TOP 5 PROJECTS
Papa-Terra marks first use of dry tree
floating technology offshore Brazil
Petrobras started production from the Papa-Terra feld on Nov. 11, 2013. Papa-Terra is a heavy-oil feld in block BC- 20 of the Campos basin 110 km ( 68 mi) offshore Brazil in 1,190 m ( 3,903 ft) of water. Petrobras is operator with 62.5% interest while Chevron holds the remaining 37.5%.
Discovered in 2003, Papa-Terra’s reservoirs contain 14-17° API
crude. In January 2010, Petrobras and Chevron sanctioned the
$5.2-billion project that is estimated to recover 380 MMbbl of heavy
oil. Development consists of an FPSO, the frst tension leg wellhead
platform (TLWP) in Brazil, and a tender assisted drilling unit.
In February 2010, the Papa-Terra partners contracted BW Offshore
and QUIP to convert the 323,000-dwt ultra-large crude carrier BW Nisa
into the FPSO P- 63. QUIP contracted AMEC to perform basic engineering services for the topsides facilities that include three oil processing
modules; one gas compression module; three electrical power generation modules; two water treating and injection modules; one electrical
building module; three utilities modules; one fare system module; and
two manifold modules. The vessel was converted at the COSCO Shipyard in China, with fnal integration performed in Rio Grande, Brazil.
The FPSO P- 63 is 1,115 ft (340 m) long, 190 ft ( 58 m) wide and
92 ft ( 28 m) high and supports topsides that weighs 18,500 tons. It
has the capacity to produce up to 140,000 b/d of oil, to compress 35
MMcf/d ( 1 MMcm/d) of gas, and to inject 340,000 b/d of water.
The vessel will connect to fve producer wells and 11 injector
wells using 27 km ( 17 mi) of integrated production bundles (IPB)
of risers and fowlines from Technip. The IPB technological solution
increases the temperature of produced fuid after long shutdowns in
order to reduce viscosity and enable well production restart.
QUIP contracted Wärtsilä to supply three main power modules,
which each include two 18-cylinder 50DF tri-fuel engines in V-con-fguration, as well as alternators and auxiliary equipment. Wärtsilä
says this is the frst FPSO to employ gas engines to produce more
than 100 MWe of power. Hamworthy provided the cargo pump room
system, frewater pump system, and seawater lift pumps.
QUIP also awarded Veolia Water Solutions & Technologies a $39-mil-
lion contract to supply a water treatment package for the FPSO. The
equipment, designed to treat seawater, consists of pre-treatment and
seawater sulfate removal systems, which also will strip other divalent
ions from injection water to enhance oil recovery.
In April 2012, InterMoor installed 15 drilling and production conductors for the FPSO. Fabricated at its 24-acre facility in Morgan City, Louisiana, the conductors are 36 in. ( 91 cm) in diameter and 187 ft ( 57 m) long.
The company chartered the Skandi Skolten, DOF Subsea’s construction
anchor handling vessel, and the installation barge with a custom conductor launch system. For conductor driving, InterMoor used MENCK’s
MHU-270T DWS, which included a deepwater hydraulic hammer, at a
water depth of 3,281 ft ( 1,000 m) combined with MENCK’s girdle-type
electro-hydraulic power pack and umbilical support system. Generating
hydraulic power at depth, rather than at the surface, means no hydraulic
Cathelco supplied an impressed current cathodic protection (ICCP)
system to protect the under water surface of the hull against corrosion.
The ICCP incorporates four power units positioned throughout the
length of the vessel.
In May 2014, Chevron reported that the Brasil Voyager, a tanker
built specifcally to offoad oil from Papa-Terra, lifted about 740,000
bbl from the FPSO P- 63. The Brasil Voyager is expected to offoad
around 950,000 bbl from the feld every 40 days.
The month before, McDermott International completed the installation of the P- 61 TLWP at the Papa-Terra feld. The platform,
moored in 3,871 ft ( 1,180 m) of water, is South America’s frst TLWP
installation and the frst use of dry tree foating technology offshore
The TLWP resembles a semisubmersible, but is moored to the seafoor by vertical anchors. The arrangement is designed to suppress the
platform’s range of motions, allowing the use of dry christmas trees on
the deck of the platform. The project drew upon the proprietary technology, engineering, and construction resources of McDermott, Keppel, and
Anchored alongside the TLWP will be the SS- 88 tender assisted drilling semisubmersible platform. Built by Dalian Shipbuilding Industry
Co. in China and by Superior Derrick Services in the US, the SS- 88
will provide drilling and well completion services. P- 61 will connect to
13 production wells. All 18 Papa-Terra producer wells will be equipped
with submersible centrifugal pumps. Output from P- 61 will be transferred through multi-phase fow to the FPSO P- 63. First oil is expected
from P- 61 TLWP by the end of the year. •
Production from the P- 61 TLWP is expected to start by the end of the year.
(Photo courtesy Floa TEC)