CEIBA, RIO
MUNI BASIN, EQUATORIAL GUINEA
Triton's
Ceiba field is located in Block G of the Rio Muni Basin,
22 miles off the continental coast of Equatorial Guinea
and approximately 150 miles south of the country's capital,
Malabo. Triton is the operator (85% share) of Blocks F
and G, with South Africa-based Energy Africa holding the
remaining 15% equity.
SEISMIC
Prior
to drilling, Triton purchased 4,200km² of seismic
data concerning Block G, as well as the adjacent Block
F.
GEOLOGY
The
permeability ranges between 1mD to 1D and the porosity
is 20-30%. It has an oil saturation of 30-70% and a GOR
of 550ft/bbl.
DISCOVERY
Ceiba
was discovered on 6 October 1999, following the drilling
and testing of the discovery well. The well was drilled
to 9,700ft in approximately 2,200ft of water. It flowed
12,401 barrels of oil per day (BOPD), of 30 deg oil, from
a 742ft gross oil column (net oil-bearing pay of 314ft
in four zones). The well had a flowing tubing pressure
of 897psi.
The
Ceiba-2 appraisal well, announced 22 November 1999, confirmed
the field as a commercial oil discovery. The Ceiba-2 well
was drilled approximately one mile to the southwest and
342ft down-dip of the Ceiba-1 well. It encountered net
oil-bearing pay of 300ft in a single, continuous column.
It was drilled to a total depth of 8,744ft in 2,347ft
of water.
Ceiba-3
well was drilled to a total depth of 9,695ft in 2,165ft
of water. It penetrated 256ft of net oil-bearing pay.
The new additional reservoir has an oil-water contact,
about 60ft deeper than the oil-water contact found in
the first two wells.
Ceiba-4
well was drilled to a total depth of 8,957ft in 2,431ft
of water. It penetrated 269ft of net oil-bearing pay.
Ceiba-5,
a significant step-out well, penetrated 243ft of net oil-bearing
pay. Drilled on the western flank of the Ceiba structure,
the well validated the lateral reservoir continuity and
connectivity. In addition, the new pool has shown a significantly
deeper oil-water contact than encountered elsewhere in
the field.
The
new oil pool has an oil-water contact 328ft below the
that of the primary Ceiba pool. The Ceiba-5 well was drilled
to a total depth of 9,187ft in 2,622ft of water. The well
is approximately 1.75 miles north-west and 50ft down-dip
of the Ceiba-3 development well.
The
drilling programme was carried out by two semisumbersibles
- Global Marine's RF Bauer and the Sedco 700 rig.
FIELD
DEVELOPMENT
The
Ceiba field came on-stream in 2001.
Triton
has signed a multi-year leasing contract with Bergesen,
to lease a floating production storage and offloading
(FPSO) vessel. The 275,000dwt turbine tanker called Sendje
Berge was being converted in the Jurong Shipyard, in Singapore.
Originally
a very large crude carrier (VLCC), it measures approximately
350m (1150ft) in length and 52m (170ft) in width. It has
an oil storage capacity of two million barrels.
FPSO
specifications include an initial on-board processing
capacity of 60,000bopd. Provisions are being made during
the conversion, to facilitate the addition of production
modules up to a combined capacity of 240,000bopd, should
future field appraisal demonstrate that it is required.
Consideration was made for the future addition of water-
and gas-injection facilities.
The
EPCI contract for the FPSOs for the complete upgrade of
the FPSO was won by ABB. The delivery included two separation
modules, water injection module, utility/ subsea module,
manifolds, flare packages and a number of packages within
the vessel systems.
The
engineering and procurement were carried out in-house,
while the construction and other work was conducted in
Thailand. ABB was also responsible for Bergesen installation
and commissioning work in Singapore and offshore.
SUBSEA
Cameron
provided the wellheads, subsea production trees, pipeline
end manifolds and the production-control system for four
wells. It also provided the production and control lines
between the subsea production tree and the pipeline end
manifold.
|
"Email
me the details on this project including more about
how I can apply for work."
|
|
|
Map
of well locations
The
Sedco 700 testing Ceiba-4.
The
Sedco 700 testing Ceiba-4.
The
Sedco 700 testing Ceiba-4.
Map
showing location of Equatorial Guinea and block F and
G.
Trace
showing oil and gas in wells, Ceiba-1 to 4.
Seismic
map with well locations.
Schematic
of field development.
|
|
..
