Pore salt content influences oil displacement efficiency

Experiments have determined that salt contained in pores changes the displacement efficiency in a stratified heterogeneous formation.The laboratory experiments investigated the hard salt in the pore space of oil-saturated samples from the Verkhnechonsky gas-condensate field in East Siberia (Russia). Displacement fluids consisted of freshwater and water with chemical additives.Distinctive features of the terrigenous formations in the Verkhnechonsky field include:Abnormally low original reservoir pressure, which is less than hydrostatic.Low reservoir temperature, 14-20° C. (57-60° F.).High saline formation water, about 400 g/l.Salt sections in the producing formations. Water-solub...

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