Abstract

Several empirical relationships to derive permeability values from logs have been proposed over the years. These relationships have been refined to the point where they give good results in many formations.

The performance of wells completed in the multiple sands of the Talang Akar formation in IIAPCO'S Zelda field is shown to fit with predictions based on the log permeability calculations. The evaluation includes both initial completions and workovers.

The productivity of several wells is shown to be related to log-derived transmissibility. Relative permeability calculations provide a watercut prediction that is shown to fit with the well performance.

DST results from other wells in the area are also examinied and are shown to fit with the log-calculated transmissibilities and watercuts.

Being able to predict the productivity potential and watercut, zone by zone, has resulted in adoption of different criteria in choosing perforation intervals. The Zelda area, in particular, is plagued by water entries at all levels. By avoiding potentially water-productive zones and concentrating on high transmissibility zones, more efficient well completions and workovers can be made.