Abstract
For the traditional reciprocating pumping unit, it generally starts at the bottom dead point with full load and is accelerated when starting and decelerated when stopping, which not only requires great energy from the motor but also impact on the output torque of motor. In order to tackle the above problems, we propose an energy-saving smooth reversing pumping system, which could store the energy in deceleration by making use of springs, and the stored energy could be reused in acceleration after reversion. This novel system targets to make the motor starting with light load, which could reduce the fluctuation in motor torque, decrease the starting time. In this article, a dynamic model and an efficiency model are established to compute the polished rod load dynamometer card and efficiency of the pumping unit. It is shown that the installed springs could help to reduce the impact on the system when reversing, and significantly decrease the energy consumption. In addition, we set up the real pumping system with load test system to verify the effectiveness of the model establishment. Through the experiment, the proposed pumping system could save energy up to 9.204% as compared to the traditional reciprocating pumping system.
Highlights
With the development of oilfield exploitation, artificial lifting methods by mechanical equipment are becoming increasingly prevalent.1 In oilfield production, mechanical lifting equipment is one of the major energyconsuming equipment
The 85% of lifting system used in the oilfield production is rod pumping system, which is composed of pumping unit, pumping rod, and motor
In section ‘‘System setup and schematic design,’’ we provide the system setup and schematic design of the pumping system
Summary
With the development of oilfield exploitation, artificial lifting methods by mechanical equipment are becoming increasingly prevalent.1 In oilfield production, mechanical lifting equipment is one of the major energyconsuming equipment. The motor will rotate in reverse direction, and the pumping unit is on the down stroke, which makes the counterbalance move upward.
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