Sucker rod centering device with built-in oil guide channels

Abstract

The invention relates to a sucker rod centering device with built-in oil guide channels. The sucker rod centering device comprises a core rod and a centering sleeve, wherein the centering sleeve sleeves on the core rod; the core rod is provided with a fixed locking ring and a limiting part; the centering sleeve is located between the fixed locking ring and the limiting part; the outer diameter of the centering sleeve is smaller than the inner diameter of an oil pipe and the centering sleeve can rotate in the oil pipe; oil guide channels and oil passing grooves for connecting different oil guide channels are formed in the inner surface of the centering sleeve; and an oil through hole, which is communicated with the inner surface of the centering sleeve, is formed in the outer surface of the centering sleeve. The sucker rod centering device with the built-in oil guide channel has the beneficial effects that the contact area between the centering sleeve and the oil pipe is enlarged and mutual abrasion is reduced; the oil guide channels are formed in the centering sleeve so that the problem that a gap between the centering device and the oil pipe is small and well liquid cannot pass is solved and normal flowing of the well liquid is ensured very well; the built-in oil guide channels of the centering device are intercommunicated to the greatest extent and the flowing is smooth, and therefore, the passing of the well liquid in a contact process of the centering sleeve and the inner wall of the oil pipe can be ensured.

Description

technical field [0001] The invention relates to petroleum equipment, in particular to a sucker rod centralizer with a built-in oil guide channel. Background technique [0002] Pumping wells have always been the main method of oil production in oil fields at home and abroad. The well fluid in the oil pipe is extracted by transmitting power to the pump through the sucker rod. In order to prevent the eccentric wear failure of the sucker rod, the oil field uses a large number of sucker rod centralizers to solve the wear problem between the sucker rod and the oil pipe, especially the columnar centralizer is the most common in the oil field, and most of the centralizers are made of nylon. Such materials have limited heat resistance temperature, and the friction coefficient with the oil pipe is large, resulting in high friction resistance. Because it is easy to be worn out in a short period of time, its effect on improving the partial wear of the sucker rod is limited, and it needs...

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Problems solved by technology

[0003] However, in order to protect the sucker rod without affecting the normal flow of well fluid in the tubing, the existing sucker rod centralizer needs to leave as large an oil passage as possible between the centralizer and the inner wall of the tubing, so that The outer diameter of the centralizer is much smaller than the inner diameter of the tubing, and this will still leave a lot of room for the sucker rod to bend, which will lead to direct contact and eccentric wear between the sucker rod and the inner wall of the tubing at some positions. It makes it difficult for the centralizer to really play its role in centralizing

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