I. Introduction

 

After the oilfield is put into development, as the exploitation time increases, the energy of the oil layer itself will continue to be consumed, resulting in a continuous decrease in oil layer pressure, a large amount of underground crude oil degassing, viscosity increase, oil well production is greatly reduced, and even the injection and production will be stopped, causing underground A large amount of dead oil cannot be recovered. In order to make up for the underground deficit caused by crude oil production, maintain or increase the pressure of the oil layer, achieve high and stable production of the oil field, and obtain a higher recovery rate, it is necessary to inject water into the oil field. Therefore, most of my country's oilfields are developed by water injection, which is particularly important for low-permeability oilfields. In onshore oilfields, the water injection system is an important part of the production system. It is responsible for stabilizing oil and water, increasing production and high production, and maintaining formation energy. At the same time, water injection itself is also a big energy consumer. According to statistics, water injection power consumption generally accounts for 33%---56% of the total power consumption of oil fields.

 

2. Advantages of ED3100 series inverter used in oilfield water injection wells

 

(1) Maintain a constant water pressure;

 

(2) The control system can be operated manually/automatically

 

(3) Multiple pumps automatically switch and run;

 

(4) The system sleeps and wakes up. When the outside world stops using water, the system is in sleep state and wakes up automatically when there is water demand;

 

(5) Adjust PID parameters online;

 

(6) Pump set and line protection detection alarm, signal display, etc.　 　

 

The actual pressure of the pipe network is compared with the given pressure after feedback. When the pressure of the pipe network is insufficient, the inverter increases the output frequency, the speed of the water pump increases, and the water supply increases, forcing the pressure of the pipe network to rise. On the contrary, the speed of the water pump slows down, the water supply volume decreases, and the pressure of the pipe network drops to maintain constant pressure water supply.

 

(7) Accumulated electricity saving rate is high throughout the year.

 

Conclusion:

 

With the growth of the national economy, the exploitation of oilfields has also become an important part of the national economy. It is essential to make full use of existing resources to realize mechanical automation and energy-efficient production. Therefore, the application of frequency conversion will become more and more extensive.