Defining Oil and Water Entries In Producing Wells In The Permian Basin

As secondary recovery methods become increasingly important in the economic development of oil reservoirs, knowledge of the reservoir fluids behavior becomes essential to attaining optimum performance. Instruments and techniques have been developed that enable identification of the intervals that are contributing oil and/or water under normal producing conditions. Further, the oil and water may be separately and independently identified, both with respect to limits of producing intervals and respective rates of entry. The instruments and techniques are briefly described and examples presented showing results under different completion and producing conditions.