Petroleo Brasileiro SA (Petrobras) confirmed the discovery of “good-quality” oil in reservoirs showing “excellent productivity” via its 3-BRSA-1305A-RJS well, also known as 3-RJS-739A, in the northwestern portion of the Libra block in the presalt Santos basin.
The well found a 270-m oil column and “high-quality” reservoirs in communication with other wells already drilled in the area. Two formation tests, conducted in two separate intervals, confirmed the reservoirs' productivity and 28º gravity oil, similar to what was found in the 2-ANP-2A-RJS and 3-RJS-731 wells (OGJ Online, Nov. 25, 2014).
Petrobras is currently drilling two other wells in the northwest portion of the Libra block: 3-BRSA-1322-RJS, also known as 3-RJS-741; and 3-BRSA-1339-RJS, also known as 3-RJS-742.
At 3-BRSA-1322-RJS, the oil carrier range was found through cable profiles—a record of hydrocarbon formations traversed by the well—and fluid samples, which will be characterized by laboratory analyses. The well is at a depth of 5,527 m. The drilling of 3-BRSA-1339-RJS, meanwhile, began on Feb. 6.
The three wells are part of the discovery assessment plan for well 2-ANP-2A-RJS submitted to Brazil’s National Petroleum Agency on Sept. 15, 2015, currently in the approval process.
The Libra consortium comprises operator Petrobras with 40% interest, Royal Dutch Shell PLC 20%, Total SA 20%, and China National Petroleum Corp. and CNOOC Ltd., each with 10%. Contract management is conducted by Pre-Sal Petroleo SA.