Abstract: A two way hydraulic drilling jar which includes a tubular housing having an interior surface defining an interior bore. A mandrel is provided having an exterior surface. The mandrel is telescopically received within the interior bore of the tubular housing. The exterior surface of the mandrel has an enlarged diameter portion. An annular valve member is provided having a first end, a second end, and an interior surface defining an interior bore. The mandrel extends through the interior bore of the valve member. The valve member is confined with capability of limited axial movement between two shoulders projecting from the interior surface of the housing. The interior bore of the annular valve member receives the enlarged diameter portion of the mandrel in close fitting relation. At least one fluid bypass channel is disposed in one of the valve member and the enlarged diameter portion of the exterior surface of the mandrel.

Abstract: A sealed bearing assembly used in earth drilling is described having a first tubular member and a second tubular member telescopically received in the first tubular member. The second tubular member has an interior passage through which drilling fluids pass under pressure from surface pumps. A clearance space is provided between the first tubular member and the second tubular member defining a lubricant filled sealed chamber. The sealed chamber has a bit end sealed by a bit end seal which faces a drill bit and a pump end sealed by a pump end seal which faces surface pumps. A fixed mechanical seal is disposed in the sealed chamber intermediate the pump end seal and the drill bit end seal. The mechanical seal divides the sealed chamber into a pump end portion and a drill bit end portion. The pump end seal is responsive to pressure exerted by drilling fluids pumped along the interior passage by surface pumps.

Abstract: A flow restrictor for a mud lubricated earth drilling motor consisting of a first seal support non-rotatably coupled to an outer housing and a second seal support non-rotatably coupled to an inner tubular member which is telescopically received within the outer housing. The first seal support having a first seal face and the second seal support having a second seal face. The first seal support and the second seal support are axially movable. A plurality of springs engage the first seal support to exert a biasing force bringing the first seal face into sealing engagement with the second seal face to form a mechanical seal, having a first side adjacent the outer housing and a second side adjacent the inner tubular member. A first fluid flow passage extends from the interior drilling mud flow passage of the inner tubular member the first side of the mechanical seal. A second fluid flow passage extends from the second side of the mechanical seal to exterior of the outer housing.

Abstract: An adjustable bent housing consisting of three tubular members arranged in end to end relation. Each of the tubular members has an interior bore. A first tubular member has a first axis. A second tubular member has a second axis. A central tubular member is centrally disposed between the first tubular member and the second tubular member and has a third axis. An internal tubular member extends into and engages the interior bores of the three tubular members thereby maintaining the tubular members in end to end relation.