Inherent in all casing programs there exists one area of special concern, and in deep well drilling that usually involves the setting of a long intermediate string of casing. The presence of weak, pressure intolerant lost circulation zones often makes cementing of the intermediate string the most difficult and expensive cementing operation encountered during completion of the well.

The use of an economically attractive and field proven cementing technique has resulted in more predictable results than previously established methods. The application of foam cement at slurry densities equivalent to or less than the drilling fluid weight has resulted in placement of quality cement higher above frail zones than previously possible in a single-stage cementing operation.

Case histories, economic analysis, physical properties and developmental background of foam cementing as applied to deep well drilling will be presented.

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