RU63433U1 - CORROSION PUMP UNIT PROTECTION DEVICE - Google Patents

Abstract

The utility model relates to the oil industry, in particular, to the protection of tubing (tubing) from corrosion damage and asphalt-resin-paraffin deposits of downhole pumping equipment of mechanized well wells. A device is known for magnetic processing of liquids, comprising a housing made of a ferromagnetic pipe, inside of which there are permanent magnets mounted on the inner surface of the housing by pouring a polymer composition. The problem being solved by 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, preventing deposits (salts, paraffins) and preventing emulsions and thereby increasing the overhaul period of the downhole equipment. The problem is solved in that the corrosion protection device of the pump installation consists of a nozzle with permanent magnets placed on its inner surface and provided with inlet holes and is connected to the tread (magnesium) by means of a coupling and an adapter through the threaded rod , dielectric centralizers fixed with a nut.

Description

The utility model relates to the oil industry, in particular, to the protection of tubing (tubing) from corrosion damage and asphalt-resin-paraffin deposits of downhole pumping equipment of mechanized well wells.

A device for protecting a string of pump rods and pump equipment from corrosion is a potentiator centralizer made of metal having a higher negative electrochemical potential with respect to the pump rod and fixed to the last cast [1].

A disadvantage of the known device, rigidly mounted on the body of the rods, is the increased wear of tubing, couplings and rods for flooded and highly curved wells and the lack of effectiveness of corrosion protection.

The closest in technical essence and purpose to the proposed model is a device for magnetic processing of liquids, comprising a housing of a ferromagnetic pipe, inside of which are placed permanent magnets fixed to the inner surface of the housing by pouring a polymer composition [2].

A disadvantage of the known device is the lack of effectiveness in preventing corrosion of downhole equipment, tubing string.

The objective of the utility model is to reduce the rate of wear of tubing, couplings and rods under conditions of increased concentration of corrosive components in the well fluid, prevent deposits (salts, paraffins) and prevent emulsions, and thereby increase the overhaul period of downhole equipment.

The problem is solved in that the installation suspended on the pump includes a device for magnetic treatment of the produced fluid, to the bottom of the body of which is additionally mounted isolated from

“sacrificial” electrode made of a material having a higher electrochemical potential relative to steel (for example, magnesium) and not having galvanic contact with elements of production and casing strings.

It is known that two metals having different electrochemical potentials create a galvanic current source in the electrolyte, whose operation affects the corrosion rate of each of these metals. A metal with a higher electrochemical potential (negative) corrodes intensely, and the corrosion rate of a metal (steel) with a large positive potential decreases or completely stops. At the same time, the magnetic device excludes the generation and accumulation of solid deposits on the surface of pumping equipment.

Fig. The inventive device is schematically depicted.

The corrosion protection device of the pump installation consists of a nozzle 1 with permanent magnets 2 located on its inner surface and provided with inlets 3 for receiving fluid from the reservoir, a tread 4 made of metal having a higher electrochemical potential, with dielectric centralizers 5 and an insulating insert 6, coupling 7, sub 8, threaded rod 9 and nut 10.

The device operates as follows.

Under the influence of an electric field created by the Fe-Mg element, water emulsified in oil and containing salt solutions decomposes as a result of secondary electrical reactions into hydrogen molecules H ₂ from H atoms at the cathode and oxygen molecules O ₂ from OH radicals at the anode. Under the influence of the created galvanic current source, conditions are created that prevent the deposition of hydrates and salts on the surface of the columns and the formation of a highly dispersed gas-liquid mixture of reduced density. On the "sacrificial" electrode - protector 4, which is the anode, oxidation reactions will occur and corrosion will occur precisely

on this electrode, providing the effect of cathodic protection and the active prevention of salt and paraffin hydrate deposits on the surface of the pump and tubing due to the magnetic treatment of the produced fluid, providing a synergistic effect.

Information sources:

1. RF patent No. 2047741 Е21В 41/02, published. 11/10/1995.

2. Testimonial. for utility model No. 38469, published. 06/20/2004.

Claims (1)

A corrosion protection device for a pump installation, consisting of a nozzle with permanent magnets placed on its inner surface, characterized in that the nozzle is provided with inlets and is connected to the tread (magnesium) via a threaded rod, dielectric centralizers and secured with a nut using a coupling and an adapter.