Rick BehennaHalliburton Energy ServicesDuncan, Okla. Laboratory tests on sandstone cores show that organic clay stabilizers (OCS) are as effective at preventing permeability reduction from freshwater exposure as commonly used potassium chloride (KCI). Although organic clay stabilizers are widely used, only limited laboratory testing has confirmed their effectiveness at preventing permeability reduction attributable to a formation's water sensitivity. Existing test results on one class of OCS indicated satisfactory performance as a KCI replacement; however, the test procedure included only short cores and the simulated brine used for testing was sodium ch...

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