The Tartaruga light oil field was discovered in 1994. The well discovered oil in a sandstone that normally does not contain oil. The discovery well was put on production almost immediately. After producing free flowing oil for almost 14 months, the Operator recompleted the well to a shallower zone. This zone still produces light oil without artificial lift.
In 2008 a second well was drilled to appraise the structure. A deeper target was penetrated, and although the penetration point is clearly off the structure, the Operator believed that an oil water contact was discovered. 3D seismic has been acquired over the block and the deeper objective is clearly defined and it is likely that a well in a structurally better position will encounter hydrocarbons.
In 2010 a sidetrack was drilled from the 2008 well to access oil in the producing reservoir. A Drill Stem Test (DST) conducted in a deeper pay zone yielded oil, but mechanical problems during the test prevented the zone from being completed. The Operator moved up hole and completed the same zone that was produced during the 1994 – 1996 period.
The second well on the Tartaruga Field has only been in intermittent production since 2010, mainly due to problems with the Electrical Submersible Pump (ESP). In 2015, the Operator changed the artificial lift system to a jet pump in order to address the shortcomings of an ESP. The well has been producing at maximum pump capacity since December 2015.
The field is currently producing from two wells and has produced over 750,000 bbls since the discovery.