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After drilling the 8 12-in hole size in the sandstone reservoir with vertical to horizontal permeability ratio of one, a 7-in casing has been run. It is intended to perforate the reservoir and casing with 60 phasing, bullet size of 0.15-in and penetration/perforation length of 12-in. Using the equations and constants for perforation skin effect given, evaluate the final skin factor of the reservoir after perforating the reservoir. After perforating, assume a damaged zone radius is 7.25-in After perforating, assume the radius of crushed zone around perforations is 0.5-in The crushed zone permeability over the intact formation permeability = 0.2 The Damaged zone permeability over the intact formation permeability = 0.5 After drilling the 8 12-in hole size in the sandstone reservoir with vertical to horizontal permeability ratio of one, a 7-in casing has been run. It is intended to perforate the reservoir and casing with 60 phasing, bullet size of 0.15-in and penetration/perforation length of 12-in. Using the equations and constants for perforation skin effect given, evaluate the final skin factor of the reservoir after perforating the reservoir. After perforating, assume a damaged zone radius is 7.25-in After perforating, assume the radius of crushed zone around perforations is 0.5-in The crushed zone permeability over the intact formation permeability = 0.2 The Damaged zone permeability over the intact formation permeability = 0.5

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