Model 3000 electric cementing truck

Abstract

The application discloses a 3000-type electric well cementing vehicle, which is highly integrated with a hydraulic system, a whole-machine power supply and distribution system, a main motor set, a reduction gearbox, a control system, an operation platform, a plunger pump, a large-displacement slurry mixing system, a slurry mixing tank, a metering tank, a jet centrifugal pump assembly, a circulating centrifugal pump assembly, a perfusion centrifugal pump assembly, a high-pressure manifold and a low-pressure manifold on a chassis vehicle. The chassis vehicle is started only during equipment driving, and the upper parts of the chassis vehicle are powered by the whole-machine power supply and distribution system and controlled by the control system during well cementing construction operation. Compared with a single diesel engine driving system, the main motor set with multiple motors has a 73% weight reduction and an 88% space reduction, and the maximum output power of the whole machine is increased to 3000 hp, so that the problem that the output power of a single diesel engine driving electric well cementing vehicle cannot break through 2500 hp is solved, the maximum working pressure of the whole machine is 83 MPa, the maximum clean water working displacement is 3.1 m³ / min, and a single equipment can simultaneously meet the requirements of road moving and transporting, conventional well cementing construction and well cementing construction of a 10000 m deep well.

Description

Technical Field

[0001] This invention relates to the field of oil and gas field development technology. More specifically, this invention relates to a 3000-type electric cementing truck. Background Technology

[0002] Cementing equipment is a core specialized piece of equipment in oilfield drilling engineering, primarily used for cementing operations in oil and gas wells. It injects cement slurry into the wellbore and casing annulus to achieve key functions such as sealing the wellbore, isolating the formation, and supporting the casing. Meanwhile, onshore cementing operations are characterized by short timeframes and frequent site relocation, leading to the predominance of truck-mounted cementing equipment. As national oil and gas field development advances towards 10,000-meter deep wells, drilling depths and horizontal section lengths are continuously increasing, significantly raising the pressure, flow rate, and load of cementing operations, placing higher demands on equipment performance. Current exploration and development of 10,000-meter deep wells are characterized by high pressure (≥70MPa) and large flow rate (≥2m³ / min), with some well sections exceeding 2500hp in operating power. However, in the current domestic and international petroleum equipment field, the maximum output power of single-unit diesel-powered cementing trucks and single-unit electric cementing trucks is 2500HP, meaning conventional cementing equipment performance can no longer meet the needs of 10,000-meter cementing processes. Limited by chassis layout space and load capacity, the output power of single-unit diesel-powered cementing trucks and single-unit electric cementing trucks can no longer be improved. Summary of the Invention

[0003] One object of the present invention is to solve at least the above-mentioned problems and to provide at least the advantages that will be described later.

[0004] Another objective of this invention is to provide a 3000-type electric cementing truck to solve the technical problem that existing cementing trucks cannot simultaneously meet the requirements of high power output and vehicle-mounted operation.

[0005] To achieve these objectives and other advantages according to the present invention, a 3000-type electric cementing truck is provided, comprising: 1. a chassis, on which a control system is mounted and, from front to back, a hydraulic system, a power supply and distribution system, a main motor unit, a gearbox, a plunger pump, a large-displacement slurry mixing system, a slurry tank, a metering tank, a jet centrifugal pump assembly, a circulating centrifugal pump assembly, and an injection centrifugal pump assembly are sequentially mounted and communicated with the control system; the chassis unit is also equipped with a high-pressure manifold and a low-pressure manifold, and the valves on the high-pressure manifold and the low-pressure manifold are communicated with the control system; the power supply and distribution system supplies power to the main motor unit and other components of the machine. The metering tank, the jet centrifugal pump assembly, the large-volume mixing system, and the mixing tank are connected in sequence through a low-pressure manifold. The jet centrifugal pump assembly draws in the liquid from the metering tank, pressurizes it, and sprays it into the large-volume mixing system. The liquid is mixed with the cement ash in the large-volume mixing system to form cement slurry. The mixing tank is used to stir and mix the cement ash. The circulating centrifugal pump assembly is used for cement slurry in the circulating mixing tank and the large-displacement mixing system. The injection centrifugal pump assembly is used to draw cement slurry from the mixing tank, pressurize it and pump it into the plunger pump through the low-pressure manifold. The outlet of the plunger pump is connected to the high-pressure manifold, and the high-pressure manifold is connected to the wellhead manifold. The cement slurry is transported to the bottom of the well through the high-pressure manifold to complete the cementing operation. The main motor unit, gearbox, and plunger pump together form the pumping system. The main motor unit includes multiple small motor units, each of which is formed by multiple permanent magnet synchronous motors mechanically connected in series end to end. The rotors of multiple permanent magnet synchronous motors are coupled through a rigid connecting shaft so that the electromagnetic torque is superimposed to drive the same load. The center of gravity of the pumping system is located at the center of the plunger pump. The permanent magnet synchronous motors are evenly distributed on both sides of the center of gravity of the pumping system. The main motor unit outputs power to the plunger pump through a direct-insertion gearbox. The displacement of the plunger pump is adjusted by adjusting the speed of the main motor unit through the control system.

[0006] Preferably, the high-volume slurry mixing system is equipped with a high-energy mixer and a densitometer. The circulating centrifugal pump assembly draws cement slurry from the slurry tank, pressurizes it, and most of the cement slurry enters the high-energy mixer for circulating mixing. A small portion of the cement slurry flows through the densitometer and returns to the slurry tank.

[0007] Preferably, it also includes a lubrication system, which comprises a plunger pump power end lubrication system and a hydraulic end lubrication system. The plunger pump power end lubrication system includes a power end lubrication pump, a lubricating oil pump motor, a power end lubricating oil tank, and a power end lubrication radiator, used to provide lubrication and heat dissipation for the power end of the plunger pump. The power end lubrication radiator is located directly above the main motor unit. The hydraulic end lubrication system uses an electric grease lubrication multi-point lubrication method to lubricate the hydraulic end of the plunger pump and the packing of the circulating centrifugal pump assembly and the filling centrifugal pump assembly.

[0008] Preferably, the power-end lubricating oil tank, the power-end lubrication pump, the circulating centrifugal pump assembly, and the filling centrifugal pump assembly are respectively located on the lower side of the chassis vehicle, while other structures are located on the upper side of the chassis vehicle. The whole machine power supply and distribution system integrates a transformer, a rectifier module, and an inverter module to provide electric drive for all the superstructure components of the chassis vehicle.

[0009] Preferably, the rated power of the permanent magnet synchronous motor of the small motor unit is 310kW, the reduction ratio of the gearbox is 16:1, and the plunger pump is an SQP3000 cementing pump.

[0010] Preferably, the system also includes an integrated electric cooling system located at the rear end of the chassis. The cooling pipes of the integrated electric cooling system extend from the left and right sides of the chassis toward the power supply and distribution system and the hydraulic system, and are used to dissipate heat from the power supply and distribution system and the hydraulic system.

[0011] Preferably, an operating platform is provided above the plunger pump, the operating platform extends toward the rear end of the chassis and is arranged adjacent to the metering tank and the mixing tank, and the control system is arranged on the operating platform in the form of an instrument control box.

[0012] Preferably, a hydraulic outrigger is provided at the bottom of the chassis and below the plunger pump, for extending downward to support the chassis during cementing operations.

[0013] Preferably, the hydraulic system includes an electric hydraulic station, the mixing tank is equipped with an agitator and a mixer, the agitator and mixer are respectively equipped with an ash valve cylinder and a water valve cylinder, the low-pressure manifold is equipped with a hydraulic butterfly valve, the high-pressure manifold is equipped with a hydraulic plug valve, and the electric hydraulic station provides power to the ash valve cylinder, the water valve cylinder, the hydraulic butterfly valve, the hydraulic plug valve, and the hydraulic outrigger.

[0014] Preferably, the jet centrifugal pump assembly, the circulating centrifugal pump assembly, and the injection centrifugal pump assembly all use a 120kW permanent magnet synchronous motor to drive the centrifugal pump.

[0015] The present invention has at least the following beneficial effects: The 3000-type electric cementing truck of the present invention integrates a hydraulic system, a whole machine power supply and distribution system, a main motor unit, a gearbox, a control system, an operating platform, a plunger pump, a large-displacement slurry mixing system, a slurry mixing tank, a metering tank, a jet centrifugal pump assembly, a circulating centrifugal pump assembly, an injection centrifugal pump assembly, a high-pressure manifold, and a low-pressure manifold on the chassis. The chassis only starts when the equipment is in motion. During cementing operations, the components on the chassis are powered by the whole machine power supply and distribution system and controlled by the control system. Compared with a single diesel engine drive system, the multi-motor main motor unit reduces the weight by 73% and the space occupied by 88%. At the same time, it increases the maximum output power of the whole machine to 3000hp, solving the problem that the output power of a single diesel-driven cementing truck and a single electric cementing truck cannot exceed 2500hp. It achieves a maximum working pressure of 83MPa and a maximum clean water working displacement of 3.1m³ / min. A single unit can simultaneously meet the needs of road transport, conventional cementing construction, and cementing construction of deep wells at depths of 10,000 meters.

[0016] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0017] Figure 1 This is a left-side structural view of the 3000-type electric cementing truck of the present invention; Figure 2 This is a right-side structural view of the 3000-type electric cementing truck of the present invention; Figure 3 This is a top view of the 3000-type electric cementing truck of the present invention; The following are the reference numerals in the instruction manual's attached diagrams: 1. Chassis; 2. Hydraulic system; 3. Power supply and distribution system; 4. Power-end lubrication and radiator; 5. Hydraulic-end lubrication and radiator system; 6. Control system; 7. Mixing tank; 8. Metering tank; 9. Integrated radiator system; 10. Toolbox; 11. Power-end lubricating oil tank; 12. Jet centrifugal pump assembly; 13. Circulating centrifugal pump assembly; 14. Large-displacement mixing system; 15. Operating platform; 16. Plunger pump; 17. Gearbox; 18. Main motor unit; 19. Injection centrifugal pump assembly; 20. High-pressure manifold; 21. Hydraulic outriggers; 22. Low-pressure manifold; 23. Power-end lubrication pump. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0019] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are all conventional methods, and the reagents and materials described are all commercially available unless otherwise specified. In the description of this invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0020] like Figure 1-3 As shown, the present invention provides a 3000-type electric cementing truck, including a chassis vehicle. The chassis vehicle has a control system 6 and a hydraulic system 2, a power supply and distribution system 3, a main motor unit 18, a gearbox 17, a plunger pump 16, a large-displacement slurry mixing system 14, a slurry mixing tank 7, a metering tank 8, a jet centrifugal pump assembly 12, a circulating centrifugal pump assembly 13, and an injection centrifugal pump assembly 19. The chassis vehicle also has a high-pressure manifold 20 and a low-pressure manifold 22. The valves on the high-pressure manifold 20 and the low-pressure manifold 22 are connected to the control system 6. The power supply and distribution system 3 supplies power to the main motor unit 18 and other components of the machine. Metering tank 8, jet centrifugal pump assembly 12, large-volume mixing system 14, and mixing tank 7 are sequentially connected through low-pressure manifold 22. The jet centrifugal pump assembly 12 draws in the liquid from metering tank 8 and pressurizes it, causing the liquid to be injected into the large-volume mixing system 14, where it mixes with the cement ash in the large-volume mixing system 14 to form cement slurry. The mixing tank 7 is used to stir and mix the cement ash. The circulating centrifugal pump assembly 13 is used for the cement slurry in the circulating mixing tank 7 and the large-displacement mixing system 14. The injection centrifugal pump assembly 19 is used to draw cement slurry from the mixing tank 7, pressurize it and pump it into the plunger pump 16 through the low-pressure manifold 22. The outlet of the plunger pump 16 is connected to the high-pressure manifold 20. The high-pressure manifold 20 is connected to the wellhead manifold. The cement slurry is transported to the bottom of the well through the high-pressure manifold 20 to complete the cementing operation. The main motor unit 18, the gearbox 17, and the plunger pump 16 together form a pumping system. The main motor unit 18 includes multiple small motor units, each of which is formed by multiple permanent magnet synchronous motors mechanically connected in series end to end. The rotors of the multiple permanent magnet synchronous motors are coupled through a rigid connecting shaft so that the electromagnetic torque is superimposed to drive the same load. Under the same size constraints, the power density and output torque of the motors are increased. The center of gravity of the pumping system is located at the center of the plunger pump 16. The permanent magnet synchronous motors are evenly distributed on both sides of the center of gravity of the pumping system. The main motor unit 18 outputs power to the plunger pump 16 through the direct-insertion gearbox 17. The displacement of the plunger pump 16 is adjusted by adjusting the speed of the main motor unit 18 through the control system 6.

[0021] To address the challenge of increasing equipment capacity under the constraints of limited installation space and axle load on the chassis, the following structures are designed for the chassis: control system 6, hydraulic system 2, overall power supply and distribution system 3, main motor unit 18, reduction gearbox 17, plunger pump 16, large-displacement slurry mixing system 14, slurry tank 7, metering tank 8, jet centrifugal pump assembly 12, circulating centrifugal pump assembly 13, injection centrifugal pump assembly 19, high-pressure manifold 20, and low-pressure manifold 22. The metering tank 8, jet centrifugal pump assembly 12, large-displacement slurry mixing system 14, and slurry tank 7 are sequentially connected via the low-pressure manifold 22. The outlet of the plunger pump 16 is connected to the high-pressure manifold 20, which in turn is connected to the wellhead manifold. For clarity, the direction of travel of the chassis is considered the forward direction (corresponding to...). Figure 1 The left end), the left and right sides are the two sides along the length of chassis 1 (corresponding to Figure 1On the chassis vehicle, arranged from front to back, the hydraulic system 2 and the power supply and distribution system 3 are arranged sequentially from the upper front side of the chassis 1 to the rear. The main motor unit 18, the gearbox 17, the plunger pump 16, and the mixing tank 7 are arranged sequentially from the upper front side of the middle chassis 1 to the rear. Above the plunger pump 16, the operating platform 15 and the large-displacement mixing system 14 are arranged sequentially to the rear. The operating platform 15 extends horizontally to cover the remaining space above the chassis 1 according to the positions of the plunger pump 16, the large-displacement mixing system 14, and the mixing tank 7. The control system 6 is installed on the operating platform 15. The toolbox 10 and other structures are arranged on the lower side of the middle chassis 1. The jet centrifugal pump assembly 12 is arranged on the upper side of the rear chassis 1. The metering tank 8 is arranged above the jet centrifugal pump assembly 12. The circulating centrifugal pump assembly 13 and the injection centrifugal pump assembly 19 are arranged side by side along the left and right direction on the lower side of the rear chassis 1. The cooling system is arranged in the remaining space above and below the chassis 1.

[0022] The main motor unit 18 typically consists of four smaller motors. Power is output to the piston pump 16 via a direct-injection piston pump 16 and a reduction gearbox 17. The power is then transmitted to the idler gear via four parallel input shafts in the reduction gearbox 17. After the first stage of reduction, the kinetic energy is transmitted to the planetary sun gear, and the planetary carrier outputs the kinetic energy to the piston pump 16. This structural design places the center of gravity of the entire pumping system at the center of the piston pump 16, resulting in strong stability. Furthermore, the main motor units 18 are evenly distributed on both sides of the center of gravity, ensuring no imbalance in the overall weight. The main motor unit 18 weighs approximately 4 tons and has dimensions of approximately 1.1m × 2m × 1.5m. In contrast, a single diesel engine drive system with a maximum output power of 3000hp weighs approximately 15 tons and has dimensions of approximately 5m × 2.5m × 2.5m. Compared to a single diesel engine drive system, this multi-motor drive system reduces weight by 73% and occupies 88% less space.

[0023] Based on the above technical solutions, the overall dimensions of the 3000-type electric cementing truck are approximately 12800×2550×4000mm, with a total weight of approximately 41 tons. The chassis truck is only started during equipment travel. During cementing operations, the components on top of the chassis truck are powered by the overall power distribution system 3 and controlled by the control system 6, achieving a maximum output power of 3000HP for cementing operations, which translates to a maximum working pressure of 83MPa and a maximum clean water discharge of 3.1m³ / min, providing equipment support for oil and gas exploration and development at depths of 10,000 meters.

[0024] In another technical solution, such as Figure 1-3 As shown, the high-volume mixing system 14 is equipped with a high-energy mixer and a densitometer. The circulating centrifugal pump assembly 13 draws cement slurry from the mixing tank 7. After pressurization, most of the cement slurry enters the high-energy mixer for circulating mixing, while a small portion of the cement slurry flows back to the mixing tank 7 after passing through the densitometer. This allows for real-time circulating mixing and monitoring of the mixing state of the slurry through the slurry density parameter.

[0025] In another technical solution, such as Figure 1-3 As shown, it also includes a lubrication system, which includes a power end lubrication system and a hydraulic end lubrication system for the plunger pump 16. The power end lubrication system for the plunger pump 16 includes a power end lubrication pump 23, a lubricating oil pump motor, a power end lubricating oil tank 11, and a power end lubrication radiator 4, which are used to provide lubrication and heat dissipation for the power end of the plunger pump 16. The power end lubrication radiator 4 is located directly above the main motor unit 18. The hydraulic end lubrication system adopts an electric grease lubrication multi-point lubrication method to lubricate the hydraulic end of the plunger pump 16 and the packing of the circulating centrifugal pump assembly 13 and the filling centrifugal pump assembly 19.

[0026] Specifically, the power-end lubricating oil tank 11, the power-end lubrication pump 23, the circulating centrifugal pump assembly 13, and the filling centrifugal pump assembly 19 are respectively located on the lower side of the chassis vehicle, while other structures are located on the upper side of the chassis vehicle. The overall power supply and distribution system 3 integrates a transformer, a rectifier module, and an inverter module to provide electric drive for all the upper components of the chassis vehicle. The space at the bottom of the chassis 1 is utilized and counterweighted. The upper structure of the chassis 1 is driven by electric power, and the wiring connections and controls are easily integrated.

[0027] In another technical solution, such as Figure 1-3 As shown, the rated power of the permanent magnet synchronous motor of the small motor unit is 310kW, the reduction ratio of the gearbox 17 is 16:1, and the plunger pump 16 is an SQP3000 cementing pump.

[0028] Two 310 kW permanent magnet synchronous motors are mechanically connected in series to form a small motor unit. This small motor unit directly couples the rotors of the two motors through a rigid connecting shaft. The electromagnetic torques are superimposed to drive the same load. The weight of this small motor unit is controlled at 0.6 tons, and the rated total output torque is 3300 Nm. The reduction gearbox 17 adopts a 16:1 high speed ratio reduction technology. The plunger pump 16 is an SQP3000 high-power lightweight cementing pump. Preferably, the jet centrifugal pump assembly 12, the circulating centrifugal pump assembly 13, and the injection centrifugal pump assembly 19 are all driven by 120kW permanent magnet synchronous motors to achieve a maximum output power of 3000HP for cementing operations, that is, a maximum working pressure of 83MPa and a maximum clean water working discharge of 3.1m³ / min.

[0029] In another technical solution, such as Figure 1-3As shown, it also includes an integrated electric cooling system installed at the rear end of the chassis 1. The cooling pipes of the integrated electric cooling system extend from the left and right sides of the chassis 1 toward the power supply and distribution system 3 and the hydraulic system 2, and are used to dissipate heat for the power supply and distribution system 3 and the hydraulic system 2. The integrated electric cooling system is located above the jet centrifugal pump assembly 12 and the circulating centrifugal pump assembly 13, and at the rear end of the chassis, which is conducive to heat dissipation and counterweight, and provides shielding and protection for the metering tank 8, the jet centrifugal pump assembly 12 and the circulating centrifugal pump assembly 13, and enhances the heat dissipation effect.

[0030] In another technical solution, such as Figure 1-3 As shown, an operating platform 15 is provided above the plunger pump 16. The operating platform 15 extends toward the rear end of the chassis vehicle and is adjacent to the metering tank 8 and the mixing tank 7. The operating platform 15 allows for convenient monitoring of the water level in the metering tank 8 and the liquid level in the mixing tank 7 at any time. Meanwhile, the control system 6 is arranged on the operating platform 15 in the form of an instrument control box. The control system 6 can control the cementing operation by controlling the main motor unit 18, the centrifugal pump motor, the high-displacement mixing system 14, and various manifold valves.

[0031] In another technical solution, such as Figure 1-3 As shown, a hydraulic outrigger 21 is also provided at the bottom of the chassis vehicle and below the plunger pump 16, which is used to extend downward to support the chassis vehicle during cementing operations, making the plunger pump 16 operate more stably.

[0032] In another technical solution, such as Figure 1-3 As shown, the hydraulic system 2 includes an electric hydraulic station. The mixing tank 7 is equipped with an agitator and a mixer. The agitator and mixer are respectively equipped with an ash valve cylinder and a water valve cylinder. The low-pressure manifold 22 is equipped with a hydraulic butterfly valve, and the high-pressure manifold 20 is equipped with a hydraulic plug valve. The electric hydraulic station provides power to the ash valve cylinder, the water valve cylinder, the hydraulic butterfly valve, the hydraulic plug valve, and the hydraulic support leg 21.

[0033] The layout and installation method for all structures mounted on chassis 1 are as follows: From front to back, the hydraulic system 2 and the power supply and distribution system 3 are sequentially arranged on the upper front side of chassis 1. The main motor unit 18, the gearbox 17, the plunger pump 16, and the mixing tank 7 are arranged sequentially on the upper side of the middle chassis 1. A power-end lubrication and radiator 4 is installed above the main motor unit 18. A hydraulic-end lubrication and radiator system 5, an operating platform 15, and a high-displacement mixing system 14 are sequentially arranged above the plunger pump 16. The operating platform 15 is positioned horizontally relative to the plunger pump 16 and the high-displacement mixing system. 14. The mixing tank 7 extends to cover the remaining space above the chassis 1. The hydraulic end lubrication and heat dissipation system 5 and the control system 6 are installed on the operating platform 15. The toolbox 10 and the power end lubrication oil tank 11 are set on the left side of the lower side of the middle chassis 1. The hydraulic outrigger 21 is set in the middle of the lower side of the middle chassis 1. The power end lubrication pump 23 is set on the right side of the lower side of the middle chassis 1. The jet centrifugal pump assembly 12 and the integrated heat dissipation system 9 are set on the upper side of the rear chassis 1. The metering tank 8 is set above the jet centrifugal pump assembly 12. The circulating centrifugal pump assembly 13 and the filling centrifugal pump assembly 19 are arranged side by side in the left and right direction on the lower side of the rear chassis 1.

[0034] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. The 3000-type electric cementing truck is characterized in that, The system includes a chassis, on which a control system is installed, along with a hydraulic system, a power supply and distribution system, a main motor unit, a gearbox, a piston pump, a large-displacement slurry mixing system, a slurry mixing tank, a metering tank, a jet centrifugal pump assembly, a circulating centrifugal pump assembly, and a priming centrifugal pump assembly. The chassis also has a high-pressure manifold and a low-pressure manifold, with valves on the high-pressure and low-pressure manifolds communicating with the control system. The power supply and distribution system supplies power to the main motor unit and other components of the machine. The metering tank, the jet centrifugal pump assembly, the large-volume mixing system, and the mixing tank are connected in sequence through a low-pressure manifold. The jet centrifugal pump assembly draws in the liquid from the metering tank, pressurizes it, and sprays it into the large-volume mixing system. The liquid is mixed with the cement ash in the large-volume mixing system to form cement slurry. The mixing tank is used to stir and mix the cement ash. The circulating centrifugal pump assembly is used for cement slurry in the circulating mixing tank and the large-displacement mixing system. The injection centrifugal pump assembly is used to draw cement slurry from the mixing tank, pressurize it and pump it into the plunger pump through the low-pressure manifold. The outlet of the plunger pump is connected to the high-pressure manifold, and the high-pressure manifold is connected to the wellhead manifold. The cement slurry is transported to the bottom of the well through the high-pressure manifold to complete the cementing operation. The main motor unit, gearbox, and plunger pump together form the pumping system. The main motor unit includes multiple small motor units, each of which is formed by multiple permanent magnet synchronous motors mechanically connected in series end to end. The rotors of multiple permanent magnet synchronous motors are coupled through a rigid connecting shaft so that the electromagnetic torque is superimposed to drive the same load. The center of gravity of the pumping system is located at the center of the plunger pump. The permanent magnet synchronous motors are evenly distributed on both sides of the center of gravity of the pumping system. The main motor unit outputs power to the plunger pump through a direct-insertion gearbox. The displacement of the plunger pump is adjusted by adjusting the speed of the main motor unit through the control system.

2. The 3000-type electric cementing truck as described in claim 1, characterized in that, The high-volume slurry mixing system is equipped with a high-energy mixer and a densitometer. The circulating centrifugal pump assembly draws cement slurry from the mixing tank. After pressurization, most of the cement slurry enters the high-energy mixer for circulating mixing, while a small portion of the cement slurry flows back to the mixing tank after passing through the densitometer.

3. The 3000-type electric cementing truck as described in claim 1, characterized in that, It also includes a lubrication system, which comprises a plunger pump power end lubrication system and a hydraulic end lubrication system. The plunger pump power end lubrication system includes a power end lubrication pump, a lubricating oil pump motor, a power end lubricating oil tank, and a power end lubrication radiator, which are used to provide lubrication and heat dissipation for the power end of the plunger pump. The power end lubrication radiator is located directly above the main motor unit. The hydraulic end lubrication system uses an electric grease lubrication multi-point lubrication method to lubricate the hydraulic end of the plunger pump and the packing of the circulating centrifugal pump assembly and the filling centrifugal pump assembly.

4. The 3000-type electric cementing truck as described in claim 3, characterized in that, The power-end lubricating oil tank, power-end lubrication pump, circulating centrifugal pump assembly, and injection centrifugal pump assembly are respectively located on the lower side of the chassis vehicle, while other structures are located on the upper side of the chassis vehicle. The whole machine power supply and distribution system integrates a transformer, rectifier module, and inverter module to provide electric drive for all the superstructure components of the chassis vehicle.

5. The 3000-type electric cementing truck as described in claim 1, characterized in that, The rated power of the permanent magnet synchronous motor of the small motor unit is 310kW, the reduction ratio of the gearbox is 16:1, and the plunger pump is an SQP3000 cementing pump.

6. The 3000-type electric cementing truck as described in claim 1, characterized in that, It also includes an integrated electric cooling system installed at the rear end of the chassis. The cooling pipes of the integrated electric cooling system extend from the left and right sides of the chassis toward the power supply and distribution system and the hydraulic system, and are used to cool the power supply and distribution system and the hydraulic system.

7. The 3000-type electric cementing truck as described in claim 1, characterized in that, An operating platform is provided above the plunger pump. The operating platform extends toward the rear end of the chassis and is arranged adjacent to the metering tank and the mixing tank. The control system is arranged on the operating platform in the form of an instrument control box.

8. The 3000-type electric cementing truck as described in claim 1, characterized in that, A hydraulic outrigger is also provided at the bottom of the chassis and below the plunger pump, for extending downward to support the chassis vehicle during cementing operations.

9. The 3000-type electric cementing truck as described in claim 8, characterized in that, The hydraulic system includes an electric hydraulic station. The mixing tank is equipped with an agitator and a mixer. The agitator and mixer are respectively equipped with an ash valve cylinder and a water valve cylinder. The low-pressure manifold is equipped with a hydraulic butterfly valve, and the high-pressure manifold is equipped with a hydraulic plug valve. The electric hydraulic station provides power to the ash valve cylinder, the water valve cylinder, the hydraulic butterfly valve, the hydraulic plug valve, and the hydraulic outriggers.

10. The 3000-type electric cementing truck as described in claim 1, characterized in that, The jet centrifugal pump assembly, the circulating centrifugal pump assembly, and the injection centrifugal pump assembly all use a 120kW permanent magnet synchronous motor to drive the centrifugal pump.

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