Title:
HANDLING HEAVY SUBSEA STRUCTURES
Document Type and Number:
WIPO Patent Application WO/2016/071471
Kind Code:
A3
Abstract:
A method for transporting and installing a heavy subsea structure such as a subsea processing centre (10) for produced crude oil or natural gas. The method comprises: controlledly flooding at least one ballast tank (52) attached to or incorporated into the structure, to the extent that the structure becomes negatively buoyant at a predetermined towing depth; towing the negatively-buoyant structure at the towing depth by the Controlled Depth Towing Method (CDTM); and, after towing to the installation location, further flooding the ballast tank to lower the structure onto the seabed (64). At the seabed, a fluid transportation pipe (90) of a subsea production installation may be coupled to pipework of the structure.
Inventors:
DAASVATN SIGBJØRN (NO)
Application Number:
PCT/EP2015/075863
Publication Date:
June 30, 2016
Filing Date:
November 05, 2015
Export Citation:
Assignee:
SUBSEA 7 NORWAY AS (NO)
International Classes:
E21B41/00; E21B43/017; E21B43/36
Domestic Patent References:
| WO2010144187A1 | 2010-12-16 |
Foreign References:
| GB2464714A | 2010-04-28 | |||
| GB2509165A | 2014-06-25 | |||
| GB2279098A | 1994-12-21 | |||
| CA1042673A | 1978-11-21 | |||
| US5215410A | 1993-06-01 | |||
| EP0260143A2 | 1988-03-16 |
Attorney, Agent or Firm:
CUMMINGS, Sean et al. (No. 1 London Bridge, London SE1 9BA, GB)
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