Split motor-drived vertical-pipe reciprocating chain pumping unit

Abstract

The invention is a two-piece electric-machine drive vertical-tube type reciprocating-chain oil pumping unit, a beam-free one composed of wellhead large four-way, wellhead short section, vertical tube, electric machine, chain wheel and oil pumping rod. The large four-way is fixed at the wellhead and set with wellhead small four-way at the center; the well short section situated on the large four-way; the vertical tube situated on the short section, the top of the vertical tube set with a cap, and a ring balance weight slipping over the periphery of the vertical tube and able to slide upwards and downwards along the vertical tube; the electric machine is a two-piece permanent-magnet low-speed synchronous one, fixed on the cap and the output shaft supported on the right and left pieces by bearings; the chain wheel connected to the center of the output shaft by bond and able to rotate forwards and reversely under the electric machine drive; one end of the chain linked with the balance weight, and the other one linked with the upper end of the oil pumping rod round the chain wheel; the lower end of the oil pumping rod passing through the small four-way to link up with the underground reciprocating pump.

Description

technical field [0001] The invention relates to a beamless pumping unit for oil production in an oil field, in particular to a standpipe type reciprocating chain pumping unit driven by a split motor. Background technique [0002] Press, the pumping unit that is used for oil field oil production is mainly divided into two categories, namely beam pumping unit and non-beam pumping unit. The beamless pumping unit has the advantages of good balance effect and easy realization of long stroke, so it is widely used in the field of deep well oil production. The beamless pumping units in the prior art mainly include chain pumping units, belt pumping units and other types of linear drive pumping units. Their common feature is that the pumping units are installed on the side of the oil production wellhead, so the whole machine is The lateral force not only makes the structure of the pumping unit complicated and heavy, but also makes it more difficult to manufacture and install. In add...

AI Technical Summary

Problems solved by technology

The beamless pumping units in the prior art mainly include chain pumping units, belt pumping units and other types of linear drive pumping units. Their common feature is that the pumping units are installed on the side of the oil production wellhead, so the whole machine is The lateral force not only makes the structure of the pumping unit complicated and heavy, but also makes it more difficult to manufacture and install

In addition, due to the high speed of the motor, it must be decelerated by a reducer, resulting in a long transmission line, many transmission parts and a relatively complicated stress on the reversing mechanism. Therefore, the failure rate of the whole machine is high, the maintenance workload is heavy, and the service life is also limited. influences

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