Petroleo Brasileiro SA (PBR, PETR4.BR), or Petrobras, has started a long-term test at the Lula field in Brazil's offshore Santos Basin, 300 kilometers from the coast of Rio de Janeiro state, the company said Thursday.

The test is designed to produce 14,000 barrels a day of oil.

Petrobras holds a 65% stake in Lula. BG Group PLC (BG.LN) has a 25% stake and
Portugal 's Galp Energia (GALP.LB) controls the remaining 10%.