I. Introduction

 

In the late stage of oilfield oil recovery, oil storage is nearly exhausted. In order to increase the productivity of oilfields, water injection oil recovery technology is generally used. Water injection oil recovery rate: Daqing (4.0m3 water/ton crude oil), Panjin local oilfield (17.4m3 water/ton crude oil), each water injection well approximately controls the oil-bearing area 0.3～1.2km2, approximately controls 2 oil production wells, and the water injection volume is 30 ～50m3/d. Water injection and oil recovery rely on injecting into the oil-bearing layer a mixed aqueous solution that has been treated with chemical raw materials such as scale inhibitors, clay stabilizers, corrosion inhibitors, and chemical oil displacement substances in proportion, and the oil-bearing layer is flooded by water. Taken out together.

2. Advantages of frequency converter ED3100 used in oilfield water injection

 

1. V/F control mode (one drag multiple can be realized)

 

A. Advanced vector control algorithm, optimized SVPWM output, low output harmonics and small motor temperature rise.

 

B. Realize optimal energy-saving operation through motor parameter detection.

 

2. Open loop vector control (SVC) mode

 

A. Using TI special DSP processor for high-speed motor control, it can complete complex vector calculations at high speed and accurately to achieve complete decoupling of the motor.

 

B. Using advanced motor model algorithm, 0.5Hz can output 150% rated torque, stable speed accuracy 0.5%, speed regulation range 1:100.

 

3. Built-in PID can easily form a closed-loop control system, suitable for process control systems such as pressure and flow.

 

5. The standard RS485 interface supports MODBUS communication protocol, and can communicate with the host computer such as touch screen, PLC, etc.

 

6. Complete protection measures can protect nearly 20 kinds of faults such as overvoltage, undervoltage, input phase loss, output phase loss, overload, overheating, overcurrent, external terminal failure, communication failure, current detection error, motor tuning failure, etc. , Higher reliability.

 

Concluding remarks

 

Easy-drive ED3100 series inverters have excellent performance in oilfield water injection applications, environmental protection and energy saving; good constant pressure water supply control greatly improves oil production efficiency.