Pilar oil and gas field, located onshore northeastern region of Brazil, had the production peak by 1985, when produced 1300 m3/d of oil, decreasing since then until reaching 350 m3/d in 1997. Forecasts at that time indicated a very low oil production of about 200 m3/d by year in 2002.

A study was launched in 1997, strongly focused on the characterization of sealing fault planes that control the oil and gas accumulations, which resulted in the projects of deviated wells, following the fault planes. This approach has made possible to drill one single well crossing multiple sets of reservoirs, increasing the possibility of finding virgin reservoirs along trends of producing reservoirs.

As a result, the oil rate has been rising since 1998, reverting the declining tendency of the period between 1985 and 1997. In 2003 the oil rate reached 1100 m3/d. In the period of revitalization, the OOIP has increased 50%.

Keywords:
production history, estimates of resource in place, closure, pilar field, society of petroleum engineers, well trajectory, recovery, fracture characterization, oil rate, accumulation
Subjects:
Well Planning, Well & Reservoir Surveillance and Monitoring, Reservoir Characterization, Improved and Enhanced Recovery, Reservoir Simulation, Formation Evaluation & Management, Reserves Evaluation, Asset and Portfolio Management, Trajectory design, Faults and fracture characterization
Copyright 2004, Society of Petroleum Engineers
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