Patent ID: 6513223
Filing Date: 2003-02-04
Classification: E21B,Y10T

Abstract:
A method for installing a centralizer collar and outer sleeve on a joint of a drill string casing comprising: providing an adjustable centralizer retaining collar having an outer frustoconical surface, a substantially cylindrical inner surface and a longitudinally extending slit; providing a centralizer outer sleeve, having a tapering, frustoconical inner surface mateable with the outer surface of the retaining collar and an outer surface including bearing surfaces; mounting the retaining collar about the joint of the drill string casing with the retaining collar inner surface adjacent to an outer surface of the casing; heating the outer sleeve to cause material expansion thereof; sliding the outer sleeve over the retaining collar such that their conical surfaces mate and the outer sleeve compresses the retaining collar into close engagement with the joint of the drill string casing.