PROCESS FOR RECOVERY OF OIL FROM AN OIL-BEARING FORMATION

摘要

The present invention is directed to a process for producing oil. The mass action ratio (MAR) of divalent cations to monovalent cations of water from an oil-bearing formation is determined, and an aqueous displacement fluid having a total dissolved solids content of from 200 ppm to 5,000 ppm and a MAR of divalent cations to monovalent cations of from 70% to 130% of the MAR of divalent cations to monovalent cations of the formation water is introduced into the formation. Oil is produced from the formation after introducing the aqueous displacement fluid into the formation.

主权项

1. A process for producing oil from an oil-bearing formation, comprising:
determining the mass action ratio of divalent cations to monovalent cations of water from the oil-bearing formation; providing an aqueous displacement fluid comprising water and an ionically charged polymer, wherein the water of the aqueous displacement fluid has a total dissolved solids content of from 200 parts per million by weight (ppmw) to 5,000 ppmw and a mass action ratio of divalent cations to monovalent cations from 70% to 130% of the mass action ratio of divalent cations to monovalent cations of the water from the oil-bearing formation; introducing the aqueous displacement fluid into the oil-bearing formation to displace oil within the formation; producing oil from the oil-bearing formation subsequent to introducing the aqueous displacement fluid into the formation.