Long-stroke direct-drive pumping unit with dual-brake and balance weight fall prevention functions

Abstract

The invention discloses a long-stroke direct-drive pumping unit with dual-brake and weight fall prevention functions. A motor of a power unit drives a built-in reducer installed in a drum to make the drum rotate forwardly and reversely. The pumping unit can be either braked by the motor or an electric hydraulic brake. A wellhead belt fixedly wound on the drum bypasses a guide drum capable of moving forward and backward to be connected with a wellhead polished rod. A weight belt fixedly wound on the drum in the opposite direction is connected with a fall prevention weight box in a rack. A wellhead polished rod load and a weight form scale balance. The pumping unit of the invention has the characteristics of being simple in form of transmission, safe and reliable, and the like.

Description

technical field [0001] The invention relates to the field of oil production equipment in oilfields, in particular to a long-stroke direct-drive pumping unit with double braking and counterweight anti-falling functions. Background technique [0002] With the increase of oilfield development time, the formation pressure gradually decreases, and the artificial lift dominated by the beam pumping unit plays a dominant role. The motor is decelerated by a two-stage hard tooth surface reducer, and drives the crank connecting rod mechanism to complete the up and down stroke work. Due to the long transmission path and the low efficiency of the crank-link mechanism, the beam pumping unit consumes a lot of energy and has a large volume. [0003] In recent years, engineers and technicians have developed different types of tower pumping units. "Outer rotor permanent magnet motor cluster well pumping unit" (publication number CN202707001U), "motor for tower pumping unit and its tower pum...

AI Technical Summary

Problems solved by technology

"Outer rotor permanent magnet motor cluster well pumping unit" (publication number CN202707001U), "motor for tower pumping unit and its tower pumping unit" (publication number CN101719702), "ultra-low speed and high torque special-shaped motor drag tower Stand-type high-efficiency and low-consumption intelligent pumping unit” (public number CN1840904B) all need to adopt special motors, which have the disadvantages of few standard parts, high cost, and difficulty in replacement and maintenance; “a tower type digital pumping unit” (public number CN2511789Y ) adopts the form of ordinary asynchronous motor driving the reel after being decelerated by the hard-tooth surface reducer, and the top structure size and weight are large

At the same time, the above-mentioned pumping unit has no auxiliary braking mechanism and counterweight anti-falling mechanism, and the safety is relatively poor.

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