Measuring formation resistivity behind metal casing allows us to apply well-established water saturation evaluation methods to a producing reservoir. This new technology can find widespread applications, especially in low porosity settings where pulsed neutron readings are problematic. However, building a device capable of measuring formation resistivity through metal casing constitutes several major technical and scientific challenges. In cooperation with a consortium of oil companies led by Gas Research Institute (GRI), Baker Atlas has developed a Through Casing Resistivity Tool. The instrument has completed several successful tests under field conditions. The recordings of through casing formation resistivity track the open hole logs very closely. Casing imperfections and collars are successfully compensated.

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