Model predicts more accurate PI over a field's life

A model, using the vertical lift performance (VLP) for each oil producing well in a UK North Sea oil field, improved the predictions of the productivity index (PI) over the field's life.The new method was developed because the original matched model for predicting the PI worsened over time. Click here to enlarge imageThe instability of the original PI prediction model is seen as a series of peaks and troughs in Fig. 1.A well's PI in stock-tank bbl per day per psi (stb/day/psi) is the total rate at which a well can produce at surface for a given pressure drawdown, assuming that the bottomhole pressure remains greater than the bubblepoint pressure.1 2The study that developed the ne...

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