Characterizing Permeability with Formation Testers 

Oilfield Review Autumn 2001
Publication: Oilfield Review
Volume: 13
Issue: 3
Publication Date: 10/01/2001

Permeability controls reservoir performance but is difficult to determine, often changing dramatically with scale and direction. Modern wireline formation testers, equipped with packers and multiple probes, provide cost-effective permeability data not reliably available with other techniques. Case studies show how wireline-tester data, interpreted with new models, can now quantify the effects of small but crucial baffles and super-permeability streaks, as well as determine vertical and horizontal permeability at a length scale between those of cores and drillstem tests.