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A screening of enzymes as filtercake breakers was performed on several commercially available enzymes. Two enzymes, a thermostable amylase from Bacillus licheniformis and a cellulase from Trichoderma reesei, were found to be effective on the basis of activity tests in the presence of the most common biopolymers used in drill-in fluids such as starches and scleroglucan. Whereas the amylase can hydrolyze...