By OGJ editors
HOUSTON, Dec. 13 -- Heritage Oil Corp., Calgary, is planning its next exploration well on Uganda's remote Albert graben after encountering imprecisely gauged volumes of carbon dioxide and hydrocarbon gas at its latest penetration.
Heritage drilled Turaco-3 to TD 2,850 m and logged two potential hydrocarbon-bearing zones containing a stacked sequence of sands and shales. The company calculated 84 m of net pay with 24% average porosity from logs in the sequence of more than 350 m of gross pay.
Flow rates on three through-casing drillstem tests limited by surface test equipment capacity were 8-12 MMcfd of gas on 20/64 to 28/64-in. chokes and 1,200-1,600 psi wellhead flowing pressures. Heritage extrapolated the flow rates to a combined 60 MMcfd under production conditions.
Hydrates formed during testing, and special equipment and heaters will be required for further tests.
Heritage could not quantify the hydrocarbon component of the gas stream. The well cut consolidated reservoir sands with 200-500 MD of inferred permeability. Gas samples under pressure were shipped for analysis.
Heritage acquired a 390 sq km 3D seismic survey and launched a further 2D transition zone survey linking existing land and Lake Albert seismic data (OGJ, June 10, 2002, p. 42).
