Technique forecasts production from waterflooded reservoirs

A proposed technique using the observed trend of log water-oil ratio (WOR) vs. cumulative oil produced (Np) can predict oil well decline rates on a time basis.An oil reservoir in the mature stages of waterflooding has historical well data, acquired during production, well tests, and cased-hole logging. These mature assets require a simple and accurate but fast analytical method for predicting future production performance. Conventional forecasts with exponential decline curves tend to be conservative when predicting future oil rates because they do not explicitly consider the water cut.Also in the latter stage of a field's life, reservoir simulation may help identify by-passed oil pot...

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