A high-strength flexible oil pumping polished rod

Abstract

The invention aims to provide a high-strength flexible oil-pumping polished rod which comprises threaded joints, a connecting rod and a pin shaft, wherein interface plug-in sheets are arranged at both the two ends of the connecting rod, the number of interface plug-in sheets at one end is an odd number, and the number of interface plug-in sheets at the other end is an even number; the threaded joints include an even threaded joint and an odd threaded joint, a connecting thread is formed at one end of the even threaded joint, interface plug-in sheets in even number are arranged at the other end of the even threaded joint, a connecting thread is formed at one end of the odd threaded joint, interface plug-in sheets in odd number are arranged at the other end of the odd threaded joint, the even threaded joint is engaged with the odd number of interface plug-in sheets of the connecting rod, and the odd threaded joint is engaged with the even number of interface plug-in sheets of the connecting rod; pin holes are formed in the threaded joints and the plug-in sheets of the connecting rod respectively; both the assembly of the even threaded joint and the connecting rod and the assembly of the odd threaded joint and the connecting rod are connected together by being arranged in the pin holes through the pin shafts. The high-strength flexible oil-pumping polished rod has the characteristics of flexibility, convenience for wellhead polished rod sealing, high strength and long service life.

Description

Technical field [0001] The invention relates to an oil pumping unit, in particular to a polished rod of an oil pumping unit. Background technique [0002] In my country's oilfield oil extraction technology, mechanical oil extraction is the most important method of oil extraction. In particular, rod pump oil extraction equipment is the most common application. Rod pumping systems include pumping units, rod pumps, and rod string systems. The sucker rod string system includes polished rods, sucker rods, weighted rods, etc. The polished rod is mainly used to connect the pumping unit and the downhole sucker rod. It is a smooth and rigid structure located at the wellhead and cooperates with the corresponding sealing device to achieve pumping. The wellhead seal in the oil stroke. [0003] With the continuous exploitation of oil fields, the number of low-yield oil wells has increased. In order to reduce the energy consumption of machinery, new pumping units such as single-well double-str...

AI Technical Summary

Problems solved by technology

Although the original oil pumping rod can solve the problem of sealing and has the characteristics of high strength, it is not flexible and cannot be used for new pumping units

Ordinary chains, wire ropes, etc. are used as sucker rods. Although they are flexible, they have the problems of wellhead sealing and low strength.

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