WO1999035370A1 - Method of gravitation separation of a hydrocarbon flow and a pressure flush device for flushing a gravitation separator for a hydrocarbon flow - Google Patents

Method of gravitation separation of a hydrocarbon flow and a pressure flush device for flushing a gravitation separator for a hydrocarbon flow Download PDF

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Publication number
WO1999035370A1
WO1999035370A1 PCT/NO1999/000001 NO9900001W WO9935370A1 WO 1999035370 A1 WO1999035370 A1 WO 1999035370A1 NO 9900001 W NO9900001 W NO 9900001W WO 9935370 A1 WO9935370 A1 WO 9935370A1
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WO
WIPO (PCT)
Prior art keywords
gravitation
line
water
flushing
separator
Prior art date
Application number
PCT/NO1999/000001
Other languages
French (fr)
Inventor
Kjell O. Stinessen
Geir Inge Olsen
Original Assignee
Kværner Oilfield Products A.S
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 Kværner Oilfield Products A.S filed Critical Kværner Oilfield Products A.S
Priority to AU17895/99A priority Critical patent/AU1789599A/en
Publication of WO1999035370A1 publication Critical patent/WO1999035370A1/en

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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
    • E21B43/34—Arrangements for separating materials produced by the well
    • E21B43/36—Underwater separating arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/02—Separation of non-miscible liquids
    • B01D17/0208—Separation of non-miscible liquids by sedimentation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/02—Separation of non-miscible liquids
    • B01D17/0208—Separation of non-miscible liquids by sedimentation
    • B01D17/0214—Separation of non-miscible liquids by sedimentation with removal of one of the phases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/12—Auxiliary equipment particularly adapted for use with liquid-separating apparatus, e.g. control circuits
    • 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
    • E21B43/34—Arrangements for separating materials produced by the well
    • E21B43/35—Arrangements for separating materials produced by the well specially adapted for separating solids
    • 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
    • E21B43/34—Arrangements for separating materials produced by the well
    • E21B43/40—Separation associated with re-injection of separated materials

Definitions

  • the invention relates to a method of gravitation separation of a hydrocarbon flow, where water and solids, primarily sand, are separated out in a gravitation vessel, and where a flushing and agitation of the separated solids is carried out at regular or irregular intervals, and these are conducted to the well stream downstream of the gravitation separation, and where the separated water is pressurized by a reinjection pump and reinjected into the ground.
  • the invention also relates to a flush device for flushing a gravitation separator for a hydrocarbon flow which is supplied to the gravitation separator through a well stream flow line, in which gravitation separator there are separated out water and solids, which device comprises a line for separated water from the gravitation separator, a reinjection pump in the line, and a valve-regulated line from the reinjection pump back to a flush device in the gravitation separator.
  • the flow from the well ⁇ the so-called well stream ⁇ is usually conducted from the well up to a platform for further processing.
  • the well stream contains hydrocarbons (oil and gas), produced water and usually also sand.
  • the well stream is separated by means of conventional separation equipment such as, for example, sedimentation tanks, hydrocyclones and the like.
  • a problem with the production platforms of today is that the platform construction imposes severe limitations with respect to the weight of the equipment placed on the platform.
  • the production of hydrocarbons will decline over time. Given the same total volume of flow from the well, this change will be manifested by a substantial increase in the proportion of produced water at the same time as the proportion of hydrocarbons is reduced.
  • This can be compensated for by increasing the volume of flow by, for example, phasing in several wells in order to maintain the highest possible rate of hydrocarbon production.
  • This will mean that the total amount of produced water and potential sand will increase to a very substantial degree, which will place a corresponding demand on the capacity of the transport pipe and the processing equipment.
  • the platform In order to accommodate the increased weight of the process equipment as a result of a greater amount of produced water and sand, the platform will have to be dimensioned for greater loads, which will increase to a considerable degree the cost of the platform.
  • the present invention is based on the need to be able to separate out as much water as possible at an early stage, before the final processing plant, which is situated on a platform or on land, and the need for pure, readily injectable produced water.
  • Norwegian patent application P962920 describes a separation of water from a hydrocarbon flow in a separator located on the sea bed.
  • the produced water is purified of sand prior to its being injected into a well, and the sand that is separated out is introduced into the well stream running from the separator and to the processing plant.
  • the processing plant is equipped to handle impurities such as sand, and the problem relating to the depositing of sand is therefore solved without the need for special measures on the sea bed.
  • One also avoids the pollution of the environment as a result of the release of separated sand into the sea. It is suggested that a portion of the pressurized water after a cyclone separation of sand should be diverted as flush water to be used in the water separation.
  • a method is proposed as mentioned in the introduction, which method is characterized in that sea water is pressurized by the reinjection pump for separated water and is sent into the gravitation vessel for flushing and agitation of the solids.
  • a pressure flush device as mentioned in the introduction, which pressure flush device is characterized in that a valve-regulated sea water line is connected to the line for separated water upstream of the reinjection pump.
  • the pressure flush device can advantageously comprise a valve- regulated branch line from the well stream flow line to the flush device.
  • a hydrocarbon/water separator in the form of a vessel 1 having a separator chamber 2.
  • a hydrocarbon flow passes into flow line 6, which is connected by a branch line 7 to a flow inlet 8 in separator chamber 2.
  • a line 3 for oil and gas runs to flow line 6.
  • From gravitation vessel 1 there also runs a line 4 for separated water.
  • This water line 4 leads to a water injection pump 5.
  • a flush water line 12 leads back to gravitation vessel 1 , or more specifically to a flush device 13 in separator chamber 2.
  • This flush device 13 is also connected to branch line 7 by means of a line 14.
  • a sea water line 15 is connected to water line 4, upstream near the injection pump 5.
  • Valves are provided in the lines. Only those valves that are necessary for the understanding of the invention are shown, and they will be described below in more detail in connection with the discussion of the device's mode of operation.
  • a hydrocarbon flow from a well is supplied to separator chamber 2 through line 7 and inlet 8. This is made possible by the opening of valves 16 and 17.
  • water is separated out and drawn out through line 4, which leads to water injection pump 5.
  • Valve 18 is opened for this purpose.
  • Valve 19 downstream of pump 5 is also open.
  • Oil/gas passes through line 3 (valve 20 is opened) to flow line 6 (valve 21 is also open). Solids, especially sand, may pass out through line 11 when valve 22 is open, and will return to the well stream together with oil/gas in line 6.
  • Valves 23 (in line 14), 24 (in sea water line 15), and 25 (in line 12) are closed.
  • Valve 26 (in flow line 6) is open.
  • Gravitation vessel 1 has a ventilation line 27 provided with a valve 28. Valve 28 is opened when there is a need for ventilation or aeration.
  • the flushing can be done by using sea water. This type of flushing will usually have a duration of the order of 1/2 to 2 minutes, and can be carried out at intervals ranging from a few days to several months, depending on the solids/sand production.
  • the valves 22, 25 and 24 are open. Valves 20 and 19 may be either open or closed, depending on what is most advantageous based on a process evaluation in the individual situation.
  • Flushing may also be carried out by using the well stream (oil, gas and water).
  • valve 17, valve 20 and valve 18 are closed. Pump 5 is stopped, and valves 23 and 22 are opened. The well stream will thereby be conducted to flush device 13, which has nozzles for discharging the flushing medium against the bottom of separator chamber 2.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Chemical & Material Sciences (AREA)
  • Thermal Sciences (AREA)
  • Removal Of Floating Material (AREA)

Abstract

There is described a method and a device for sand flushing a gravitation separator for a hydrocarbon flow from a well. Flushing can be carried out by using sea water or by using the well stream itself. A sea water line (15) is connected to a water line (4) from a gravitation vessel (1) upstream of a reinjection pump (5) for water in the water line (4). On the downstream side of the reinjection pump (5), a line (12) runs back to a flush device (13) in the gravitation vessel (1). The flush device (13), with the aid of a valve-regulated line (14) from the flow line (7) carrying the well stream, is also adapted for using the well stream as a flushing medium.

Description

Method of gravitation separation of a hydrocarbon flow and a pressure flush device for flushing a gravitation separator for a hydrocarbon flow.
The invention relates to a method of gravitation separation of a hydrocarbon flow, where water and solids, primarily sand, are separated out in a gravitation vessel, and where a flushing and agitation of the separated solids is carried out at regular or irregular intervals, and these are conducted to the well stream downstream of the gravitation separation, and where the separated water is pressurized by a reinjection pump and reinjected into the ground.
The invention also relates to a flush device for flushing a gravitation separator for a hydrocarbon flow which is supplied to the gravitation separator through a well stream flow line, in which gravitation separator there are separated out water and solids, which device comprises a line for separated water from the gravitation separator, a reinjection pump in the line, and a valve-regulated line from the reinjection pump back to a flush device in the gravitation separator.
In oil and gas production at sea, the flow from the well ~ the so-called well stream ~ is usually conducted from the well up to a platform for further processing. The well stream contains hydrocarbons (oil and gas), produced water and usually also sand. On the platform the well stream is separated by means of conventional separation equipment such as, for example, sedimentation tanks, hydrocyclones and the like.
A problem with the production platforms of today is that the platform construction imposes severe limitations with respect to the weight of the equipment placed on the platform. During the lifetime of an oil or gas field, the production of hydrocarbons will decline over time. Given the same total volume of flow from the well, this change will be manifested by a substantial increase in the proportion of produced water at the same time as the proportion of hydrocarbons is reduced. This can be compensated for by increasing the volume of flow by, for example, phasing in several wells in order to maintain the highest possible rate of hydrocarbon production. This will mean that the total amount of produced water and potential sand will increase to a very substantial degree, which will place a corresponding demand on the capacity of the transport pipe and the processing equipment. In order to accommodate the increased weight of the process equipment as a result of a greater amount of produced water and sand, the platform will have to be dimensioned for greater loads, which will increase to a considerable degree the cost of the platform.
Therefore, it has been suggested that there be undertaken a separation of the hydrocarbon flow at the sea bed, in the proximity of the well head, or on the sea bed below the platform. It is known technique to reinject the produced water to the hydrocarbon-producing formation in order to enhance the recovery rate. Quite understandably, high standards are set for the purity of this water, it being particularly important that the water should not contain disturbing amounts of sand and other particles, which would result in clogging of the well and the formation.
The present invention is based on the need to be able to separate out as much water as possible at an early stage, before the final processing plant, which is situated on a platform or on land, and the need for pure, readily injectable produced water.
Norwegian patent application P962920 describes a separation of water from a hydrocarbon flow in a separator located on the sea bed. The produced water is purified of sand prior to its being injected into a well, and the sand that is separated out is introduced into the well stream running from the separator and to the processing plant. In case a three-phase separator is used, i.e., when oil and gas are each transported in their respective pipes, the separated sand is incorporated into the oil stream. The processing plant is equipped to handle impurities such as sand, and the problem relating to the depositing of sand is therefore solved without the need for special measures on the sea bed. One also avoids the pollution of the environment as a result of the release of separated sand into the sea. It is suggested that a portion of the pressurized water after a cyclone separation of sand should be diverted as flush water to be used in the water separation.
With this prior art as a background, it is proposed according to the invention that the surrounding sea water should be used as a flushing medium.
Therefore, according to the invention, a method is proposed as mentioned in the introduction, which method is characterized in that sea water is pressurized by the reinjection pump for separated water and is sent into the gravitation vessel for flushing and agitation of the solids. Further, there is proposed according to the invention a pressure flush device as mentioned in the introduction, which pressure flush device is characterized in that a valve-regulated sea water line is connected to the line for separated water upstream of the reinjection pump. The pressure flush device can advantageously comprise a valve- regulated branch line from the well stream flow line to the flush device.
With this invention one achieves the advantage of being able to use an unlimited supply of flushing medium in that, as mentioned above, sea water is drawn in and is pressurized for further use as flushing medium in the gravitation separator.
The invention will now be explained in more detail with reference to the drawing, which shows a gravitation separator system.
On the drawing there is shown a hydrocarbon/water separator in the form of a vessel 1 having a separator chamber 2.
A hydrocarbon flow passes into flow line 6, which is connected by a branch line 7 to a flow inlet 8 in separator chamber 2. A line 3 for oil and gas runs to flow line 6. From gravitation vessel 1 there also runs a line 4 for separated water. This water line 4 leads to a water injection pump 5. From pump 5 there runs a line 9 to a water injection wellhead Christmas tree 10.
From the bottom of gravitation vessel 1, a linel 1 for carrying solids runs to the oil/gas line 3.
From pressurized water line 9, a flush water line 12 leads back to gravitation vessel 1 , or more specifically to a flush device 13 in separator chamber 2. This flush device 13 is also connected to branch line 7 by means of a line 14.
A sea water line 15 is connected to water line 4, upstream near the injection pump 5.
Valves are provided in the lines. Only those valves that are necessary for the understanding of the invention are shown, and they will be described below in more detail in connection with the discussion of the device's mode of operation.
A hydrocarbon flow from a well is supplied to separator chamber 2 through line 7 and inlet 8. This is made possible by the opening of valves 16 and 17. In separator chamber 2, water is separated out and drawn out through line 4, which leads to water injection pump 5. Valve 18 is opened for this purpose. Valve 19 downstream of pump 5 is also open. Oil/gas passes through line 3 (valve 20 is opened) to flow line 6 (valve 21 is also open). Solids, especially sand, may pass out through line 11 when valve 22 is open, and will return to the well stream together with oil/gas in line 6. Valves 23 (in line 14), 24 (in sea water line 15), and 25 (in line 12) are closed. Valve 26 (in flow line 6) is open.
Gravitation vessel 1 has a ventilation line 27 provided with a valve 28. Valve 28 is opened when there is a need for ventilation or aeration.
When sand flushing is desired, the flushing can be done by using sea water. This type of flushing will usually have a duration of the order of 1/2 to 2 minutes, and can be carried out at intervals ranging from a few days to several months, depending on the solids/sand production. For flushing using sea water, the valves 22, 25 and 24 are open. Valves 20 and 19 may be either open or closed, depending on what is most advantageous based on a process evaluation in the individual situation.
Flushing may also be carried out by using the well stream (oil, gas and water). For this type of flushing, valve 17, valve 20 and valve 18 are closed. Pump 5 is stopped, and valves 23 and 22 are opened. The well stream will thereby be conducted to flush device 13, which has nozzles for discharging the flushing medium against the bottom of separator chamber 2.

Claims

P a t e n t C l a i m s
1.
A method of gravitation separation of a hydrocarbon flow on the sea bed, where water and solids, primarily sand, are separated out in a gravitation vessel (1), and where a flushing and agitation of the separated solids is carried out at regular or irregular intervals in the gravitation vessel (1), and these are conducted to the well stream downstream of the gravitation separation, and where the separated water is pressurized by a reinjection pump (5) and reinjected into the ground, characterized in that sea water is supplied and pressurized by the reinjection pump (5) for separated water and is sent into the gravitation vessel (1) for flushing and agitation of the solids.
2.
A pressure flush device for flushing a gravitation separator (1) on the sea bed for a hydrocarbon flow which is supplied to the gravitation separator through a well stream flow line (6, 7), in which gravitation separator (1) there are separated out water and solids, said device comprising a line (4) for separated water from the gravitation separator (1), a reinjection pump (5) in the line (4), and a valve-regulated line (12) from the reinjection pump (5) back to a flush device (13) in the gravitation separator (1), characterized by a valve-regulated sea water line (15) connected to the line (4) for separated water upstream of the reinjection pump (5) for the supplying of sea water for flushing and agitation of the solids in the gravitation separator (1).
3. A pressure flush device according to claim 2, characterized by a valve- regulated branch line (14) from the well stream flow line (7) to the flush device (13).
PCT/NO1999/000001 1998-01-06 1999-01-05 Method of gravitation separation of a hydrocarbon flow and a pressure flush device for flushing a gravitation separator for a hydrocarbon flow WO1999035370A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU17895/99A AU1789599A (en) 1998-01-06 1999-01-05 Method of gravitation separation of a hydrocarbon flow and pressure flush device for flushing a gravitation separator for a hydrocarbon flow

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO980066 1998-01-06
NO980066A NO306311B1 (en) 1998-01-06 1998-01-06 Method of gravitational separation of a hydrocarbon well stream on the seabed and pressure flushing device for flushing a gravity separator on the seabed

Publications (1)

Publication Number Publication Date
WO1999035370A1 true WO1999035370A1 (en) 1999-07-15

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AU (1) AU1789599A (en)
NO (1) NO306311B1 (en)
WO (1) WO1999035370A1 (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2365046A (en) * 2000-07-25 2002-02-13 Schlumberger Holdings System and method for removing solid particulates from a pumped wellbore fluid
WO2003078793A1 (en) * 2002-02-28 2003-09-25 Abb Offshore Systems As Subsea separation apparatus for treating crude oil comprising a separator module with a separator tank
WO2006098636A1 (en) * 2005-03-16 2006-09-21 Norsk Hydro Asa Arrangement for the cleaning of a pipe separator
GB2433081A (en) * 2005-12-08 2007-06-13 Vetco Gray Inc Subsea well separation and reinjection system
US8771394B2 (en) 2008-08-15 2014-07-08 Aker Subsea Device for separating and collecting fluid in gas from a reservoir
CN104500008A (en) * 2014-12-15 2015-04-08 中国石油天然气股份有限公司 Integrated device for clean water injection
WO2018093456A1 (en) 2016-11-17 2018-05-24 Exxonmobil Upstream Research Company Subsea reservoir pressure maintenance system
WO2018102008A1 (en) 2016-12-01 2018-06-07 Exxonmobil Upstream Research Company Subsea produced non-sales fluid handling system and method
EP3271548A4 (en) * 2015-03-16 2018-10-24 Seabed Separation AS Method and system for subsea purification of produced water from subsea oil producing installations
EP3789098A1 (en) * 2019-09-06 2021-03-10 Saipem S.A. System for collecting solid particles accumulating at the bottom of an underwater station for separating oil/water

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2226963A (en) * 1988-12-22 1990-07-18 Norwegian Contractors Processing crude oil
US5032273A (en) * 1984-09-10 1991-07-16 Senyard Sr Corley P Apparatus for separating sand and oil from a waste water stream
US5232475A (en) * 1992-08-24 1993-08-03 Ohio University Slug flow eliminator and separator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5032273A (en) * 1984-09-10 1991-07-16 Senyard Sr Corley P Apparatus for separating sand and oil from a waste water stream
GB2226963A (en) * 1988-12-22 1990-07-18 Norwegian Contractors Processing crude oil
US5232475A (en) * 1992-08-24 1993-08-03 Ohio University Slug flow eliminator and separator

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2365046B (en) * 2000-07-25 2002-10-09 Schlumberger Holdings System and method for removng solid particulates from a pumped wellbore fluid
GB2365046A (en) * 2000-07-25 2002-02-13 Schlumberger Holdings System and method for removing solid particulates from a pumped wellbore fluid
US7520989B2 (en) 2002-02-28 2009-04-21 Vetco Gray Scandinavia As Subsea separation apparatus for treating crude oil comprising a separator module with a separator tank
WO2003078793A1 (en) * 2002-02-28 2003-09-25 Abb Offshore Systems As Subsea separation apparatus for treating crude oil comprising a separator module with a separator tank
GB2402687A (en) * 2002-02-28 2004-12-15 Abb Offshore Systems As Subsea separation apparatus for treating crude oil comprising a separator module with a separator tank
GB2402687B (en) * 2002-02-28 2006-06-07 Abb Offshore Systems As Subsea separation apparatus for treating crude oil comprising a separator module with a separator tank
US7803233B2 (en) 2005-03-16 2010-09-28 Norsk Hydro Asa Arrangement for the cleaning of a pipe separator
NO328370B1 (en) * 2005-03-16 2010-02-01 Norsk Hydro As Device comprising a rudder separator and a method of using the device.
WO2006098636A1 (en) * 2005-03-16 2006-09-21 Norsk Hydro Asa Arrangement for the cleaning of a pipe separator
CN101142373B (en) * 2005-03-16 2011-07-06 诺尔斯海德公司 Arrangement for the cleaning of a pipe separator
GB2433081A (en) * 2005-12-08 2007-06-13 Vetco Gray Inc Subsea well separation and reinjection system
US7686086B2 (en) 2005-12-08 2010-03-30 Vetco Gray Inc. Subsea well separation and reinjection system
GB2433081B (en) * 2005-12-08 2010-10-06 Vetco Gray Inc Subsea well separation and reinjection system
US8771394B2 (en) 2008-08-15 2014-07-08 Aker Subsea Device for separating and collecting fluid in gas from a reservoir
CN104500008A (en) * 2014-12-15 2015-04-08 中国石油天然气股份有限公司 Integrated device for clean water injection
EP3271548A4 (en) * 2015-03-16 2018-10-24 Seabed Separation AS Method and system for subsea purification of produced water from subsea oil producing installations
WO2018093456A1 (en) 2016-11-17 2018-05-24 Exxonmobil Upstream Research Company Subsea reservoir pressure maintenance system
WO2018102008A1 (en) 2016-12-01 2018-06-07 Exxonmobil Upstream Research Company Subsea produced non-sales fluid handling system and method
US10539141B2 (en) 2016-12-01 2020-01-21 Exxonmobil Upstream Research Company Subsea produced non-sales fluid handling system and method
EP3789098A1 (en) * 2019-09-06 2021-03-10 Saipem S.A. System for collecting solid particles accumulating at the bottom of an underwater station for separating oil/water
FR3100460A1 (en) * 2019-09-06 2021-03-12 Saipem S.A. System for collecting solid particles accumulating at the bottom of an underwater oil / water separation station
US11603722B2 (en) 2019-09-06 2023-03-14 Saipem S.A. System for collecting solid particles accumulating at the bottom of a subsea oil/water separation station

Also Published As

Publication number Publication date
AU1789599A (en) 1999-07-26
NO980066L (en) 1999-07-07
NO306311B1 (en) 1999-10-18
NO980066D0 (en) 1998-01-06

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