Eric Watkins
Senior Correspondent
LOS ANGELES, July 12 -- Gran Tierra Energy Inc., Calgary, reported that its recently drilled Costayaco-1 exploration well on Chaza block in Putumayo basin in southern Colombia tested at a combined rate of 5,906 b/d of oil.
"Successful test results have established the presence of a significant oil accumulation," said Gran Tierra Energy Pres. and CEO Dana Coffield. He said planning has been initiated for development, including additional drilling and new pipeline and facility infrastructure, to optimize development of the field through 2007 and into 2008.
Gran Tierra said its cased-hole, drill stem test (DST) program commenced on June 10 and that six DSTs were completed over the Lower Caballos formation, Middle Caballos formation, Lower and Middle Villeta T formations, the Villeta U formation, and the Rumiyaco Kg formation.
It said that in the six formations tested, production was obtained at a combined flow rate of up to 5,906 b/d of 23-31° gravity oil, including one zone that flowed with a jet pump.
Gran Tierra announced on June 20 the completion of three DSTs in the lower three zones, with production at a combined natural flow rate of up to 3,997 b/d obtained from the three zones.
It said three DSTs over three additional zones have been completed, resulting in additional production at a combined natural flow rate of up to 1,489 b/d plus an additional 420 b/d that flowed with a jet pump.
Gran Tierra, which serves as block operator, holds equal working interest with Solana Resources Ltd. (formerly Adulis Resources Inc.), Calgary.
Contact Eric Watkins at [email protected].
