A new multiple depth of investigation resistivity device has been developed for use in slimhole drilling applications. The tool has a 4-3/4 inch nominal diameter and also contains gamma ray and vibration sensors.

The tool has been designed to work in medium radius horizontal wells. It can be run stand-alone or in conjunction with existing 4-3/4 inch MWD (Measurements-While-Drilling) directional tools. The data are stored in the tool’s downhole memory and are transmitted to the surface real-time.

This paper describes the requirements and design process used to develop this slimhole resistivity device and discusses its testing and field results.

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