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Porous media permeability profile modification was studied using biomass and bacterially formed CaCO 3 as plugging agents. The candidate bacterium, an isolate from a Canadian oil field, was able to decompose urea at concentrations as high as 20g/L. Bacterial production of CaCO 3 was achieved in the cultures containing 5, 10 and 15g/L of urea and equimolar concentrations of CaCl ...
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