EP4134512B1 - Dispositif de compensation de volume - Google Patents

Dispositif de compensation de volume Download PDF

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Publication number
EP4134512B1
EP4134512B1 EP22185953.1A EP22185953A EP4134512B1 EP 4134512 B1 EP4134512 B1 EP 4134512B1 EP 22185953 A EP22185953 A EP 22185953A EP 4134512 B1 EP4134512 B1 EP 4134512B1
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EP
European Patent Office
Prior art keywords
oil
chamber
heavy
volume
light
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP22185953.1A
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German (de)
English (en)
Other versions
EP4134512A1 (fr
EP4134512C0 (fr
Inventor
Ahmad Mohammadi
Andy Limanowka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Oil Dynamics GmbH
Original Assignee
Oil Dynamics GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Oil Dynamics GmbH filed Critical Oil Dynamics GmbH
Publication of EP4134512A1 publication Critical patent/EP4134512A1/fr
Application granted granted Critical
Publication of EP4134512C0 publication Critical patent/EP4134512C0/fr
Publication of EP4134512B1 publication Critical patent/EP4134512B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
    • E21B43/121—Lifting well fluids
    • E21B43/128—Adaptation of pump systems with down-hole electric drives
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B47/00—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
    • F04B47/06—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps having motor-pump units situated at great depth
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/18—Lubricating

Definitions

  • the invention relates to a system for introducing deep well pumps (also called electric submersible pumps - ESP) into a borehole in geothermal energy, with a working oil chamber filled with light oil or a light oil-like fluid and a volume compensation device.
  • deep well pumps also called electric submersible pumps - ESP
  • Deep well drilling in geothermal energy reaches great depths, which can be 3000m or more depending on the structure of the earth's mantle. This depends on the depth at which the temperature required for using geothermal energy prevails.
  • the aim is to achieve the highest possible temperatures, as this also increases the energy yield.
  • temperatures of around 170°C prevail at a depth of 3000m.
  • these temperatures also bring problems, as the pump device with drive, which is located in the borehole and is used to pump the borehole fluid, also generates heat.
  • the borehole fluid is the hot well water. The greatest heat generation occurs in the electric motor, although the highest temperatures can be reached in the axial bearing that supports the drive shaft for the pump.
  • This bearing has to absorb forces of 15 to 25 tons.
  • Such a bearing requires lubrication, for which oil is used.
  • this oil changes in volume due to temperature fluctuations caused by the heat generated when the device is in operation.
  • well water must not under any circumstances enter the working oil chamber and contaminate the light oil there.
  • the light oil should not leak into the well water.
  • This risk does not exist with heavy oil, as its consistency and high specific weight form a safe barrier even at high temperatures.
  • heavy oil is far too expensive to be used as working oil for lubrication at €600 per liter for lubricating the axial bearing and possibly filling the electric motor to drive the pump.
  • Light oil is much less expensive. The problem to be solved is therefore to prevent any well water from entering the light oil or leaking into the well water, despite the change in volume of the working oil.
  • Bellows systems are known that separate the working oil from the borehole fluid and allow a compensation of the volume change due to their elasticity, e.g. DE 1 186 141 (explanatory document ), WO 2017/096103 A1 and WO 2016/032521 A1 .
  • the PCT/US2017/064498 therefore proposes a spring-loaded piston that moves relative to a compressed gas chamber.
  • the disadvantage of this is that the compressibility of the gas limits the volume compensation, and the pressure in the gas would cause an increase in pressure in the working oil if the volume to be compensated was large.
  • a servo motor is provided that moves the piston used for volume compensation so that the working oil pressure cannot increase too much.
  • This also requires pressure detection and control.
  • Such a system is complicated, expensive and prone to failure, particularly due to the high temperatures.
  • the invention is therefore based on the object of making available a volume compensation device of the type mentioned at the beginning, which is robust even at high temperatures, is simply constructed and has a high compensation capacity.
  • a separating layer made of heavy oil or heavy oil-like fluid which can be displaced in accordance with the change in volume of the light oil or light oil-like fluid, is arranged as a volume compensation device between the light oil or the light oil-like fluid of the working oil chamber and the borehole fluid surrounding it.
  • the borehole fluid In geothermal energy, the borehole fluid is well water, but other possible uses should not be ruled out, such as in oil production, in which case it would be crude oil, for example.
  • the basic idea of the invention is to add a heavy oil layer (this always means a heavy oil-like fluid, ie with a similar specific weight) to separate the borehole fluid, usually the well water, from the light oil (this always means a fluid similar to light oil with comparable lubricating properties) in order to create a secure barrier that completely prevents well water from entering the working oil chamber, mixing with the light oil and thus contamination, or leaking into the well water.
  • a heavy oil layer this always means a heavy oil-like fluid, ie with a similar specific weight
  • the light oil this always means a fluid similar to light oil with comparable lubricating properties
  • a piston that can be moved in a cylinder could be arranged on the light oil, on which the heavy oil can be arranged above the light oil.
  • the heavy oil is immiscible with water, it can act as a movable separating layer directly adjacent to the well water if it is below the water.
  • the volume compensation device has a volume compensation chamber connected to the working oil chamber, which has a light oil region for volume compensation of the light oil and a heavy oil region with a heavy oil or a heavy oil-like fluid.
  • the boundary between the light oil region and the heavy oil region is movable and the heavy oil can flow into an expansion chamber, which has another heavy oil region that borders on a borehole fluid region, whereby the borehole fluid can flow in and out of the expansion chamber via a compensation opening.
  • the basic idea of this alternative is that there are two chambers, one for the adjoining of light and heavy oil and a separate one for the adjoining of heavy oil and well water (or another borehole fluid that is lighter than heavy oil, for example crude oil).
  • This multi-chamber system is then expediently designed in such a way that the volume compensation chamber has a connection from its light oil area to the working oil chamber and from its heavy oil area to another heavy oil area of the expansion chamber.
  • Such a multi-chamber system can be constructed in different ways: It can be provided that the working oil chamber is arranged below the volume compensation chamber and the expansion chamber is arranged above the volume compensation chamber. Alternatively, it can also be provided that the volume compensation chamber is arranged below the working oil chamber and the expansion chamber is arranged above the working oil chamber, the connection from the volume compensation chamber to the expansion chamber being a pipe connection bypassing the working oil chamber.
  • a device for catching a leakage of the heavy oil into the light oil and for returning it to the heavy oil in the volume compensation chamber is arranged on a mechanical seal between the volume compensation chamber and the working oil chamber.
  • a specific implementation for the collection and return of the heavy oil provides that a heavy oil collection tank with a heavy oil sump and a pump is arranged below the mechanical seal for catching a leakage of the heavy oil, which pumps the collected heavy oil back to the volume compensation chamber via a return line.
  • a further advantageous development provides that a heat exchanger is arranged which extracts heat from the light oil and transfers it to the borehole fluid.
  • a pump can be provided which supplies the light oil to be cooled to the heat exchanger by means of an oil circuit.
  • Fig. 1 shows a first embodiment of the invention with a multi-chamber system.
  • the encapsulated volume compensation device 1 is inserted into a borehole 2 in the ground 31, which is usually rock at this depth. This is described in more detail in Fig. 4 presented and described.
  • the encapsulated volume compensation device 1 is used to compensate for the volume of a light oil 4 or light oil-like fluid used for lubrication in a working oil chamber 5 when it expands when heated or contracts again when cooled.
  • the volume changes can be attributed to three causes: Firstly, the temperature difference between the temperature when the light oil 4 is filled in and the temperature when the device 1 is introduced into the hot well water 6 in the borehole 2. This temperature difference is approximately 80 to 150°C.
  • the electric motor 21 then generates heat, resulting in a temperature difference of approximately 50°C.
  • the axial bearing 19 then contributes a further temperature difference of approximately 30°C, but can lead to the highest temperature in its area. All of this also takes place in an environment that is already hot, since geothermal energy is particularly effective when the hottest possible well water can be pumped out.
  • a volume compensation chamber 10 In order to provide volume compensation for the light oil 4 in the working oil chamber 5, in which the axial bearing 19 is also located, this is connected via a connection 16 to a volume compensation chamber 10, namely to its light oil area 10'. Below this in this chamber is a heavy oil area 10", whereby the light oil 4 and the heavy oil 7 form a stable boundary 11 due to their different specific weight.
  • the heavy oil area 10" is connected via a connection 17 to an expansion chamber 12.
  • This expansion chamber 12 has a further heavy oil area 13 in its lower area and a borehole fluid area 14 in its upper area.
  • the borehole fluid 6 flows from a compensation opening 15 into the intermediate area of a tube which lines the borehole 2 as a well wall 38 and contains the various functional elements of the conveying device (see Fig. 4 ).
  • the double arrow 15' shows this entry and exit of the borehole fluid 6 from or into the expansion chamber 13.
  • the pump shaft 20 extends through the volume compensation device 1, with the pump 29 with intake port 34 located above and the electric motor 21 below, which is usually also located in an area of the working oil chamber 5 with light oil 4, which must be imagined as being extended downwards in the illustration.
  • a leakage 23 of the heavy oil 7 can be collected at a mechanical seal 22 when it passes from the volume compensation chamber 10 into the working oil chamber 5.
  • a heavy oil collecting basin 24 is mounted below the mechanical seal 22, preferably a mechanical seal, which collects the leakage 23 and feeds it to a heavy oil sump 25.
  • a pump 26 then ensures that the heavy oil 7 is returned to the light oil area 10 ⁇ of the volume compensation chamber 10 via a return line 27, whereby the latter then sinks to the heavy oil area 10". In this way, it can be avoided that such a leakage 23 causes heavy oil 7 to pass from the volume compensation chamber 10 into the light oil 4 of the working oil chamber 5 and thus be lost for the function described.
  • a heat exchanger 28 is also provided, the function of which is to cool the light oil 4.
  • the heat exchanger 28 is arranged between the working oil chamber 5 and the borehole fluid 6 within the well wall 38.
  • a pump 29 is arranged, for example on the pump shaft 20. It drives an oil circuit 30 (small arrows), which supplies the oil to the heat exchanger 28. In this way, the strong heat development of the axial bearing 19 is dissipated in particular and This prevents the light oil 4 from heating up too much and losing some of its lubricating properties.
  • Fig. 2 shows a single-chamber system not according to the invention, which implements the basic idea of the invention in a simple manner.
  • the axial bearing 19 and the (not shown) electric motor 21 are located in the single chamber, which are located in the light oil 4, which heats up.
  • a piston 9 mounted in a cylinder 8 moves, as shown by the double arrow 9'. Due to this displacement - upwards when heated, downwards when cooled - the heavy oil 7 resting on the piston 9 also moves. Above the heavy oil 7 is the borehole fluid 6, which can enter and exit through the compensation opening 15 according to the arrows 15'.
  • the same reference symbols in the figures show functionally identical features.
  • the boundary 11 between light oil 4 and heavy oil 7 is formed by the piston 9, and the displacement takes place according to the double arrow 9'.
  • the problem with this arrangement is the seal between the movable piston and the cylinder wall.
  • Fig. 3 shows a multi-chamber system not according to the invention, in which the chambers are arranged differently.
  • the working oil chamber 5 is located between the volume compensation chamber 10 and the expansion chamber 12.
  • the axial bearing 19 and the electric motor 21 are arranged in the working oil chamber 5. If the light oil 4 expands in the working oil chamber 5, it is pressed downwards through the connection 16 into the volume compensation chamber 10, in which the light oil area 10' and the heavy oil area 10" are located.
  • a piston 9 is arranged between the heavy oil 7 and the light oil 4, which moves up and down in a cylinder 8 in accordance with the change in volume of the light oil 4.
  • the piston 9 can also be supported by a spring.
  • Fig. 4 shows the use of the invention in a conveying device 39 in a borehole 2.
  • the borehole 2 is separated from the soil 31, i.e. mostly the rock, by a well wall 38.
  • the entire conveying device 39 for the well water 6 is located within this well wall 38.
  • This consists of a deep well pump 3, which is driven by an electric motor 21.
  • the conveying pipe 33 is used for conveying.
  • the electric motor 21 is supplied with power via a cable 32.
  • the encapsulated volume compensation device 1 according to the invention with the axial bearing 19 is arranged between the deep well pump 3 with the intake nozzle 34 and the electric motor 21.
  • a sensor 35 At the lower end of the conveying device 39 there is a sensor 35 and a centering device 36. Above the ground there is an above-ground fitting and pipe 37 for the extracted well water 6 in order to use the geothermal heat.
  • Fig. 2 and Fig. 3 be provided with a device for collecting a leak or have a cooling device.
  • a device for catching a leak could also be arranged between the expansion chamber 12 and the working oil chamber 5.
  • Other variations, such as a system with two chambers, are also possible by transferring features from one example to the other.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
  • Compressor (AREA)

Claims (9)

  1. Système destiné à être introduit dans un trou de forage (2) pour des pompes de puits profond (3) en géothermie, comprenant une chambre (5) à huile de travail remplie d'huile légère (4) ou d'un fluide analogue à de l'huile légère et un dispositif (1) de compensation de volume,
    caractérisé
    en ce qu'une couche de séparation en huile lourde (7) ou en fluide analogue à de l'huile lourde, déplaçable en fonction de la variation de volume de l'huile légère (4) ou du fluide analogue à de l'huile légère, est agencée en tant que dispositif (1) de compensation de volume entre l'huile légère (4) ou le fluide analogue à de l'huile légère de la chambre (5) à huile de travail et le fluide de forage (6) entourant celle-ci.
  2. Système selon la revendication 1,
    caractérisé
    en ce que le dispositif (1) de compensation de volume présente une chambre (10) de compensation de volume reliée à la chambre (5) à huile de travail, qui présente une zone d'huile légère (10') pour la compensation de volume de l'huile légère (4) et une zone d'huile lourde (10") avec une huile lourde (7) ou un fluide analogue à de l'huile lourde,
    en ce que la limite (11) entre la zone d'huile légère (10') et la zone d'huile lourde (10") est apte à être déplacée, et l'huile lourde (7) est apte à s'écouler dans une chambre d'expansion (12) qui présente une autre zone d'huile lourde (13) qui est adjacente à une zone de fluide de forage (14), le fluide de forage (6) étant apte à entrer et sortir de la chambre d'expansion (12) par une ouverture de compensation (15).
  3. Système selon la revendication 2,
    caractérisé
    en ce que la chambre (10) de compensation de volume présente, à partir de sa zone d'huile légère (10'), une connexion (16) à la chambre (5) à huile de travail et, à partir de sa zone d'huile lourde (10''), une connexion (17) à une autre zone d'huile lourde (13) de la chambre d'expansion (12).
  4. Système selon l'une des revendications 2 à 3, caractérisé
    en ce que la chambre (5) à huile de travail est agencée en dessous de la chambre (10) de compensation de volume et que la chambre d'expansion (12) est agencée au-dessus de la chambre (10) de compensation de volume.
  5. Système selon l'une des revendications 2 et 3, caractérisé
    en ce que la chambre (10) de compensation de volume est agencée en dessous de la chambre (5) à huile de travail et la chambre d'expansion (12) est agencée au-dessus de la chambre (5) à huile de travail, la connexion (17) entre la chambre (10) de compensation de volume et la chambre d'expansion (12) étant une connexion tubulaire (18) contournant la chambre (5) à huile de travail.
  6. Système selon l'une des revendications 3 et 4, caractérisé
    en ce qu'un dispositif (23) de collecte d'une fuite de l'huile lourde (7) dans l'huile légère (4) et de renvoi dans l'huile lourde (7) de la chambre de compensation de volume (10) est agencé sur un joint mécanique (22), de préférence une garniture mécanique, entre la chambre de compensation de volume (10) et la chambre (5) à huile de travail.
  7. Système selon la revendication 6,
    caractérisé
    en ce qu'en dessous du joint mécanique (22), pour recueillir une fuite (23) de l'huile lourde (7), est agencé un bassin (24) de collecte d'huile lourde, avec un carter d'huile lourde (25) et une pompe (26), qui renvoie l'huile lourde (7) recueillie dans la chambre de compensation de volume (10) par une conduite de retour (27) .
  8. Système selon les revendications 1 à 7, caractérisé
    en ce qu'un échangeur de chaleur (28) est agencé, lequel extrait de la chaleur (29) de l'huile légère (4) et la transmet au fluide de forage (6).
  9. Système selon la revendication 8,
    caractérisé
    en ce qu'une pompe (29) alimente l'échangeur de chaleur (28) en huile légère (4) à refroidir au moyen d'un circuit d'huile (30).
EP22185953.1A 2021-07-30 2022-07-20 Dispositif de compensation de volume Active EP4134512B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102021119889.5A DE102021119889A1 (de) 2021-07-30 2021-07-30 Volumenausgleichsvorrichtung

Publications (3)

Publication Number Publication Date
EP4134512A1 EP4134512A1 (fr) 2023-02-15
EP4134512C0 EP4134512C0 (fr) 2024-12-11
EP4134512B1 true EP4134512B1 (fr) 2024-12-11

Family

ID=82656264

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22185953.1A Active EP4134512B1 (fr) 2021-07-30 2022-07-20 Dispositif de compensation de volume

Country Status (2)

Country Link
EP (1) EP4134512B1 (fr)
DE (1) DE102021119889A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3182214A (en) * 1962-12-26 1965-05-04 Borg Warner Submersible motor seal section
US3502919A (en) * 1969-01-02 1970-03-24 Borg Warner Submersible motor seal section
US3854064A (en) * 1973-05-10 1974-12-10 Trw Inc Mechanical seal isolator
US4462765A (en) * 1981-12-04 1984-07-31 Rodkin Valentin V Liquid-proofing system for an electric motor of a deep-well pumping unit

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1970484A (en) * 1933-03-30 1934-08-14 Reda Pump Company Oil filled submergible electric motor
DE1186141B (de) 1963-02-21 1965-01-28 Klein Schanzlin & Becker Ag Einrichtung zum Druckausgleich fuer fluessigkeitsgefuellte elektrische Unterwassermotoren
DE3120232C2 (de) 1981-05-21 1985-03-21 Klein, Schanzlin & Becker Ag, 6710 Frankenthal Druckausgleichseinrichtung für den Elektromotor eines gekapselten Kreiselpumpen-Motor-Aggregates
US9763037B2 (en) 2011-05-18 2017-09-12 Medappit Llc Network architecture for synchronized display
CA2959496C (fr) 2014-08-29 2021-03-09 Ge Oil & Gas Esp, Inc. Chambre de detente de fluide a soufflet protege
US20170159414A1 (en) 2015-12-04 2017-06-08 General Electric Company Seal assembly for a submersible pumping system and an associated method thereof
EP3555482B1 (fr) 2016-12-16 2025-11-12 Baker Hughes Holdings LLC Compensateur de pression de lubrifiant de moteur électrique destiné à un moteur de pompe submersible
US11268518B2 (en) * 2018-09-20 2022-03-08 Baker Hughes Oilfield Operations Llc Isolated chamber for mechanical face seal leakage in submersible well pump assembly

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3182214A (en) * 1962-12-26 1965-05-04 Borg Warner Submersible motor seal section
US3502919A (en) * 1969-01-02 1970-03-24 Borg Warner Submersible motor seal section
US3854064A (en) * 1973-05-10 1974-12-10 Trw Inc Mechanical seal isolator
US4462765A (en) * 1981-12-04 1984-07-31 Rodkin Valentin V Liquid-proofing system for an electric motor of a deep-well pumping unit

Also Published As

Publication number Publication date
EP4134512A1 (fr) 2023-02-15
DE102021119889A1 (de) 2023-02-02
EP4134512C0 (fr) 2024-12-11

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