Reusable potential-prediction of long-term shut-in oil wells

Comprehensive reusable potential prediction models and relevant principles are established in order to reuse the potential of long time shut-in oil wells, which have been shut-in during the high water-cut stage of an oil field, considering economic efficiency and development conditions. The comprehensive reusable potential prediction models include the following: The prediction model of economic potential, based on the economics profit and loss balance principle, which can determine the closing economic limitations of different stages of oil wells and predict whether a long time closed oil well has reusable economic potential or not; the prediction model of redevelopment potential based on Fuzzy Mathematics theory, which provides quantitative evaluation by calculating the redeveloping potential index. Comprehensive reusable potential predictions of 287 long time shut-in wells of P oil field have been done with the models and principles, and 10 wells were selected and put into reproduction in 2006, and good results were achieved with an average daily production of 2.15 t per well and the ratio of annual input to output of 1 to 5.