Hydrocarbon recovery process

E - Fixed Constructions – 21 – B

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E21B 43/16 (2006.01) C09K 8/58 (2006.01) E21B 43/20 (2006.01)

Patent

CA 2662295

Hydrocarbons are recovered from subterranean formations by waterflooding. The method comprises passing an aqueous displacement fluid via an injection well through a porous and permeable sandstone formation to release oil and recovering said released oil from a production well spaced from said injection well, wherein (a) the sandstone formation comprises at least one mineral having a negative zeta potential under the formation conditions; (b) oil and connate water are present in the pores of the formation; and (c) the fraction of the divalent cation content of the said aqueous displacement fluid to the divalent cation content of said connate water is less than 1.

Des hydrocarbures sont récupérés à partir de formations souterraines par inondation. Le procédé comprend les opérations consistant à faire passer un fluide de déplacement aqueux via un puits d'injection à travers une formation de grès poreuse et perméable pour libérer du pétrole, et à récupérer ledit pétrole libéré à partir d'un puits de production situé à une certaine distance dudit puits d'injection. Selon la présente invention, (a) la formation de grès comprend au moins un minéral ayant un potentiel zêta négatif dans les conditions de la formation; (b) du pétrole et de l'eau de gisement sont présents dans les pores de la formation; et (c) la fraction de la teneur en cations divalents dudit fluide de déplacement aqueux sur la teneur en cations divalents de ladite eau de gisement est inférieure à 1.

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