Method for lowing energy-consumption and increasing output by changing elasticity modulus of pumping rod and special apparatus

Abstract

The invention relates to a method, which makes use of modifying the elastic modulus of sucker rod to decrease energy consumption and improve the output and is applied in the oil field manual lifting area. It mainly aims at lower rod pump efficiency and system efficiency of prior pumping well, bigger energy consumption transferred to ground pumping unit by the pumping rod in the rod pumping system and bigger influence to underground pump efficiency. It is characterized in that a sucker rod buffer made of elastic components is used to change the elastic modulus of sucker rod so that the natural frequency of sucker rod satisfies the formula (1) and then it can add the over-stroke to the utmost extent, improve the output, save energy and decrease consumption.

Description

Technical field: [0001] The invention relates to an energy-saving and consumption-reducing technology for pumping unit wells in the field of oilfield artificial lift, in particular to a method for reducing energy consumption and increasing production by changing the elastic modulus of a sucker rod string. Background technique: [0002] Because the load of the pumping unit is an alternating load, the pumping efficiency and system efficiency of the existing pumping unit in the oil field are relatively low. The average pumping efficiency is only about 45.2%, and the average system efficiency is only 24%. One of the influencing factors is the existence of inertial and vibration loads. Specifically, in the pumping unit system, the 1000-meter-long sucker rod string is deformed during the downhole operation, so there are inertial and vibration loads, resulting in a large loss of energy transmitted by the ground pumping unit, which is not conducive to the downhole pumping. The pump...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of large energy loss of the pumping unit and low pump efficiency of the downhole pump due to the inertial and vibration loads existing in the downhole operation of the sucker rod string, the present invention provides a A method that can increase production and a buffer specially designed for the implementation of the method. After the method is implemented, by installing the buffer at an appropriate position on the sucker rod, the natural frequency of the longitudinal vibration of the sucker rod string can be close to the required pumping rate. The operating frequency of the pump can be adjusted to realize the overstroke of the oil well pump, so as to achieve the purpose of saving energy and reducing consumption

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