Application of the ES Series in Servo Direct-Drive Systems for Oilfield Pumping Units

Pumping unit is a kind of machinery and equipment for oil exploitation, commonly known as "knocker". The oil is sent out of the well through pressurization. When the pumping unit is stroking upward, the elastic contraction of the tubing moves upward, driving the mechanical unplugging oil extractor to move upward and hitting the sliding sleeve to generate vibration; At the same time, the forward check valve is closed, the reducing piston assembly blocks the oil. When the pumping unit is down stroke, the tubing elastically extends and moves down, driving the mechanical unplugging oil extractor to move down and hitting the sliding sleeve to generate vibration; At the same time, the reverse check valve is partially closed, and the reducing piston assembly still blocks the annular oil channel of the oil jacket, making the area below the reverse check valve form a high pressure zone. This movement generates a reverse impact on the oil flow channel in the formation.

Construction Plan

Pumping unit is the main energy consuming equipment in each oil field. Calculated according to the capacity of 30KW for each motor (in fact, 37KW and 45KW motors are mostly used in the oil field, and 55KW and 75KW motors are partially used), the total installed capacity is more than 2000000 KW. The basic requirements of the pumping unit on the motor control system are: large-scale, stable and reliable stepless speed regulation; It has obvious power saving effect; Less maintenance Good stability.

Oil-field oil production plants are important industries in China. There are more than 6000 oil wells in Dongying. North China Oil Field is mainly located in Hebei Province, but there are more in Karamay, Xinjiang. Before the oil production plants, asynchronous motors with belt and frequency converter were mainly used. The energy consumption of asynchronous motors was high, and belt maintenance was very troublesome. The belts were stopped and replaced twice a year, resulting in high unsafe cost. There are many kinds of frequency converters, all of which are imported from China, and the maintenance and after-sales are very troublesome. At present, there are many RTU types for the upper computer, and various brands are very complicated due to the purchase by the bid winner.

Scheme for Shenzhen Epsivo ES500A VFD and One 2000NM60RPM Servo Direct Drive Motor

Product features:

• The built-in application macro debugging of the frequency converter is simple, and the efficient software algorithm does not over-voltage in the downlink and deceleration.

• Compatible with various RTU communications.

• Easy hoisting and simple installation.

• Low-speed and high-torque direct-drive motor with high efficiency and energy conservation, environmental protection and maintenance-free.

Direct drive scheme

A 2000N37kw60rpm synchronous direct-drive motor and a 45KW frequency converter with a mixer are used to replace the asynchronous motor with a frequency converter and a reduction gearbox with a belt, reducing the failure rate of the reduction gearbox and the belt, reducing the frequency of changing the belt twice a year and making the maintenance easier. The energy saving rate of multiple meters tested is about 25% because the configuration and working condition of the equipment are different.