RU22307U1 - MAGNETIC LIQUID TREATMENT DEVICE - Google Patents

Description

111 I

g B - s 02 F 1/48

MAGNETIC PROCESSING DEVICE

The utility model relates to the oil industry, in particular, to devices for magnetic fluid treatment in wells equipped with electric centrifugal pumps (ESPs), in order to prevent asphalt-resin-paraffin deposits (ASIO) in downhole equipment, as well as to reduce the corrosive activity of produced fluid.

It is known that the installation location of a device for magnetic fluid treatment in a well affects the performance of such a device.

Magnetic treatment of the borehole fluid when placing the device under an ESP type pump or a screw pump is ineffective due to the inability to eliminate the negative consequences of turbulization of the fluid flow in the borehole pump working chamber (see ed. Certificate of the USSR No. 1 130 537, class C 02 F 1/48, dated 1983)

Placing the device for magnetic fluid processing above the pump provides effective processing of the well fluid, however, it has limitations in application due to the transverse overall dimensions, which lead to complications during the descent of equipment, in particular, mechanical violations of the integrity of the cable supplying the pump motor are possible.

A device for magnetic fluid processing, including a ferromagnetic body in the form of a pipe, a magnetic system consisting of permanent magnets with an axial magnetic field in

LIQUIDS

the working channel and attached to the extraneous surface of the housing, as well as a ferromagnetic casing located outside and hermetically covering the magnetic system (see application WO No. 9511 198, class C 02 F 1/48, publ. 1995). The known device can be installed in the well above the submersible pump.

However, this known device also has the same limitations for use in wells equipped with ESPs, due to the large transverse overall dimensions. In addition, with a large diameter of the working channel in the device, the magnetic system is remote from the central axis of the working channel, which leads to a decrease in the uniformity of the magnetic field in the cross section of the working channel and, therefore, to a decrease in the efficiency of magnetic processing of the liquid.

The technical problem to which the proposed utility model is directed is to reduce the transverse overall dimensions of the device for magnetic fluid treatment installed above the ESP, while ensuring the duration of contact of the well fluid with the magnetic field and operational reliability, as well as increasing the efficiency of magnetic treatment by increasing the degree of uniformity magnetic field in the cross section of the working channel of the device.

The stated technical problem is solved due to the fact that in the known device including a ferromagnetic casing in the form of a pipe, a magnetic system mounted on the outer surface of the casing, made of permanent magnets with an axial magnetic field in the working channel of the casing, and a casing tightly enclosing the magnetic system, the casing is proposed perform consisting of three interconnected nozzles, while the Central nozzle

 n y

fill with a diameter smaller than the diameter of the end pipes and place the magnetic system on the central pipe.

The diameter of the central pipe is less than the diameter of the end pipe by at least 30%.

The connection between the nozzles may be threaded.

End pipes are made with a diameter equal to the diameter of the tubing.

Thanks to the proposed design of the device for magnetic processing of the borehole fluid, the danger due to the limited diameter of the casing in the well (including from various growths and curvatures of the borehole) is eliminated, since the maximum overall diameter of the proposed device for magnetic processing of the fluid does not exceed the overall dimensions of the pump casing ( ESP).

The proposed transverse overall dimensions of the device were established experimentally, taking into account two conflicting conditions. On the one hand, the diameter of the central nozzle must be reduced so as to ensure the placement of a magnetic system under the casing, which could provide the optimal magnitude of the magnetic field strength in the working channel (without worsening the magnetic field). On the other hand, the diameter of the central pipe must be made as large as possible to create the optimal flow rate of the well fluid in the working channel, which ensures the necessary duration of interaction (contact) of the well fluid with the magnetic field along the working channel of the device.

magnetic treatment of the borehole fluid by increasing the degree of uniformity of the magnetic field in the cross section of the working channel.

The implementation of the end pipes in a housing with a diameter larger than the diameter of the central pipe ensures structural rigidity, the reliability of the device in the tubing string, and the ability to hold the weight of the tubing and pump located below the string.

The essence of the utility model is illustrated by the drawing, which shows the inventive device.

A device for magnetic processing of liquid contains a ferromagnetic housing 1 in the form of a pipe with a working channel 2, a magnetic system 3 made of permanent magnets with the formation of an axial magnetic field, and placed outside and covering the hermetically magnetic system 3 of the ferromagnetic casing 4. The housing 1 consists of three connected between each pipe 5,6 and 7, the End pipes 5 and 7 are made with a diameter equal to the diameter of the tubing, and the Central pipe 6 is made with a diameter smaller than the diameter of the end pipes 5 and 7, and the diameter of the central pipe 6 is less than the diameter of the end pipes 5 and 7 by at least 30%. The nozzles 5,6 and 7 of the housing 1 are interconnected by a thread by means of couplings 8. All connections are sealed.

The magnetic system 3 is mounted on the external surface of the central pipe 6 of the housing 1. The housing 1 with the magnetic system 3 is placed in a ferromagnetic casing 4; In order to ensure tightness along the ends of the casing 4, conical flanges 9 are installed, which are put on the end pipes 5 and 7 until they stop in the couplings 8 and are hermetically fixed on them and in the casing 4. The outer diameter of the casing 4 does not exceed the overall diameter of the pump casing (ESP) .

End pipes 5 and 7 can be made of short pieces of standard tubing-2 and have a standard thread on the outer end sections for mounting in a tubing string.

The device for magnetic treatment of the wellbore fluid as part of the tubing string is lowered into the casing so that the device is located directly above the ESP, or the device can be installed below the expected sediment deposition area by 100-150 m.

The borehole fluid supplied to the tubing string by a pump (ESP) enters the device for magnetic processing.When the fluid passes through the working channel 2 of the housing 1, it is treated with an axial magnetic field, as a result of which it is activated to prevent the formation of deposits on the surface of the downhole equipment.

By reducing the diameter of the central pipe 6 of the housing 1, which forms the working channel 2 of the device, the degree of uniformity of the magnetic field in the cross section of the working channel 2 is increased, thereby ensuring effective processing of the well fluid. A decrease in the radius of the working channel from 2 in the known device to 1.5 in the inventive device leads to an increase in the magnetic field along the axis of the working channel from 1050 e to 1400 e, which indicates an increase in the degree of uniformity of the magnetic field in the working channel and a corresponding increase in the efficiency of the device .

Laboratory studies and field tests of the device confirmed the existence of a relationship between the degree of uniformity of the magnetic field in the cross section of the working channel of the device body and the efficiency of magnetic processing of fluids.

corrosion, and the deposition rate of paraffin deposits after processing fluids in the proposed device.

Change in the efficiency of magnetic processing of a liquid depending on a change in transverse dimensions

working channel

Note: 1. At the wall of the working channel But 2300 e.

2, - The efficiency of magnetic processing of fluids is taken as a unit.

The data in the table confirm that a decrease in the diameter of the central nozzle leads to an increase in the degree of uniformity of the magnetic field strength in the cross section of the working channel and to an increase in the efficiency of processing fluids.

The device is easy to manufacture and operate.

August 2, 2001

Table

Claims (4)

1. A device for magnetic fluid treatment, comprising a ferromagnetic housing in the form of a pipe, a magnetic system mounted on the outer surface of the housing, made of permanent magnets with an axial magnetic field in the working channel of the housing, and a casing tightly enclosing the magnetic system, characterized in that the housing consists of three interconnected nozzles, while the central nozzle is made with a diameter smaller than the diameter of the end nozzles and the magnetic system is placed on the central nozzle.  2. The device according to claim 1, characterized in that the diameter of the central pipe is less than the diameter of the end pipe by at least 30%.  3. The device according to claim 1, characterized in that the connection between the nozzles is made by thread. 4. The device according to claim 1, characterized in that the end pipes are made with a diameter equal to the diameter of the tubing.