INFLOW PERFORMANCE AND TRANSIENT PRESSURE BEHAVIOR OF SELECTIVELY COMPLETED VERTICAL WELLS

This Paper presents new methods to estimate the inflow performance and transient pressure behavior of selectively completed vertical wells. In the first part, inflow performance of wells perforated at several i ntervals along the producing formation is investigated. It is observed that formation anisotropy, total perforated length/formation thicknes s ratio, and mechanical skin distribution caused by formation damage a re the parameters controlling the well productivity. In the second par t, transient pressure and pressure-derivative response of selectively perforated wells are modeled and examined. A new interpretation techni que, which combines the conventional semilog straightline analysis and type-curve matching method, is presented to determine reservoir param eters.