The processes that occur during the well drilling and completion have significant and often irreversible effects on the properties of near-wellbore zone. Sensitivity study of the characteristics of mud invasion, well cleanup and production processes is carried out to the properties of reservoir, external and internal mud cake and perforation length. Sensitivity of dynamics of external mud cake buildup to the rate of mud circulation in wellbore is also analyzed. The characteristics of mud invasion significantly depend on the reservoir mobility, solids concentration and circulation.
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