GB2480652A - Underwater power distribution through a damaged umbilical - Google Patents
Underwater power distribution through a damaged umbilical Download PDFInfo
- Publication number
- GB2480652A GB2480652A GB1008816A GB201008816A GB2480652A GB 2480652 A GB2480652 A GB 2480652A GB 1008816 A GB1008816 A GB 1008816A GB 201008816 A GB201008816 A GB 201008816A GB 2480652 A GB2480652 A GB 2480652A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electrical power
- frequency
- underwater
- umbilical
- location
- 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.)
- Granted
Links
- 239000004020 conductor Substances 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000001010 compromised effect Effects 0.000 claims abstract description 9
- 238000000605 extraction Methods 0.000 claims abstract description 6
- 239000012530 fluid Substances 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000012544 monitoring process Methods 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 claims description 2
- 239000013535 sea water Substances 0.000 description 3
- 238000009413 insulation Methods 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
- H02J3/0012—Contingency detection
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/003—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings with electrically conducting or insulating means
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/01—Risers
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/035—Well heads; Setting-up thereof specially adapted for underwater installations
- E21B33/0355—Control systems, e.g. hydraulic, pneumatic, electric, acoustic, for submerged well heads
-
- 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
- E21B47/00—Survey of boreholes or wells
- E21B47/10—Locating fluid leaks, intrusions or movements
- E21B47/113—Locating fluid leaks, intrusions or movements using electrical indications; using light radiations
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/66—Structural association with built-in electrical component
- H01R13/70—Structural association with built-in electrical component with built-in switch
- H01R13/707—Structural association with built-in electrical component with built-in switch interlocked with contact members or counterpart
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mechanical Engineering (AREA)
- Geophysics (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Prevention Of Electric Corrosion (AREA)
- Electric Cable Installation (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
- Testing Relating To Insulation (AREA)
Abstract
There is disclosed a method of using an umbilical 3 between a surface location 1 and an underwater location of an underwater fluid extraction well system, the umbilical 3 carrying an electrical power conductor and having been compromised by the leakage of current from the conductor to surrounding water. Electrical power from a source 2 at the surface location at a first frequency is converted to electrical power at a second frequency, lower than the first frequency, or to DC electrical power; said electrical power at the second frequency or said DC electrical power is transmitted to the underwater location via the umbilical 3. At the underwater location, said electrical power at the second frequency or said DC electrical power is converted to electrical power at a frequency used by underwater equipment of the well system.
Description
EXTENDING THE LIFE OF A COMPROMISED UMBILICAL
Field of the Invention
The present invention relates to extending the life of a compromised umbilical.
Backcround of the Invention One of the most common problems with a subsea umbilical between a fluid extraction well surface platform and a well complex is degradation of the insulation impedance between internal conductors of the umbilical and earth, i.e. the surrounding sea water. In practice, the umbilical is compromised by the in ingress of sea water, causing the capacitance between the conductors and earth to increase substantially, with resultant increase of leakage currents and less power available for the well complex. This invention enables a solution to this problem by saving the need to replace the umbilical.
Various systems for providing electrical power to an underwater location are described in: GB-A-2 332 220; GB-A-2 382 600; WO01/84689; W002/37640; US-A-5 444 184; US-A-4 646,083; US-A-4 636 934; WO01/71158; US-A-4 080 025; and US-A-6 045 333.
Summary of the Invention
According to the present invention from one aspect, there is provided a method of using an umbilical between a surface location and an underwater location of an underwater fluid extraction well system, the umbilical carrying an electrical power conductor and having been compromised by the leakage of current from the conductor to surrounding water, the method comprising: converting electrical power from a source at the surface location at a first frequency to electrical power at a second frequency, lower than the first frequency, or to DC electrical power; transmitting said electrical power at the second frequency or said DC electrical power to the underwater location via the conductor; and at the underwater location, converting said electrical power at the second frequency or said DC electrical power to electrical power at a frequency used by underwater equipment of the well system.
Typically, the frequency of electrical power used by underwater equipment of the well system is the same as the first frequency.
The umbilical could, for example, be connected to a distribution unit at the underwater location or to a module at the underwater location before a distribution unit of the well system.
Typically, the underwater location is on the bed of a body of water surrounding the umbilical.
Typically, the method included the steps of, at the underwater location, monitoring electrical power from the umbilical and, if the voltage of the electrical power is less than a threshold, the steps of: providing at the surface location means for converting said electrical power from the source at the first frequency to said electrical power at the second frequency or to said DC electrical power; and providing at the underwater location means for converting the electrical power at the second frequency or said DC electrical power to electrical power at said frequency used by underwater equipment of the well system.
Alternatively, the method could have included the steps of, at the underwater location, monitoring electrical power from the umbilical and, if the voltage of the electrical power is less than a threshold, the steps of: causing first converting means, at the surface location, to convert said electrical power from the source at the first frequency to said electrical power at the second frequency or to said DC electrical power; and causing second converting means, at the underwater location, to convert the electrical power at the second frequency or said DC electrical power to electrical power at said frequency used by underwater equipment of the well system.
According to the present invention from another aspect, there is provided an underwater fluid extraction well system, comprising: a source of electrical power at a first frequency at a surface location; an umbilical for transmitting electrical power from the source via an electrical conductor of the umbilical to an underwater location for use by underwater equipment of the well system; and means at the underwater location for monitoring electrical power from the conductor, wherein the system further comprises: first converting means for use at the surface location, for converting electrical power from the source to electrical power at a second frequency, lower than the first frequency, or to DC electrical power; and second converting means, for use at the underwater location, for converting such electrical power at the second frequency or said DC electrical power to electrical power at a frequency used by said underwater equipment of the well system, so that, if said monitoring means indicates that the voltage of electrical power from the conductor is less than a threshold, said first converting means can be used to convert electrical power from the source to said lower frequency or to DC, for transmission via said conductor to the underwater location, and said second converting means can be used to convert the electrical power at the second frequency on the DC electrical power to electrical power at the frequency used by said underwater equipment of the system.
Brief Descrirtion of the DrawinQs Fig. la shows schematically a typical existing arrangement using an umbilical; and Fig. lb shows schematically an arrangement using an embodiment of the invention.
Descrirtion of an Embodiment of the Invention Referring first to Fig. la, this shows schematically a typical existing arrangement of a surface platform 1 with an AC electrical power source 2 (typically operating at 50 or Hz) connecting to the power conductors within an umbilical 3 via an electrical power and control module (EPCM) 4. The seabed end of the umbilical 3 connects to a distribution assembly 5 on the seabed B, the assembly 5 feeding electrical power to a multiplicity of wells via power connections 6.
Referring to Fig. ib, this shows schematically an arrangement operating according to an embodiment of the invention. In Fig. ib, items which correspond with those in Fig. Ia have the same reference numerals as Fig. la. The umbilical 3 has been compromised by the ingress of sea water, causing the capacitance between its power conductors and earth to increase substantially with resultant increase of leakage currents and less power available to the well complex.
An electronic converter 7 is installed in the EPCM 4 and receives AC electrical power from source 2 (typically at 50 or 60 Hz) and outputs electrical power at a lower frequency. A frequency of 16 2/3 Hz is a favoured choice as communications on power (COP) electrical power control equipment operating at this frequency is readily available as a result of this frequency being a standard for the railway industry. A possible alternative is for the converter 7 to be one which simply rectifies the AC input power to produce DC electrical power and thus feed this DC electrical power down the umbilical 3 instead of AC electrical power. Both lower frequency AC and DC will substantially overcome the initial problem with the increased capacitance of the insulation of the compromised umbilical 3.
At the seabed end of the umbilical 3, a second electronic converter 8 is installed in the distribution assembly 5 or, as a possible alternative, is housed in a module on the seabed B and connected to the end of the umbilical 3 before it reaches the distribution assembly 5. The actual location of the subsea converter 8 will depend on the existing installation configuration. The converter 8 receives electrical power at the lower frequency, or DC, and outputs electrical power at the original power supply frequency for use by underwater equipment of the well complex via power connections 6.
The steps by which it had been determined that the umbilical 3 had become compromised were as follows. If conventional monitoring equipment 9 at the underwater location, for example (as shown) at the distribution assembly 5 or a module before it, indicated that the voltage of power from the power conductors in the umbilical 3 had dropped below a threshold, detection of this at the platform 1 is an indication, on the one hand, to install inverter 7 in EPCM 4 and, on the other hand, to install inverter 8 subsea, typically using a remotely operated vehicle (ROy).
Alternatively, the converters 7 and 8 could be pre-installed at the surface location and subsea respectively, and switched into operation in the EPCM 4 and in the distribution assembly 5 or module if the monitoring equipment 9 indicates that the voltage of power from the power conductors in the umbilical 3 drops below a threshold.
Advantages of using the Invention The present invention allows the problems of an umbilical which is failing due to water ingress to be substantially overcome, thus allowing a prolonged life for a well complex without having to replace the expensive umbilical.
Claims (8)
- CLAIMS: 1. A method of using an umbilical between a surface location and an underwater location of an underwater fluid extraction well system, the umbilical carrying an electrical power conductor and having been compromised by the leakage of current from the conductor to surrounding water, the method comprising: converting electrical power from a source at the surface location at a first frequency to electrical power at a second frequency, lower than the first frequency, or to DC electrical power; is transmitting said electrical power at the second frequency or said DC electrical power to the underwater location via the conductor; and at the underwater location, converting said electrical power at the second frequency or said DC electrical power to electrical power at a frequency used by underwater equipment of the well system.
- 2. A method according to claim 1, wherein the frequency of electrical power used by underwater equipment of the well system is the same as the first frequency.
- 3. A method according to claim 1 or 2, wherein the umbilical is connected to a distribution unit at the underwater location.
- 4. A method according to claim 1 or 2, wherein the umbilical is connected to a module at the underwater location before a distribution unit of the well system.
- 5. A method according to any preceding claim, wherein the underwater location is on the bed of a body of water surrounding the umbilical.
- 6. A method according to any preceding claim, which included the steps of, at the underwater location, monitoring electrical power from the umbilical and, if the voltage of the electrical power is less than a threshold, the steps of: providing at the surface location means for converting said electrical power from the source at the first frequency to said electrical power at the second frequency or to said DC electrical power; and providing at the underwater location means for converting the electrical power at the second frequency or said DC electrical power to electrical power at said frequency used by underwater equipment of the well system.
- 7. A method according to any of claims I to 5, which included the steps of, at the underwater location, monitoring electrical power from the umbilical and, if the voltage of the electrical power is less than a threshold, the steps of: causing first converting means, at the surface location, to convert said electrical power from the source at the first frequency to said electrical power at the second frequency or to said DC electrical power; and causing second converting means, at the underwater location, to convert the electrical power at the second frequency or said DC electrical power to electrical power at said frequency used by underwater equipment of the well system.
- 8. An underwater fluid extraction well system, comprising: a source of electrical power at a first frequency at a surface location; an umbilical for transmitting electrical power from the source via an electrical conductor of the umbilical to an underwater location for use by underwater equipment of the well system; and means at the underwater location for monitoring electrical power from the conductor, wherein the system further comprises: first converting means, for use at the surface location, for converting electrical power from the source to electrical power at a second frequency, lower than the first frequency, or to DC electrical power; and second converting means, for use at the underwater location, for converting such electrical power at the second frequency or said DC electrical power to electrical power at a frequency used by said underwater equipment of the well system, so that, if said monitoring means indicates that the voltage of electrical power from the conductor is less than a threshold, said first converting means can be used to convert electrical power from the source to said lower frequency or to DC, for transmission via said conductor to the underwater location, and said second converting means can be used to convert the electrical power at the second frequency or the DC electrical power to electrical power at the frequency used by said underwater equipment of the system.
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1008816.9A GB2480652B (en) | 2010-05-27 | 2010-05-27 | Extending the life of a compromised umbilical |
EP10166268.2A EP2390460B1 (en) | 2010-05-27 | 2010-06-17 | Extending the life of a compromised umbilical |
MYPI2011002262A MY157207A (en) | 2010-05-27 | 2011-05-20 | Extending the life of a compromised umbilical |
SG2011036431A SG176387A1 (en) | 2010-05-27 | 2011-05-20 | Extending the life of a compromised umbilical |
BRPI1102490A BRPI1102490B1 (en) | 2010-05-27 | 2011-05-23 | methods of using an umbilical cable and underwater fluid extraction well system |
AU2011202452A AU2011202452B9 (en) | 2010-05-27 | 2011-05-25 | Extending the life of a compromised umbilical |
US13/116,380 US9650886B2 (en) | 2010-05-27 | 2011-05-26 | Extending the life of a compromised umbilical |
CN201110161357.4A CN102359356B (en) | 2010-05-27 | 2011-05-27 | Extend the life-span of impaired umbilical cables |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1008816.9A GB2480652B (en) | 2010-05-27 | 2010-05-27 | Extending the life of a compromised umbilical |
Publications (3)
Publication Number | Publication Date |
---|---|
GB201008816D0 GB201008816D0 (en) | 2010-07-14 |
GB2480652A true GB2480652A (en) | 2011-11-30 |
GB2480652B GB2480652B (en) | 2015-07-29 |
Family
ID=42371037
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1008816.9A Active GB2480652B (en) | 2010-05-27 | 2010-05-27 | Extending the life of a compromised umbilical |
Country Status (8)
Country | Link |
---|---|
US (1) | US9650886B2 (en) |
EP (1) | EP2390460B1 (en) |
CN (1) | CN102359356B (en) |
AU (1) | AU2011202452B9 (en) |
BR (1) | BRPI1102490B1 (en) |
GB (1) | GB2480652B (en) |
MY (1) | MY157207A (en) |
SG (1) | SG176387A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB0921632D0 (en) * | 2009-12-10 | 2010-01-27 | Viper Subsea Ltd | Line monitoring device |
EP2801695A1 (en) | 2013-05-08 | 2014-11-12 | Siemens Aktiengesellschaft | Subsea electrical unit and system |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007086722A1 (en) * | 2006-01-27 | 2007-08-02 | Alpha Perisai Sdn. Bhd. | Electrical power transmission system |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
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FR2350496A1 (en) | 1976-05-03 | 1977-12-02 | Matra Engins | AUTOMATIC CONNECTOR AND APPLICATION OF THE DIT CONNECTOR TO SUBMARINE CONNECTION MODULES |
US4309734A (en) * | 1979-11-05 | 1982-01-05 | Trw Inc. | Methods and apparatus for limiting electrical current to a subsea petroleum installation |
US4646083A (en) * | 1984-04-26 | 1987-02-24 | Hydril Company | Borehole measurement and telemetry system |
US4636934A (en) | 1984-05-21 | 1987-01-13 | Otis Engineering Corporation | Well valve control system |
NO174488C (en) | 1992-02-12 | 1994-05-11 | Alcatel Stk As | Cable for transmitting power and signals |
US20040043501A1 (en) | 1997-05-02 | 2004-03-04 | Baker Hughes Incorporated | Monitoring of downhole parameters and chemical injection utilizing fiber optics |
US6045333A (en) | 1997-12-01 | 2000-04-04 | Camco International, Inc. | Method and apparatus for controlling a submergible pumping system |
GB2332220B (en) * | 1997-12-10 | 2000-03-15 | Abb Seatec Ltd | An underwater hydrocarbon production system |
GB9913600D0 (en) | 1999-06-12 | 1999-08-11 | Sensor Highway Ltd | Opto-electrical actuation system and method |
NO313767B1 (en) | 2000-03-20 | 2002-11-25 | Kvaerner Oilfield Prod As | Process for obtaining simultaneous supply of propellant fluid to multiple subsea wells and subsea petroleum production arrangement for simultaneous production of hydrocarbons from multi-subsea wells and supply of propellant fluid to the s. |
NO312080B1 (en) * | 2000-04-28 | 2002-03-11 | Aker Eng As | Electric power distribution system |
DE20018560U1 (en) | 2000-10-30 | 2002-03-21 | CAMERON GmbH, 29227 Celle | Control and supply system |
US7615893B2 (en) | 2000-05-11 | 2009-11-10 | Cameron International Corporation | Electric control and supply system |
GB2382600B (en) * | 2001-12-03 | 2005-05-11 | Abb Offshore Systems Ltd | Transmitting power to an underwater hydrocarbon production system |
US7699102B2 (en) | 2004-12-03 | 2010-04-20 | Halliburton Energy Services, Inc. | Rechargeable energy storage device in a downhole operation |
EP1918508A1 (en) | 2006-10-31 | 2008-05-07 | Shell Internationale Researchmaatschappij B.V. | Method and system for providing electrical power to downhole well equipment |
GB2443559B (en) * | 2006-11-06 | 2011-10-05 | Weatherford Lamb | Distributed temperature sensing in a remotely operated vehicle umbilical fiber optic cable |
EP2071694B1 (en) * | 2007-12-11 | 2019-02-20 | General Electric Company | MVDC power transmission system for sub-sea loads |
-
2010
- 2010-05-27 GB GB1008816.9A patent/GB2480652B/en active Active
- 2010-06-17 EP EP10166268.2A patent/EP2390460B1/en active Active
-
2011
- 2011-05-20 MY MYPI2011002262A patent/MY157207A/en unknown
- 2011-05-20 SG SG2011036431A patent/SG176387A1/en unknown
- 2011-05-23 BR BRPI1102490A patent/BRPI1102490B1/en active IP Right Grant
- 2011-05-25 AU AU2011202452A patent/AU2011202452B9/en active Active
- 2011-05-26 US US13/116,380 patent/US9650886B2/en active Active
- 2011-05-27 CN CN201110161357.4A patent/CN102359356B/en not_active Expired - Fee Related
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007086722A1 (en) * | 2006-01-27 | 2007-08-02 | Alpha Perisai Sdn. Bhd. | Electrical power transmission system |
Also Published As
Publication number | Publication date |
---|---|
US9650886B2 (en) | 2017-05-16 |
AU2011202452B8 (en) | 2016-09-22 |
BRPI1102490A2 (en) | 2014-02-11 |
CN102359356B (en) | 2015-12-02 |
SG176387A1 (en) | 2011-12-29 |
AU2011202452B2 (en) | 2016-05-19 |
CN102359356A (en) | 2012-02-22 |
EP2390460A3 (en) | 2015-11-04 |
GB201008816D0 (en) | 2010-07-14 |
US20160069176A1 (en) | 2016-03-10 |
GB2480652B (en) | 2015-07-29 |
BRPI1102490A8 (en) | 2016-04-05 |
AU2011202452B9 (en) | 2016-09-22 |
EP2390460B1 (en) | 2016-12-28 |
AU2011202452A8 (en) | 2016-09-22 |
EP2390460A2 (en) | 2011-11-30 |
AU2011202452A1 (en) | 2011-12-15 |
MY157207A (en) | 2016-05-13 |
BRPI1102490B1 (en) | 2020-01-28 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) |
Free format text: REGISTERED BETWEEN 20150611 AND 20150617 |