Brine corrosion inhibitors, varying from highly dispersed organic materials to low-molecular-weight salts, were evaluated for their effect on return oil permeabilities.

Cores used in these tests were 50-to 100-md and 1,0-to 3,000-md sandstone. Temperatures up to 300°F and two different density brines were studied. Results show that emulsion blockage was a problem at low temperatures for inhibitors that yielded low brine/oil interfacial surface tensions. At higher temperatures, emulsion blockage was greatly reduced.

Inhibitors that produce sulfide ions resulted in reduced return permeability with cores containing iron(III).

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