Oil extractor balance weight method and high efficient energy saving beam oil extractor

Abstract

The main problems of the existing beam oil extractor as the equipment consuming the largest amount of electricity in oil field are low loading rate of an electromotor, impact of electromotor negative power electricity generation on grid, short service life of the electromotor and the like. In this respect, the invention provides an oil extractor balance weight method and a high efficient energy saving beam oil extractor, the balance weight method aims at stabilizing electromotor output torque, using multiple segments of a transmission shaft of a reduction gearbox as the running shaft of serial balance block devices, arranging a weight block running body for each segment of the transmission shaft, adopting sine or cosine mathematical expressions, again taking a trigonometric series of a fixed term, and finally obtaining an equations set derived by the least square method, thereby calculating to obtain the rotation speed, initial distribution angle and weight torque of each weight block running body. The technical scheme of the invention improves the loading rate of the electromotor, effectively lowers electric energy waste, avoids the impact of negative power electricity generation mode on the electromotor and the grid, and realizes the aim of low electricity consumption with stable and reliable work.

Description

technical field [0001] The present invention relates to oil field crude oil exploitation equipment - beam pumping unit, in particular to a beam pumping unit provided with a new type of counterweight structure for energy saving and high efficiency. Background technique [0002] The beam type shaft pumping unit is the most widely used in crude oil extraction equipment in oilfields. Its structure includes a base, a bracket, a beam, a crank connecting rod drive mechanism for the beam, a donkey head and a rope hanger. Beam pumping unit, as the main mining equipment in the oil field, is also a large energy consumer in the oil field, and its electricity consumption reaches 40% of the total electricity consumption of the oil field. In addition, the average load rate of the driving motor of the beam pumping unit is only 20-30%, and the load rate of some motors will be even lower. There are practical problems of universal low efficiency and serious energy waste. In addition, when the...

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Problems solved by technology

In addition, the average load rate of the driving motor of the beam pumping unit is only 20-30%, and the load rate of some motors will be even lower. There are practical problems of universal low efficiency and serious energy waste

In addition, when the beam pumping unit is working, due to the lightening of the load during the lowering of the crank, the energy generated by the motor dragging cannot be absorbed by the load, so that the motor is in the state of power generation, and the excess energy is fed back to the power grid, causing a The impact will lead to the decline of the power supply quality of the power grid and the reduction of the power factor, and the frequent high-voltage impact will damage the motor itself, so there are technical problems such as low production efficiency, high maintenance, and large loss of enterprise costs.

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