Abstract: A downhole drilling tool having a tubular stem connected to the drill string, and a tubular housing mounted concentrically and rotatably on the stem, forming an annular space between the housing and the stem. A plurality of bearings within the annular space support the housing against radial and longitudinal thrust loads. A plurality of seals within the annular space above and below the bearings form a lubricant chamber. The housing has a cylindrical lubricant passage extending between the lubricant chamber and the annular space outside of the lubricant chamber. A cylindrical piston is sealably slidable within the lubricant passage and responds to pressure of the drilling fluid entering the passage from the exterior of the housing to force lubricant out of the passage and into the lubricant chamber in order to replace lubricant which is lost therefrom. A downhole drilling motor is attached to the lower end of the housing.

Abstract: An apparatus for making orientation measurements in a drill string within a well bore comprising a tubular housing (22) adapted for insertion into the drill string and first (13) and second (15) measuring devices in the housing for measuring first and second orientation characteristics, respectively, of the drill string. A signal generator (23) is responsive to the two measuring devices to provide a signal which is representative of the orientation characteristics measured. The measuring devices are operated alternately so that the signal from the signal generator is alternately representative of the first and second orientation characteristics. The signal from the signal generator, when the latter is controlled by the first measuring device, is different from the signal when the latter is controlled by the second measuring device so that it is readily apparent which of the two measuring devices is reporting.

Abstract: Apparatus is provided for running, setting and anchoring a liner in a well bore casing, comprising inner and outer bodies with expander and gripping means carried on the bodies to provide means for gripping engagement with casing. A running tool is secured to the bodies and defines drag means thereon to resist longitudinal travel while the apparatus is being mechanically set. A piston element is carried on the running tool and is responsive to fluid pressure entrappable in a piston pressure chamber to hydraulically set the hanger. Mechanical setting means are provided and may be activated to set the hanger upon failure of the hydraulic activation means.

Abstract: An apparatus and method are provided for running, setting and anchoring a liner in a well bore casing, said apparatus being connectable to a tubular member extendible to the top of the well. The apparatus comprises an inner longitudinally extending body with an outer longitudinally extending body being around the inner body. Connection means on one of said inner and outer bodies are provided for connection of a liner extending below the apparatus. Expander means are carried on one of the inner and outer bodies, with gripping means being carried on the other of the inner and outer bodies. The gripping means are engagable with the expander means such that the gripping means are shifted into gripping engagement with the casing. A manipulatable tubular running tool is releasably secured to the inner and outer bodies.