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Tecpetrol, PetroNova extend Llanos oil discovery

Tecpetrol Colombia and PetroNova Inc., Calgary, have tested oil at a stepout from a 2012 oil discovery on the CPO-7 block in the Llanos basin in Colombia.

The companies ran the test at Atarraya-4, drilled directionally from the Atarraya-1 surface pad to a bottomhole location 2,625 ft southwest from Atarraya-1, where they made a hydrocarbon discovery last year (OGJ Online, May 9, 2012).

Atarraya-4 went to a total depth of 4,841 ft true vertical depth, 5,640 ft measured depth, and mud and electric logs indicated the presence of 25 ft of net oil sand at the top of the C7 Carbonera unit. Production casing was cemented and the well tested on hydraulic jet pump and electric submersible pumps.

Production tests of a gravel-packed interval at 5,204-21 ft at the top of the Carbonera unit yielded 1,000 b/d of fluid with an 11.2% water cut. Net production was 880 b/d of 21.4° gravity oil at a relatively low ESP frequency of 32 Hz, PetroNova said.

The companies completed Atarraya-4 in the upper C7 Carbonera and expect to run an extended production test after obtaining permits.

Atarraya-4 is the fifth well in the drilling campaign on CPO-7, in which PetroNova has a 20% working interest. Next Tecpetrol and PetroNova will directionally drill Atarraya-3 from the same pad to a bottomhole location 2,296 ft northeast from the Atarraya-1 location.


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