Metal rollers for use with cables, rods and strings in the oil and gas well industry; metal rollers for use with cables, rods and strings on a downhole apparatus for reducing friction in an oil or gas well

Motorized or mechanized well intervention tools having friction reducing devices for the purpose of lowering and raising items in and out of wells, namely, downhole conveyors comprising a metal body having at least one roller, the roller being motorized or mechanized to impart a driving force and reduce friction; motorized or mechanized well intervention roller tools for lowering and raising items in and out of wells, namely, downhole conveyors comprising a metal body having at least one roller, the roller being motorized or mechanized to impart a driving force; motorized or mechanized well intervention tools having wheels, rollers, tracks or runners for reducing friction of a string during the lowering and raising of items in and out of an oil or gas well, namely, downhole conveyors comprising a metal body having at least one wheel, roller, track or runner, the wheel, roller, track or runner being motorized or mechanized to reduce friction; parts and fittings for the aforesaid goods, namely, non-metal rollers and roller subs for the aforementioned downhole tubes, tubular jars, namely, downhole tubular tools that can release stored compressive or tensile energy so as to generate a shock, linear bearings for machines; motorized or mechanized wireline subs, namely, well intervention sub-assemblies for use with wirelines; maintenance kits and redress kits for the foregoing, namely, kits comprising sealing joints, bearings, wheels, rollers, runners and motors, sold as a unit