Novel electric fracturing power driving device

Abstract

The utility model discloses a novel electric fracturing power driving device which comprises a water-cooling heat dissipation system, an inverter, a small-power permanent magnet synchronous motor and a fracturing pump, the inverter and the small-power permanent magnet synchronous motor dissipate heat through the water-cooling heat dissipation system, the inverter is connected with the small-power permanent magnet synchronous motor, and the fracturing pump is connected with the small-power permanent magnet synchronous motor. The small-power permanent magnet synchronous motors are connected with the fracturing pump, a plurality of small-power permanent magnet synchronous motors are arranged, a plurality of corresponding inverters are also arranged, and the small-power permanent magnet synchronous motors and the corresponding inverters are partially or completely started and stopped according to load requirements of the fracturing pump. The power driving device is simple in structure, high in integration level and high in equipment efficiency, reduces cable configuration, and reduces line loss.

Description

Technical Field

[0001] The utility model relates to the technical field of power drive for oil and gas field equipment, and more specifically, to a novel electric fracturing power drive device. Background Art

[0002] In the current electric fracturing power drive system, the conventional practice is to install the water cooling system and inverter in an independent frequency conversion room, which is separated from the fracturing skid. During use, due to the long distance between the frequency conversion room and the fracturing skid, and the need to connect three-phase cables, the workers have to lay out, reel in, connect and remove wires with high labor intensity. At the same time, the frequency conversion room needs to be transported independently, which brings great inconvenience to transportation costs and transportation. In addition, the fracturing pump is driven by a single AC variable frequency asynchronous motor. Due to the low efficiency of AC variable frequency asynchronous motors, especially when running at low power, the efficiency is even lower. This leads to serious waste of motor power during the operation of the fracturing pump, and the motor works in the low efficiency area for a long time, resulting in increased electricity bills. All of the above are technical problems that need to be solved in this application. Utility Model Content

[0003] One purpose of the utility model is to provide a novel electric fracturing power drive device, which has a simple structure, high integration, and high equipment efficiency, while reducing cable configuration and line loss.

[0004] In order to solve the above technical problems, the utility model provides a new electric fracturing power drive device, including a water cooling system, an inverter, a low-power permanent magnet synchronous motor and a fracturing pump. The inverter and the low-power permanent magnet synchronous motor are both cooled by the water cooling system. The inverter is connected to the low-power permanent magnet synchronous motor, and the low-power permanent magnet synchronous motor is connected to the fracturing pump. A plurality of low-power permanent magnet synchronous motors are provided, and a plurality of corresponding inverters are also provided. The plurality of low-power permanent magnet synchronous motors and the corresponding inverters are partially or completely opened and closed according to the load requirements of the fracturing pump.

[0005] Preferably, it also includes an air-cooled heat dissipation device, which is connected to the fracturing pump and is used to dissipate heat from the fracturing pump.

[0006] Preferably, the water cooling system, inverter, small-power permanent magnet synchronous motor, fracturing pump and air cooling device are all integrated on the fracturing skid.

[0007] Preferably, one water cooling and heat dissipation system is provided to cool multiple inverters and multiple low-power permanent magnet synchronous motors simultaneously.

[0008] Preferably, the inverter is connected to an external DC power source via a cable, and after obtaining DC power, the inverter converts the DC power into frequency-adjustable AC power and transmits it to a plurality of low-power permanent magnet synchronous motors.

[0009] Preferably, it also includes a control system, which is used to control the opening and closing of multiple low-power permanent magnet synchronous motors and the opening and closing of the air-cooling heat dissipation device.

[0010] The utility model at least has the following beneficial effects:

[0011] The connection mode, arrangement position and influence of the equipment in the power drive device of the utility model have undergone significant changes compared with the power drive devices of the previous equipment, and have produced better effects, which are mainly reflected in:

[0012] (1) The utility model adopts multiple small-power water-cooled permanent magnet synchronous motors to drive the fracturing pump. The inverter can control whether the permanent magnet synchronous motor is fully or partially running, so that the permanent magnet synchronous motor-driven fracturing pump always runs in the high-efficiency area, thereby improving the equipment efficiency;

[0013] (2) The water cooling system of the utility model can cool the inverter and multiple small-power permanent magnet synchronous motors at the same time, and the equipment utilization rate is high;

[0014] (3) The water-cooling heat dissipation system and inverter of the utility model are no longer installed in an independent frequency conversion room, that is, the water-cooling heat dissipation system, inverter, multiple small-power permanent magnet synchronous motors, fracturing pumps, air-cooling heat dissipation devices and fracturing skids are integrated into an integrated arrangement, with a compact overall structure and high integration, which reduces the labor intensity of workers in laying, winding, wiring and removing wires and reduces transportation costs.

[0015] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through research and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a system block diagram of the utility model.

[0017] Description of reference numerals:

[0018] 1. Water cooling system; 2. Inverter; 3-1~3-M, multiple small-power permanent magnet synchronous motors; 4. Fracturing pump; 5. Air cooling device; 6. Fracturing skid; 7. External DC power supply. DETAILED DESCRIPTION

[0019] In order to better understand the purpose, structure and function of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement it according to the description.

[0020] 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 "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which 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 direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0021] like Figure 1 As shown, the utility model provides a novel electric fracturing power drive device, including a water cooling and heat dissipation system 1, an inverter 2, a plurality of small-power permanent magnet synchronous motors 3-1 to 3-M, a fracturing pump 4, an air cooling and heat dissipation device 5, a cable, and a fracturing skid 6. An external DC power supply 7 is connected to the inverter 2, the water cooling and heat dissipation system 1 is connected to the inverter 2, the water cooling and heat dissipation system 1 is connected to the permanent magnet synchronous motor, the inverter 2 is provided with a plurality of small-power permanent magnet synchronous motors 3-1 to 3-M and connected one by one to the plurality of small-power permanent magnet synchronous motors 3-1 to 3-M, the plurality of small-power permanent magnet synchronous motors 3-1 to 3-M are all connected to the fracturing pump 4, the air cooling and heat dissipation device 5 is connected to the fracturing pump 4, and the water cooling and heat dissipation system 1, the inverter 2, a plurality of small-power permanent magnet synchronous motors 3-1 to 3-M, the fracturing pump 4, and the air cooling and heat dissipation device 5 are all installed on the fracturing skid 6. The power drive device of the present application adopts a water-cooling and heat dissipation system, an inverter, multiple small-power permanent magnet synchronous motors, a fracturing pump, and an air-cooling and heat dissipation device, all of which are integrated into a skid and integrated on the fracturing skid, with a high degree of integration.

[0022] Multiple small-power water-cooled permanent magnet synchronous motors are designed to drive the fracturing pumps simultaneously, or partially drive the fracturing pumps according to load requirements, thereby improving equipment efficiency and meeting efficient use under different fracturing conditions.

[0023] The water cooling system delivers coolant to the inverter and multiple small-power permanent-magnet synchronous motors at the same time, ensuring that the temperature of the inverter and multiple small-power permanent-magnet synchronous motors does not exceed the upper limit during operation.

[0024] The external DC power supply is transmitted to the inverter through cables, which delivers power to the new electric fracturing power drive device, reducing cables and losses.

[0025] The novel electric fracturing power drive device of the present application realizes the operation of the fracturing pump through the following process:

[0026] 1. The external DC power supply is transmitted to the inverter through a cable. After the inverter obtains the DC power, it converts the DC power into frequency-adjustable AC power and transmits it to multiple small-power permanent magnet synchronous motors.

[0027] 2. The inverter and multiple small-power permanent magnet synchronous motors will generate a lot of heat during operation. The water cooling system transports the coolant to the pipelines of the inverter and multiple small-power permanent magnet synchronous motors respectively to form a cycle. The coolant is used to exchange heat between the heating elements of the inverter and the heat of the multiple small-power permanent magnet synchronous motors to ensure that the temperature of the inverter and the multiple small-power permanent magnet synchronous motors does not exceed the upper limit.

[0028] 3. Multiple small-power permanent magnet synchronous motors are controlled by the inverter to run all or part of the permanent magnet synchronous motors according to the fracturing load conditions, so as to achieve the operation of the fracturing pump driven by the permanent magnet synchronous motor in the high-efficiency area. The specific method is to set up a control system, which is used to control the opening and closing of multiple small-power permanent magnet synchronous motors and the opening and closing of the air-cooling heat dissipation device.

[0029] The control system controls the start and close method of multiple small-power permanent magnet synchronous motors as follows: the control system obtains the fracturing load of the fracturing pump and calculates its proportion of the total load, and then controls several of the small-power permanent magnet synchronous motors to start, and the remaining small-power permanent magnet synchronous motors to shut down, and the proportion of the number of started small-power permanent magnet synchronous motors to the total number is greater than or equal to the proportion of the fracturing load of the fracturing pump to the total load. For example: if there are 10 motors in the M motors of this application, then if the fracturing load is only 1 / 10 of the total load, then only 1 motor is run, if it is 1 / 5 of the total load, then only 2 motors are run... If it is 100% of the total load, then 10 motors are run.

[0030] 4. When the temperature of the fracturing pump is too high during operation, the air-cooled heat dissipation device automatically operates to dissipate heat for the fracturing pump.

[0031] The control system controls the opening and closing method of the air-cooling heat dissipation device as follows: the control system monitors the operating temperature of the fracturing pump in real time. When the operating temperature is higher than the preset operating temperature, the control system controls the air-cooling heat dissipation device to start; when the operating temperature is lower than the preset operating temperature, the control system controls the air-cooling heat dissipation device to close.

[0032] It can be understood that the present invention is described by some embodiments, and those skilled in the art know that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the present invention. Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation mode. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, other modifications can be easily realized. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to specific details and the illustrations shown and described here.

Claims

1. A new type of electric fracturing power drive device, characterized in that: It includes a water cooling system, an inverter, a low-power permanent magnet synchronous motor and a fracturing pump. The inverter and the low-power permanent magnet synchronous motor both dissipate heat through the water cooling system. The inverter is connected to the low-power permanent magnet synchronous motor, and the low-power permanent magnet synchronous motor is connected to the fracturing pump. A plurality of low-power permanent magnet synchronous motors are provided, and a plurality of corresponding inverters are also provided. The plurality of low-power permanent magnet synchronous motors and the corresponding inverters are partially or completely opened or closed according to the load requirements of the fracturing pump.

2. The novel electric fracturing power drive device according to claim 1 is characterized in that: It also includes an air-cooled heat sink, which is connected to the fracturing pump and is used to dissipate heat from the fracturing pump.

3. The novel electric fracturing power drive device according to claim 2 is characterized in that: The water-cooling system, inverter, small-power permanent magnet synchronous motor, fracturing pump and air-cooling device are all integrated on the fracturing skid.

4. The novel electric fracturing power drive device according to claim 1, characterized in that: The water cooling and heat dissipation system is provided with one and can cool a plurality of inverters and a plurality of small-power permanent magnet synchronous motors simultaneously.

5. The novel electric fracturing power drive device according to claim 1 is characterized in that: The inverter is connected to an external DC power source through a cable. After obtaining DC power, the inverter converts the DC power into frequency-adjustable AC power and transmits it to multiple small-power permanent magnet synchronous motors.

6. The novel electric fracturing power drive device according to claim 2, characterized in that: It also includes a control system, which is used to control the opening and closing of multiple small-power permanent magnet synchronous motors and the opening and closing of air-cooling heat dissipation devices.

Images