Cover: Oilfield Review Autumn 2001
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Editorial: Advancing Our Understanding of Permeability
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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.
Oil-base and synthetic-base mud filtrates contaminate openhole reservoirfluid samples, distorting fluid properties measured in a laboratory. These fluid properties influence development and production decisions with significant economic consequences. Now, monitoring hydrocarbon color allows a quantitative measure of contamination, improving the probability of collecting a valid fluid sample. In addition, a new, direct detection of methane downhole makes contamination measurement possible in gascondensate zones.
The controversy surrounding global warming continues without a clear-cut consensus as to its extent or implications. We examine the evidence and the arguments, both pro and con, the advances being made in computer simulation of global climate systems and the proactive steps being taken by oil and gas companies and service suppliers to reduce the impact of oilfield operations on climate change.
With coiled tubing as a conduit for proppant-laden fracturing fluids, single or multiple zones can be stimulated consecutively during a single mobilization. New tools selectively isolate target pay zones without conventional rigs or wireline intervention to set mechanical plugs. Individual zones are treated separately to achieve optimal fracture length and conductivity. Case studies demonstrate the expanding scope and economic benefits of this technique.
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