Offshore Oil and Gas Compliant Tower
Rig Jobs.
Compliant towers are designed to uphold considerable sideways
deflections and forces, and are generally used in water depths between 1,500 to
3,000 feet (450 to 900 m). At present the Chevron Petronius tower is the
deepest in the sea depth of 623 meters.
A compliant tower
(CT) is a fixed rig erection usually used for the offshore oil and gas production. The compliant
tower rig built up of thin, flexible or compliant towers and a stacked base supporting a standard deck
for drilling and production operations.
Flex parts such as flex legs or axial tubes are used to lower
the resonance and to suppress the wave forces. The compliant tower rig construction can
be configured to fit to already present fabrication and installation equipment.
When seen with floating systems, such as tension-leg platforms and Spars, the
production risers are typical and are subjected to less structural requirement
and bending.
Though, for the reason of high expenditure, it becomes too
expensive to set up compliant towers in water depths more than 1,000 meters. So
in water depths more than 1000 m a floating production system is more suitable,
yet with the increased expense of risers and mooring. Even with its
flexibility, the compliant tower system is tough enough to withstand hurricane situations.
The first compliant tower came into existence in the beginning
of 1980s with the installation of Exxon's Lena oil platform. The base tower of Benguela Belize was
released from the barge H-851 in mid April 2005. The base tower only comprises
the first 250 metres of the more than 400 meter high tower. The derrick vessel Thialf
was deployed for the heavy lifts. It is the primary outside of the Gulf of
Mexico and is the heaviest compliant tower erected so far.
