Electrically-driven automatic control system of oil field water injection pump

Abstract

The utility model aims to provide an electric drive automatic control system of an oil field water injection pump, and belongs to the technical field of water injection pump control. The system comprises a power grid motor controller which is respectively connected with an all-in-one electric drive assembly and a master control computer through cables; the all-in-one electric drive assembly comprises a permanent magnet synchronous motor and a gearbox, and the power output end of the gearbox is connected with the power end of the water injection pump through a transmission shaft; and the master control computer comprises a PLC (Programmable Logic Controller) which is respectively connected with the pressure sensor, the displacement sensor, the rotating speed sensor and the temperature sensor of the water injection pump through cables. Through the synergistic effect of the electric control computer, the power grid motor controller and the all-in-one electric drive assembly, continuous monitoring of parameters such as the pressure, the displacement, the rotating speed and the lubricating temperature of the water injection pump is conveniently achieved, the size is small, and the automation degree is high.

Description

Technical Field

[0001] The utility model relates to the technical field of water injection pump control, in particular to an electric drive automatic control system for an oil field water injection pump. Background Art

[0002] At present, the booster water injection equipment for oilfield exploitation water injection wells uses diesel engines or three-phase asynchronous motors as power sources to drive water injection pumps for water injection operations. Among them, the matching mode of diesel engine driving water injection pumps is the most common design idea. This type of equipment uses diesel as the power system fuel, which consumes a lot of energy and has high costs. At the same time, the equipment generates 90 decibels to 110 decibels of noise when it is running, and also generates a lot of exhaust gas, etc., which pollutes the production and life of residents around the equipment. Conventional three-phase asynchronous motors as power systems need to be equipped with an external reduction transmission system, and because the speed of conventional three-phase asynchronous motors is a fixed value, the water injection parameters of the water injection pump cannot be continuously controlled. At the same time, conventional three-phase asynchronous motors use air cooling / wind cooling to dissipate heat, and the overall volume is relatively large. Utility Model Content

[0003] The purpose of the utility model is to provide an electric drive automatic control system for an oilfield water injection pump, which conveniently realizes continuous monitoring of parameters such as pressure, displacement, speed and lubrication temperature of the water injection pump through the coordinated action of an electronic control computer, a power grid motor controller and an all-in-one electric drive assembly, with a small size and a high degree of automation.

[0004] To achieve the above purpose, the utility model adopts the following technical solution: an electric drive automatic control system for an oilfield water injection pump, the electric drive control system comprising:

[0005] A power grid motor controller, which is connected to the all-in-one electric drive assembly and the master control computer through cables, converts the external power grid into a power source for the all-in-one electric drive assembly, and monitors the output torque, output speed and output state of the all-in-one electric drive assembly under the control of the master control computer;

[0006] An all-in-one electric drive assembly, comprising a permanent magnet synchronous motor and a gearbox, wherein the permanent magnet synchronous motor and the gearbox are connected as a whole along the axial direction of the permanent magnet synchronous motor, and a power output end of the gearbox is connected to a power end of a water injection pump through a transmission shaft;

[0007] The master control computer comprises a PLC controller, and the PLC controller is respectively connected with a pressure sensor, a displacement sensor, a rotation speed sensor and a temperature sensor of the water injection pump through cables.

[0008] As an improvement of the present invention, the grid motor controller includes a rectifier, a motor controller and a reactor.

[0009] As an improvement of the present invention, the electric drive control system further includes a DC-DC converter and a battery, and the system transmits part of the electric energy to the battery through the DC-DC converter.

[0010] As an improvement of the present invention, the electric drive control system further comprises an anti-torque protector, which is connected to the master control computer via a cable and realizes braking of the transmission shaft under the control of the master control computer.

[0011] The beneficial effects of the utility model are as follows: the utility model provides an electric drive automatic control system for an oilfield water injection pump, which includes an electronic control computer, a power grid motor controller and an all-in-one electric drive assembly. Among them, the power grid motor controller can convert the external power grid or new energy battery pack into a stable and reliable power source and transmit it to the permanent magnet synchronous motor of the all-in-one electric drive assembly, and the permanent magnet synchronous motor drives the water injection pump to work through the gearbox and the transmission shaft; during the working process, the PLC controller of the electronic control computer realizes continuous monitoring of parameters such as pressure, displacement, speed and lubrication temperature of the water injection pump according to the feedback signals of the pressure sensor, displacement sensor, speed sensor and temperature sensor of the water injection pump through the joint cooperation of the power grid motor controller and the all-in-one electric drive assembly, and realizes fine control, remote control and unmanned control of the whole system under the action of the master control computer, with small size and high degree of automation.

[0012] The all-in-one electric drive assembly is an integrated speed-changing module for new energy motors. Its power density is 1.2 times that of conventional three-phase asynchronous motors, and its weight is only 70% of that of conventional three-phase asynchronous motors. Therefore, at the same power, the equipment volume can be reduced by about 40% in length.

[0013] Furthermore, the electric drive control system also includes a DC-DC converter and a battery, and the system transmits part of the electric energy to the battery through the DC-DC converter. The battery can provide power source for low-voltage electrical equipment such as the master control computer and lighting.

[0014] Furthermore, the electric drive control system also includes an anti-torque protector, which is connected to the master control computer through a cable and realizes the braking of the transmission shaft under the control of the master control computer. Through the setting of the anti-torque protector, when the master control computer sends a stop signal, the anti-torque protector is started to force the permanent magnet synchronous motor to stop, ensuring that no excessive current caused by reverse torque is generated during the shutdown process, thereby achieving the function of protecting the permanent magnet synchronous motor and extending the service life of the permanent magnet synchronous motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] In the figure, 1. grid motor controller; 2. battery; 3. DC-DC converter; 4. master control computer; 5. transmission shaft; 6. anti-torque protector; 7. water injection pump; 8. all-in-one electric drive assembly; 9. water cooling system. DETAILED DESCRIPTION

[0017] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0018] like Figure 1 As shown, an electric drive automatic control system for an oilfield water injection pump includes a power grid motor controller 1, an all-in-one electric drive assembly 8, a master control computer 4 and a water injection pump 7. Among them, the power grid motor controller 1 is also called a three-in-one controller, which includes a rectifier, a motor controller and a reactor. The above-mentioned power grid motor controller 1 is an existing known device, and its specific composition and working principle are not introduced in detail here. The power grid motor controller 1 is connected to the all-in-one electric drive assembly 8 and the master control computer 4 respectively through cables. It converts an external power source such as an external power grid or a new energy battery pack into a power source for the all-in-one electric drive assembly 8, and monitors the output torque, output speed and output state of the all-in-one electric drive assembly 8 under the control of the master control computer 4; the all-in-one electric drive assembly 7 includes a permanent magnet synchronous motor and a gearbox, and the permanent magnet synchronous motor and the gearbox are connected as a whole along the axial direction of the permanent magnet synchronous motor, and the power output end of the gearbox is connected to the power end of the water injection pump 7 through a transmission shaft 5. It should be noted that the above-mentioned all-in-one electric drive assembly 8 is a new energy motor speed-changing integrated module, which belongs to the existing known equipment, and the all-in-one electric drive assembly disclosed in Chinese patent CN216231640U is preferably used.

[0019] The above-mentioned master control computer 4 includes a PLC controller, and the PLC controller is connected to the pressure sensor, displacement sensor, rotation speed sensor and temperature sensor of the water injection pump 7 through cables.

[0020] Preferably, in order to provide a power source for low-voltage electrical equipment such as the master control computer 4 and lighting, the electric drive control system also includes a DC-DC converter 3 and a battery 2. The system transmits part of the electrical energy to the battery 2 through the DC-DC converter 3, and then provides power to the above-mentioned low-voltage electrical equipment through the battery 2.

[0021] Preferably, an anti-torque protector 6 is installed on the transmission shaft 5, and the anti-torque protector 6 is connected to the master control computer 4 through a cable, and realizes the braking of the transmission shaft 5 under the control of the master control computer 4. Preferably, the anti-torque protector 6 uses a hydraulic caliper friction brake disc to realize the braking of the transmission shaft 5. Through the setting of the anti-torque protector 6, when the PLC controller in the master control computer 4 sends a stop command to the anti-torque protector 6, the anti-torque protector 6 starts braking, and the permanent magnet synchronous motor is forced to stop under the action of the transmission shaft 5, ensuring that no excessive current caused by reverse torque is generated during the shutdown process, thereby achieving the function of protecting the permanent magnet synchronous motor and extending the service life of the permanent magnet synchronous motor.

[0022] Preferably, the electric drive control system is also equipped with a water cooling system 9, in which cooling coils are provided at various heat points inside the system and a cooling pump is used to drive the coolant circulation to reduce the heat generated by the system, that is, the water cooling system 9 realizes effective cooling of the grid motor controller 1 and the all-in-one electric drive assembly 8 through the water pump circulation. The utility model uses water as a cooling medium, which can effectively absorb and take away the heat generated by the electrical equipment.

[0023] It should be noted that the various operating parameters in the entire electric drive control system can be set in advance and controlled by the master control computer 4, that is, the PLC controller in the master control computer 4 can monitor the power parameters of the power grid motor controller, and can also monitor the output torque, output speed and output state of the all-in-one electric drive assembly 8, and can also monitor the operating parameters such as pressure, displacement, speed and lubrication temperature of the water injection pump 7. At the same time, the power input parameters are changed according to the preset logical instructions so that the monitored parameters of the water injection pump 7 are kept within a reasonable range of use, thereby realizing the automated operation of the equipment. Preferably, the water injection pump 7 is a three-cylinder plunger pump.

[0024] The above is a detailed introduction to an electric drive automatic control system for an oilfield water injection pump provided by the utility model. This article uses specific examples to illustrate the technical principles and implementation methods of the utility model. The above embodiments are only used to help understand the method and core ideas of the utility model; at the same time, for general technicians in this field, according to the ideas of the utility model, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the utility model.

Claims

1. An electric drive automatic control system for an oilfield water injection pump, characterized in that: The electric drive control system comprises: A power grid motor controller, which is connected to the all-in-one electric drive assembly and the master control computer through cables, converts the external power grid into a power source for the all-in-one electric drive assembly, and monitors the output torque, output speed and output state of the all-in-one electric drive assembly under the control of the master control computer; An all-in-one electric drive assembly, comprising a permanent magnet synchronous motor and a gearbox, wherein the permanent magnet synchronous motor and the gearbox are connected as a whole along the axial direction of the permanent magnet synchronous motor, and a power output end of the gearbox is connected to a power end of a water injection pump through a transmission shaft; The master control computer comprises a PLC controller, and the PLC controller is respectively connected with a pressure sensor, a displacement sensor, a rotation speed sensor and a temperature sensor of the water injection pump through cables.

2. The electric drive automatic control system of an oilfield water injection pump according to claim 1, characterized in that: The grid motor controller includes a rectifier, a motor controller and a reactor.

3. The electric drive automatic control system of an oilfield water injection pump according to claim 1, characterized in that: The electric drive control system also includes a DC-DC converter and a battery, and the system transmits part of the electric energy to the battery through the DC-DC converter.

4. An electric drive automatic control system for an oilfield water injection pump according to claim 1, 2 or 3, characterized in that: The electric drive control system also includes an anti-torque protector, which is connected to the master control computer via a cable and realizes braking of the transmission shaft under the control of the master control computer.

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