WO2003035225A1 - Method for operating a submarine, rotating device and an apparatus for said device - Google Patents

Method for operating a submarine, rotating device and an apparatus for said device Download PDF

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Publication number
WO2003035225A1
WO2003035225A1 PCT/NO2002/000384 NO0200384W WO03035225A1 WO 2003035225 A1 WO2003035225 A1 WO 2003035225A1 NO 0200384 W NO0200384 W NO 0200384W WO 03035225 A1 WO03035225 A1 WO 03035225A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas
cooled
separated
outlet
scrubber
Prior art date
Application number
PCT/NO2002/000384
Other languages
French (fr)
Inventor
Kjell O. Stinessen
Original Assignee
Kvaerner Eureka As
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 Kvaerner Eureka As filed Critical Kvaerner Eureka As
Publication of WO2003035225A1 publication Critical patent/WO2003035225A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
    • F04D13/083—Units comprising pumps and their driving means the pump being electrically driven for submerged use and protected by a gas-bell
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D25/0686—Units comprising pumps and their driving means the pump being electrically driven specially adapted for submerged use
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
    • F04D29/5866—Cooling at last part of the working fluid in a heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/02—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point using Joule-Thompson effect; using vortex effect

Definitions

  • the invention relates to a method as disclosed in the preamble of the independent method claim.
  • the invention also relates to an arrangement as disclosed in the preamble of the independent apparatus claim.
  • the gas-filled electric motor must be kept as dry as possible to avoid corrosion as a result of the reaction between water and hydrogen sulphide and dilution of the lubricant with hydrocarbon condensate.
  • the object of the present invention is to improve the last-mentioned, known method outlined above by ensuring that a cooled gas is provided which will remain dry during the subsequent heating in the device or motor, under all conditions and especially also during shutdowns and long-term stoppages (dew point control).
  • the gas in the motor may be cooled to the seawater temperature, which typically can be in the range of +10° to -2°C.
  • the known cooling during heat exchange with the surrounding seawater is, according to the invention, followed by a further cooling using the known Joule-Thomson effect.
  • the branched-off gas is cooled to about 30°C, above the hydrate temperature, and during the subsequent throttling utilising the Joule-Thomson effect the gas temperature is brought down to zero and lower, for example minus 5°C.
  • a cold gas of this kind will behave like a dry gas under all the conditions that will be encountered in the subsea station.
  • the drawing shows a subsea station having a rotating device 1, for example, a compressor or a wet gas compressor, arranged in a common pressure shell 2 with an electromotor 3.
  • a rotating device for example, a compressor or a wet gas compressor
  • the pressure shell 2 is supplied with dry gas from a circuit 4 comprising a line 5 which branches off from the outlet 11 of the device 1.
  • the line 5 runs to a heat exchanger 6, where the gas branched off through the line 5 is cooled in heat exchange with the surrounding seawater.
  • a throttle 7 where the already cooled gas is cooled further utilising the known Joule-Thomson effect.
  • a scrubber 8 i.e., a cyclone, a filter, a precipitation chamber or the like, where as much liquid as possible is separated and removed from the cooled gas. From the scrubber 8 there runs a line 9 to the pressure shell 2.
  • the hydrocarbon stream may, for example, have a pressure of 50 bar at the inlet 10 and a pressure of 100 bar at the outlet 11.
  • the pressure is reduced to 60 bar in the throttle 7.
  • the gas temperature is reduced to about 30°C, i.e., above hydration temperature, and after the throttle the gas has a temperature close to minus 5°C.
  • An optional injection 12 of a hydrate inhibitor is indicated upstream of the scrubber 8.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

Gas separated from the outlet (11) from a subsea compressor (1) is cooled utilising the Joule-Thomson effect before it is passed to the gas-filled electric drive motor (2) of the compressor (1). This ensures that there is dry gas in the motor (2) under all the conditions that will be encountered in the subsea station.

Description

Method for operating a submarine, rotating device and an apparatus for said device
The invention relates to a method as disclosed in the preamble of the independent method claim. The invention also relates to an arrangement as disclosed in the preamble of the independent apparatus claim.
The gas-filled electric motor must be kept as dry as possible to avoid corrosion as a result of the reaction between water and hydrogen sulphide and dilution of the lubricant with hydrocarbon condensate. These problems have been discussed in other documents including NO 172075 and NO 173197, which describe respectively the use of a suitable dry foreign gas that is fed to the common pressure shell of a compressor and an electromotor, and the use of a part of the gas pressurised in a compressor as seal gas passed to the seals of the compressor and the gas atmosphere of the electromotor, with cooling of this branched-off gas en route to the device consisting of a compressor and its electromotor.
The object of the present invention is to improve the last-mentioned, known method outlined above by ensuring that a cooled gas is provided which will remain dry during the subsequent heating in the device or motor, under all conditions and especially also during shutdowns and long-term stoppages (dew point control). During such stoppages the gas in the motor may be cooled to the seawater temperature, which typically can be in the range of +10° to -2°C.
The known cooling during heat exchange with the surrounding seawater is, according to the invention, followed by a further cooling using the known Joule-Thomson effect. During the heat exchange with the seawater, the branched-off gas is cooled to about 30°C, above the hydrate temperature, and during the subsequent throttling utilising the Joule-Thomson effect the gas temperature is brought down to zero and lower, for example minus 5°C. A cold gas of this kind will behave like a dry gas under all the conditions that will be encountered in the subsea station.
According to the invention there is therefore proposed a method and an arrangement as defined in the independent claims.
The invention will be described in more detail with reference to the schematic drawing, which shows arrangement according to the invention. The drawing shows a subsea station having a rotating device 1, for example, a compressor or a wet gas compressor, arranged in a common pressure shell 2 with an electromotor 3. For more details, reference is made to the aforementioned NO patents, although the invention is of course not limited specifically to such embodiments. The pressure shell 2 is supplied with dry gas from a circuit 4 comprising a line 5 which branches off from the outlet 11 of the device 1. The line 5 runs to a heat exchanger 6, where the gas branched off through the line 5 is cooled in heat exchange with the surrounding seawater. After the cooler 6 there follows a throttle 7, where the already cooled gas is cooled further utilising the known Joule-Thomson effect. After the throttle 7 there follows a scrubber 8, i.e., a cyclone, a filter, a precipitation chamber or the like, where as much liquid as possible is separated and removed from the cooled gas. From the scrubber 8 there runs a line 9 to the pressure shell 2.
The hydrocarbon stream may, for example, have a pressure of 50 bar at the inlet 10 and a pressure of 100 bar at the outlet 11. The pressure is reduced to 60 bar in the throttle 7. In the cooler 6 the gas temperature is reduced to about 30°C, i.e., above hydration temperature, and after the throttle the gas has a temperature close to minus 5°C. After the scrubbing in the scrubber 8, there will be a dry gas which will remain dry under all conditions, even during shutdowns and stoppages, provided that the scrubber is of some known type that removes water and hydrocarbon liquid in an effective manner. An optional injection 12 of a hydrate inhibitor is indicated upstream of the scrubber 8.

Claims

P a t e n t c l a i m s
1.
A method for the operation of a subsea, rotating device for applying energy to a hydrocarbon stream, which device has an inlet and an outlet and is driven by a gas-filled electric motor whose gas atmosphere is supplied with gas that is separated from said outlet, cooled in heat exchange with surrounding seawater and scrubbed, characterised in that the separated and cooled gas prior to the scrubbing is throttled utilising the Joule- Thomson effect.
2.
A method according to claim 1, characterised in that a hydrate inhibitor agent is added upstream of the scrubbing.
3.
An arrangement for a subsea, rotating device (1) for applying energy to a hydrocarbon stream, which device (1) has an inlet (10) and an outlet (11) for the hydrocarbon gas stream and is driven by a gas-filled electric motor (3), the gas atmosphere of the motor (3) being supplied with gas that is separated from said outlet (11), cooled in a heat exchanger (6) against the surrounding seawater and scrubbed in a scrubber (8), characterised in that between the heat exchanger (6) and the scrubber (8) there is provided a throttle (7) for the separated and, in the heat exchanger (6), cooled gas, which throttle (7) utilises the Joule-Thomson effect.
4.
An arrangement according to claim 3, characterised in that upstream of the scrubber (8) there is provided an injection device (12) for injecting a hydrate inhibitor into the separated gas.
PCT/NO2002/000384 2001-10-24 2002-10-23 Method for operating a submarine, rotating device and an apparatus for said device WO2003035225A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20015199A NO20015199L (en) 2001-10-24 2001-10-24 A method of operating an underwater rotating device and a device in such a device
NO20015199 2001-10-24

Publications (1)

Publication Number Publication Date
WO2003035225A1 true WO2003035225A1 (en) 2003-05-01

Family

ID=19912952

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2002/000384 WO2003035225A1 (en) 2001-10-24 2002-10-23 Method for operating a submarine, rotating device and an apparatus for said device

Country Status (2)

Country Link
NO (1) NO20015199L (en)
WO (1) WO2003035225A1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005003512A1 (en) * 2003-07-02 2005-01-13 Kvaerner Oilfield Products As Subsea compressor module and a method for controlling the pressure in such a subsea compressor module
WO2007055589A1 (en) * 2005-11-11 2007-05-18 Norsk Hydro Produksjon A.S Pressure and leakage control in rotating equipment for subsea compression
WO2007067060A1 (en) * 2005-12-05 2007-06-14 Norsk Hydro Produksjon A.S. Cooling system for an electric motor, and a drive system for driving an impeller
WO2007073195A1 (en) * 2005-12-22 2007-06-28 Norsk Hydro Produksjon A.S. Pump unit and method for pumping a well fluid
GB2453093B (en) * 2006-06-30 2011-04-06 Aker Kvaerner Subsea As Method and apparatus for protection of compressor modules against influx of contaminated gas
US9032987B2 (en) 2008-04-21 2015-05-19 Statoil Petroleum As Gas compression system
EP2633198A4 (en) * 2010-10-27 2017-01-11 Dresser-Rand Company System and method for rapid pressurization of a motor/bearing cooling loop for a hermetically sealed motor/compressor system
CN106837258A (en) * 2017-03-28 2017-06-13 中国石油大学(华东) A kind of gas hydrate exploitation device and method

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3495380A (en) * 1967-02-24 1970-02-17 Shell Oil Co Prevention of gas hydrate formation in gas transport pipelines
US4419867A (en) * 1981-07-07 1983-12-13 Societe Anonyme De Telecommunications Device for regulating a Joule-Thomson effect refrigerator
US4468935A (en) * 1982-01-19 1984-09-04 Societe Anonyme De Telecommunications Device for regulating a Joule-Thomson effect refrigerator
EP0239375A2 (en) * 1986-03-24 1987-09-30 British Aerospace Public Limited Company De-contaminated fluid supply apparatus and cryogenic cooling systems using such apparatus
US5154741A (en) * 1990-07-13 1992-10-13 Petroleo Brasileiro S.A. - Petrobras Deep-water oil and gas production and transportation system
US5382141A (en) * 1991-02-08 1995-01-17 Kvaener Rosenberg A.S. Kvaerner Subsea Contracting Compressor system and method of operation
WO2001074473A1 (en) * 2000-04-05 2001-10-11 Ingen Process Limited Method and apparatus for processing fluids produced from an offshore wellbore

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3495380A (en) * 1967-02-24 1970-02-17 Shell Oil Co Prevention of gas hydrate formation in gas transport pipelines
US4419867A (en) * 1981-07-07 1983-12-13 Societe Anonyme De Telecommunications Device for regulating a Joule-Thomson effect refrigerator
US4468935A (en) * 1982-01-19 1984-09-04 Societe Anonyme De Telecommunications Device for regulating a Joule-Thomson effect refrigerator
EP0239375A2 (en) * 1986-03-24 1987-09-30 British Aerospace Public Limited Company De-contaminated fluid supply apparatus and cryogenic cooling systems using such apparatus
US5154741A (en) * 1990-07-13 1992-10-13 Petroleo Brasileiro S.A. - Petrobras Deep-water oil and gas production and transportation system
US5382141A (en) * 1991-02-08 1995-01-17 Kvaener Rosenberg A.S. Kvaerner Subsea Contracting Compressor system and method of operation
WO2001074473A1 (en) * 2000-04-05 2001-10-11 Ingen Process Limited Method and apparatus for processing fluids produced from an offshore wellbore

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005003512A1 (en) * 2003-07-02 2005-01-13 Kvaerner Oilfield Products As Subsea compressor module and a method for controlling the pressure in such a subsea compressor module
GB2419384A (en) * 2003-07-02 2006-04-26 Kvaerner Oilfield Prod As Subsea compressor module and a method for controlling the pressure in such a subsea compressor module
GB2419384B (en) * 2003-07-02 2007-11-14 Kvaerner Oilfield Prod As Subsea compressor module and a method for controlling the pressure in such a subsea compressor module
AU2004254526B2 (en) * 2003-07-02 2009-06-11 Aker Solutions As Subsea compressor module and a method for controlling the pressure in such a subsea compressor module
US7654328B2 (en) 2003-07-02 2010-02-02 Aker Subsea As Subsea compressor module and a method for controlling the pressure in such a subsea compressor module
WO2007055589A1 (en) * 2005-11-11 2007-05-18 Norsk Hydro Produksjon A.S Pressure and leakage control in rotating equipment for subsea compression
WO2007067060A1 (en) * 2005-12-05 2007-06-14 Norsk Hydro Produksjon A.S. Cooling system for an electric motor, and a drive system for driving an impeller
WO2007073195A1 (en) * 2005-12-22 2007-06-28 Norsk Hydro Produksjon A.S. Pump unit and method for pumping a well fluid
GB2453093B (en) * 2006-06-30 2011-04-06 Aker Kvaerner Subsea As Method and apparatus for protection of compressor modules against influx of contaminated gas
AU2007265793B2 (en) * 2006-06-30 2012-02-23 Aker Solutions As Method and apparatus for protection of compressor modules against influx of contaminated gas
US9032987B2 (en) 2008-04-21 2015-05-19 Statoil Petroleum As Gas compression system
US9784076B2 (en) 2008-04-21 2017-10-10 Statoil Petroleum As Gas compression system
US9784075B2 (en) 2008-04-21 2017-10-10 Statoil Petroleum As Gas compression system
EP2633198A4 (en) * 2010-10-27 2017-01-11 Dresser-Rand Company System and method for rapid pressurization of a motor/bearing cooling loop for a hermetically sealed motor/compressor system
US9726196B2 (en) 2010-10-27 2017-08-08 Dresser-Rand Company System and cooling for rapid pressurization of a motor-bearing cooling loop for a hermetically sealed motor/compressor system
CN106837258A (en) * 2017-03-28 2017-06-13 中国石油大学(华东) A kind of gas hydrate exploitation device and method

Also Published As

Publication number Publication date
NO20015199L (en) 2003-04-25
NO20015199D0 (en) 2001-10-24

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