Underground driving ball screw oil pumping machine

Abstract

The invention discloses an underground driving ball screw oil pumping machine, and belongs to the technical field of walking-beam-free oil pumping machines. A motor, a well mouth big cross, a ball screw drive assembly and an oil pumping rod are included. The ball screw drive assembly comprises a ball screw, a bearing, a nut, an oil pipe, a casing pipe, an upper seal sleeve, a lower seal sleeve, arotation stop guide key and a pipe column anchoring device. No components except a motor and other electric control equipment are arranged on the ground, and the purposes of safety and environment protection are achieved. The motor directly drives the ball screw, and the transmission efficiency is 95% or above. The ball screw drive assembly is arranged underground, the length of an underground shaft is large, the stroke of the oil pumping machine can be increased, and the purpose of the long stroke is achieved. The whole ball screw is protected by the seal sleeves, oil water impurities and thelike cannot enter the ball screw, and the service life of the ball screw is prolonged. Due to usage of the pipe column anchoring device, in the whole machine running process, a pipe column is free ofrotation, vibration is little, and accordingly equipment running is safe and stable.

Description

technical field [0001] The invention belongs to the technical field of beamless pumping units, and in particular relates to a downhole driven ball screw pumping unit. Background technique [0002] The pumping units used for oil production in oil fields are mainly divided into two categories, namely beam pumping units and beam pumping units without beams. The beamless pumping unit has the advantages of simple structure, convenient installation, high transmission efficiency, safety and environmental protection, so it is very popular in the field. And the ball screw pumping unit of the prior art has the following defects: [0003] 1. Since the equipment is installed on the ground, the wellhead cross is limited by the height, and the stroke of the pumping unit is also limited accordingly. The stroke cannot be designed to be too long, so the work efficiency is low. [0004] 2. Since the equipment is equipped with a balance weight, the up and down movement of the balance weight ...

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a downhole driven ball screw pumping unit, simplify the structure of the beamless pumping unit, and install the main mechanism of the transmission, the ball screw downhole, to solve the problems in the prior art The ball screw pumping unit has technical problems such as short stroke, low work efficiency, high failure rate, high manufacturing cost, and potential safety hazards

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