(under subclass 256) Subject matter which additionally includes apparatus which includes a detector to sense the location of a pipe collar in a cased well and methods corresponding to the apparatus.
(1) Note. The collar detector need not be a radiation detector but can be any type which senses the position of the pipe collar in a well.
SEE OR SEARCH CLASS
73, Measuring and Testing,
152.57, for a determination of a characteristic of a borehole casing wherein the determination is made by making a measurement which is not purely electrical or purely magnetic.
