Patent Application
20250223963
The present invention relates to equipment for oil extraction and can be used in well multistage centrifugal pumps with high-speed drives, based on an oil-filled submersible electric motor with a heat exchanger, hydro protection, and a compensator.
Submersible high-speed centrifugal pumps can operate in conditions where both the pump mechanical section with stages and the drive part with an electric motor (oil-filled type) are completely submerged at a great depth in the well. Such pumps must operate for a long time without maintenance. For this, in such pumps, the drive part with an electric motor is made with a heat exchanger and hydro protection, consisting of a protector and a compensator. Hydro protection is designed to protect submersible oil-filled electric motors from the penetration of well fluid into their internal cavity, as well as to compensate for oil leakage and thermal changes in its volume during the operation of the electric motor. It is also necessary to provide for the removal of a significant amount of heat generated because of mechanical and electrical losses in the electric pump drive. For this, a dielectric cooling liquid (dielectric oil) is used, which circulates in the electric motor with a heat exchanger. The cooling liquid absorbs heat from the motor and transfers it to the surrounding liquid in the well. Design solutions of the pump drive, ensuring efficient heat removal from electric motors when the pump installation operates in the well, reduce the likelihood of drive failures and, accordingly, increase the working resource of the pump installation. Increasing the service life of the pump installation is one of the main factors ensuring the stability of oil production and reducing the cost of maintaining the well stock.
The drawings presented herein are for illustrative purposes only and do not limit the scope of the claims. Rather, the drawings are intended to help enable one having ordinary skill in the art to make and use the claimed inventions. The drawings are drawn to scale.
A submersible pump drive with a heat exchanger, comprising a casing, an oil-filled electric motor, a heat exchanger connected to it, located below or above the electric motor, a compensator installed in the heat exchanger and hydraulically connected by an oil channel with the oil-filled cavity of the electric motor, wherein the drive has channels providing oil circulation in the drive for heat exchange between the oil and the well fluid, characterized in that the diaphragm compensator is located outside the main zone of the heat exchanger and is removed beyond the heat exchanger.
A detailed description will now be provided. The purpose of this detailed description, which includes the drawings, is to satisfy the statutory requirements of 35 U.S.C. § 112. For example, the detailed description includes a description of inventions defined by the claims and sufficient information that would enable a person having ordinary skill in the art to make and use the inventions. In the Figures, like elements are generally indicated by like reference numerals regardless of the view or FIGURE in which the elements appear. The figures are intended to assist the description and to provide a visual representation of certain aspects of the subject matter described herein. The figures are not all necessarily drawn to scale, nor do they show all the structural details, nor do they limit the scope of the claims.
Each of the appended claims defines a separate invention which, for infringement purposes, is recognized as including equivalents of the various elements or limitations specified in the claims. Depending on the context, all references below to the “invention” may in some cases refer to certain specific embodiments only. In other cases, it will be recognized that references to the “invention” will refer to the subject matter recited in one or more, but not necessarily all, of the claims. Each of the inventions will now be described in greater detail below, including specific embodiments, versions, and examples, but the inventions are not limited to these specific embodiments, versions, or examples, which are included to enable a person having ordinary skill in the art to make and use the inventions when the information in this patent is combined with available information and technology. Various terms as used herein are defined below, and the definitions should be adopted when construing the claims that include those terms, except to the extent a different meaning is given within the specification or in express representations to the Patent and Trademark Office (PTO). To the extent a term used in a claim is not defined below or in representations to the PTO, it should be given the broadest definition persons having skill in the art have given that term as reflected in at least one printed publication, dictionary, or issued patent.
Certain specific embodiments of methods, structures, elements, and parts are described below, which are by no means an exclusive description of the inventions. Other specific embodiments, including those referenced in the drawings, are encompassed by this application and any patent that issues therefrom.
In the illustrative embodiment of the invention an improved design of a submersible pump drive with an oil-filled electric motor and a heat exchanger is provided, which is used in well multistage centrifugal pumps. Such improvement is aimed at increasing the reliability of the pump drive during long-term operation and is especially relevant for high-speed submersible pump installations with a valve drive, operating at great depths with a high temperature of well fluid. The device operates as follows. The electro-insulating filling liquid-oil 1 in the hermetic internal cavity of the operating electric motor 2 absorbs the heat generated by it and removes it through the metal walls of the casing and circulation channels into the well fluid. Oil flows form a heat exchange circuit connecting the electric motor 2 and the heat exchanger 3. The circulation of oil 1 is provided by the pump 4, the inlet channel 5 of the rotor 6, connected to the central channel 7 of the heat exchanger 3, and ensuring the supply of oil to the channels 8 of the stator 9 of the electric motor 2, in which the oil 1 absorbs the heat of the stator 9 and transfers it to the helical channels 10 of the heat exchanger 3. In parallel, heat through the wall of the second casing of the heat exchanger 11 is transferred to the well fluid located in the open cavity 18 of the heat exchanger 2, then through the technological channels 12, the oil moves to the central channel 7 of the heat exchanger and moves in the direction of the central channel 5 of the rotor 6 and further in the direction of the discharge holes 13 of the rotor 6 to the reception area 14 of the labyrinth-screw pump 5. Thus, a circulation circuit of heat-mass transfer is formed in the internal hermetic cavity of the submersible drive. The central channel 7 is connected to the cavity 15 of the diaphragm 24, which provides pressure equalization between the internal cavity of the electric motor and the pressure in the well due to the elasticity of the diaphragm 24 and the channel 16, as well as compensation for thermal expansion of the oil through the valve 23. Additionally, the internal cavity 18 of the casing 26 of the submersible drive connected to the well fluid 25 by channels 17 and 20, is equipped with a spiral ribbon radiator 19, through which heat is actively transferred from the oil in channel 7 to the well fluid, thereby intensifying the heat-mass transfer between the oil 1 and the well fluid 25.
In a particular illustrative embodiment of the invention a submersible pump drive with a heat exchanger, comprising a casing, an oil-filled electric motor, a heat exchanger connected to it, located below or above the electric motor, a compensator installed in the heat exchanger and hydraulically connected by an oil channel with the oil-filled cavity of the electric motor, wherein the drive has channels providing oil circulation in the drive for heat exchange between the oil and the well fluid, characterized in that the diaphragm compensator is located outside the main zone of the heat exchanger and is removed beyond the heat exchanger.
In another particular illustrative embodiment of the invention the drive, characterized in that a spiral radiator is created in the through inter-tube channel of the heat exchanger for the flow of well fluid, tightly connected to the nozzle of the internal channel of the heat exchanger, while its winding provides the ascent of the thermal flow of well fluid upwards the drive and increases the heat removal surface by more than 2 times.
In another particular illustrative embodiment of the invention drive, characterized in that in order to intensify the circulation of the filling liquid, the forced heat exchange pump is made labyrinth-screw in the form of a rotor on the shaft of the electric motor and a sleeve with a multi-start screw thread of different directions.
In another particular illustrative embodiment of the invention the drive, characterized in that in order to increase the operability of the electric motor during intensive operation of the labyrinth-screw pump, its shaft is connected to a two-sided thrust sliding bearing of hydro protection.
The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense. It will be evident that additions, subtractions, deletions, and other modifications and changes may be made thereunto without departing from the broader spirit and scope of the inventions as set forth in the claims set forth below. Accordingly, the inventions are therefore to be limited only by the scope of the appended claims. None of the claim language should be interpreted pursuant to 35 U.S.C. 112 (f) unless the word “means” is recited in any of the claim language, and then only with respect to any recited “means” limitation.
This patent application claims priority from U.S. provisional patent application Ser. No. 63/617,789 filed on Jan. 5, 2023, by Shakirov and entitled, “A Submersible Pump Drive with Heat Exchanger,” which is hereby incorporated by reference in its entirety.
| Number | Date | Country | |
|---|---|---|---|
| 63617789 | Jan 2024 | US |
