Patents by Inventor Sigbjorn Daasvatn
Sigbjorn Daasvatn has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20240051740Abstract: A subsea fluid storage system comprises: a seabed foundation; a tensile member such as a pipe or a wire extending upwardly from the foundation; and a subsea buoy applying buoyant upthrust to support the tensile member in an upright orientation. At least one fluid storage container is disposed between the foundation and the buoy. The or each container may be disposed around the tensile member, for example with the tensile member extending through the container. The container has at least one inlet or outlet for fluid communication with a source or a consumer of fluid to be stored in the container.Type: ApplicationFiled: December 17, 2021Publication date: February 15, 2024Inventors: Morten Saeterdal, Sigbjorn Daasvatn
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Patent number: 11891241Abstract: A modular subsea fluid storage unit has a variable-volume inner tank having a rigid top panel and a peripheral wall that is flexible by virtue of concertina formations. The peripheral wall is extensible and retractable vertically while the horizontal width of the tank remains substantially unchanged. A side wall of a lower housing part surrounds and is spaced horizontally from the peripheral wall of the inner tank to define a floodable gap between the peripheral wall and the side wall that surrounds the tank. An upper housing part extends over and is vertically spaced from the top panel of the inner tank and overlaps the side wall to enclose the inner tank. The floodable gap and the upper housing part enhance thermal insulation and trap any fluids that may leak from the inner tank.Type: GrantFiled: July 8, 2019Date of Patent: February 6, 2024Assignee: SUBSEA 7 NORWAY ASInventors: Morten Saeterdal, Sigbjorn Daasvatn
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Patent number: 11598193Abstract: A subsea production unit for subsea treatment of oil has a frame that supports an onboard multiphase separation system for separating gas and water from a wellstream containing oil. The subsea production unit also includes an onboard water treatment system for cleaning oil from water that is produced by the separation system.Type: GrantFiled: April 18, 2018Date of Patent: March 7, 2023Assignee: Subsea 7 Norway ASInventor: Sigbjorn Daasvatn
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Patent number: 11577180Abstract: A subsea multiphase fluid separation system has a gas separator for separating gas from a well stream containing oil. A water separation stage downstream of the gas separator has at least one dual pipe separator for separating water from the oil of the wellstream. A water treatment system for cleaning oil from water is produced by the water separation stage. On an oil outlet path, downstream of the or each dual pipe separator, there is an electrocoalescer and at least one second separator in series.Type: GrantFiled: April 18, 2018Date of Patent: February 14, 2023Assignee: Subsea 7 Norway ASInventors: Sigbjorn Daasvatn, Ratnam Sathananthan
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Patent number: 11421486Abstract: A subsea hydrocarbon export system includes a riser tower having a riser column extending from a seabed location to a sub-surface buoy that supports the riser column in an upright orientation. A subsea connector is operable underwater to couple the riser column temporarily to a hose suspended from a surface shuttle tanker vessel for an export operation and to release the hose after the export operation.Type: GrantFiled: July 3, 2018Date of Patent: August 23, 2022Assignee: Subsea 7 Norway ASInventors: Sigbjorn Daasvatn, Daniel Karunakaran
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Publication number: 20220033177Abstract: A modular subsea fluid storage unit comprises a variable-volume inner tank having a rigid top panel and a peripheral wall that is flexible by virtue of concertina formations. The peripheral wall is extensible and retractable vertically while the horizontal width of the tank remains substantially unchanged. A side wall of a lower housing part surrounds and is spaced horizontally from the peripheral wall of the inner tank to define a floodable gap between the peripheral wall and the side wall that surrounds the tank. An upper housing part extends over and is vertically spaced from the top panel of the inner tank and overlaps the side wall to enclose the inner tank. The floodable gap and the upper housing part enhance thermal insulation and trap any fluids that may leak from the inner tank.Type: ApplicationFiled: October 15, 2021Publication date: February 3, 2022Inventors: Morten Saeterdal, Sigbjorn Daasvatn
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Publication number: 20210269234Abstract: A modular subsea fluid storage unit has a variable-volume inner tank having a rigid top panel and a peripheral wall that is flexible by virtue of concertina formation. The peripheral wall is extensible and retractable vertically while the horizontal width of the tank remains substantially unchanged. A side wall of a lower housing part surrounds and is spaced horizontally from the peripheral wall of the inner tank to define a floodable gap between the peripheral wall and the side wall that surrounds the tank. An upper housing part extends over and is vertically spaced from the top panel of the inner tank and overlaps the side wall to enclose the inner tank. The floodable gap and the upper housing part enhance thermal insulation and trap any fluids that may leak from the inner tank.Type: ApplicationFiled: July 8, 2019Publication date: September 2, 2021Inventors: Morten Saeterdal, Sigbjorn Daasvatn
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Patent number: 11091995Abstract: A wax control element for subsea processing of well fluids in a wellstream comprises a bundle of flowlines within an elongate tensile structure. That structure defines inlet and outlet ends and has cooling and heating provisions that act on the flowlines, in use, to promote deposition of wax in the flowlines and subsequent entrainment of wax in the wellstream.Type: GrantFiled: August 29, 2018Date of Patent: August 17, 2021Assignee: Subsea 7 Norway ASInventors: Ratnam Sathananthan, James Arkley Pollock, Sigbjorn Daasvatn
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Publication number: 20210148173Abstract: A subsea hydrocarbon export system includes a riser tower having a riser column extending from a seabed location to a sub-surface buoy that supports the riser column in an upright orientation. A subsea connector is operable underwater to couple the riser column temporarily to a hose suspended from a surface shuttle tanker vessel for an export operation and to release the hose after the export operation.Type: ApplicationFiled: July 3, 2018Publication date: May 20, 2021Inventors: Sigbjorn Daasvatn, Daniel Karunakaran
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Patent number: 10890051Abstract: A method transports and installs a heavy subsea structure such as a subsea processing center for produced crude oil or natural gas. The method includes controlledly flooding at least one ballast tank attached to or incorporated into the structure to the extent that the structure becomes negatively buoyant at a pre-determined towing depth. The method also includes towing the negatively-buoyant structure at the towing depth by the Controlled Depth Towing Method (CDTM). After towing to the installation location, the method includes further flooding the ballast tank to lower the structure onto the seabed. At the seabed, a fluid transportation pipe of a subsea production installation may be coupled to pipework of the structure.Type: GrantFiled: October 7, 2019Date of Patent: January 12, 2021Assignee: Subsea 7 Norway ASInventor: Sigbjorn Daasvatn
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Publication number: 20200378234Abstract: A subsea production unit for subsea treatment of oil has a frame that supports an onboard multiphase separation system for separating gas and water from a wellstream containing oil, and an onboard water treatment system for cleaning oil from water that is produced by the separation system.Type: ApplicationFiled: April 18, 2018Publication date: December 3, 2020Inventor: Sigbjorn Daasvatn
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Publication number: 20200139266Abstract: A subsea multiphase fluid separation system has a gas separator for separating gas from a well stream containing oil. A water separation stage downstream of the gas separator has at least one dual pipe separator for separating water from the oil of the wellstream. A water treatment system for cleaning oil from water is produced by the water separation stage. On an oil outlet path, downstream of the or each dual pipe separator, there is an electrocoalescer and at least one second separator in series.Type: ApplicationFiled: April 18, 2018Publication date: May 7, 2020Inventors: Sigbjorn Daasvatn, Ratnam Sathananthan
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Publication number: 20200040706Abstract: A method transports and installs a heavy subsea structure such as a subsea processing center for produced crude oil or natural gas. The method includes controlledly flooding at least one ballast tank attached to or incorporated into the structure to the extent that the structure becomes negatively buoyant at a pre-determined towing depth. The method also includes towing the negatively-buoyant structure at the towing depth by the Controlled Depth Towing Method (CDTM). After towing to the installation location, the method includes further flooding the ballast tank to lower the structure onto the seabed. At the seabed, a fluid transportation pipe of a subsea production installation may be coupled to pipework of the structure.Type: ApplicationFiled: October 7, 2019Publication date: February 6, 2020Inventor: Sigbjorn Daasvatn
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Patent number: 10435991Abstract: A method transports and installs a heavy subsea structure such as a subsea processing center for produced crude oil or natural gas. The method includes controlledly flooding at least one ballast tank attached to or incorporated into the structure to the extent that the structure becomes negatively buoyant at a pre-determined towing depth. The method also includes towing the negatively-buoyant structure at the towing depth by the Controlled Depth Towing Method (CDTM). After towing to the installation location, the method includes further flooding the ballast tank to lower the structure onto the seabed. At the seabed, a fluid transportation pipe of a subsea production installation may be coupled to pipework of the structure.Type: GrantFiled: November 5, 2015Date of Patent: October 8, 2019Assignee: Subsea 7 Norway ASInventor: Sigbjorn Daasvatn
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Publication number: 20180371888Abstract: A wax control element for subsea processing of well fluids in a wellstream comprises a bundle of flowlines within an elongate tensile structure. That structure defines inlet and outlet ends and has cooling and heating provisions that act on the flowlines, in use, to promote deposition of wax in the flowlines and subsequent entrainment of wax in the wellstream.Type: ApplicationFiled: August 29, 2018Publication date: December 27, 2018Inventors: Ratnam Sathananthan, James Arkley Pollock, Sigbjorn Daasvatn
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Patent number: 10066472Abstract: A wax control element for subsea processing of well fluids in a wellstream comprises a bundle of flowlines within an elongate tensile structure. That structure defines inlet and outlet ends and has cooling and heating provisions that act on the flowlines, in use, to promote deposition of wax in the flowlines and subsequent entrainment of wax in the wellstream.Type: GrantFiled: December 17, 2013Date of Patent: September 4, 2018Assignee: Subsea 7 Norway ASInventors: Ratnam Sathananthan, James Arkley Pollock, Sigbjorn Daasvatn
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Publication number: 20170314366Abstract: A method transports and installs a heavy subsea structure such as a subsea processing center for produced crude oil or natural gas. The method includes controlledly flooding at least one ballast tank attached to or incorporated into the structure to the extent that the structure becomes negatively buoyant at a pre-determined towing depth. The method also includes towing the negatively-buoyant structure at the towing depth by the Controlled Depth Towing Method (CDTM). After towing to the installation location, the method includes further flooding the ballast tank to lower the structure onto the seabed. At the seabed, a fluid transportation pipe of a subsea production installation may be coupled to pipework of the structure.Type: ApplicationFiled: November 5, 2015Publication date: November 2, 2017Applicant: Subsea 7 Norway ASInventor: Sigbjorn Daasvatn
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Patent number: 9644457Abstract: A towable unit for subsea processing of well fluids comprises a pipeline bundle extending between, and capable of acting in tension between, a first towhead at an upstream end of the bundle and a second towhead at a downstream end of the bundle. At least one of the towheads has an on-board processing facility for processing the well fluids, which facility effects at least separation of water phases that are present in the well fluids.Type: GrantFiled: December 17, 2013Date of Patent: May 9, 2017Assignee: Subsea 7 Norway ASInventors: Ratnam Sathananthan, Sigbjorn Daasvatn
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Patent number: 9457874Abstract: A method of overboarding and lowering a load from a vessel is disclosed. The method uses a vessel-mounted crane to lift the load from a deck of the vessel, to move the load off the deck into an outboard over-water position, and to lower the load from the outboard position into the water. The method further includes placing at least one guide member acting in compression between the load and an upstanding supporting structure of the crane to restrain horizontal movement of the load relative to a boom of the crane. Then, lowering the guide member occurs to continue restraining horizontal movement of the load while lowering the load from the outboard position into the water. A related guide apparatus includes at least one guide member that is movably connected to a mount for movement relative to the mount around and parallel to a slewing axis of the crane.Type: GrantFiled: May 23, 2013Date of Patent: October 4, 2016Assignee: Subsea 7 Norway ASInventors: Tore Jacobsen, Arun Prahash Kalyana Sundaram, Jarle Havn, Andrew Lewis, Sigbjorn Daasvatn
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Publication number: 20150345274Abstract: A towable unit for subsea processing of well fluids comprises a pipeline bundle extending between, and capable of acting in tension between, a first towhead at an upstream end of the bundle and a second towhead at a downstream end of the bundle. At least one of the towheads has an on-board processing facility for processing the well fluids, which facility effects at least separation of water phases that are present in the well fluids.Type: ApplicationFiled: December 17, 2013Publication date: December 3, 2015Inventors: Ratnam SATHANANTHAN, Sigbjorn DAASVATN