Colombia's Rancho Hermoso oil field growing

By OGJ editors
HOUSTON, Feb. 25
-- Canacol Energy Ltd., Calgary, will drill as many as seven development wells starting in late second quarter 2011 in Rancho Hermoso field in the northwestern Llanos basin in Colombia, where its latest development well tested oil from five formations including one new field pay.

The RH 10 well went to a total depth of 10,305 ft and cut 110 ft of net oil pay in Ubaque, Guadalupe, Los Cuervos-Barco, Mirador, and new pay Carbonera C7 formations. Combined production rate totaled 26,286 b/d of oil.

The well previously tested a combined 19,066 b/d of oil from the Ubaque and Guadalupe reservoirs.

Los Cuervos-Barco, with 19 ft of net oil pay with 26% average porosity, stabilized at 6,791 b/d of 34° gravity oil with 28% water cut on an electric submersible pump from perforations at 9,410-25 ft measured depth. Mirador had 9 ft of oil pay with 25% average porosity.

The C7 tried to blow out when perforated at 8,962-74 ft MD. Bull heading brought the well under control in 3 days, after which the formation made 429 b/d of 34° gravity oil with 10% load water cut on an ESP. Formation damage is probable, and the zone is to be properly stimulated and tested in future wells.

The C7 is present and oil-bearing in the majority of the field’s wells, and Canacol will formulate a development plan.

The well is to be completed next week in the Ubaque, which tested at 8,122 b/d. RH 10 is the last of a five-well development program begun in mid-2010. The 2011 seven-well program is directed at all reservoirs except C7.



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