Specific features of a new concept for deepwater flow-line laying and connecting and its sea trial in 250 meters
Conference
·
· Offshore Technol. Conf.; (United States)
OSTI ID:5445204
A new diverless method for deep water laying and connecting a flowline bundle linking a production well to a subsea manifold has been developed. A specifically developed system was used and no flowline length adjustment was required ''in situ''. The flowline bundle assembly is fabricated and tested on-shore, before its launching and towing. After the first phase of towing, the bundle is submerged to 30 m. The bundle is then pulled near the sea-floor with the guide rope method to the site where two base structures with acoustic transponders have been installed. The bundle is positioned by an acoustic system. Two structures bearing a sheave for the pulling cables are lowered to the sea bottom and stabbed to the two bases respectively. All re-entries are performed by the acoustic guidelineless drilling method. Final direct or side pulling is done by winches and heave compensators on board a drilling vessel which is successively dynamically positioned on top of each base. The side pulling is monitored by an acoustic system. After pulling, each end of the bundle is latched to the structure. Using drill pipes the connecting modules are stabbed to the pulling structures, then a vertical connection to each end of the flowline is performed. (see fig. 1) A sea trial of this method was successfully performed in 250 meter water depth in the Mediterranean Sea in May 1981.
- Research Organization:
- Societe Nationale Elf Aquitaine
- OSTI ID:
- 5445204
- Report Number(s):
- CONF-830514-
- Conference Information:
- Journal Name: Offshore Technol. Conf.; (United States) Journal Volume: 2
- Country of Publication:
- United States
- Language:
- English
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