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The phenomenon of reservoir permeability reduction (including absolute permeability and relative permeability) due to drilling, completion and other downhole operations is referred to as formation damage. Formation damage is very common during these operations. According to a survey conducted in the late 1980’s, the reservoirs in about 30％ of the wildcat wells were damaged seriously or to an intermediate extent during drilling and completion, indicated by drill stem tests and well completion tests. Therefore, reservoir protection becomes
The phenomenon of reservoir permeability reduction (including absolute permeability and relative permeability) due to drilling, completion and other downhole operations is referred to as formation damage. According to a survey conducted in the late 1980’s, the Reservoirs in about 30% of the wildcat wells were damaged seriously or to an intermediate extent during drilling and completion, indicated by drill stem tests and well completion tests. Therefore, reservoir protection becomes