Patent ID: 6343648
Filing Date: 2002-02-05
Classification: E21B

Abstract:
A down-hole tool, comprising:a generally tubular body member; and one or more detachable pads mounted on the tubular body member so that they are radially movable, the one or more pads each being retained to the body member by a retaining means provided as one or more longitudinal mechanical fasteners disposed in a generally radial orientation and positioned so as to correspond with and pass through respective apertures provided in the pads, wherein the one or more mechanical fasteners each engage the body member and limit the radial movement of the pad away from the body member; and biasing means for biasing the or each pad in an outward radial direction, wherein the biasing means comprise springs held under compression when the down-hole tool is in use, the springs are coil springs, and some or all of the springs may be located over the mechanical fasteners.