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Geological Society, London, Special Publications; 1995; v. 84; p. 197-208;
DOI: 10.1144/GSL.SP.1995.084.01.20
© 1995 Geological Society of London

Oil Rim Development

Improving oil recovery from Oseberg Gamma North using horizontal wells

T. Madsen, O. Lie & M. Velvin

Norsk Hydro A.S., N-5020 Bergen, Norway

The Oseberg Gamma North field is a small satellite to the Oseberg field. The reservoir is a tilted heterogeneous sand package with a thin oil zone between a gas cap and an aquifer. The field has been produced from one horizontal subsea well since October 1991. The main reason for the development is to supply gas for injection in the Oseberg field, but also to optimize oil recovery.

In planning the development of a small field like Gamma North, particular attention must be paid to existing uncertainties in geology and reservoir conditions, concept feasibility and cost. Our strategy at Oseberg Gamma North therefore emphasizes flexibility by allowing stepwise decisions to be made as more detailed reservoir information becomes available.