Process for improving waterflood performance in...

E - Fixed Constructions – 21 – B

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E21B 43/28 (2006.01) C09K 8/60 (2006.01)

Patent

CA 1214987

A PROCESS FOR IMPROVING WATERFLOOD PERFORMANCE IN HETEROGENEOUS CLAY-SENSITIVE FORMATIONS ABSTRACT A freshwater containing polyvalent cations and relatively few or no monovalent cations is injected into a heterogeneous clay-sensitive sub- terranean hydrocarbon-bearing formation via a well. The polyvalent cat- ion solution displaces the saline connate water in the near wellbore environment and contacts a first water-sensitive clay. The polyvalent cation solution exchanges polyvalent cations for monovalent cations in the first clay causing little clay damage while producing a monovalent cation solution which is thereafter displaced into the far wellbore environment. The monovalent cation solution contacts a second water- sensitive clay in the relatively highly permeable zones of the far well- bore environment to effect clay damage and reduce the permeability of the highly permeable zones in the far wellbore environment. The process results in improved waterflood sweep efficiency.

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