EM casing inspection

February 1, 2010

Schlumberger’s newly released electromagnetic EM Pipe Scanner casing inspection tool combines a slim mandrel with 18 pad sensors that can run through tubing to produce a quantitative scan of the interior surface and thickness of production casing. The tool can also be used to locate generalised tubing corrosion, grooves and splits.

The tool makes a highspeed reconnaissance run as it descends into the well, identifying places of interest followed by diagnostic scans as it ascends to produce images that determine the severity and nature of the corrosion.

In time-lapse mode, the EM Pipe Scanner is designed to provide corrosion rate estimates, find casing corrosion behind tubing and determine inner tubular radius behind scale.

The slim 21/8in diameter tool can easily pass below the tubing shoe to quantify metal loss in percentage and average inner diameter (ID) of casing ranging from 27/8in to 95/8in OD. In double casing strings, a continuous log of average casing ID and total metal thickness is recorded.

Schlumberger reports it has successfully completed more than 100 jobs in 11 countries, deploying the fluid insensitive scanner by wireline, tractor and coiled tubing in well deviations up to 90°.



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