RU2346146C1 - System meant for magnetic processing of fluid in well equipped with electric centrifugal pump with submersible electric motor (versions) - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: group of inventions refers to oil industry, and namely to systems intended for magnetic processing of formation fluid of various watercut in the well. System includes the device used for magnetic processing of flow-through fluid with a tube through which the produced fluid flow flows, and a magnetic block which is enclosed in a tight housing and installed on the tube. Device is located below the submersible electric motor and made as connected thereto by means of a connection as a perforated branch pipe. On the one end, the latter is connected to submersible electric motor, and on the other end - to the tube of the above device. According to the first version, the opposite tube end located at a distance from the branch pipe is equipped with a disk-shaped centralising interlocking device, and diameter of its cross section approximately corresponds to diameter of the well casing. According to the second version, the branch pipe is enclosed in a tight housing-screen with its simultaneous covering the submersible electric motor and partial covering the above casing.

EFFECT: improving efficiency of protection against deposits at any watercut of the produced fluid.

14 cl, 2 dwg

Description

The invention relates to the field of oil production, in particular to two versions of a system for magnetic treatment of formation fluid of various water cuts in a well equipped with a submersible pump installation, which includes an electric centrifugal pump (ESP) and a submersible electric motor (SEM), and can be used with a mechanized pump oil production in order to prevent asphaltene-tar-paraffin deposits (AFS) at the ESP and PED nodes and the walls of tubing (tubing), as well as to reduce corrosion activity and the produced fluid.

During the passage of reservoir fluid in the well due to cooling, the deposition of salts and asphaltene-tar-paraffin substances (ASSP) occurs on the deep oil well equipment and on the walls of the tubing. In this case, the overall performance of the submersible pump installation decreases.

Magnetic treatment provides intensive crystallization of paraffin in the volume of the processed fluid, which significantly reduces their deposits on the working surfaces of a submersible electric centrifugal pump, the inner walls of the tubing string.

Known submersible pump installation containing a pump with two magnetic devices (RF Patent No. 2183256, class. E21B 43/00, publ. 2002). One of the magnetic devices is located below the pump, and the other is above it. Magnetic devices are made in the form of magnetic separators, which allow magnetic separation of solid particles in the oil stream.

However, the specified well-known submersible pumping unit equipped with the indicated magnetic devices does not protect the SEM from ASPO.

Also known is a system for magnetic fluid treatment in a well equipped with a sucker rod pump, at the entrance of which a magnetic device is placed that creates a magnetic field for processing the produced fluid and is formed by a bipolar unipolar magnetic system with radial magnets and internal axial and external axial magnetic circuits (RF Patent No. 2091565 , CL ЕВВ 43/00, publ. 1997). Also, the known prior art system further comprises another magnetic device located on the rod string above the downhole pump.

A disadvantage of the known system is the design complexity and the impossibility of its use in wells with ESP.

There are a number of devices for magnetic processing of fluid of a flowing type, installed inside the tubing of a well and incorporating a pipe through which the flow of produced fluid flows, and a magnet block enclosed in a hermetically sealed casing in the form of ring magnets mounted on the pipe and providing magnetization of the flow flowing inside the pipe produced fluid (RF Patent ПМ №39133, RF Patent №2127708, RF Patent №2242433). These design features form the basis of all these known devices for magnetic fluid processing, as well as a number of other devices. Their difference from each other lies in the additional introduction into the design of elements, for example, in the form of ferromagnetic rings mounted from one end without a gap at the ring magnets, with different distances between them, in the form of shunts with which the outer poles of at least two ring magnets are shunted, in the form of a spiral installed in a pipe, and so on. This affects the degree of effectiveness of magnetic processing (magnetizing the flow of fluid flowing through the pipe) in various conditions. But all these indicated technical solutions can be selected as a prototype for the proposed system, since, based on the totality of the signs, their bases and the magnetization principle are the closest.

The disadvantage of these known solutions is that they do not provide protection against the AFS of the structural components of the submersible pump installation (ESP and SEM) (known devices are usually installed in the zone of presumptive deposition of the AFS, and this is usually higher than the submersible pump installation), as a result of which the whole specified installation may fail over time.

In addition, all of these known devices cannot be installed in the well under the SEM without a certain structural refinement.

The single technical result achieved by the proposed variants of the inventions is to increase the effectiveness of protection against paraffin deposits for any water cut in the produced fluid of both downhole equipment, in particular, an electric centrifugal pump and a submersible electric motor, and tubing walls, while excluding magnetization of the SEM.

The specified technical result is achieved by the proposed system for magnetic fluid treatment in a well, equipped with an electric centrifugal pump with a submersible electric motor, including a flow-type magnetic fluid processing device installed in the well, including a pipe through which the flow of produced fluid flows and a magnetic enclosure sealed by a casing a unit mounted on the specified pipe and providing magnetization of the flowing fluid flowing through the pipe, while According to the invention, according to the first embodiment, the device for magnetic processing of liquid is placed below the SEM submersible electric motor and made docked with it by means of a connecting unit, in which the system contains a perforated pipe connected from one end to the SEM, and from the other end to the pipe of the specified device, the opposite end of this pipe, remote from the aforementioned perforated pipe, is equipped with a centralizer-blocker of a disk type, the cross-sectional diameter of which is approximately but corresponds to the diameter of the casing of the well in which the device for magnetic fluid treatment is installed, and according to the second embodiment, the device for magnetic treatment of fluid is placed below the submersible electric motor of the SEM and is connected to it by means of a connecting unit, in which the system contains a perforated pipe connected to one the end with the SEM, and from the other end with the pipe of the specified device, while the perforated pipe is sealed by a hermetic casing-screen with simultaneous overlap by removing the PED and the partially mentioned pipe.

In both cases, in the predominant embodiment, the perforated pipe is made at least 300 mm long.

Perforations are placed evenly on the perforated nozzle.

Perforation holes are placed on the perforated nozzle unevenly grouped into local groups.

The area of the perforations of the perforated pipe approximately corresponds to the cross-sectional area of the pipe of the device for magnetic processing of liquid.

According to the first embodiment, as a centralizer-blocker, the system comprises a disk-umbrella made of elastic material.

Also, according to the first embodiment, the perforated nozzle is connected to the pipe of the device for magnetic fluid treatment through the coupling, and to the PED directly or through research technological equipment.

As research technological equipment, for example, a telemetry system is used.

According to the second variant, the perforated nozzle is connected to the pipe of the device for magnetic fluid treatment through the coupling, and directly to the PED.

In this application, the requirement of unity of invention is met, since both of the claimed options are intended to obtain a single technical result.

The specified technical result is achieved due to the following.

Due to the fact that the device for magnetic fluid treatment is located in the proposed system below the submersible electric motor, the latter, as well as the electric centrifugal pump, are protected from the precipitation of salts and paraffin deposits.

Placing the device for magnetic fluid treatment connected to the SEM by means of a connecting unit made in the form of a perforated nozzle allows washing the SEM with an already magnetized stream of produced fluid and then flowing through the ESP, which ensures that the entire design of the submersible pump unit is treated with a uniform magnetized stream, which means it increases the efficiency prevent sedimentation of ASVV at its nodes.

A disk-type centralizer-blocker (according to the first embodiment), mounted at the end of the pipe of the magnetic processing device remote from the perforated pipe and made with a cross-sectional diameter approximately corresponding to the casing pipe diameter, plays the role of a barrier and does not allow non-magnetized fluid to mix intensively with the magnetized fluid, then there is a kind of obstacle, eliminating unproductive losses of magnetized fluid. Thanks to this, a high efficiency of processing PED, ESP and tubing with this fluid is ensured.

The implementation of a perforated nozzle with a length of at least 300 mm makes it possible to reliably exclude the imposition of electromagnetic fields of a submersible electric motor and a device for magnetic processing, which means to exclude magnetization of the SEM.

The implementation of the area of the perforation holes of the perforated pipe approximately corresponding to the cross-sectional area of the pipe avoids the increased hydrodynamic pressure of the liquid on the walls of the perforated pipe, and therefore ensures the reliability of the entire system.

The supply of the proposed system according to the second embodiment with a sealed casing-screen covering the perforated pipe and covering the SEM and partially the pipe of the device for magnetic processing, allows to increase the processing efficiency by additionally eliminating the losses of the magnetized liquid and its full effect on the ESP and SEM nodes, as well as on the walls Tubing.

The claimed invention is illustrated by drawings, where in Fig.1 shows the proposed system according to the first embodiment, in Fig.2 - according to the second embodiment.

The proposed system for magnetic processing of liquid consists of a device for magnetic processing of fluid of a flowing type, a submersible motor 1 and a connecting unit - perforated pipe 2.

A device for magnetic fluid treatment necessarily includes the following structural units: a pipe 3, through which a stream of produced fluid 4 flows, a magnetic unit mounted on its outer surface, consisting of at least two permanent annular magnets 5, composed, for example, of magnetic rods or magnetic plates, the main surfaces of which are facing the axis of the pipe, due to which it is possible to magnetically affect the flow of the produced fluid 4 in the pipe 3. These magnets are covered by the hermetic adic casing 6.

As such a device for magnetic processing can be used the design of the devices described in the patents of the Russian Federation No. 39133, 2127708, 2242433 and others. The basis of all these devices is the structural units indicated above. Their difference from each other lies in the introduction of additional elements (shunts for shunting at least two ring magnets; installing ferromagnetic rings in ring magnets without a gap or with a gap, etc.), which allow changing the magnetic effect and ensuring operability in the conditions of various oil-containing produced liquids. For the proposed system, the difference in these structures does not matter, the main thing is that the magnetization of the flow flowing through the pipe 3 takes place.

In the inventive system, a device for magnetic processing of liquid is placed below the PED 1 and made docked with it by means of a perforated pipe 2 connected from one end or only directly to the PED 1 (according to the second option), and from the other end through a coupling 7 with a pipe 3 And according to the first embodiment, the specified pipe 2 can be connected to the SEM either directly or through research technological equipment, for example, through a compensator or a telemetry system. The opposite end of said pipe 3, remote from said perforated pipe 2, according to the first embodiment is equipped with a centralizer-blocker 8 of a disk type, made, for example, in the form of a disk-umbrella made of elastic material - rubber, the diameter of which approximately corresponds to the diameter of the casing 9, in which and the proposed system is hosted. Moreover, it is not necessary for the centralizer-blocker 8 to completely cover the casing space, it is enough to cover most of the cross section of the casing 9.

The pipe 3 is also equipped with a centralizer 10 for uniformly positioning the device in the wellbore when it is lowered to a predetermined depth.

In the second embodiment, the proposed system further comprises a casing-screen 11, hermetically covering the fully perforated pipe 2, PEM 1 and partially pipe 3. In this embodiment, the pipe 3 can be equipped with two centralizers 10 to avoid jamming of the system due to the skew of the device during descent.

The proposed system works as follows.

On a day surface, a device for magnetic fluid treatment is collected. Next, using a perforated pipe 2 with a length of at least 300 mm, connect this device through a pipe 3 with a PED 1. A PED 1 is connected to an ESP (not shown in the drawing). If you use the system according to the second embodiment, then this pipe 2, PED 1 and partially pipe 3 are hermetically sealed by a casing-screen 11, which can be made of metal. Perhaps a threaded connection of the casing-screen 11 with the pipe 3.

The prepared system on the tubing string is lowered into the well inside the casing 9 so that the magnetic processing device is placed below the PEM 1. The latter is put into operation, while the flow of formation fluid begins to rise up the casing 9, passes through the pipe 3, being magnetized this is placed on its surface by ring magnets 5, then passes through the perforated pipe 2, washes PED 1, enters the transport channels of the ESP, then into the tubing and then into the flow line at the wellhead.

Given that all the way up the liquid due to the proposed system rises magnetized, this provides protection against paraffin deposits of all downhole oilfield equipment, including PEM. And thanks to the design features of the claimed system provides protection for the SEM from magnetization.

As a result, the efficiency and reliability of the entire system as a whole is increased.

Claims (14)

1. A system for magnetic fluid treatment in a well equipped with an electric centrifugal pump with a submersible electric motor, including a flow-type magnetic fluid processing device installed in the well, comprising a pipe through which a flow of produced fluid flows and a magnet block enclosed in a hermetically sealed casing, installed on the specified pipe and providing magnetization of the flowing fluid flowing through the pipe, characterized in that the device for magnetic processing of the liquid once located below the submersible electric motor (SEM) and made docked with it by means of a connecting unit, in which the system contains a perforated nozzle connected at one end to the SEM and at the other end to a pipe of the specified device, while the opposite end of this pipe is remote from the aforementioned perforated nozzle is equipped with a centralizer-blocker disk type, the cross-sectional diameter of which approximately corresponds to the diameter of the casing of the well in which the device is installed A magnetic treatment liquid. 2. The system according to claim 1, characterized in that the perforated pipe is made at least 300 mm long. 3. The system according to claim 1 or 2, characterized in that the perforation holes are placed on the perforated nozzle evenly. 4. The system according to claim 1 or 2, characterized in that the perforation holes are placed on the perforated nozzle unevenly grouped into local groups. 5. The system according to claim 1, characterized in that the area of the perforation holes of the perforated pipe approximately corresponds to the cross-sectional area of the pipe of the device for magnetic fluid treatment. 6. The system according to claim 1, characterized in that the perforated nozzle is connected to the pipe of the device for magnetic fluid treatment through the coupling, and with the PED directly or through research technological equipment. 7. The system according to claim 6, characterized in that, for example, a telemetry system is used as research technological equipment. 8. The system according to claim 1, characterized in that as a centralizer-blocker, it contains a disk-umbrella made of elastic material. 9. A system for magnetic fluid treatment in a well equipped with an electric centrifugal pump with a submersible electric motor, including a flow-type magnetic fluid processing device installed in the well, including a pipe through which the flow of produced fluid flows and a magnetic unit enclosed in a hermetically sealed casing, installed on the specified pipe and providing magnetization of the flowing fluid flowing through the pipe, characterized in that the device for magnetic processing of the liquid once located below the submersible electric motor (SEM) and made docked with it by means of a connecting unit, in which the system contains a perforated nozzle connected at one end to the SEM and from the other end to the pipe of the specified device, while the perforated nozzle is sealed by a hermetically-shielded shield with simultaneous overlapping of the PEM and the partially mentioned pipe. 10. The system according to claim 9, characterized in that the perforated pipe is made at least 300 mm long. 11. The system according to claim 9 or 10, characterized in that the perforation holes are placed on the perforated nozzle evenly. 12. The system according to claim 9 or 10, characterized in that the perforation holes are placed on the perforated nozzle unevenly grouped into local groups. 13. The system according to claim 9, characterized in that the area of the perforation holes of the perforated nozzle approximately corresponds to the cross-sectional area of the pipe of the device for magnetic fluid processing. 14. The system according to claim 9, characterized in that the perforated nozzle is connected to the pipe of the device for magnetic fluid processing through the coupling, and directly to the PED.

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