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Title: New Casing Inspection Log
Author: J. F. Cuthbert, W. m. Johnson, Jr.
Source: American Gas Association 1975
Year Published: 1975
Abstract: A new casing-inspection log, in combination with other logs, provides for detailed evaluation of in-place well casing. The new Pipe Analysis Log employs separate tests of the total casing wall and of the inner surface. Together, these two measurements permit detection, with a high degree of resolution, of small defects and corroded areas in the pipe, and also provide the ability to discriminate between defects on the inner and outer walls of a single string of casing. This was not possible with just the wallthickness information provided by the older low-frequency Electromagnetic Thickness Tool. Using the data from the new log along with the older wall-thickness measurement it is also possible to detect and locate severe corrosion or defects in the outer casing of a double string.

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