Abstract: Roncador Field, Appraisal and Development Planning
Pádua, Kleber; Mauro Mihaguti; Carlos Stank and Carlos Soares - Petrobras E&P
Roncador is a large (OOIP greater than 1 billion sm3) deep water (water depth from 1500 to 2000 m) field with a complex hydrocarbon distribution located in the northern part (120 km of São Tome Cape) of the prolific Campos Basin, Brazil.
The discovery well was drilled in October 1996 and showed a potential initial oil production rate of around 2000 sm3 /d with a 31° API oil gravity.
The field appraisal is currently underway and because of the geological uncertainties and operational risks it requires the construction of potential production forecast under various probable scenarios.
An interdisciplinary study is performed, together
with the drilling of appraisal wells, to plan the optimum field development
and the exploitation strategy. The study is based on integrated 3-D full
field geologic/reservoir
simulations which encompass surface and sub-surface
facilities. The work incorporates dynamically the data from appraisal wells
and estimates the field performance under diverse geologic models, fluid
behavior,
reservoir
characteristics,
drive
mechanisms
, completion schemes,
production configurations and surface facilities.
The results led to the design of a phased approach (early production system, Module 1, 2 and 3) with different alternatives depending on the geological scenario and the hydrocarbon characteristics. This would favor the financial planning and minimize the geological and operational risks of the project.
They also suggest a water injection secondary
recovery process encompassing vertical, deviated, horizontal and multilateral
wells with the purpose of maintaining reservoir
pressure above the bubble
point, accelerating the production and reducing the number of wells (slots).
The early production system, designed to accelerate
first oil and reservoir
characterization, is scheduled to come on stream
by the end of 1998. Module 1 is scheduled to come on stream next year with
a peak of oil production of 180 MSBOD by the year 2000. Both schemes, with
floating production system (FPS) and subsea wells, are flexible enough
to accommodate some new information from the appraisal phase, allowing
some optimization.
The poster presents the planning for the overall field exploitation, including the early production scheme and Module 1 and the technological constraints to overcome the water depth problems.
AAPG Search and Discovery Article #90933©1998 ABGP/AAPG International Conference and Exhibition, Rio de Janeiro, Brazil