Process for improving waterflood performance in heterogeneous cl

Details Process for improving waterflood performance in heterogeneous cl Process for improving waterflood performance in heterogeneous cl

1983-07-01

1984-10-23

Suchfield, George A.

Wells

Processes

Cementing, plugging or consolidating

166273, E21B 33138

Patent

active

044782837

ABSTRACT:
A freshwater containing polyvalent cations and relatively few or no monovalent cations is injected into a heterogeneous clay-sensitive subterranean hydrocarbon-bearing formation via a well. The polyvalent cation 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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Moore, "How to Combat Swelling Clays", The Petroleum Engineer, Mar. 1960, pp. 78-100.
Smith et al., "Potassium, Calcium Treatments Inhibit Clay Swelling", The Oil And Gas Journal, Nov. 30, 1964, pp. 80-81.
Slobod, "Restoring Permeability to Water-Damaged Clays", The Oil and Gas Journal, vol. 68 No. 5, Feb. 2, 1970, pp. 104-108.

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