Electric transmission device for fracturing ship

Abstract

The electric transmission device comprises an alternating-current marine power supply, a phase-shifting transformer, a pre-charging transformer, a pre-magnetizing circuit, a frequency converter, a motor, a fracturing pump and a water-cooling heat dissipation system which are arranged on the fracturing ship, the pre-magnetizing transformer is adopted to pre-charge the phase-shifting transformer, and the pre-magnetizing circuit is adopted to pre-charge the frequency converter, so that the safety of equipment is improved; the water-cooling heat dissipation system is arranged to cool internal circulation cooling liquid of the phase-shifting transformer, the frequency converter and the motor at the same time, the heat dissipation system is high in integration degree, the wind driven generator is arranged on the fracturing ship so that wind power generation can be conducted through the offshore environment, and the energy storage amount can be increased; and air cooling heat dissipation is carried out on the outer side direction and the bottom plate of the electric transmission device, and the heat dissipation effect on the electric transmission device is improved through combined action with a water cooling heat dissipation system.

Description

Technical Field

[0001] The present invention relates to the technical field of electric transmission technology for oil and gas field marine equipment, and more specifically, to an electric transmission device for a fracturing vessel. Background Art

[0002] Fracturing vessels are designed to meet the needs of large-scale and batch fracturing operations for domestic offshore oil and gas wells, enabling large-scale fracturing operations across the entire sea area, batch fracturing operations for multiple wells at sea, and fracturing operations for gas wells and ultra-deep formations, with the goal of achieving stable and increased production. Among the main equipment used in fracturing operations on a fracturing vessel, the fracturing pump is the core equipment. This requires a transmission system to control an AC variable-frequency motor to drive the fracturing pump on the fracturing vessel. However, the current transmission system is relatively heavy overall, and its installation location and space on the fracturing vessel are limited. The transmission system also generates significant heat during operation, and the layout of the heat dissipation system is also a challenge, further occupying space on the fracturing vessel. The heat exchange surface and heat exchange efficiency are difficult to guarantee. Furthermore, the stability and safety of the transmission system in providing power to the fracturing pump need to be improved. Summary of the Invention

[0003] An object of the present invention is to solve at least the above problems and to provide at least the advantages which will be described hereinafter.

[0004] Another object of the present invention is to provide an electric transmission device for a fracturing vessel to solve the technical problem of insufficient safety and stability in the transmission device for a fracturing vessel in the prior art in providing electrical energy to a fracturing pump.

[0005] In order to achieve these objectives and other advantages according to the present invention, an electric transmission device for a fracturing ship is provided, including an AC ship power supply, a phase-shifting transformer, a pre-charging transformer, a pre-charging magnetic circuit, a frequency converter, an electric motor, a fracturing pump, and a water-cooling heat dissipation system arranged on the fracturing ship. The AC ship power supply is connected to the phase-shifting transformer, the pre-charging transformer is connected to the phase-shifting transformer, the pre-charging magnetic circuit is connected to the frequency converter, the phase-shifting transformer is connected to the frequency converter, the frequency converter is connected to the electric motor, and the fracturing pump is connected to the electric motor. The AC ship power supply provides power to the primary side of the pre-charging transformer, the secondary side of the pre-charging transformer pre-charges the secondary side of the phase-shifting transformer, the pre-charging magnetic circuit is used to raise the DC bus voltage of the frequency converter before the frequency converter is started, and the water-cooling heat dissipation system is used to cool the phase-shifting transformer, the frequency converter, and the electric motor.

[0006] Preferably, the frequency converter adopts NPC three-level 24-pulse rectification.

[0007] Preferably, the water-cooled heat dissipation system is provided with a cooling circulation pipeline, and the inlet of the cooling circulation pipeline is provided with a seawater purification structure and a liquid pump, which is used to use the purified seawater to cool the internal circulation coolant of the phase-shifting transformer, the inverter and the motor through the cooling circulation pipeline.

[0008] Preferably, the water-cooling heat dissipation system has a heat exchanger body, which is arranged in the electric transmission device near the front end of the fracturing vessel, and the fracturing pump is arranged near the rear end of the fracturing vessel.

[0009] Preferably, it also includes: A vibration-damping base, comprising a modular, detachably connected base plate, the base plate being used to mount the AC marine power supply, the phase-shifting transformer, the pre-charge transformer, the frequency converter, and the motor; inverted L-shaped limit brackets being mounted at the outer top corners and lateral intervals of the base plate; the limit brackets being fixed to the fracturing vessel and having an inner height slightly greater than the thickness of the base plate; vibration-damping air bags being connected at lateral intervals to the bottom of the base plate; each vibration-damping air bag being provided with a vent valve; and displacement sensors being respectively mounted on the top of the base plate, directly above the vibration-damping air bags; A wind turbine is vertically mounted on the fracturing vessel, with rotor blades on the top and power output cables at the bottom, which are connected to the energy storage battery pack; An air cooling assembly includes a vertically arranged induced draft duct, the upper end of the induced draft duct being located behind the wind turbine rotor blades, the lower end of the induced draft duct being detachably connected to a plurality of air cooling pipes, the air cooling pipes being arranged laterally along the AC marine power supply, the phase-shifting transformer, the pre-charge transformer, the frequency converter, the motor, and laterally along the bottom of the base plate, the pipe walls of the air cooling pipes being provided with air holes spaced apart along their lengths, the lower end of the induced draft duct being connected to an air pump, which is connected to a vibration-damping air bag; The control terminal is communicatively connected with the displacement sensor, the air pump, the ventilation valve, and the energy storage battery pack, and the energy storage battery pack is electrically connected with the displacement sensor, the air pump, and the ventilation valve.

[0010] Preferably, the upper end of the bottom plate is provided with holes at intervals, the lower end of the bottom plate is provided with a cavity and a support pin is provided downwardly at the cavity, the support pin is fixed to the upper surface of the fracturing vessel, the cavity is connected to the holes at corresponding positions, and a side hole connected to the cavity is also provided on the side of the bottom plate.

[0011] Preferably, the air cooling pipe is arranged laterally on the bottom of the base plate and the corresponding air holes are arranged toward the bottom of the base plate.

[0012] The present invention has at least the following beneficial effects: (1) The electric transmission device for a fracturing ship of the present invention uses a pre-charged magnetizing transformer to pre-charge the phase-shifting transformer, and a pre-charged magnetizing circuit to pre-charge the frequency converter, thereby improving the safety of the equipment.

[0013] (2) The frequency converter of the electric transmission device for the fracturing ship of the present invention adopts NPC three-level 24-pulse rectification to reduce system harmonics and improve system stability.

[0014] (3) The electric transmission device for the fracturing ship of the present invention is provided with a water-cooling heat dissipation system to cool the internal circulation coolant of the phase-shifting transformer, the frequency converter and the motor at the same time, and the heat dissipation system has a high degree of integration.

[0015] (4) The electric transmission device for a fracturing vessel of the present invention is also provided with a wind turbine on the fracturing vessel to utilize the offshore environment for wind power generation and increase energy reserves. A perforated bottom plate and an air-cooling component are provided on the fracturing vessel to perform air cooling and heat dissipation on the external sides and bottom plate of the electric transmission device, which works together with the water-cooling heat dissipation system to improve the heat dissipation effect of the electric transmission device.

[0016] Other advantages, objectives and features of the present invention will be reflected in part from the following description and will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the electrical connection structure of the electric transmission device for a fracturing vessel of the present invention; Figure 2 It is a structural schematic diagram of the air cooling assembly of the present invention; Figure numerals in the specification: 1. bottom plate, 2. limit card seat, 3. vibration-damping air bag, 4. displacement sensor, 5. wind turbine, 6. induced draft duct, 7. air cooling pipe, 8. air hole, 9. air pump, 10. hollow hole, 11. cavity, 12. support pin, 20. electric transmission device, 21. fracturing ship. DETAILED DESCRIPTION

[0018] The present invention will be described in further detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0019] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "horizontal", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0020] like Figure 1-2As shown, the present invention provides an electric transmission device for a fracturing vessel, comprising an AC marine power supply, a phase-shifting transformer, a pre-charging transformer, a pre-charging magnetic circuit, a frequency converter, an electric motor, a fracturing pump, and a water-cooling heat dissipation system arranged on a fracturing vessel 21. The AC marine power supply is connected to the phase-shifting transformer, the pre-charging transformer is connected to the phase-shifting transformer, the pre-charging magnetic circuit is connected to the frequency converter, the phase-shifting transformer is connected to the frequency converter, the frequency converter is connected to the electric motor, and the fracturing pump is connected to the electric motor. The AC marine power supply provides power to the primary side of the pre-charging transformer, the secondary side of the pre-charging transformer pre-charges the secondary side of the phase-shifting transformer, the pre-charging magnetic circuit is used to raise the DC bus voltage of the frequency converter before the frequency converter is started, and the water-cooling heat dissipation system is used to cool the phase-shifting transformer, the frequency converter, and the electric motor.

[0021] The electric transmission device 20 of the fracturing vessel 21 realizes the operation of the fracturing pump through the following process: (1) The AC marine power supply is stepped down and split into phases by a phase-shifting transformer and then transmitted to the frequency converter. The frequency converter converts the AC power into frequency-adjustable AC power after rectification and inversion and transmits it to the motor.

[0022] (2) Phase-shifting transformers, frequency converters and motors generate a lot of heat during operation. The water-cooling system produces hot water for the internal power components of the phase-shifting transformers, frequency converters and motors, which flows through a water-water heat exchanger and is cooled by external cooling water. This achieves cooling of the internal water and ensures that the temperature of the phase transformers, frequency converters and motors does not exceed the upper limit.

[0023] The electric transmission device 20 of the fracturing vessel 21 provides power for the fracturing pump on the fracturing vessel 21. The safety, stability and integration of the device meet the design requirements and produce good results. A pre-charged magnetic transformer is used to pre-charge the phase-shifting transformer, and a pre-charged magnetic circuit is used to pre-charge the frequency converter, thereby improving the safety of the equipment.

[0024] In another technical solution, Figure 1 As shown, the inverter adopts NPC three-level 24-pulse rectification to reduce system harmonics and improve system stability.

[0025] In another technical solution, the water-cooled heat dissipation system is provided with a cooling circulation pipeline, and the inlet of the cooling circulation pipeline is provided with a seawater purification structure and a liquid pump, which is used to use the purified seawater to cool the internal circulation coolant of the phase-shifting transformer, the inverter and the motor through the cooling circulation pipeline. The heat dissipation system has a high degree of integration and reduces the volume and space occupied on the fracturing vessel.

[0026] In another technical solution, Figure 1-2As shown, the water-cooled heat dissipation system has a heat exchanger body, which is arranged near the front end of the fracturing ship 21 in the electric transmission device 20, and the fracturing pump is arranged near the rear end of the fracturing ship 21, and the fracturing operation is performed at the rear end of the fracturing ship 21.

[0027] In another technical solution, Figure 2 As shown, it also includes: The vibration-damping base includes a modular, detachably connected base plate 1, on which the AC marine power supply, the phase-shifting transformer, the pre-charge transformer, the frequency converter, and the motor are mounted. Inverted L-shaped limit holders 2 are installed at the outer top corners and lateral intervals of the base plate 1. The limit holders 2 are fixed to the fracturing vessel 21 and have an inner height slightly greater than the thickness of the base plate 1. Vibration-damping air bags 3 are connected to the bottom lateral intervals of the base plate 1. Each vibration-damping air bag 3 is provided with a vent valve. Displacement sensors 4 are provided on the top of the base plate 1, directly above the vibration-damping air bags 3. The vibration-damping air bags 3 are used to abut against the base plate 1 for vibration reduction after being inflated. Wind turbines 5 are vertically mounted on both sides of the middle of the fracturing vessel 21. The top of the wind turbine 5 has rotor blades and the bottom has power output cables connected to the energy storage battery pack. An air cooling assembly includes a vertically arranged induced draft duct 6, the upper end of which is located behind the rotor blades at the top of the wind turbine 5. The lower end of the induced draft duct 6 is detachably connected to a plurality of air cooling pipes 7. The air cooling pipes 7 are arranged laterally of the AC marine power supply, the phase-shifting transformer, the pre-charge transformer, the frequency converter, and the motor. Air holes 8 are provided on the wall of the air cooling pipe 7 at intervals along the length. The lower end of the induced draft duct 6 is connected to an air pump 9, which is connected to the vibration damping air bag 3. The control terminal is respectively connected to the displacement sensor 4, the air pump 9, the ventilation valve, and the energy storage battery pack for communication; and the energy storage battery pack is respectively connected to the displacement sensor 4, the air pump 9, and the ventilation valve for electrical communication.

[0028] The bottom plate 1 is installed on the fracturing vessel 21. The positions for fixing the AC marine power supply, phase-shifting transformer, pre-charging transformer, frequency converter, and motor are arranged on the bottom plate 1. The motor is connected to the fracturing pump. An air-cooling component and a water-cooling heat dissipation system are set on the bottom plate 1 to jointly improve the heat dissipation effect of the main structure of the electric transmission device 20 on the bottom plate 1. The liquid exchanger of the air-cooling heat dissipation system can be set at the front end of the bottom plate 1 (on the bow side of the fracturing vessel 21), mainly connected to the phase-shifting transformer, frequency converter and motor with an internal circulation cooling circuit to dissipate heat. The heat inside the main structure is dissipated by relying on the surface area of ​​the circuit and the heat exchange rate of the coolant. A wind turbine 5 can be detachably installed on the fracturing vessel 21 to generate wind energy by utilizing the offshore environment of the fracturing vessel 21. The electricity is stored in the energy storage battery pack and can be used to power the displacement sensor 4, the air pump 9, and the vent valve, thereby improving the efficiency of offshore energy utilization and reducing the energy consumption of the existing AC marine power supply.

[0029] The wind turbine 5 is a common facility for generating electricity using wind energy. The specific structure and principle of wind energy generation are not described in detail here. The air cooling pipe 7 can be spliced ​​and arranged according to the installation space and position of the electric transmission device 20. Under the action of the rotation of the wind rotor blades and the wind energy itself, the air cooling component forms an air flow into the induced draft pipe 6. The air flow enters the air cooling pipe 7 downward and flows out from the air hole 8, thereby strengthening the air circulation outside the electric transmission device 20 and improving the external heat dissipation effect of the electric transmission device 20. When the air pump 9 is started, the air inlet end of the air pump 9 can directly draw air from the induced draft pipe 6, increase the flow rate in the induced draft pipe 6 and the air cooling pipe 7, and improve the air circulation rate. At the same time, according to the displacement sensor 4 detecting the position of the bottom plate 1 with obvious amplitude, the vent valve at the corresponding position is opened, and the air pump 9 is used to directionally inflate the open and connected vibration damping air bag 3, adjust the inflation amount according to the amplitude, close the vent valve, support the bottom plate 1, achieve vibration reduction of the bottom plate 1, and improve the safety of the operation of the electric transmission device 20.

[0030] In another technical solution, Figure 2 As shown, the upper end of the base plate 1 is provided with holes 10 at intervals, the lower end of the base plate 1 is provided with a cavity 11 and a support pin 12 is provided downwardly at the cavity 11. It is fixedly connected to the structural parts on the fracturing ship 21 through part of the support pin 12. The cavity 11 is connected to the holes 10 at the corresponding positions, and a side hole connected to the cavity 11 is opened on the side of the base plate 1 to improve the heat dissipation effect of the bottom of the electric transmission device 20.

[0031] In another technical solution, Figure 1-2As shown, the air holes 8 arranged on the sides of the AC marine power supply, the phase-shifting transformer, the pre-charging transformer, the inverter, and the motor are arranged toward the corresponding AC marine power supply, the phase-shifting transformer, the pre-charging transformer, the inverter, and the motor. The air-cooling pipe 7 is arranged laterally on the bottom of the base plate 1, and the corresponding air holes 8 are arranged toward the bottom of the base plate 1, so as to discharge air to the space inside and below the base plate 1 during vibration reduction, strengthen the air circulation to the space inside the base plate 1, and further improve the heat dissipation effect of the bottom.

[0032] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. An electric transmission device for a fracturing vessel, characterized in that: It includes an AC marine power supply, a phase-shifting transformer, a pre-charging transformer, a pre-charging magnetic circuit, a frequency converter, an electric motor, a fracturing pump, and a water-cooling heat dissipation system arranged on the fracturing vessel. The AC marine power supply is connected to the phase-shifting transformer, the pre-charging transformer is connected to the phase-shifting transformer, the pre-charging magnetic circuit is connected to the frequency converter, the phase-shifting transformer is connected to the frequency converter, the frequency converter is connected to the electric motor, and the fracturing pump is connected to the electric motor. The AC marine power supply provides power to the primary side of the pre-charging transformer, the secondary side of the pre-charging transformer pre-charges the secondary side of the phase-shifting transformer, the pre-charging magnetic circuit is used to raise the DC bus voltage of the frequency converter before the frequency converter is started, and the water-cooling heat dissipation system is used to cool the phase-shifting transformer, the frequency converter and the electric motor.

2. The electric transmission device for a fracturing vessel according to claim 1, characterized in that: The frequency converter adopts NPC three-level 24-pulse rectification.

3. The electric transmission device for a fracturing vessel according to claim 1, characterized in that: The water-cooled heat dissipation system is provided with a cooling circulation pipeline, and the inlet of the cooling circulation pipeline is provided with a seawater purification structure and a liquid pump, which is used to use the purified seawater to cool the internal circulation coolant of the phase-shifting transformer, the frequency converter and the motor through the cooling circulation pipeline.

4. The electric transmission device for a fracturing vessel according to claim 1, wherein: The water-cooling heat dissipation system comprises a heat exchanger body, which is arranged in the electric transmission device near the front end of the fracturing vessel, and the fracturing pump is arranged near the rear end of the fracturing vessel.

5. The electric transmission device for a fracturing vessel according to claim 1, characterized in that: Also includes: A vibration-damping base, comprising a modular, detachably connected base plate, the base plate being used to mount the AC marine power supply, the phase-shifting transformer, the pre-charge transformer, the frequency converter, and the motor; inverted L-shaped limit brackets being mounted at the outer top corners and lateral intervals of the base plate; the limit brackets being fixed to the fracturing vessel and having an inner height slightly greater than the thickness of the base plate; vibration-damping air bags being connected at lateral intervals to the bottom of the base plate; each vibration-damping air bag being provided with a vent valve; and displacement sensors being respectively mounted on the top of the base plate, directly above the vibration-damping air bags; A wind turbine is vertically mounted on the fracturing vessel, with rotor blades on the top and power output cables at the bottom, which are connected to the energy storage battery pack; An air cooling assembly includes a vertically arranged induced draft duct, the upper end of the induced draft duct being located behind the wind turbine rotor blades, the lower end of the induced draft duct being detachably connected to a plurality of air cooling pipes, the air cooling pipes being arranged laterally along the AC marine power supply, the phase-shifting transformer, the pre-charge transformer, the frequency converter, the motor, and laterally along the bottom of the base plate, the pipe walls of the air cooling pipes being provided with air holes spaced apart along their lengths, the lower end of the induced draft duct being connected to an air pump, which is connected to a vibration-damping air bag; The control terminal is communicatively connected with the displacement sensor, the air pump, the ventilation valve, and the energy storage battery pack, and the energy storage battery pack is electrically connected with the displacement sensor, the air pump, and the ventilation valve.

6. The electric transmission device for a fracturing vessel according to claim 5, characterized in that: Holes are arranged at intervals on the upper end of the bottom plate, a cavity is provided at the lower end of the bottom plate, and a support pin is provided downwardly at the cavity. The support pin is fixed to the upper surface of the fracturing vessel, and the cavity is connected to the hollow holes at corresponding positions. Side holes connected to the cavity are also opened on the side of the bottom plate.

7. The electric transmission device for a fracturing vessel according to claim 6, characterized in that: The air cooling pipe is arranged laterally on the bottom of the base plate, and the corresponding air holes are arranged toward the bottom of the base plate.

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