SU968339A1 - Apparatus for preventing salt deposition in pumping pipes - Google Patents

Description

The invention relates to the oil and gas industry, in particular, to devices for preventing salt deposits in the tubing string.

A device for preventing the deposition of salts is known, which contains magnets that create a magnetic field and are placed in housing 1.

The disadvantage of this device is the meshing of the processing of the medium by the magnetic field.

The closest technical solution to the invention is a device for preventing the deposition of salts in pump-compressor tubes, containing a set of permanent magnets of annular section, mounted on a hollow magneto-dielectric connecting rod 2.

A disadvantage of the known device is that the gas-liquid flow does not intersect the magnetic field in a direction perpendicular to the magnetic power lines, as a result of which the desired processing effect is not achieved. In addition, there is no preliminary magnetic treatment of the gas-liquid flow by an alternating magnetic field, which increases the effect of

normal to the gas-liquid flow of the magnetic field.

The aim of the invention is to increase the effectiveness of preventing the deposition of salts by allowing the gas-liquid flow to be pre-treated with an alternating magnetic field.

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The goal is achieved by the fact that the hollow magnetodielectric connecting rod is made in. the middle part is perforated, moreover

At the upper and lower ends of the rod | with symmetrically placed permanent ring magnets with poles of the same name, and in the middle perforated part of the hollow rods are permanent ring magnets with different name poles, while

20 the space between them is filled with granulation filler.

In addition, the granular filler is made of a ferromagnetic material.

25

FIG. 1 shows a device for preventing salt deposits; in fig. 2 - lock cargo.

The device consists of a sub 1 for connection to an elevator

30 pipe string, bushings 2, shear;

pins 3, rinse pipe 4, hollow rod 5, permanent magnets with the same directional poles of the antimagnetic ring 7, stiffness element 8 with a ferromagnetic ring 9 of the hollow slotted rod 10, permanent magnets II, granular filler 12, protective high-permeable shell 13, conical sleeve 14, coupling 15 and the sealing ring 16

The assembly of the device is as follows.

B. The transducer 1 inserts the sleeve 2 and secures it with shear pins 3. A washing pipe 4 is attached to the sleeve 2. Magnets with identical direction poles are put on the hollow rod 5 with the space between them once with rings 7 of material c / x, 1, made, for example, of an alloy D16T, and a stiffness element 8 made of spring steel with a ferromagnetic ring 9. Permanent magnets 11 with opposite poles (N and-S) g are put on the hollow slotted rod 10 between which the grain is laid The filled filler 12 made of ferromagnetic material, for example metal balls pre-coated with epoxy resin, which together with the magnets 11 is enclosed in a highly gas-permeable casing 13- made of polymeric grids (for example, capron, polyester, fiberglass, etc.). In the lower part of the device, a tapered sleeve 14 is mounted to hold a special locking weight, and a sleeve 15, the lower end of which is sealed with a ring .16.

The device is lowered into the well on a tubing string. When the device is lowered, it is contaminated with sludge and scale, which can lead to the formation of a plug — and to the device being stuck in the well (i.e., an accident). To ensure trouble-free descent to the bottom of the well into the interior of the hollow rod 5, a flushing pipe 4 is enclosed, by means of which periodic cleaning of the device from sludge and scale is carried out.

After installing the device in the selected interval, the well is mastered and through the flushing pipe 4 it is worked up to the FULL cleaning of the bottomhole zone from the solution filter, mechanical impurities and fluid, i.e. to the cleaning gas, the magnetic system located on the hollow slotted rod 10 is not involved in the operation, which prevents the highly permeable structure from contamination. After cleaning the well into the tubing string, a special locking weight is dropped (FIG. 2), which consists of sliding racks 17 and a solid metal rod. The locking weight overlaps the flow area of the sleeve 2 (Fig. 1) and then overpressures the foam (20-25 kgf / cm) and cuts the pins 3. The sleeve 2, together with the locking weight and the flushing pipe 4, goes down and sits in the coupling seat 15, The earrings 17 (Fig. 2) are opened in different directions and enter under the protrusion of the cone 14, which prevents pushing out the cargo and the flushing pipe 4 in the opposite direction, during the operation of the well. After that, the device itself is put into operation.

The principle of operation of the device is as follows.

The flow of gas or liquid entering (from the top and bottom simultaneously) through the annular gap between the tubing and the production string is pre-processed by an alternating magnetic field created by the magnets 6. The flow enters the magnetic field normally directed to the gas direction. flow, forming in the region of annular permanent magnets 11 with a granular filler located between them 12. When a gas-liquid flow passes through a highly permeable surface 13, it is divided into elementary streams, which are additionally treated with a magnetic field in the pores of the elements of the granular filler 12.

The permanent magnets 11, with the help of the rigidity elements 8, glitch onto the production string and create a single magnetic system, which contributes to an increase in the Magnetic flux in the working zone of the filter. Further, through the slots of the hollow rod 10, the gas-liquid flow along. lift pipe enters the surface.

The salt contained in the gas-liquid stream, after treatment with a magnetic field, crystallizes in the form of tiny particles that no longer adhere to the walls of the tubing, and the flow of the t: s to the surface, where they are caught by the cleaning separators.

The design characteristics of the device (the length of the hollow slotted rod, the particle size of the granular filler, the diameter of the magnetic rings, the mass of stiffeners) are calculated based on the gas flow velocity. Compliance with these design features of the device ensures the reliability and efficiency of its work at the bottom of the well to prevent scaling in the elevator pipe.

The proposed device effectively prevents the deposition of salts in tubing pipes by pre-treating the gas-liquid flow with ring magnets with unidirectional poles and perpendicular intersection of magnetic field lines in the middle perforated portion of the hollow rod, resulting in salt crystallizing in the form of tiny particles that are not adhere to the walls of tubing pipes, and they are carried out to the surface by a flow, and also makes it possible to eliminate the flushing of wells Spring water to eliminate the plugs due to crystallization of salts from the gas-liquid stream in the form of the smallest particles carried to the surface.

Claims (2)

1. An apparatus for preventing salt deposition in tubing pipes, comprising a set of permanent magnets of annular cross section mounted on a hollow magnetodielectric connecting rod, characterized in that, in order to increase the effectiveness of preventing salt deposition by allowing the pre-treatment of the gas-liquid flow with an alternating sign magnetic field, hollow magnetodielectric connection rod is made in the middle part of the perforated, and in the upper and lower the ends of the rod symmetrically arranged annular permanent magnets with like poles, and in the middle perforated part there are permanent ring magnets with opposite poles and the space between them is filled with granular filler. 2. The device according to claim 1, about aphid-ay shch.e e so that the granular filler is made of ferromagnetic material. Information sources, taken into account in the examination 1. Author's certificate of the USSR 336274, cl. C 02 B 9/00; 1970. 2. USSR author's certificate number 271456, cl. E 21, 37/00, 1962.