Smith, G.C., S.
Goodworth, A. Johnson, S. Polomka, M. Rice, L. White, Woodside Energy Ltd,
The Chinguetti Field was discovered in 2001 offshore
The main subsurface uncertainties identified as part of the field development studies were: channel amalgamation, fault seal, hydrocarbon contacts, channel distribution, rockfluid interaction and fluid composition. These and other uncertainties were assessed using a statistical Experimental Design for 27 scenarios to model the probability distribution of reserves. A 3D model for each was run through a dynamic simulator to estimate economic ultimate recovery which is more rigorous than using mid, high and low case models.
The discovery well, 2 appraisal wells and an early development well (with an extended production test) were used with 3D seismic to design the Field Development Plan. The first phase of the FDP includes 6 producers and 5 injectors. Development drilling began late 2004 and should be complete by mid 2005. Intersecting the axis of channel systems at several levels has been the main subsurface challenge since: the axes of the channel systems are not vertically stacked; the seismic resolution is not able to clearly image the individual channels; and the wells are highly deviated from pre-determined manifolds.