may even cause the oil content in the effluent and the liquid content in the effluent to exceed the standards.

[0004] To improve three-phase separation performance, some existing technologies enhance the phase separation process by increasing the number of internal baffles, extending the residence time, or incorporating swirling structures. However, while this approach can improve separation efficiency under steady-state conditions to some extent, it has limited effectiveness in suppressing overall liquid swaying, transient flow fluctuations, and multiphase coupling disturbances under sloshing conditions. Furthermore, it remains difficult to balance separation efficiency, structural compactness, and operational stability under complex operating conditions. Summary of the Invention

[0005] The purpose of this invention is to overcome the defects in the prior art and provide an anti-sloshing oil-gas-water separator suitable for water treatment of deep-sea oil and gas platforms. By optimizing the internal flow path and flow stabilization structure of the separator, it effectively weakens fluid fluctuations under complex working conditions such as platform roll, pitch, and heave, and stabilizes the position of the three-phase interface of oil, gas, and water, thereby achieving efficient and reliable separation of the three phases.

[0006] The objective of this invention can be achieved through the following technical solutions: This invention provides an anti-sloshing oil-gas-water separator suitable for water treatment on deep-sea oil and gas platforms. The separator body is a horizontal tank, with an inlet chamber, a diversion chamber, and a three-phase separation chamber arranged sequentially along the flow direction of the oil-gas-water mixture. The inlet chamber is located directly below the diversion chamber, and the three-phase separation chamber is located downstream of the diversion chamber. An oil-gas-water mixture inlet is provided on the lower side wall of the horizontal tank corresponding to the inlet chamber. A vertically arranged diversion plate is arranged radially inside the horizontal tank near the oil-gas-water mixture inlet, and a horizontally arranged porous guide plate is arranged at its axial center. The porous guide plate is connected to the diversion plate and is used to divide the horizontal tank into the inlet chamber, the diversion chamber, and the three-phase separation chamber.

[0007] In some embodiments of the present invention, the inlet chamber is formed by a porous guide plate, the lower half of a flow divider plate, and a portion of the inner wall of a horizontal tank. The porous guide plate has a uniformly perforated structure with an opening ratio θ1 of 20% to 50% and a pore diameter φ1 of 5mm to 15mm, which makes the flow velocity distribution of the mixture entering the separator more uniform and reduces the instantaneous momentum of the incoming flow. The lower half of the flow divider plate has a non-perforated structure to prevent high-momentum fluid from directly impacting the downstream area.

[0008] In some embodiments of the present invention, the flow-dividing chamber is formed by a porous guide plate, the upper half of the flow-dividing plate and a portion of the inner wall of the horizontal tank. The upper half of the flow-dividing plate has a uniformly perforated structure with an opening ratio θ2 of 30% to 40% and a hole diameter φ2 of 8 mm to 12 mm.

[0009] In some embodiments of the present invention, the three-phase separation chamber is formed by a flow divider and another part of the inner wall of a horizontal tank, and a porous medium stabilizing bed is laid at the bottom of the chamber. The porous medium stabilizing bed is filled with porous medium particles with a particle size d of 8 mm to 12 mm. The height h of the porous medium stabilizing bed is 5% to 15% of the tank diameter D, and the overall porosity of the bed is 0.3 to 0.5. The three-phase separation chamber has several parallel vertical porous media flow stabilization modules arranged sequentially along the main flow direction of the mixture. The spacing L between these vertical porous media flow stabilization modules is equal to the tank length L. T The vertical porous medium flow stabilizing module can be formed by internally filling porous medium particles or by weaving an integrated fiber material, with a thickness σ of 50mm to 100mm and an overall porosity of 0.2 to 0.5.

[0010] In some embodiments of the present invention, a primary flow stabilizing baffle, a secondary flow stabilizing baffle, and a tertiary flow stabilizing baffle are arranged laterally along the inner wall of the horizontal tank at different height positions of the three-phase separation chamber; wherein the primary flow stabilizing baffle, the secondary flow stabilizing baffle, and the tertiary flow stabilizing baffle are respectively located in the upper region, the middle region, and the lower region of the three-phase separation chamber.

[0011] Furthermore, the height of the first-stage flow stabilizing baffle from the bottom of the three-phase separator is approximately 3 / 4 of the tank diameter D, and the baffle width does not exceed 1 / 5 of the tank diameter D; the height of the second-stage flow stabilizing baffle from the bottom of the three-phase separator is approximately 1 / 2 of the tank diameter D, and the baffle width does not exceed 1 / 4 of the tank diameter D; the height of the third-stage flow stabilizing baffle from the bottom of the three-phase separator is approximately 1 / 4 of the tank diameter D, and the baffle width does not exceed 1 / 5 of the tank diameter D.

[0012] In some embodiments of the present invention, an oil collection tank is provided after the last vertical porous medium flow stabilization module; the height of the baffle on the side of the oil collection tank closer to the incoming flow direction is lower than the height of the baffle on the side farther from the incoming flow direction, so as to facilitate the upward oil phase to collect into the oil collection tank under sloshing conditions; an oil phase outlet is provided at the bottom of the oil collection tank for discharging the separated oil phase; a vertical baffle is provided downstream of the oil collection tank, the height of which is lower than the minimum height of the oil collection tank, for preventing the oil phase from migrating to the downstream area; a water phase outlet is provided downstream of the baffle, and an anti-vortex device is installed at the water phase outlet to prevent the liquid phase from forming vortices during the discharge process and entraining the surrounding oil phase or gas phase.

[0013] In some embodiments of the present invention, the gas phase outlet is located at the top of the horizontal tank and downstream of the three-phase separation chamber. A demister is installed at the gas phase outlet to reduce the entrainment of liquid droplets in the gas phase under platform swaying conditions and improve the cleanliness of the discharged gas phase.

[0014] Another aspect of the present invention provides a separation method for an anti-sloshing oil-gas-water three-phase separator suitable for water treatment on deep-sea oil and gas platforms, comprising the following steps: S1. The fluid enters the inlet chamber from the oil-gas-water mixture inlet. After being diffused and homogenized by the porous guide plate, it enters the split chamber. Under the action of gravity and flow damping, the gas, oil and water are initially separated. Then, it enters the three-phase separation chamber uniformly through the upper part of the split plate. S2. The fluid entering the three-phase separation chamber is damped and homogenized by the porous medium stabilizing bed at the bottom. At the same time, the fluid flows through several vertical porous medium stabilizing modules in the mainstream direction, which weakens the transient flow velocity fluctuations of the liquid and gas phases, extends the separation path, and stabilizes the oil-water interface position. In addition, the first-stage, second-stage, and third-stage stabilizing baffles reduce the fluid fluctuations in different height ranges in stages, forming a sloshing suppression effect that gradually weakens from top to bottom in space. S3. After the three-phase separation is achieved, the floating oil phase is collected in the oil collection tank and then flows out from the oil phase outlet. The water phase that sinks after the baffle blocks part of the oil phase flows out from the water phase outlet, and the gas phase is discharged from the gas phase outlet after being treated by the demister.

[0015] Compared with the prior art, the present invention has the following outstanding advantages: 1. This invention achieves graded attenuation of incoming flow and homogenization of the flow field through the combination of porous guide plates and flow dividers, effectively reducing the impact of inlet disturbances on the three-phase separation process; through the synergistic effect of the porous medium stabilizing bed and the vertical porous medium stabilizing module, it significantly weakens the overall liquid swaying and transient velocity fluctuations caused by platform swaying, stabilizing the oil-water interface position; and through multi-stage stabilizing baffles set at different heights, it achieves zoned suppression of fluid fluctuations inside the three-phase separation chamber, improving the operational stability of the device under complex swaying conditions.

[0016] 2. The oil content in the effluent and the amount of liquid droplets entrained in the gas phase are significantly lower than those of traditional three-phase separators under typical sloshing conditions such as rolling, pitching, and heave. Especially under heave sloshing conditions, the multi-layer anti-sloshing oil-water separation plate forms an integral structure through modular stacking and fixed connection. While ensuring structural safety, it achieves coordinated control of residence time, flow damping and separation efficiency. While ensuring high separation efficiency, it effectively solves the three-phase separation problem under high sloshing conditions of deep-sea floating platforms. The structure is compact and occupies a small area, making up for the shortcomings of the prior art. Attached Figure Description

[0017] Figure 1 This is a front view of the anti-sloshing oil-gas-water three-phase separator structure described in this invention.

[0018] Figure 2 This is a schematic diagram of the multi-stage flow stabilizing baffle arrangement of the anti-sloshing oil-gas-water three-phase separator described in this invention.

[0019] Figure 3 This is a top view of the porous guide plate structure of the present invention.

[0020] Figure 4 This is a side view of the flow divider structure of the present invention.

[0021] Drawing number explanation: 1-Oil-gas-water mixture inlet, 2-Inlet chamber, 3-Diverter chamber, 4-Three-phase separation chamber, 5-Porous guide plate, 6-Diverter plate, 7-Porous medium stabilizing bed, 8-Vertical porous medium stabilizing module, 9-Oil collection tank, 10-Oil phase outlet, 11-Baffle, 12-Anti-vortex device, 13-Water phase outlet, 14-Demister, 15-Gas phase outlet, 16-First-stage stabilizing baffle, 17-Second-stage stabilizing baffle, 18-Third-stage stabilizing baffle, 19-Horizontal tank. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0023] mechanism: The oil-gas-water three-phase mixture first enters the inlet chamber at one end of the separator, where it is diffused and homogenized by a porous guide plate, reducing the instantaneous momentum of the incoming flow and weakening the impact of large-scale fluctuations on the downstream separation process. It then enters the diversion chamber, where, under the influence of gravity and pore damping, preliminary gas, oil, and water stratification occurs, and the mixture enters the three-phase separation chamber in a relatively uniform flow pattern. Once inside the three-phase separation chamber, a bottom porous medium stabilizing bed dampens and homogenizes the bottom liquid phase flow, effectively suppressing overall liquid sloshing and bottom backflow caused by platform sway. Under gravity, the fluid flows sequentially through several vertical porous medium stabilizing modules, further weakening transient velocity fluctuations in the liquid and gas phases, extending the separation path, and stabilizing the oil-water interface. Simultaneously, primary, secondary, and tertiary stabilizing baffles progressively reduce fluid fluctuations at different heights, creating a sloshing suppression effect that gradually weakens from top to bottom. Ultimately, the rising oil phase collects in the oil collection tank and flows out from the oil phase outlet. At this point, the baffle prevents the floating oil from migrating further downstream, while the sinking water phase flows out from the water phase outlet, and the gas phase is discharged from the gas phase outlet after being treated by the demister. This invention, through the synergistic effect of a porous flow guiding structure, a porous medium stabilizing bed, a vertical porous medium stabilizing module, and a staged stabilizing baffle, effectively weakens internal fluid fluctuations under complex operating conditions such as platform swaying, pitching, and heave, stabilizes the interface position of the oil, gas, and water phases, and achieves efficient and reliable separation of the three phases.

[0024] Example 1 1.1 An anti-sloshing oil-gas-water separator suitable for water treatment on deep-sea oil and gas platforms The anti-sloshing oil-gas-water separator applicable to water treatment of deep-sea oil and gas platforms in this embodiment is as follows: Figure 1As shown, the separator body is a horizontal tank 19, with an inlet chamber 2, a diversion chamber 3, and a three-phase separation chamber 4 arranged sequentially along the flow direction of the oil-gas-water mixture. The inlet chamber 2 is located directly below the diversion chamber 3, and the three-phase separation chamber 4 is located downstream of the diversion chamber 3. An oil-gas-water mixture inlet 1 is provided below one side wall of the horizontal tank 19 corresponding to the inlet chamber 2. A vertically arranged diversion plate 6 is arranged radially near the oil-gas-water mixture inlet 1 inside the horizontal tank 19, and a horizontally arranged porous guide plate 5 is arranged at its axial center. The porous guide plate 5 is connected to the diversion plate 6 and is used to divide the horizontal tank 19 into the inlet chamber 2, the diversion chamber 3, and the three-phase separation chamber 4.

[0025] Furthermore, the inlet chamber 2 is formed by a porous guide plate 5, the lower half of a flow divider 6, and a portion of the inner wall of the horizontal tank 19. The porous guide plate 5 has a uniformly perforated structure, such as... Figure 3 As shown, its opening ratio θ1 is 20% to 50%, and the aperture φ1 is 5mm to 15mm, which makes the flow velocity distribution of the mixture entering the separator more uniform and reduces the instantaneous momentum of the incoming flow; the lower half of the diverter plate 6 is a non-perforated structure, which is used to block the high momentum fluid from directly impacting the downstream area.

[0026] Furthermore, the diversion chamber 3 is formed by the porous guide plate 5, the upper part of the diversion plate 6, and a portion of the inner wall of the horizontal tank 19, combined with... Figure 4 As shown, the upper part of the diverter plate 6 has a uniform perforation structure with an opening ratio θ2 of 30% to 40% and a hole diameter φ2 of 8mm to 12mm.

[0027] Furthermore, the three-phase separation chamber 4 is formed by the flow divider plate 6 and another part of the inner wall of the horizontal tank 19. A porous medium stabilizing bed 7 is laid at the bottom. The porous medium stabilizing bed 7 is filled with porous medium particles with a particle size d of 8 mm to 12 mm. The height h of the porous medium stabilizing bed 7 is 5% to 15% of the diameter D of the horizontal tank 19. The overall porosity of the bed is 0.3 to 0.5. Inside the three-phase separation chamber 4, several vertically parallel porous media flow stabilizing modules 8 are arranged sequentially along the main flow direction of the mixture. The spacing L between these vertical porous media flow stabilizing modules 8 is equal to the length L of the horizontal tank 19. T The vertical porous medium flow stabilizing module 8 can be formed by internally filling porous medium particles or by weaving an integrated fiber material, with a thickness σ of 50mm to 100mm and an overall porosity of 0.2 to 0.5.

[0028] Combination Figure 2As shown, at different height positions in the three-phase separation chamber 4, a primary flow stabilizing baffle 16, a secondary flow stabilizing baffle 17, and a tertiary flow stabilizing baffle 18 are arranged transversely along the inner wall of the horizontal tank 19. The primary flow stabilizing baffle 16 is located in the upper region of the three-phase separation chamber 4, with its height from the bottom of the three-phase separator approximately 3 / 4 of the tank diameter D, and its width not exceeding 1 / 5 of the tank diameter D. The secondary flow stabilizing baffle 17 is located in the middle region of the three-phase separation chamber 4, with its height from the bottom of the three-phase separator approximately 1 / 2 of the tank diameter D, and its width not exceeding 1 / 4 of the tank diameter D. The tertiary flow stabilizing baffle 18 is located in the lower region of the three-phase separation chamber 4, with its height from the bottom of the three-phase separator approximately 1 / 4 of the tank diameter D, and its width not exceeding 1 / 5 of the tank diameter D.

[0029] Furthermore, an oil collection tank 9 is provided after the last vertical porous medium flow stabilization module 8; the height of the baffle on the side of the oil collection tank 9 closer to the incoming flow direction is lower than the height of the baffle on the side farther from the incoming flow direction, so as to facilitate the upward oil phase to collect into the oil collection tank 9 under sloshing conditions; an oil phase outlet 10 is provided at the bottom of the oil collection tank 9 for discharging the separated oil phase; a vertical baffle 11 is provided downstream of the oil collection tank 9, the height of which is lower than the lowest height of the oil collection tank 9, for preventing the oil phase from migrating to the downstream area; a water phase outlet 13 is provided downstream of the baffle 11, and an anti-vortex device 12 is installed at the water phase outlet 13 to prevent the liquid phase from forming vortices during the discharge process and entraining the surrounding oil phase or gas phase.

[0030] Furthermore, the gas phase outlet 15 is located at the top of the horizontal tank 19 and downstream of the three-phase separation chamber 4. A demister 14 is installed at the gas phase outlet 15 to reduce the entrainment of liquid droplets in the gas phase under platform swaying conditions and improve the cleanliness of the discharged gas phase.

[0031] 1.2 A separation method for an anti-sloshing oil-gas-water three-phase separator suitable for water treatment on deep-sea oil and gas platforms Combination Figure 1 Using the apparatus described in 1.1 above, the separation method of the anti-sloshing oil-gas-water three-phase separator includes the following steps: S1. The fluid enters the inlet chamber 2 from the oil-gas-water mixture inlet 1, and after being diffused and homogenized by the porous guide plate 5, it enters the diversion chamber 3. Under the action of gravity and flow damping, the gas, oil and water are initially separated into layers, and then enter the three-phase separation chamber 4 uniformly through the upper part of the diversion plate 6. S2. The fluid entering the three-phase separation chamber 4 has its bottom liquid phase damped and homogenized by the porous medium stabilizing bed 7. At the same time, the fluid flows sequentially through several vertical porous medium stabilizing modules 8 in the mainstream direction, which weakens the transient flow velocity fluctuations of the liquid and gas phases, extends the separation path, and stabilizes the oil-water interface position. In addition, the first-stage stabilizing baffle 16, the second-stage stabilizing baffle 17, and the third-stage stabilizing baffle 18 reduce the fluid fluctuations in different height ranges in stages, forming a sloshing suppression effect that gradually weakens from top to bottom in space. S3. After the three-phase separation is achieved, the floating oil phase is collected in the oil collection tank 9 and then flows out from the oil phase outlet 10. After the baffle 11 blocks part of the oil phase, the sinking water phase flows out from the water phase outlet 13. The gas phase is treated by the demister 14 and then discharged from the gas phase outlet 15.

[0032] Example 2 This embodiment uses the anti-sloshing oil-gas-water separator and separation method suitable for water treatment of deep-sea oil and gas platforms as described in Embodiment 1. The specific parameters of the separator are as follows: The diameter of the horizontal tank 19 is D=1.2 m, and the length of the horizontal tank is L. T It is 6.0 m; The porous guide plate 5 has an opening ratio θ1 of 20% and an opening diameter φ1 of 6 mm; the upper part of the diverter plate 6 has an opening ratio θ2 of 35% and an opening diameter φ2 of 10 mm; the porous medium stabilizing bed 7 at the bottom of the three-phase separation chamber 4 has a height h of 150 mm, and the bed is filled with spherical porous ceramic particles with a particle size d of 10±2 mm. The overall porosity of the porous medium stabilizing bed 7 is approximately 0.42. Four vertical porous medium flow stabilizing modules 8 are arranged along the main flow direction in the three-phase separation chamber 4, and the spacing L between adjacent flow stabilizing modules 8 is 400mm; the vertical porous medium flow stabilizing module 8 adopts an integrated fiber material woven structure with a thickness σ of 50mm and an overall porosity of about 0.50; preferably, the fiber material is polytetrafluoroethylene.

[0033] A primary flow stabilizer baffle 16, a secondary flow stabilizer baffle 17, and a tertiary flow stabilizer baffle 18 are respectively installed in the three-phase separation chamber 4. The primary flow stabilizer baffle 16 is 0.75D above the bottom of the tank and has a baffle width of 0.18D; the secondary flow stabilizer baffle 17 is 0.50D above the bottom of the tank and has a baffle width of 0.23D; and the tertiary flow stabilizer baffle 18 is 0.25D above the bottom of the tank and has a baffle width of 0.18D.

[0034] The height of the baffle plate on the side of the oil collection tank 9 closest to the incoming flow direction is 120 mm, and the height of the baffle plate on the side furthest from the incoming flow direction is 200 mm; the height of the baffle plate 11 installed downstream of the oil collection tank 9 is 100 mm.

[0035] Comparative Example 1 The device in this comparative example uses a traditional oil-gas-water three-phase separator. Its internal structure includes a single gravity settling space and a conventional corrugated plate oil removal structure. It does not have a porous guide plate, a porous medium stabilizing bed, a vertical porous medium stabilizing module, or a staged stabilizing baffle. Its external dimensions, effective volume, and inlet / outlet arrangement are consistent with those of Example 2.

[0036] Performance testing Under the same influent oil concentration (8000 mg / L), the same treated water volume, and the same sloshing conditions, the two oil-gas-water three-phase separators were compared and tested. Wave sensors were installed near the inlet and outlet of the equipment to test the degree of liquid sloshing at these locations. At the same time, the oil content of the effluent and the amount of liquid entrained in the gas phase were monitored at the water phase outlet and the gas phase outlet. The specific results are shown in Table 1.

[0037] Table 1 As can be seen from the data in Table 1, under steady-state conditions, the liquid sloshing amplitude of both implementation structures is very small, and the outlet oil content is similar. The performance of the implementation structure of the present invention is slightly better than that of the traditional three-phase separator. However, under simulated sloshing conditions such as horizontal rolling, vertical rolling, and heave, it can be found that the implementation structure of the present invention can achieve high oil removal efficiency, and the liquid sloshing amplitude is significantly smaller than that of the traditional three-phase separator. Especially under heave sloshing conditions, the separation effect of the traditional three-phase separator decreases significantly.

[0038] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present application in any way. Although the present application discloses the preferred embodiment as described above, it is not intended to limit the present application. Any changes or modifications made by those skilled in the art without departing from the scope of the technical solution of the present application using the disclosed technical content are equivalent to equivalent implementation cases. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the technical solution of the present invention are still within the scope of the technical solution.

Claims

1. An anti-sloshing oil-gas-water separator suitable for water treatment on deep-sea oil and gas platforms, characterized in that, The separator body is a horizontal tank, with an inlet chamber, a flow divider chamber, and a three-phase separation chamber arranged sequentially along the flow direction of the oil-gas-water mixture. An oil-gas-water mixture inlet is located on the lower side wall of the horizontal tank corresponding to the inlet chamber. Inside the horizontal tank, near the inlet, a vertically arranged flow divider plate is radially positioned, and a horizontally arranged perforated guide plate is positioned at its axial center. This perforated guide plate connects to the flow divider plate, dividing the horizontal tank into the inlet chamber, flow divider chamber, and three-phase separation chamber. The three-phase separation chamber is equipped with a porous medium flow stabilizing bed, a vertical porous medium flow stabilizing module, and a first-stage, second-stage, and third-stage flow stabilizing baffles, which together reduce the sloshing effect of the fluid.

2. The anti-sloshing oil-gas-water separator according to claim 1, characterized in that, The inlet chamber is formed by a porous guide plate, the lower half of a flow divider plate, and part of the inner wall of a horizontal tank. The porous guide plate has a uniform perforation structure with an opening ratio θ1 of 20% to 50% and a hole diameter φ1 of 5mm to 15mm.

3. The anti-sloshing oil-gas-water separator according to claim 1, characterized in that, The flow divider chamber is formed by a porous guide plate, the upper half of the flow divider plate, and part of the inner wall of the horizontal tank. The upper half of the flow divider plate has a uniform perforation structure with an opening ratio θ2 of 30% to 40% and a hole diameter φ2 of 8mm to 12mm.

4. The anti-sloshing oil-gas-water separator according to claim 1, characterized in that, The three-phase separation chamber is enclosed by a flow divider plate and another part of the inner wall of the horizontal tank, and a porous medium flow stabilizing bed is laid at its bottom; several vertical porous medium flow stabilizing modules are arranged in parallel to each other in the three-phase separation chamber along the main flow direction of the mixture.

5. The anti-sloshing oil-gas-water separator according to claim 1, characterized in that, The porous medium stabilizing bed is filled with porous medium particles with a particle size d of 8 mm to 12 mm. The height h of the porous medium stabilizing bed is 5% to 15% of the tank diameter D, and the overall porosity of the bed is 0.3 to 0.

5.

6. The anti-sloshing oil-gas-water separator according to claim 1, characterized in that, The spacing L between the vertical porous medium flow stabilization modules is equal to the tank length L. T The vertical porous medium flow stabilizing module can be formed by internally filling porous medium particles or by weaving an integrated fiber material, with a thickness σ of 50mm to 100mm and an overall porosity of 0.2 to 0.

5.

7. The anti-sloshing oil-gas-water separator according to claim 1, characterized in that, At different height positions in the three-phase separation chamber, a primary flow stabilizing baffle, a secondary flow stabilizing baffle, and a tertiary flow stabilizing baffle are arranged laterally along the inner wall of the horizontal tank. The primary flow stabilizing baffle, the secondary flow stabilizing baffle, and the tertiary flow stabilizing baffle are respectively located in the upper region, the middle region, and the lower region of the three-phase separation chamber.

8. The anti-sloshing oil-gas-water separator according to claim 1, characterized in that, An oil collection tank is provided after the last vertical porous medium flow stabilization module; the height of the baffle on the side of the oil collection tank closer to the incoming flow direction is lower than the height of the baffle on the side farther from the incoming flow direction; an oil phase outlet is provided at the bottom of the oil collection tank; a vertical baffle is provided downstream of the oil collection tank, and the height of the baffle is lower than the minimum height of the oil collection tank; a water phase outlet is provided downstream of the baffle, and an anti-vortex device is installed at the water phase outlet.

9. The anti-sloshing oil-gas-water separator according to claim 1, characterized in that, The gas phase outlet is located at the top of the horizontal tank and downstream of the three-phase separation chamber, and a demister is installed at the gas phase outlet.

10. A separation method using an anti-sloshing oil-gas-water three-phase separator suitable for water treatment on deep-sea oil and gas platforms, employing the anti-sloshing oil-gas-water separator as described in any one of claims 8-9, comprising the following steps: S1. The fluid enters the inlet chamber from the oil-gas-water mixture inlet. After being diffused and homogenized by the porous guide plate, it enters the split chamber. Under the action of gravity and flow damping, the gas, oil and water are initially separated. Then, it enters the three-phase separation chamber uniformly through the upper part of the split plate. S2. The fluid entering the three-phase separation chamber is damped and homogenized by the porous medium stabilizing bed at the bottom. At the same time, the fluid flows through several vertical porous medium stabilizing modules in the mainstream direction, which weakens the transient flow velocity fluctuations of the liquid and gas phases, extends the separation path, and stabilizes the oil-water interface position. In addition, the first-stage, second-stage, and third-stage stabilizing baffles reduce the fluid fluctuations in different height ranges in stages, forming a sloshing suppression effect that gradually weakens from top to bottom in space. S3. After the three-phase separation is achieved, the floating oil phase is collected in the oil collection tank and then flows out from the oil phase outlet. The water phase that sinks after the baffle blocks part of the oil phase flows out from the water phase outlet, and the gas phase is discharged from the gas phase outlet after being treated by the demister.

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