The EM Pipe Scanner electromagnetic casing inspection tool combines a slim mandrel with 18 pad sensors to quantitatively scan the interior surface and thickness of production casing. The slim mandrel enables measuring casing corrosion and identifying grooves and splits without having to first pull the completion tubing, saving significant time and cost.
During its initial descent in the well, the EM Pipe Scanner tool conducts a high-speed reconnaissance run to flag places of interest for subsequent diagnostic scans as the tool ascends. The low-frequency downpass for casing inspection produces a thickness image for evaluating the remaining metal. The diagnostic images from the high-frequency upward pass identify the exact severity and nature of the corrosion. The high-frequency discrimination image provides the status of the internal casing wall and acts as a discriminator for defects in the inner or outer wall of single casing strings.
The versatile EM Pipe Scanner tool is fluid insensitive, operating in liquid or gas environments, and can be deployed by wireline, tractor, or coiled tubing at up to 90° well deviation. Time-lapse deployment provides corrosion rate estimates, identifies casing corrosion behind tubing, and determines the inner tubular radius behind scale.