RU57541U1 - DEVICE FOR HEATING OIL IN WELLS - Google Patents

Abstract

The utility model relates to induction heating devices and can be used to heat well fluids, in particular, paraffin oil and highly viscous mixtures directly in wells. The inventive device for heating oil is characterized in that it is made in the form of a cylindrical tubular body oriented in the direction of the length of the well, with removable covers on the end sides. Seals are installed in each of the covers. A hermetically separable element of the current lead to the connecting electric cable is installed in the upper case lid, and on its external surface there is a holder. The end of the holder is a tubing coupling (tubing) on a flange through which mounting bolts are passed and holes for current leads are made. A conical sleeve is placed on the underside of the housing, which is pressed by the tubing coupling. Inside the housing, coaxially to it, there is a section of the tubing suspension pipe, on the outer surface of which along the pipe are spaced apart induction cylindrical coils brought to the connecting cable. The dimensions of the pipe in cross section at a section of the device are adapted to interface with tubing suspension pipes for transporting oil from a well outside the device for heating.

Description

The utility model relates to induction heating devices and can be used to heat well fluids, in particular, paraffin oil and highly viscous mixtures directly in wells.

Known devices for heating a fluid induction-immersion type: [RU 2002383; RU 2002384; SU 1811038; SU 4602140; FR 2565059]. All of them are characterized by the presence of an induction winding, in the cavity of which a magnetic circuit is placed. All devices of this type are enclosed in a housing, usually vertically elongated. It is a secondary short-circuited winding and is a heating element.

Also known as "Heater for an oil well" [patent RU 2249672]. It contains a current source made in the form of a three-phase or two-phase alternating current source, or a single-phase alternating current source, or a direct current source, an output cable, as well as a heating cable. T conductor veins of the heating cable at one end are interconnected, and the other ends are connected to the current source through the output cable.

However, the use of this heater is inefficient in use, since the pipe is locally heated at the point of contact of the cable. In addition, there are large losses of thermal power for heating the borehole fluid located in the annulus between the pipe and the production casing of the well.

The closest analogue of the claimed device is "Downhole electric heater" [ed. testimonial. SU 1703810]. It contains: a current lead with a tubular body installed underneath it, with a long-length heating element placed in a spiral on its surface with an increase in the helix pitch from the end of the body towards the current lead and openings in the upper part of the body. The downhole electric heater is equipped with a throttle washer with holes, a pump with a drive located inside the upper part of the casing, and additional holes are made in the lower part of the casing where the throttle washer with holes is rigidly mounted. The holes in the upper part of the housing are made at the pump intake.

The objective of the utility model is to increase the efficiency of the device for heating oil by increasing the area and uniformity of heating.

The essence of the claimed utility model. A device for heating oil in wells is characterized in that it is made in the form of a cylindrical tubular body oriented in the direction of the length of the well with removable covers on the end sides, with a hermetically separable current lead element to the electrical connection cable in the top cover, seals in each of the covers and a holder mounted on the outer surface of the top cover, the end of the holder is a tubing sleeve (tubing) on a flange through which epezhnye bolts and holes are made under the current leads, with the bottom side of the housing arranged cone sleeve is urged clutch tubing; inside the casing, coaxially to it, there is a section of the tubing suspension pipe, on the outer surface of which along the pipe there are spaced induction cylindrical coils output to the connecting cable, and the pipe dimensions in cross section at the device’s section are designed to interface with the tubing suspension pipes for oil transport from the well outside the device.

In addition, the pipe, including at the device site, is made of steel.

A device is also claimed in which the cylindrical tubular body is made of heat and pressure resistant material.

In addition, the device for heating oil in wells has safety stops on the outer surface of the housing for an additional connecting electrical cable.

The technical result of the utility model consists in a constructive technique - the allocation of a section from a transport pipe, on which a heater is formed, capable of playing the role of a device for heating a fluid (oil) passing from a well and simultaneously acting as a transport passage for a produced product. It is directly on the pipe with oil passing from the well that a device is formed for heating it in the form of induction cylindrical coils located on it. The lengthy section in the form of a heating device is a pipe with a length of 7-10 meters with a sufficient area of uniform heating on all sides of the pipe. Heat loss is minimized, since the contact of the heater with the passing fluid is direct from the inside of the pipe.

The inventive device for heating oil in wells is illustrated with the help of figure 1 and figure 2, which depict, respectively, the device in general form and in the form installed in the well for operation, where elements 1-12 indicate the elements of the inventive device, positions 13 -16 - devices and elements necessary to illustrate the operation of the claimed device:

1 - housing;

2 - pipe section from the tubing suspension;

3 - induction cylindrical coils;

4 - detachable current lead element;

5 - connecting electric cable;

6 - holder;

7 - tubing coupling;

8 - cover;

9 - a sealant;

10 - bolted connection;

11 - sleeve;

12 - conical sleeve;

13 - fixing collars;

14 - control station;

15 - submersible pump;

16 - production casing.

The inventive device, shown in figure 1 and figure 2, consists of thermobar-oil-resistant metal housing 1. It is designed to protect against mechanical damage, from environmental influences, at the same time it is an external magnetic circuit and has a streamlined shape, which allows it to freely lower it in the pump assembly -compressor pipes into the well to the desired depth. Inside the housing 1, a steel section of the pipe 2 from the tubing suspension bracket is coaxially located, onto which three inductive cylindrical coils 3 of copper rectangular wire with fiberglass insulation are placed, arranged in series and spaced apart at a certain distance in order to eliminate the mutual influence of induction cylindrical coils 3, connected through the three-phase sealed detachable element of the current lead 4 located in the top cover 8, the connecting electric cable 5 (type KPBP - to Abel submersible armored flat) to a three-phase electric network. The detachable element of the current lead 4 is sealed and allows for quick connection of the current leads of the heater, which end the induction cylindrical coils 3, with the current cores of the connecting electric cable 5. The housing of the heater 1 is sealed on the end sides by removable covers 8 in the form of flanges, sealed with gaskets 9 from oil and petrol resistant rubber compound. A holder 6, which is a sleeve 7 on the flange, is screwed onto the pipe section 2, coaxially located to the housing 1, from the upper end. From the side of the flange to the holder 6 through the cover 8 and the seal 9 by a bolt connection 10 into the sleeve 11, which is connected to the housing by a threaded connection, the housing 1 is fastened. The rubber products are sealed by installing the gaskets 9 and are tightened in the lower and upper parts of the bolt heater connections 10 located evenly through 45 ° around the circumference of the housing. The coupling 7 is fixed from the lower end by means of a threaded connection. Through the conical sleeve 12, the coupling 7 compresses the housing 1. A collapsible design

the device provides for the rapid replacement of rubber products, which will allow reuse of this device.

If there is a lack of heating power, you can use a modular design of two or more of the claimed devices for heating oil. Along the housing 1, protective limiters can be provided for laying one or two supply cables in them to power the submersible pump and, if necessary, cables for the second such device of the invention located below.

The operation of the device for heating oil is provided using a power source located above the surface, outside the well. When AC voltage is supplied through the connecting electric cable 5 and the detachable element of the current input 4 to the induction cylindrical coils 3 in section 2 from the tubing suspension, induced alternating magnetic fluxes induce currents that can be considered as eddy currents or as a short circuit current of the secondary winding of a transformer having one turn . This current heats section 2 of the tubing suspension, from which heat is removed from the flowing oil to be heated. Using the ground control station 14, electrical parameters are monitored for each phase of the device, it is turned off in case of overheating, short circuit current leakage, these parameters are recorded with a specified time interval, and the oil temperature at the well exit is also monitored. All of the above data can not only be recorded on the surface of the Earth, but also, if necessary, transmitted via the existing communication channels to the office of oil producing enterprises.

Example.

In the manufacture of a device for heating oil in a well, a tubing section 73 of 7-10 m length was used, with a wall thickness of 5.5 mm. The heater body is made of tubing 114 with a wall thickness of 6 mm. The turns of the primary winding are made of rectangular copper wire PSDKTL brand, size 2.36 × 5.6 mm. The parts to be manufactured are the holder, the conical sleeve, the sleeve screwed into the housing, the current lead, the covers are made of X40 steel. Sealing rubber products - from high temperature, oil and petrol resistant rubber compound. As the insulating material used fiberglass and fluoroplastic. The control device that provides the specified operating parameters is the controller "Electon". This device for heating oil in a well has shown good results at a pressure of 12 MPa and has been tested since the second half of 2005 at one of the oil producing enterprises of the Tyumen region.

Claims (4)

1. A device for heating oil in wells, characterized in that it is made in the form of a cylindrical tubular body oriented in the direction of the length of the well with removable covers on the end sides, with a hermetically separable current lead element to the electrical connection cable in the top cover, with seals in each of the caps and the holder mounted on the outer surface of the upper cover, the end of the holder is a tubing coupling (tubing) on the flange through which is passed fixing bolts and holes for current leads are made, on the bottom side of the case there is a conical sleeve pressed by the tubing sleeve, inside the body, coaxially to it, there is a pipe section of the tubing suspension bracket, on the outer surface of which along the pipe there are spaced apart induction cylindrical coils brought to connecting cable, and the pipe dimensions in cross section at the device site are configured to interface with tubing suspension pipes for transporting oil from the well outside the device. 2. A device for heating oil in wells according to claim 1, characterized in that the pipe, including at the device site, is made of steel. 3. The device for heating oil in wells according to claim 1, characterized in that the cylindrical tubular body is made of heat and pressure resistant material. 4. The device for heating oil in wells according to claim 1, characterized in that it has safety limiters for an additional connecting electrical cable on the outer surface of the housing.