Handling heavy subsea structures

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...

Full description

Saved in:
Bibliographic Details
Main Author Daasvatn, Sigbjorn
Format Patent
LanguageEnglish
Published 01.06.2017
Subjects
EARTH DRILLING
EARTH DRILLING, e.g. DEEP DRILLING
FIXED CONSTRUCTIONS
MINING
OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS
Online AccessGet full text

Cover

More Information
Summary: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.
Bibliography:Application Number: AU20150341739