Abstract: A well tool carried in a drill string for maintaining bottom hole contact while absorbing angular and axial shock forces of a rotating drill bit. The tool has an elongated body with pipe joint ends and includes a tubular mandrel slideably mounted within a tubular barrel. A groove and roller connection guides the mandrel within the barrel during drilling. Resilient shock absorbing members between metal guide rings are carried between stop elements on the mandrel and barrel. Shock forces are absorbed by the telescoping movements of the mandrel within the barrel and by in the members acted on by the stop elements. The mandrel is formed of two pieces that threadedly connect to one another between the resilient shock absorbing members and the groove and roller connection. A lifting lug positioned above the rollers and below the shock absorbing members within an elongate mandrel groove, engages the joint to transfer the weight of the mandrel to the barrel upon withdrawal of the tool.

Abstract: A machine for boring a shaft in earth strata or the like. An annular support ring means having an outside diameter approximately equal to the diameter of the shaft which is selectively engageable or disengageable with the shaft wall by the use of clamping means is disclosed. A carriage means which is slidably mounted on the annular support ring means and orbital thereabout is also disclosed. A rotary cutting wheel means having a diameter substantially smaller than the diameter of the shaft is mounted on the carriage means and is axially displaceable with respect thereto for movement in a direction which may be parallel or inclined with respect to the axis of the shaft. Various drive means for moving the carriage means circumferentially about the annular support ring means, and for moving the rotary cutting wheel means in an axial direction with respect to the carriage means, and for rotating the rotary cutting wheel means are described.

Abstract: In a drill bit comprising a body having a channel therethrough for carrying drilling fluid for injection into a bore hole through a nozzle at one end thereof and a cutting head mounted in the body and contacting the bottom of the bore hole. The improvement comprises at least one passage extending from the channel to a side portion of the exterior surface of the body wherein drilling fluid in the channel will flow through the at least one passage to the exterior of the body and form a fluid layer between the side portion of the body and the opposing side of the bore hole.

Abstract: A well tool carried in a drill string for maintaining bottom hole contact while absorbing angular and axial shock forces of a rotating drill bit. The tool has an elongated body with pipe joint ends and includes a tubular mandrel rotationally and slideably mounted within a tubular barrel. A groove (preferably helical) and roller connection guides the mandrel from the barrel during drilling. Resilient shock absorbing members between metal guide rings are carried between stop elements on the mandrel and barrel. Shock forces are absorbed initially by the rotating/telescoping movements of the mandrel within the barrel. Excess shock forces are absorbed in the members acted on by the stop elements on further inward/outward movements of the mandrel rotating in the barrel. Unique cross-over rings (graphite-filled Teflon.RTM.) cushion the resilient members from impacts of the metal guide rings.

Abstract: The disclosure relates to an improved apparatus for effecting the cementing of a liner at the bottom of a well bore. The liner sleeve assembly is inserted into the well bore on a hanger which is detachably connected to a running tool, which, in turn is connected to the work string by a torque transmitting expansion joint. The running tool may be fluid pressure actuated to set the hanger. In the event of failure of the fluid pressure setting operation, the hanger may be mechanically set by rotation of the work string transmitted to the running tool by the torque transmitting expansion joint.

Abstract: This device, positioned above the drill bit, comprises a body provided with an axial bore communicating with the drill string and distribution means, controlling the direction of flow of the flushing fluid, slidably mounted in said bore and having two positions. This distribution means can be shifted from a first to a second position and vice-versa by a succession of fluid supply periods separated by periods of interruption of the fluid supply.

Abstract: An apparatus for extracting subterranean gas samples including an elongated stiff rod having a gas passageway from near the bottom end to near the top end, a means for driving the rod into the earth whereby the lower end is positioned below the earth's surface, a means to selectably open and close the gas passageway so that the passageway may be closed until the rod lower end is driven beneath the earth's surface after which the passageway may be opened, and means adjacent the upper end of the rod for extracting a gas sample from the passageway.

Abstract: A drill string in a well bore has a mandrel extending longitudinally thereof adjacent the lower end of the drill string with a drill bit connected to the mandrel. Longitudinally extending helical groove means are provided in the mandrel and roller means are supported on the drill string and engaged with the helical groove means. Spring means is supported by the drill string and abuts the mandrel to tend to urge the mandrel longitudinally out of the drill string whereby the bit is urged into substantially continuous contact with the well bore bottom as the drill string is rotated during drilling operations. Valve means are provided for selectively circulating fluids from the drill string to the well bore above the drill bit, and when desired jar means may be incorporated in the drill string to impart an up or down jar thereto should the drill string become stuck or tend to become stuck during drilling operations.

Abstract: A drill string in a well bore has a mandrel extending longitudinally thereof adjacent the lower end of the drill string with a drill bit connected to the mandrel. Longitudinally extending helical groove means are provided in the mandrel and roller means are supported on the drill string and engaged with the helical groove means. Spring means is supported by the drill string and abuts the mandrel to tend to urge the mandrel longitudinally out of the drill string whereby the bit is urged into substantially continuous contact with the well bore bottom as the drill string is rotated during drilling operations. Valve means are provided for selectively circulating fluids from the drill string to the well bore above the drill bit, and when desired jar means may be incorporated in the drill string to impart an up or down jar thereto should the drill string become stuck or tend to become stuck during drilling operations.

Abstract: In apparatus for drilling a hole in the ground comprising tubing for shoring up the walls of the drilled hole and a drilling member comprising a pneumatic percussion hammer having an eccentric cutting edge, the drilling member extending in the tubing and having a working position in which the cutting edge extends below the lower end of the tubing and a removal position in which the cutting edge is within the tubing, the extension tube for supplying gas to the hammer is connected to the hammer by a helicoidal telescopic connection which is rotatable through 180.degree.

Abstract: An underreamer includes a mounting member and a plurality of cutter arms. Means pivotally mounts the cutter arms on the mounting member. Overridable means is operable for holding the cutter arms relatively outward in an underreaming position. The overriding means is operable to allow the cutter arms to move relatively inward upon forces on the cutter arms above a predetermined level.

Abstract: A fixed blade assembly rigidly mounted adjacent the oppositely disposed ends of a 7 feet 4 inches of drill pipe with a spinner assembly mounted for rotation and linear movement therebetween. The spinner assembly, randomly rotating and assisting the fixed blade assemblies to center a drill stem in a vertical hole, is stopped by intersecting the side of a drill hole when the drill string starts to deviate from the vertical, and acts as a prize against the side of the drill hole to pry the lower end of the drill string back to vertical and return to random rotation. A jaw-lock assembly is provided between the spinner assembly and the lower fixed blade assembly for wash-over operation should the drill, tool or drill stem stick.

Abstract: A housing with a mandrel therein is adapted to be connected in a rotary drill string. The housing and mandrel are constructed and arranged to support the work load of the rotary drill string as well as dissipate both longitudinal and radial impact or shock loads that the drill string may encounter. The construction also includes means whereby radial impacts applied to the drilling assembly are connected or translated into longitudinal components of force so that various combinations of longitudinal and/or radial impact or shock loading of the drill string may be dissipated in a manner to inhibit damage to the drill string and its components.