Abstract

Migration of undesirable fluids through cement channels behind the casing is frequently a cause of well productivity impairment. However, reliable identification of cement channels is difficult and, quite often, secondary cement squeeze jobs fail due to incorrect diagnosis of the existence, nature and extent of the channeling problem. Different techniques such as temperature profiling, radioactive tracer logging and activated water logging have been practiced in the industry, but the results are more often than not inconclusive. Borax logging has been used as an alternative method for detection of cement channels in sandstone reservoirs. The same technique has been applied in the limestone formation of the Panna Field located Bombay Offshore, India. The logging results are less definitive than for typical sandstone applications. However, with a proper understanding of the geological model, this detection technique can be effectively utilized as a cement channel identification tool.

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