Sonde

摘要

A sonde deploys a sensor against a well casing. The sonde has an expandable and/or resilient C-shaped member and at least one sensor. The C-shaped member has an annular configuration with a single gap that defines two ends facing each other. The member is compressible, and once compressed, its ends close together. A device releasably compresses the C-shaped member so as to allow positioning of the sonde inside the well and subsequent deployment.