Importance

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Abstract

A portable system for reworking the inside diameter of oil field pipe and casing, and especially plastic coated pipe that is to be re-coated. The system includes a grinderhead that removes irregularities from the inner surface of the pipe to render the pipe suitable for use in deep wells. A cutterhead assembly is rotated as it is forced into the interior of a joint of pipe. The cutterhead assembly includes a mandrel which turns a special cutting device having a plurality of grinders for engaging and cutting the inner wall of the pipe as the entire grinderhead is forced to travel through the pipe. Alignment and grinding members attached to the mandrel maintain the longitudinal axis of the grinders in proper alignment to produce the desired new pipe inside diameter. Included in the system is a special cutterhead for removing old plastic coating material in advance of the grinderhead whereby the cutterhead mostly removes plastic while the grinderhead mostly removes metal from the inner pipe surface.

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First Claim