Determination of flow efficiency and skin
To quantify formation damage and understand its impact on hydrocarbon production, one must have reasonable estimates of the flow efficiency or skin factor. Several methods have been proposed to evaluate these quantities for oil and gas wells. Multirate tests can be conducted on both oil and gas wells. In these tests, several stabilized flow rates,qi, are achieved at corresponding stabilized flowing bottomhole pressures,pwf. The simplest analysis considers two different stabilized rates and pressures.
June, 2015