Abstract
Several commonly occurring water quality issues, and their impact on injectivity were discussed. Among the issues examined were damage due to injection of suspended solids, fines migration, clay swelling and deflocculation, formation dissolution, chemical adsorption and wettability alterations, relative permeability effects associated with the injection of skim oil or grease, and the injection of entrained free gas. Damage induced by bacteria, by the formation of insoluble scales, emulsification, wax and asphaltene deposition were also included in the discussion. Screening criteria for evaluating the particular injection water source for the purpose of investigating potential areas of sensitivity and to minimize problems resulting from impaired injectivity, are proposed. 50 refs., 5 tabs., 6 figs.
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