Through-tubing hostile-environment acoustic logging tool for cased holes ///

The drilling environment encountered in modern wells, especially gas wells, frequently includes higher temperatures, higher pressures and smaller diameters than standard wells. Further, specialized borehole fluids or air may be used to preserve borehole and formation integrity. These conditions frequently limit or even preclude use of conventional acoustic logging tools. High rig costs may also result in the elimination of all, or part of the traditional openhole logging program. Described here is the development of a new, slim acoustic logging tool for cased-hole cement-bond evaluation and more complete formation evaluation. Two case histories demonstrate the new tool's versatility.

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