A vertical multi-stage oil and gas mixed transport pump housing integration device for deep-sea oil wellheads

Abstract

This invention discloses an integrated housing device for a vertical multi-stage oil and gas mixed-transfer pump used in deep-sea production trees, belonging to the technical field of deep-sea oil and gas extraction equipment. This integrated housing device includes an outer shell, with a pretreatment mechanism installed at the bottom of the inner side of the shell to uniformly disperse gas and liquid clumps. A drive mechanism is installed at the top of the inner side of the shell, and a multi-stage pressurization mechanism is installed at the center of the inner side of the shell. The drive mechanism provides power to the multi-stage pressurization mechanism, enabling the fluid to obtain high-speed power. This invention, by designing the outer shell, inlet flange, and outlet flange as an integrated structure, fundamentally eliminates the transition connection section between the mixed-transfer pump and the production tree, significantly shortening the overall axial dimension, reducing the number of sealing interfaces, and simplifying the underwater installation process.

Description

Technical Field

[0001] This invention belongs to the technical field of deep-sea oil and gas extraction equipment, specifically relating to an integrated device for the housing of a vertical multi-stage oil and gas mixed transport pump used in deep-sea wellheads. Background Technology

[0002] Subsea wellheads are key production equipment in offshore oil and gas fields, undertaking multiple tasks such as controlling oil and gas flow and isolating the wellhead from the external environment. In deep-sea oil and gas extraction, the multiphase mixture of crude oil, natural gas, and water extracted from the wellhead needs to be pressurized before being transported to surface platforms or onshore terminals. Oil-gas mixed-transfer pumps, as core equipment for realizing advanced gas-liquid mixed-transfer processes, possess the dual characteristics of pumps and compressors, making them one of the key pieces of equipment for deep-sea oil and gas development. Currently, the most researched oil-gas mixed-transfer pumps can be classified into rotary-powered multiphase pumps and positive displacement multiphase pumps based on their working principles. Rotary-powered multiphase pumps include multistage axial-flow mixed-transfer pumps and multistage centrifugal mixed-transfer pumps, while the latter includes twin-screw pumps, diaphragm pumps, linear piston pumps, and rotor multiphase pumps. Helical axial-flow multiphase pumps have become one of the optimal choices for subsea multiphase pressurization and transportation due to their advantages such as adaptability to large-volume flow rates, compact structure, insensitivity to solid particles, and certain resistance to dry running. Vertically arranged multiphase pumps have unique advantages in deep-sea conditions because they can make full use of gravity, improve gas-liquid separation, and save seabed space.

[0003] Traditional subsea production systems typically employ a split-type design for the mixed-transfer pump, with the pump casing connected to the subsea production tree via independent flanges and multiple bolts. However, this structure results in excessive axial length: the split design requires intermediate components such as transition flanges and connecting stubs to connect the pump and the production tree, significantly increasing the overall axial dimension. For deepwater installation, this large size not only increases installation difficulty but also makes the system more susceptible to harsh environmental factors such as currents and waves, affecting the safety of the production tree's deployment and alignment with the wellhead; installation efficiency is low: deepwater production trees can weigh tens of tons, and the complex deployment process increases the number of underwater installation steps and the difficulty of docking; reliability issues with connectors: the split connection requires a large number of bolts, limiting installation space, and corrosion of bolts can cause significant inconvenience for subsequent disassembly and maintenance; multiple sealing points: multi-stage flange connections mean multiple sealing interfaces, increasing the risk of leakage. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an integrated device for the housing of a vertical multi-stage oil and gas mixed transport pump for deep-sea production trees.

[0005] The technical solution adopted to solve the above technical problems is: a vertical multi-stage oil and gas mixed transport pump housing integration device for deep-sea oil production trees, including an outer shell, and a pretreatment mechanism installed at the bottom of the inner part of the outer shell, which uniformly disperses the gas and liquid clumps. A drive mechanism is installed at the top of the inner part of the housing, and a multi-stage pressurization mechanism is installed at the center of the inner part of the housing. The drive mechanism provides power to the multi-stage pressurization mechanism, which enables the fluid to obtain high-speed power.

[0006] Furthermore, an inlet flange is fixedly connected to the bottom center of the outer shell, a flow guide seat is fixedly connected to the bottom of the inner wall of the outer shell, and an outlet flange is fixedly connected to the top center of the outer shell. The outer shell, the inlet flange, and the outlet flange are designed as an integrated structure.

[0007] With the above technical solution, the entire device is connected to the wellhead of the Christmas tree directly through the inlet flange. The fluid inside the Christmas tree enters the outer shell through the inlet flange and the guide seat, which facilitates the subsequent pretreatment mechanism and multi-stage pressurization mechanism to deliver it. The outer shell, inlet flange and outlet flange are designed as an integrated structure, which fundamentally eliminates the transition connection section between the mixed pump and the Christmas tree, significantly shortens the axial dimension of the whole machine, reduces the sealing interface, and simplifies the underwater installation process.

[0008] Furthermore, an ROV operation panel is fixedly installed on the outer wall of the housing.

[0009] The above technical solution includes monitoring components such as pressure sensors, temperature sensors, and flow meters, as well as an ROV operation panel for underwater robot operation. The ROV operation panel is equipped with hydraulic and electrical interfaces, which facilitates the underwater robot to perform valve opening and closing control, parameter reading, and other operations.

[0010] Furthermore, the pretreatment mechanism includes a mesh plate fixedly connected to the bottom of the inner wall of the outer shell, a porous mixing sleeve fixedly connected to the bottom of the mesh plate, and a guide cone fixedly connected to the center of the bottom of the mesh plate.

[0011] With the above technical solution, when the fluid enters the shell through the inlet flange, it first passes through the guide cone, which disperses the chaotic fluid around the guide cone, making the fluid flow evenly towards the porous mixing sleeve, then towards the mesh plate, and finally towards the multi-stage pressurization mechanism through the mesh plate. When the fluid passes through the porous mixing sleeve and the mesh plate, the unstable fluid at the wellhead is dispersed through multiple holes and becomes a uniform and stable fluid, creating good inlet conditions for subsequent pressurization.

[0012] Furthermore, the flow guide cone is located at the center inside the porous mixing sleeve, and the bottom end of the porous mixing sleeve is in contact with the top of the flow guide seat.

[0013] The above technical solution facilitates the rapid passage of fluid through the porous mixing sleeve, thereby mixing and dispersing it.

[0014] Furthermore, the driving mechanism includes a mounting plate fixedly connected to the top of the inner wall of the housing. A through hole is provided on the outer side of the top of the mounting plate. A mounting shell is fixedly connected to the top of the mounting plate. A drive motor is fixedly installed inside the mounting shell at the top center of the mounting plate. A cooling groove is provided on the inner wall of the mounting shell. Multiple heat sinks are fixedly connected to the outer wall of the mounting shell. A rotating shaft is rotatably connected between the mounting plate and the mesh plate.

[0015] With the above technical solution, when the fluid is pressurized and extracted, the drive motor is started, and the output shaft rotates to drive the rotating shaft, thereby driving the multi-stage pressurization mechanism to rotate, thus realizing the extraction of fluid. The extracted fluid flows outward through the outlet flange. When the fluid passes through multiple through holes, it passes through multiple heat sinks and is then sprayed outward through the outlet flange, realizing the delivery of fluid. Since the entire equipment is installed on the seabed, the temperature of the seawater is low, and the seawater is in direct contact with the outer wall of the shell, while the fluid is in direct contact with the inner wall of the shell. This allows the seawater to cool the extracted fluid through the shell, thereby sharing the temperature of the equipment inside the shell.

[0016] Furthermore, the cooling tank is filled with coolant, and the bottom end of the drive motor output shaft is fixedly connected to the top end of the rotating shaft.

[0017] With the above technical solution, the drive motor generates internal temperature during operation, and the heat is transferred to the mounting housing. At this time, the cooling tank contains coolant, which cools the mounting housing and dissipates heat from the drive motor, thereby improving the service life of the drive motor.

[0018] Furthermore, the multi-stage pressurization mechanism includes multiple axial flow impellers fixedly connected to the outer wall of the rotating shaft, a multi-bladed guide sleeve fixedly connected to the inner wall of the outer shell, an impeller shell fixedly connected to the outer wall of the rotating shaft, a centrifugal impeller fixedly connected to the outer wall of the rotating shaft, a diffuser fixedly connected to the outer wall of the rotating shaft, multiple diffusion ports on the diffuser, and multiple water outlets at the top center of the impeller shell.

[0019] Through the above technical solution, when the fluid passes through the mesh plate, the rotating shaft drives multiple axial flow impellers to rotate. The multiple axial flow impellers sequentially pressurize and extract the fluid, thereby extracting the fluid. When the fluid passes through the multi-blade guide sleeve, the multi-blade guide sleeve straightens the rotating fluid, making it easier for the subsequent centrifugal impeller to extract and pressurize it. After the fluid is straightened by the multi-blade guide sleeve, the centrifugal impeller rotates at high speed, thereby throwing the fluid from the center to the edge, increasing the fluid speed and pressure. The fluid flows to the back of the diffuser through multiple diffuser ports and is finally sprayed upward through multiple outlets, thereby efficiently extracting oil and gas from the wellhead.

[0020] Furthermore, all of the axial flow impellers are located inside the multi-blade guide sleeve.

[0021] Through the above technical solution, multiple axial flow impellers are responsible for rotating the fluid at high speed and driving the fluid to move. Since the fluid forms vortices after passing through the axial flow impellers, the multi-bladed guide sleeve is responsible for straightening the vortex fluid, which facilitates subsequent pressurization. It is also integrated with the pretreatment mechanism in the same housing along the vertical direction. The outlet of the pretreatment mechanism is directly connected to the inlet of the multi-stage pressurization mechanism without the need for intermediate pipeline transition. This vertically integrated arrangement makes full use of the spatial advantages of the vertical structure, making the fluid flow path shorter and smoother.

[0022] Furthermore, the diffuser and the centrifugal impeller are located inside the impeller housing, with the diffuser positioned above the centrifugal impeller.

[0023] Through the above technical solution, the centrifugal impeller generates a strong centrifugal force when it rotates at high speed, which throws the fluid from the center to the edge. In this process, the fluid speed and pressure increase sharply. The diffuser further converts the speed of the high-speed fluid thrown out by the centrifugal impeller into pressure, and finally outputs high-pressure fluid that meets the pipeline transportation requirements.

[0024] The beneficial effects of the present invention are as follows: (1) The present invention, by designing the outer shell, inlet flange and outlet flange, and the outer shell, inlet flange and outlet flange are integrated into a single structure, fundamentally eliminates the transition connection section between the mixed pump and the tree, significantly shortens the axial dimension of the whole machine, reduces the sealing interface, and simplifies the underwater installation process; (2) The present invention, by designing the ROV operation panel, includes monitoring elements such as pressure sensors, temperature sensors, and flow meters, as well as the ROV operation panel for underwater robot operation, and the ROV operation panel is equipped with hydraulic interface and electrical control interface, which facilitates the underwater robot to perform valve opening and closing control, parameter reading and other operations; (3) The present invention, by designing the pretreatment mechanism and multi-stage pressurization mechanism, the pretreatment mechanism will pressurize the wellhead Unstable fluid is dispersed through multiple holes and becomes a uniform and stable fluid, creating good inlet conditions for subsequent pressurization. The multi-stage pressurization mechanism pressurizes and extracts the fluid in sequence and is integrated with the pretreatment mechanism in the same housing along the vertical direction. The outlet of the pretreatment mechanism is directly connected to the inlet of the multi-stage pressurization mechanism without the need for intermediate pipeline transition. This vertical integration arrangement makes full use of the spatial advantages of the vertical structure, making the fluid flow path shorter and smoother. (4) This invention designs a drive mechanism and provides coolant inside the drive mechanism, so that when the drive motor is working, the internal temperature is generated and the heat is transferred to the mounting housing. The mounting housing transfers the temperature to the coolant, so that the coolant cools the mounting housing, thereby dissipating heat from the drive motor and improving the service life of the drive motor. Attached Figure Description

[0025] Figure 1 This is an overall appearance drawing of the present invention; Figure 2 This is the front view of the present invention; Figure 3 This is an overall sectional view of the present invention; Figure 4 This is a cross-sectional view of the outer casing of the present invention; Figure 5 This is a schematic diagram of the multi-stage booster mechanism multi-blade guide sleeve structure of the present invention; Figure 6 This is a schematic diagram of the overall internal structure of the present invention; Figure 7 This is an unfolded view of some parts of the multi-stage booster mechanism of the present invention; Figure 8 This is a schematic diagram of the diffuser structure of the multi-stage pressurization mechanism of the present invention; Figure 9 for Figure 3 A magnified view of a portion of point A in the middle.

[0026] Reference numerals: 1. Outer shell; 11. Inlet flange; 12. Flow guide seat; 13. Outlet flange; 14. ROV operation panel; 2. Pretreatment mechanism; 201. Mesh plate; 202. Perforated mixing sleeve; 203. Flow guide cone; 3. Drive mechanism; 301. Mounting plate; 302. Through hole; 303. Mounting shell; 304. Drive motor; 305. Cooling tank; 306. Heat sink; 307. Rotating shaft; 4. Multi-stage pressurization mechanism; 401. Axial flow impeller; 402. Multi-blade flow guide sleeve; 403. Impeller shell; 404. Centrifugal impeller; 405. Diffuser; 406. Diffuser port; 407. Outlet. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0028] like Figures 1-4As shown in this embodiment, a vertical multi-stage oil and gas mixed-transfer pump housing integration device for deep-sea production trees includes a housing 1. An inlet flange 11 is fixedly connected to the bottom center of the housing 1, a flow guide seat 12 is fixedly connected to the bottom of the inner wall of the housing 1, and an outlet flange 13 is fixedly connected to the top center of the housing 1. The housing 1, the inlet flange 11, and the outlet flange 13 are designed as an integrated structure. The entire device is directly connected to the wellhead of the production tree via the inlet flange 11. The fluid inside the production tree enters the housing 1 through the inlet flange 11 and the flow guide seat 12, facilitating the subsequent pretreatment mechanism 2 and multi-stage pressurization mechanism 4 to deliver it. The outer shell 1, inlet flange 11, and outlet flange 13 are designed as a single integrated structure, which fundamentally eliminates the transition connection section between the mixed pump and the Christmas tree, significantly shortens the overall axial dimension, reduces the number of sealing interfaces, and simplifies the underwater installation process. The outer wall of the outer shell 1 is fixedly installed with the ROV operation panel 14, which includes monitoring elements such as pressure sensors, temperature sensors, and flow meters, as well as the ROV operation panel 14 for underwater robot operation. The ROV operation panel 14 is equipped with hydraulic and electrical interfaces, which facilitates the underwater robot to perform valve opening and closing control, parameter reading, and other operations.

[0029] like Figures 1-4 As shown, a pretreatment mechanism 2 is installed at the bottom of the inner wall of the outer casing 1. The pretreatment mechanism 2 evenly disperses the gas and liquid clumps. The pretreatment mechanism 2 includes a mesh plate 201 fixedly connected to the bottom of the inner wall of the outer casing 1. A porous mixing sleeve 202 is fixedly connected to the bottom of the mesh plate 201. A guide cone 203 is fixedly connected to the center of the bottom of the mesh plate 201. When the fluid enters the outer casing 1 through the inlet flange 11, it first passes through the guide cone 203, thereby dispersing the chaotic fluid around the guide cone 203, so that the fluid flows evenly into the porous mixing sleeve 202. 2. The fluid flows towards the mesh plate 201 and then towards the multi-stage pressurization mechanism 4 through the mesh plate 201. When the fluid passes through the porous mixing sleeve 202 and the mesh plate 201, the unstable fluid at the wellhead is dispersed through multiple holes and becomes a uniform and stable fluid, creating good inlet conditions for subsequent pressurization. The guide cone 203 is located in the center inside the porous mixing sleeve 202. The bottom end of the porous mixing sleeve 202 is in contact with the top of the guide seat 12, which facilitates the rapid passage of the fluid through the porous mixing sleeve 202, thereby mixing and dispersing it.

[0030] like Figures 1-9As shown, a drive mechanism 3 is installed at the top of the inner wall of the outer casing 1. The drive mechanism 3 includes a mounting plate 301 fixedly connected to the top of the inner wall of the outer casing 1. A through hole 302 is provided on the outer side of the top of the mounting plate 301. A mounting shell 303 is fixedly connected to the top of the mounting plate 301. A drive motor 304 is fixedly installed inside the mounting shell 303 at the center of the top of the mounting plate 301. A cooling groove 305 is provided on the inner wall of the mounting shell 303. Multiple heat sinks 306 are fixedly connected to the outer wall of the mounting shell 303. A rotating shaft 307 is rotatably connected between the mounting plate 301 and the mesh plate 201. When the fluid is pressurized and extracted, the drive motor 304 is started, and the output shaft rotates to drive the rotating shaft 307 to rotate, thereby driving the multi-stage pressurization mechanism 4 to rotate, thus realizing the extraction of fluid. The extracted fluid flows outward through the outlet flange 13. When the fluid passes through multiple through holes 302, it passes through multiple heat sinks 306, and then is ejected outward through the outlet flange 13, thus realizing the delivery of the fluid. Since the entire device is installed on the seabed, the temperature of the seawater is low, and the seawater is in direct contact with the outer wall of the outer shell 1, while the fluid is in direct contact with the inner wall of the outer shell 1. This allows the seawater to cool the extracted fluid through the outer shell 1, thereby sharing the temperature of the device inside the outer shell 1. The cooling tank 305 is filled with coolant. The bottom end of the output shaft of the drive motor 304 is fixedly connected to the top end of the rotating shaft 307. When the drive motor 304 is working, it generates internal temperature, which is transferred to the mounting shell 303. At this time, the coolant in the cooling tank 305 cools the mounting shell 303, thereby dissipating heat from the drive motor 304 and improving the service life of the drive motor 304.

[0031] like Figures 1-8As shown, a multi-stage pressurization mechanism 4 is installed at the center of the inner casing 1. The drive mechanism 3 provides power to the multi-stage pressurization mechanism 4, which enables the fluid to obtain high-speed power. The multi-stage pressurization mechanism 4 includes multiple axial flow impellers 401 fixedly connected to the outer wall of the rotating shaft 307. A multi-bladed guide sleeve 402 is fixedly connected to the inner wall of the casing 1. An impeller housing 403 is fixedly connected to the outer wall of the rotating shaft 307. A centrifugal impeller 404 is fixedly connected to the outer wall of the rotating shaft 307. A diffuser 405 is fixedly connected to the outer wall of the rotating shaft 307. The diffuser 405 has multiple diffusion ports 406. Multiple outlets 407 are provided at the top center of 03. When fluid passes through the mesh plate 201, the rotating shaft 307 rotates, driving multiple axial flow impellers 401 to rotate. The multiple axial flow impellers 401 sequentially pressurize and extract the fluid, thereby drawing out the fluid. When the fluid passes through the multi-blade guide sleeve 402, the multi-blade guide sleeve 402 straightens the rotating fluid, facilitating subsequent extraction and pressurization by the centrifugal impeller 404. After the fluid is straightened by the multi-blade guide sleeve 402, the centrifugal impeller 404 rotates at high speed, thereby throwing the fluid from the center to the edge, increasing the fluid speed and pressure, and passing through multiple diffuser ports 406. The fluid flows towards the back of the diffuser 405 and is eventually ejected upwards through multiple outlets 407, thereby efficiently extracting oil and gas from the wellhead. Multiple axial flow impellers 401 are located inside the multi-bladed guide sleeve 402. These impellers rotate the fluid at high speed, propelling it forward. Since the fluid forms vortices after passing through the impellers 401, the multi-bladed guide sleeve 402 straightens these vortices for subsequent pressurization. It is also integrated vertically with the pretreatment mechanism 2 within the same housing. The outlet of the pretreatment mechanism 2 is directly connected to the inlet of the multi-stage pressurization mechanism 4. Without the need for intermediate pipeline transitions, this vertically integrated arrangement fully utilizes the spatial advantages of the vertical structure, making the fluid flow path shorter and smoother. The diffuser 405 and centrifugal impeller 404 are located inside the impeller housing 403, with the diffuser 405 positioned above the centrifugal impeller 404. When the centrifugal impeller 404 rotates at high speed, it generates a strong centrifugal force, throwing the fluid from the center to the edge. During this process, the fluid velocity and pressure increase dramatically. The diffuser 405 further converts the velocity of the high-speed fluid thrown out by the centrifugal impeller 404 into pressure, ultimately outputting high-pressure fluid that meets the requirements of pipeline transportation.

[0032] The working principle of this embodiment is as follows: the outer shell 1, inlet flange 11, and outlet flange 13 are designed as an integrated structure, fundamentally eliminating the transition connection section between the mixed pump and the Christmas tree, significantly shortening the overall axial dimension, reducing the sealing interface, and simplifying the underwater installation process. The entire device is connected to the wellhead connection end directly to the Christmas tree via the inlet flange 11. When pumping fluid from inside the Christmas tree, the drive motor 304 is started, and the output shaft rotates to drive the rotating shaft 307 to rotate. The rotation of the rotating shaft 307 drives multiple axial flow impellers. 401 rotates to extract fluid, allowing the fluid to enter the outer casing 1 through the inlet flange 11 and the guide seat 12. The fluid first passes through the guide cone 203, which disperses the chaotic fluid around the guide cone 203, making the fluid flow evenly towards the porous mixing sleeve 202, then towards the mesh plate 201, and finally towards the multi-stage booster mechanism 4 through the mesh plate 201. When the fluid passes through the porous mixing sleeve 202 and the mesh plate 201, the unstable fluid at the wellhead is dispersed through multiple holes and becomes a uniform and stable fluid. When the fluid passes through the mesh plate 201, multiple axial flow impellers 401 continue to rotate, thereby sequentially pressurizing and extracting the fluid. When the fluid passes through the multi-blade guide sleeve 402, the rotating fluid is straightened, making it easier for the subsequent centrifugal impeller 404 to extract and pressurize it. After the fluid is straightened by the multi-blade guide sleeve 402, the centrifugal impeller 404 rotates at high speed, thereby throwing the fluid from the center to the edge, increasing the fluid speed and pressure. The fluid flows to the back of the diffuser 405 through multiple diffuser ports 406, and finally sprays upward through multiple outlet ports 407. When the fluid passes through multiple through holes 302, it passes through multiple heat sinks 306, and then sprays outward through the outlet flange 13, realizing the delivery of the fluid. At the same time, the multi-stage pressurization mechanism 4 and the pretreatment mechanism 2 are integrated in the same housing in the vertical direction. The outlet of the pretreatment mechanism 2 is directly connected to the inlet of the multi-stage pressurization mechanism 4 without the need for intermediate pipeline transition. This vertical integration arrangement makes full use of the spatial advantages of the vertical structure, making the fluid flow path shorter and smoother. When the drive motor 304 is working, it generates internal temperature, which is transferred to the mounting shell 303. At this time, the cooling tank 305 contains coolant, which cools the mounting shell 303 and dissipates heat from the drive motor 304, thus improving the service life of the drive motor 304. Since the entire device is installed on the seabed, the temperature of the seawater is low, and the seawater is in direct contact with the outer wall of the shell 1, while the fluid is in direct contact with the inner wall of the shell 1. This allows the seawater to cool the extracted fluid through the shell 1, thereby sharing the temperature of the device inside the shell 1.

[0033] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

1. A vertical multi-stage oil and gas mixed-transfer pump housing integration device for deep-sea production trees, comprising a housing (1), characterized in that: A pretreatment mechanism (2) is installed at the bottom of the inner side of the outer shell (1), which disperses the gas and liquid masses evenly. A drive mechanism (3) is installed at the top of the inner part of the outer shell (1). A multi-stage pressurization mechanism (4) is installed at the center of the inner part of the outer shell (1). The multi-stage pressurization mechanism (4) includes multiple axial flow impellers (401) fixedly connected to the outer wall of the rotating shaft (307). A multi-bladed guide sleeve (402) is fixedly connected to the inner wall of the outer shell (1). An impeller shell (403) is fixedly connected to the outer wall of the rotating shaft (307). A centrifugal impeller (404) is fixedly connected to the outer wall of the rotating shaft (307). A diffuser (405) is fixedly connected to the outer wall of the rotating shaft (307). Multiple diffuser ports (406) are opened on the diffuser (405). Multiple water outlets (407) are opened at the top center of the impeller shell (403). The drive mechanism (3) provides power to the multi-stage pressurization mechanism (4). The multi-stage pressurization mechanism (4) enables the fluid to obtain high-speed power.

2. The vertical multi-stage oil and gas mixed-transfer pump housing integration device for deep-sea production trees according to claim 1, characterized in that, An inlet flange (11) is fixedly connected to the bottom center of the outer shell (1), a flow guide seat (12) is fixedly connected to the bottom of the inner wall of the outer shell (1), and an outlet flange (13) is fixedly connected to the top center of the outer shell (1). The outer shell (1), the inlet flange (11), and the outlet flange (13) are designed as an integrated structure.

3. The vertical multi-stage oil and gas mixed-transfer pump housing integration device for deep-sea production trees according to claim 2, characterized in that, The outer wall of the housing (1) is fixedly installed with an ROV operation panel (14).

4. The vertical multi-stage oil and gas mixed-transfer pump housing integration device for deep-sea production trees according to claim 2, characterized in that, The pretreatment mechanism (2) includes a mesh plate (201) fixedly connected to the bottom of the inner wall of the outer shell (1), a perforated mixing sleeve (202) fixedly connected to the bottom of the mesh plate (201), and a guide cone (203) fixedly connected to the bottom center of the mesh plate (201).

5. The vertical multi-stage oil and gas mixed-transfer pump housing integration device for deep-sea production trees according to claim 4, characterized in that, The guide cone (203) is located at the center inside the porous mixing sleeve (202), and the bottom end of the porous mixing sleeve (202) is in contact with the top of the guide seat (12).

6. The vertical multi-stage oil and gas mixed-transfer pump housing integration device for deep-sea production trees according to claim 4, characterized in that, The drive mechanism (3) includes a mounting plate (301) fixedly connected to the top of the inner wall of the outer shell (1). A through hole (302) is provided on the outer side of the top of the mounting plate (301). A mounting shell (303) is fixedly connected to the top of the mounting plate (301). A drive motor (304) is fixedly installed inside the mounting shell (303) at the top center of the mounting plate (301). A cooling groove (305) is provided on the inner wall of the mounting shell (303). A plurality of heat sinks (306) are fixedly connected to the outer wall of the mounting shell (303). A rotating shaft (307) is rotatably connected between the mounting plate (301) and the mesh plate (201).

7. The vertical multi-stage oil and gas mixed-transfer pump housing integration device for deep-sea production trees according to claim 6, characterized in that, The cooling tank (305) is filled with coolant, and the bottom end of the output shaft of the drive motor (304) is fixedly connected to the top end of the rotating shaft (307).

8. The vertical multi-stage oil and gas mixed-transfer pump housing integration device for deep-sea production trees according to claim 1, characterized in that, Multiple axial flow impellers (401) are located inside the multi-bladed guide sleeve (402).

9. The vertical multi-stage oil and gas mixed-transfer pump housing integration device for deep-sea production trees according to claim 1, characterized in that, The diffuser (405) and the centrifugal impeller (404) are located inside the impeller housing (403), with the diffuser (405) located above the centrifugal impeller (404).

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