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ABSTRACT
The use of horizontal wells is gaining widespread frequency throughout the world. Production results from many horizontal wells have been disappointing, and it is believed that when this has occurred in situations where viable reservoir 11 quality has been present, near wellbore formation damage effects have been a major contributor to the marginal flow performance. Because most horizontal wells are completed in an open-hole fashion, even relatively shallow invasive near-wellbore damage (that would be penetrated by conventional perforation practices in cased and cemented vertical completions) may substantially impede flow. Calculations illustrate how loss in the production rate of horizontal wells due to near wellbore formation damage using average horizontal permeability, average vertical permeability, and damage zone permeability. The results are the relationship between the ratio of flowrate of damaged horizontal wells to flowrate of undamaged horizontal wells and damaged zone thickness with constant damaged zone permeability
