This study focuses on methods to reduce the permeability of water bearing formations by injecting chemical solutions through the wellbore. Permeability reduction applies in increasing recovery from waterfloods, water-drive gas reservoirs, and might find application in other fields, like environmental engineering, hydrogeology and construction. Different permeability reduction mechanisms are investigated and recommendations are given to aid in selecting an appropriate permeability reduction mechanism for a given reservoir. The study is conducted through literature search, theoretical and experimental investigations(1).

After examining several permeability reduction methods, it was found that no single technique can be applied universally in all reservoirs. The most common factor affecting the success and applicability of all the methods mentioned above is temperature, fluid salinity and pH. Some met 11ods also depend on shear rate and consequently to rock properties as well as flow rate. The result of this study is a table that according to reservoir temperature, fluid salinity and pH, suggests the most efficient method to reduce permeability in a water bearing formation. Although this table does not provide a final answer to all possible situations, it is a starting point to design the appropriate permeability reduction treatment for a particular formation.

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