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Oil and Gas Extraction

The Application Of Replacing Traditional Beam Pumping With Linear Motor Pumping Unit

Oil and Gas Extraction View volume: 40

Ⅰ.Overview

A beam pumping unit is an oil extraction device. During operation, rotational power from the motor is transmitted to the crank-connecting rod mechanism after being reduced in speed via a gearbox. This mechanism converts the rotational motion into the vertical movement of the horsehead — a motion resembling repeated human kowtows, earning the unit its common nickname: "kowtowing machine".

Connected to the polished rod and sucker rod, the horsehead drives the plunger of the downhole oil pump to move up and down, continuously pumping crude oil out of the wellbore. By contrast, a linear motor operates on the principle of directly converting electrical energy into linear motion.

Ⅱ. Core Advantages of Replacing Beam Pumping Units with Linear Motor Pumping Units

1. Eliminating Mechanical Transmission Loss

Linear motors directly drive the oil pump, eliminating beam pumping unit mechanical transmission components, such as the reducer and the crank-connecting rod, to cut energy-transmission steps, boosting system efficiency by over 30%. Traditional beam pumping units only achieve an average operating efficiency of 25% due to mechanical friction and mismatched loads. In contrast, linear - motor systems can adjust power in real time to match the actual load.

2. Solving the Problem of Energy Feedback

During the downstroke of a beam pumping unit, the motor operates in a power-generating state. This necessitates the configuration of additional braking resistor to dissipate the regenerated electrical energy—resulting in an energy consumption increase of 5% to 15%. In contrast, the linear motor convert electrical energy directly into mechanical energy, which eliminate the issue of energy feedback, thereby simplifying power grid management and reducing energy waste.

Ⅲ.Frequency Inverter & Specifications

Use frequency inverter YDS8045 T4N to drive 37kW linear motor.

Ⅳ. On-Site Running Situation

Terminal Definition

All requirements from customer are met in sequence: no-load test (inverter auto-operation logic is normal), load test (water pump pressure meets customer’s requirements during operation), and 1,500m cable connection between motor and inverter (output reactor installed as required).

Position, speed, and current waveforms of the inverter during loaded operation

V. Conclusion

After passing in-factory tests, the customer will deploy small batches to end-user sites (e.g., large oilfields). With sensors real-time monitoring downhole parameters like pressure and flow rate, motor power and motion curves are automatically adjusted to achieve refined oil extraction under the "one well, one strategy" approach.

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