RU27145U1 - BAR PROTECTOR CENTER - Google Patents

Abstract

A rod protector-centralizer comprising a cylinder (boss) with centering bushes and metal inserts with a higher electrochemical potential with respect to the tubing string, characterized in that the rod protector-centralizer is capable of radial and axial movement along the rod body and equipped with an internal pressed-in sleeve made of a material with anti-friction properties.

Description

BAR PROTECTOR CENTER

The utility model relates to the oil industry, in particular to the protection of tubing from corrosion, tar and paraffin deposits and the destruction of the walls of tubing and couplings of pump guards against mutual friction from each other.

A device for protecting the string of pump rods and the inner surface of the tubing from corrosion, resin-paraffin deposits and mutual abrasion, a scraper-centralizer made in the form of a cylinder (boss) with spiral channels for the passage of fluid (see, N. USA No. 350060, class, E 218 17/10 op, 1971) 1,

The disadvantage of this device is the lack of properties that prevent the deposition of hydrates and paraffin on the walls of the tubing and increased wear of the tubing due to abrasive inclusions in the body material of the scraper-centralizer, included to prevent wear of the scraper-centralizer itself.

The closest in technical essence to the utility model is a tread-centralizer made of metal having a higher negative electrochemical potential with respect to the pump rod and fixed on the last cast (see, Natent RF №2047741 Е21В 41 / 02op, 10.11.1995) 2

JOOJ114 23

 41/02, 37/02

The drawback of the juvenile gfotekgor — the centralizer, which is rigidly mounted on the body of the grips — is the increased youthful tubing, and the rods for dual and highly distorted wells

The objective of the proposed utility model is to reduce the rate of wear of tubing, couplings and rods in conditions of increased concentration of corrosive components in the well fluid, reduce friction on the inner surface of EPEST and increase the durability of downhole equipment.

This object is achieved in that the tread-centralizer, which includes a cylinder (boss) with centering sleeves, inserts from a material with a higher negative electrochemical potential in relation to the tubing string, is additionally equipped with inner bushings of antifriction (cast iron, fluorogshast-4) material with the possibility radial and axial movement along the body of the rod.

In FIG. The device of the protector rod centralizer is shown, section.

A protector-centralizer is placed on the column of pump rods, consisting of a cylinder with inserts2 made of a material with a higher negative electrochemical potential with respect to the tubing string, centering sleeves (3) made of a polymer material with high dielectric and mechanical (abrasion) properties. The bar tread-centralizer is made with the possibility

radial and axial movement along the body of the rod and is equipped with an inner sleeve 4 of antifriction material.

The device operates as follows.

In an oblique and curved well, when the column 1 moves and bending forces occur, the rod string self-centers within the guaranteed radial clearance of the rod tread-centralizer, significantly reducing stresses in the tubing body from the bending of the pump rods.

The lower position of the rod tread-centralizer is limited by the position of the rod coupling, the cylinder (boss) provides the effect of tread protection, preventing cracking of the tubing metal and rods under the action of alternating and periodic dynamic load due to fatigue failure. The centering sleeves reduce the attrition of the sucker rod string on the sucker rods, which means the string is worn out due to wear. The sleeve 4, made of antifriction material and pressed into the tread-centralizer prevents its wear on the body of the rod.

Using the proposed utility model to prevent electrochemical and mechanical wear of the tubing will not only increase the time between failures of oilfield equipment, but also prevent the deposition of hydrates and paraffin on the inner surface of the tubing.

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1. US patent No. 350060, CL E 218 17/10 op. 1971.

2. RF patent No. 2047741, cl. E 21B 41/02 O11ublikL0.11L995.

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Literature:

Claims (1)

A rod protector-centralizer comprising a cylinder (boss) with centering bushings and metal inserts with a higher electrochemical potential with respect to the tubing string, characterized in that the rod protector-centralizer is capable of radial and axial movement along the rod body and equipped with an internal pressed-in sleeve made of a material with anti-friction properties.