Five anti-oil pipes and short connections

Abstract

The invention belongs to the field of oilfield oil extraction equipment, and particularly relates to a five-prevention oil pipe and a short joint. The five-prevention oil pipe comprises an oil pipe body and a coupling which are connected through an oil pipe thread, a composite wear-resistant layer is arranged on the inner side of the end of the oil pipe body, inner diameter of the composite wear-resistant layer is equal to that of the oil pipe body, and the composite wear-resistant layer is formed by well mixing ethylene-tetrafluoroethylene copolymer and brass fiber; the coupling is of a splitstructure and is composed of upper, middle and lower portions, namely an upper locking ring, a coupling body and a lower locking ring, the upper locking ring and the lower locking ring are adsorbed on the coupling body through strong magnets respectively, and the coupling body and each of the upper locking ring and the lower locking ring are matched through a diagonal plane. The composite wear-resistant layer formed by compositing the ethylene-tetrafluoroethylene copolymer and the brass fiber is arranged at the end of the oil pipe body, so that wear resistance of the end of the oil pipe whichis most prone to wear is improved remarkably, and service life of the oil pips is prolonged.

Description

technical field [0001] The invention belongs to the field of oil production equipment in oil fields, and in particular relates to a five-proof oil pipe and a short connection. Background technique [0002] Oil pipe or oil pipe short (oil pipe short is a short oil pipe of non-standard length, which is only different in length compared with standard oil pipe), [0003] At present, the oil field has entered the stage of high water cut development, the wellbore condition and the properties of the produced fluid have undergone great changes, the working environment of the rod pump system has gradually deteriorated, the degree of eccentric wear of the rod and pipe has been aggravated, and the sucker rod breakage and tubing leakage have occurred frequently. Through the tracking and analysis of field operation of eccentric wear wells, it is found that the eccentric wear of oil wells has the following characteristics: most of the eccentric wear wells have the most obvious signs of ec...

AI Technical Summary

Problems solved by technology

The existing tubing couplings do not have the function of anti-backup. In this case, in order to prevent the tubing string from being pulled back and breaking off at the tubing coupling, the tubing string can only be rotated clockwise at the wellhead instead of counterclockwise. to rotate

However, the reality that the tubing cannot rotate counterclockwise seriously hinders the design direction of downhole tools, and makes many downhole tools complex.

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