A downhole tool with at least one extendable offset cutting member for reaming a bore

摘要

The downhole cutter tool 40 comprises an elongate tubular body 42 formed with windows 44 which accommodate extendable cutters 46. The cutters comprise a longer portion 51 and a second shorter portion. The cutters 46 are mounted offset in the body 42 and are extended by means of interaction with cam members 48 arranged about a central member 50 with a throughbore 52. The cutters are mounted such that a projection of the central axis of extension 49 is offset from a radius 61 of the devise 40.