RU2745952C1 - Device for mechanical cleaning of the inner cavity of the bottom-hole pump - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry and is intended for use in the repair and assembly of a bottom-hole pump (hereinafter – BHP). It is applicable on the BHP assembly site for wells of simultaneously separate operation. The device for mechanical cleaning of the inner cavity of the bottom-hole pump includes a supporting hollow cylindrical case, cleaning and guiding elements. As a cleaning element, an impeller is installed on one side of the case by means of a cutoff clutch. Brushes made of polyamide fibers with the possibility of rotation are rigidly mounted on the impeller shaft. Polyamide centralizers are evenly placed along the length of the case as guide elements. On the other side, the case is connected to the compressor through a cutoff clutch with a hose and a nipple.

EFFECT: increased reliability of the device and efficiency of its maintenance, increased service life, reduction of material costs while improving quality of complex cleaning of the inner surface of the BHP cylinder.

1 cl, 2 dwg

Description

The invention relates to the oil and gas industry and is intended for use in the repair and assembly of a sucker rod pump (SRP). Applicable at the site of the sucker rod pump assembly for wells of simultaneous-separate operation.

When changing the design of sucker rod pumps, additional holes are drilled, for example, when assembling sucker rod pumps for simultaneous separate production. In the process of drilling holes, chips enter the inner cavity of the cylinder (other mechanical impurities may also enter). To eliminate the risk of the plunger jamming in the cylinder, cleaning is carried out without damaging the inner surface of the cylinder.

There are devices for cleaning the inner surface of pipes, which are bulky, including brushes, powered by an electric or hydraulic drive, requiring a specially equipped area.

A device for cleaning the inner surface of a pipeline is known, containing a cylindrical body mounted with the possibility of rotation with cuffs fixed to it, metal brushes and permanent magnets mounted in two ring-shaped holders (and.with. No. 1632527, IPC В08В 9/04, publ. 07.03.1991 ). The holders are installed coaxially with respect to the piston body on ribs made of non-magnetic material, and each permanent magnet is placed in the holder so that one pole of it is directed towards the piston body, and the other towards the piston periphery, while the magnet poles of the second holder are directed opposite to the poles of the first and windows are made in the housing between the holders to remove magnetic contaminants.

The disadvantages of the known device are the complexity of the design and the opposite arrangement of magnets, which can lead to the magnetization of individual particles from ferromagnetic materials to the wall of the SRP cylinder, and the presence of metal brushes will lead to the formation of scratches on the inner surface (mirror) of the SRP cylinder.

A device for cleaning the inner surface of a pipeline is known, containing a cylindrical body installed with the possibility of rotation around its axis with cuffs fixed on its front and rear parts, between which there are annular belts with magnets on the body, on the surface of which metal brushes are located (A.S. No. 1771834, IPC В08В 9/04, publ. 30.10.1992). The magnets in the belts are oriented with the poles of the same name towards the metal brushes, while the device is equipped with additional scrapers of elastic material placed between the belts and mounted tangentially to the body.

The disadvantages of the known device are that its use is aimed at eliminating only metallic impurities, the inner cavity is not cleaned of dust and non-magnetic materials, and the use of metal brushes and scrapers will lead to the formation of scratches on the inner surface (mirror) of the SRP cylinder, which is unacceptable. The device provides cleaning of the inner surface of one standard size of pipes.

The closest is a device for mechanical cleaning of the internal cavity of a sucker rod pump, including a supporting hollow cylindrical body, cleaning and guiding elements (patent RU No. 2721319, publ. 18.05.2020). The cleaning element is installed on the body and contains a sprayer with nozzles, front and rear cuffs with cleaning brushes and a magnetic belt. The guide element is evenly spaced along the length and perimeter of the body and contains external centering spring-loaded rollers. The spray nozzles are evenly spaced around the perimeter and directed to the walls of the inner cavity of the pump cylinder. The body is designed to be connected to a hollow pusher for injecting air into the nozzles through the body. The centering rollers are made of polyamide material. The cleaning brushes are made of polyamide fibers. The body is designed to be connected to a hollow pusher, for example, by means of a nipple for injecting air into the nozzles through the body. The hollow pusher is connected to the body, for example, with a quick disconnect (union, nipple, nut) and with a compressor for supplying air to the atomizer.

The disadvantages of the device are:

- firstly, the frequent replacement of the springs of the centering rollers due to a decrease in their elasticity during the operation of the device, as well as the locking fastening of the cleaning brushes due to its weakening;

- secondly, the low quality of cleaning the cavity of the sucker rod pump, since the design of the sprayer located at the beginning of the device designed for blowing out impurities does not allow increasing the air pressure for blowing out adhered mechanical impurities from the inner wall of the sucker rod pump;

- thirdly, the low quality of cleaning the sucker rod pump cavity, since two pairs of brushes installed behind the sprayer push mechanical impurities during operation of the device, which leads to damage to the inner wall of the sucker rod pump cylinder (scratching);

- fourthly, an increase in the consumption of funds for the purchase of a magnet with high magnetic energy required to remove metallic impurities;

- fifth, low efficiency of device maintenance, associated with the duration of assembly and disassembly of the threaded connection of the spray gun to the body.

The technical objectives of the invention are to improve the reliability of the device and the efficiency of maintenance of the device, increase its service life, reduce material costs while improving the quality of the integrated cleaning of the inner surface of the sucker rod pumping pump cylinder.

Technical problems are solved by a device for mechanical cleaning of the internal cavity of a sucker rod pump, including a supporting hollow cylindrical body, cleaning and guiding elements.

The novelty is that, as a cleaning element, an impeller is installed on one side of the housing using a burst coupling, brushes made of polyamide fibers are rigidly installed on the impeller shaft with the possibility of rotation, polyamide centralizers are evenly placed along the length of the housing as guide elements, and on the other side of the housing connected to the compressor through a burst coupling with a hose and a nipple.

FIG. 1 shows the device in working order.

FIG. 2 schematically shows a centralizer.

The device for mechanical cleaning of the inner cavity of a sucker rod pump includes a supporting hollow cylindrical body 1 (Fig. 1) with a diameter of 20-25 mm and a length of 6 m, cleaning and guiding elements. As a cleaning element on one side of the housing, an impeller 2 is installed using a breakaway coupling 3. The impeller is an impeller consisting of an impeller enclosed in a flattened housing 4 and a shaft that transfers rotational energy from the blades to the shaft of the cleaning brushes. The rotation of the blades is carried out under the action of the air flow forced by the compressor through the housing 1. Brushes 6 of polyamide fibers are rigidly mounted on the impeller shaft 5, which provide cleaning of the inner surface of the pump cylinder from dust and small debris. For example, Lessmann rammed cylindrical brushes with polyamide bristles are used. The diameter of the brushes is equal to the inner diameter of the SRP cylinder (38, 44, 57, 70, 95 mm). The impeller transmits rotation from its output shaft to the brushes. The breakaway coupling is made of a quick-disconnect connection (ISO A 7241 standard) for hydraulic systems produced, for example, by HERMES LLC. Polyamide centralizers 7´, 7´´ are evenly placed as guiding elements along the length and perimeter of the body 1. Centralizers are made in molds from high-strength glass-filled polyamide with a central axial channel with a diameter equal to the outer diameter of the device body 1, and a through slot along the generatrix of the centralizer for placement on the body 1. Centering ribs are symmetrically placed on the outer surface of the centralizer (Fig. 2) with a diameter smaller than the inner one. the diameter of the sucker rod pumping pump cylinder by 1 mm. Centralizers, for example, produced by LLC "TMS-group". On the other hand, the housing is connected to the compressor (not shown in the drawing) through a breakaway coupling 8 with a hose and a nipple 9, a hollow pusher.

The proposed device for mechanical cleaning of the internal cavity of the sucker rod pump eliminates the need for frequent replacement of the springs of the centering rollers as well as the locking fastening of the cleaning brushes; improves the quality of cleaning the sucker rod pump cavity, since the impeller design allows to increase the air pressure for blowing out adhered mechanical impurities from the inner wall of the sucker rod pumping pump by 1.5 times, as well as by eliminating damage to the inner wall of the sucker rod pumping pump cylinder (scratching); eliminates the expense of funds for the purchase of a magnet with high magnetic energy; increases the efficiency of device maintenance by reducing the duration of assembly and disassembly of the device.

The device for mechanical cleaning of the inner cavity of the sucker rod pump operates as follows.

The device is assembled in the following sequence: from one end to the body 1 with a diameter of 25 mm and a length of 6 m, centralizers 7 are installed evenly along its length and perimeter at a distance of 1.5 m from each other. The outer diameter of the centralizer is 43 mm. At the other end of the housing, the housing 4 of the impeller with the shaft 5 and three rotating brushes 6 are mounted using a burst coupling 3. The diameter of the impeller wheel is 30 mm, which ensures the direction of the air flow to the inner surface of the SRP cylinder. The outer diameter of the circle of the brushes is chosen equal to the inner diameter of the rod pump cylinder (for example, 44 mm). From the opposite side, a hose from the compressor, including a hose and a nipple 9, is connected to the housing through a bursting coupling 8.

The inner surface of the sucker rod pumping pump cylinder is cleaned in the following sequence. The compressor is started, the device is inserted into the inside of the sucker rod pump cylinder and the device is moved in the cylinder. When the device is installed in the sucker rod pump cylinder, air from the compressor is fed through the housing 1 to the impeller housing and then, due to the air pressure, the impeller 2 rotates with the shaft 5 on which the brushes are installed 6. The rotation of the brushes cleans the cylinder from mechanical impurities, and the air escaping from the holes in the impeller housing, blows mechanical impurities out. The alignment of the device during operation in the SRP cylinder is carried out with polyamide centralizers. The body 1 is pushed along the inner cavity of the sucker rod pumping pump until the second brush 6 comes out.

Disassemble the device in reverse order.

The device allows to increase the reliability and efficiency of the device maintenance, to increase its service life, to reduce material costs while improving the quality of the complex cleaning of the inner surface of the sucker rod pumping pump cylinder.

Claims (1)

A device for mechanical cleaning of the inner cavity of a sucker rod pump, including a supporting hollow cylindrical body, cleaning and guiding elements, characterized in that an impeller is installed as a cleaning element on one side of the body using a burst coupling, brushes made of polyamide fibers are rigidly mounted on the impeller shaft with the possibility rotation, as guiding elements along the length of the body, polyamide centralizers are evenly placed, and on the other side, the body is connected to the compressor through a burst coupling with a hose and a nipple.

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