A pumping unit driven by a cylindrical linear motor

Abstract

The invention provides an oil pumping unit of which a sucker rod is directly driven by a linear motor. The oil pumping unit comprises a rack, a linear motor driving device, a single-stage or multi-stage telescopic machine or a gas spring energy storage device, a linear motor rotor, a sucker rod connector and the like, wherein the linear motor driving device, the single-stage or multi-stage telescopic machine or the gas spring energy storage device, the linear motor rotor, the sucker rod connector and the like are arranged on the rack. The oil pumping unit cancels the connection of elastic pieces or radial components such as hair braids, steel wire ropes and belts for an original oil pumping unit, adopts a direct balance mode, and thus cancels the reversing device (head sheave) of an existing non-beam oil pumping unit, so that the efficiency of the oil pumping unit is further improved, the height and weight of the oil pumping unit are reduced, and the service life, reliability and safety of the oil pumping unit are improved.

Description

technical field [0001] The invention belongs to the field of extraction equipment for oil, natural gas and coal bed methane, in particular to an oil pump driven by a cylindrical linear motor using single-stage and multi-stage retractable spring accumulators. Background technique [0002] The pumping unit is an important equipment for the exploitation of oil, natural gas and coalbed methane, and it is required to operate efficiently and stably for a long time under various environmental and climatic conditions. There are two types of pumping units commonly used at present, which can be divided into beam pumping units and beam pumping units without beams. The beam pumping unit is the main model currently used, but it has problems such as large speed unevenness, large starting torque, poor balance effect, difficult adjustment of stroke and stroke times, many intermediate links, and low system efficiency. In response to these problems, around the theme of high efficiency and en...

AI Technical Summary

Problems solved by technology

The beam pumping unit is the main model currently used, but it has problems such as large speed unevenness, large starting torque, poor balance effect, difficult adjustment of stroke and stroke times, many intermediate links, and low system efficiency.

In response to these problems, around the theme of high efficiency and energy saving, there have been beamless pumping units such as chain pumping units, vertical drum pumping units, belt pumping units, and linear motor pumping units. However, it has not solved the problem fundamentally, and the effect is not good; among them, the mover of the existing linear motor pumping unit is still driven by a wire rope around the pulley, that is, the sky wheel, and the sucker rod is balanced by a balance weight. However, the structure is complicated, the service life of the whole machine is shorter than that of the beam pumping unit, the efficiency is low and the safety is poor, and the potential of the linear motor drive cannot be fully utilized.

The invention patent with application number 201410229797.2 discloses a linear motor direct drive pumping unit, which mainly uses a flat-plate linear motor as the driving source. The energy storage spring is located outside the linear motor mover. The configuration relationship between the energy storage spring and the mover is yet to be determined. Improve

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