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Challenges in electronic instrumentation for inductive rock resistivity measurement through well casing

Existing cased wells are being recently reevaluated in order to discover potential oil and gas bypassed during well construction and casing. Bypassing hydrocarbon-bearing layers during the casing of the borehole can later in production result in recovering as low as 20% of estimated original oil in place. Well casings prevent use of traditional open-hole formation evaluation techniques. As a consequence, it is necessary to develop new methods and accompanied electronic instrumentation for reevaluation of the cased wells. Rock resistivity measurement methods are of special interest as a cornerstone of open-hole formation evaluation. Through casing resistivity tools based on contact measurement have been developed and commercialized, whereas the cased-hole application of inductive principle is still in research or early prototyping phase. In this paper we provide an overview of the electrical methods for resistivity measurement in a cased hole and discuss challenges, requirements and limits in electronic instrumentation for inductive resistivity measurement from within a single cased well.

electronic instrumentation; inductive measurements; rock resistivity; cased hole; bypassed oil

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