Abstract: A rod extractor for ground drill rods having a drill rod (20) with a plurality of rod threads (23) at its upper portion, about which an extraction collar (30) with internal threads rotates slidably with said rod threads. A guide sleeve (51) having a sleeve opening is attached perpendicular to a ground plate (50) which rests on a ground surface. Said rod travels through said sleeve opening into the ground, upon which an extraction tool (40) rotates said collar about said rod resulting in downward travel of said collar in relation to said rod and sleeve until said collar contacts said sleeve. Further rotation of said collar results in upward force upon said rod, extracting it from the ground.

Abstract: A technique for providing auxiliary conduits in multi-trip completions is disclosed. The technique has particular applicability to liner mounted screens which are to be gravel packed. In the preferred embodiment, a protective shroud is run with the gravel pack screens with the auxiliary conduits disposed in between. The auxiliary conduits terminate in a quick connection at a liner top packer. The gravel packing equipment can optionally be secured in a flow relationship to the auxiliary conduits so as to control the gravel packing operation. Subsequent to the removal of the specialized equipment, the production tubing can be run with an auxiliary conduit or conduits for connection down hole to the auxiliary conduits coming from the liner top packer for a sealing connection. Thereafter, during production various data on the well can be obtained in real time despite the multiple trips necessary to accomplish completion.

Abstract: A drilling rig is provided which is adapted to selectively drill using coiled tubing and jointed-pipe. The rig includes a base, a mast, a top drive slidably mounted to said mast for performing jointed-pipe operations, and a tubing injector for performing coiled tubing operations, mounted on said mast for selective movement from a first position in which the injector is in line with the mast and a second position in which the injector is out of line with the mast to permit jointed-pipe operations by the top drive. The rig is uniquely suited to easily and quickly assemble bottom hole assemblies (BHA's), and to connect such BHA's to coiled tubing.

Abstract: The apparatus is connected to a member on the elevator that moves if and when the slips move between the open and closed positions. The member is locked in a preselected position that attends the position of the slips when the elevator is considered safe. When the member is in that safe position a wireless signal is generated by the apparatus part on the elevator and received by a receiving part of the apparatus in a convenient remote location such as the drillers position. In response to the received signal, the receiving part produces a visible signal to indicate that the slips are in the preselected position.

Abstract: The horizontal spool tree assembly 10 controls fluid flow through a production tubing string 18 within a well. The horizontal spool tree assembly is adapted for use with a workover string for fluid communication with the tree assembly. The spool body 12 has a central bore 14 for receiving a tubing hanger 22 therein, with a production passageway extending laterally through the spool body to a production line 36. The spool body also includes an annulus passageway extending laterally through the spool body for fluid communication between the tubing annulus 16 and the annulus line 52. The spool tree assembly has improved porting for the production line and the annulus line, and also for both workover and crossover operations.

Abstract: A shaft assembly having an inner shaft extending lengthwise within an outer shaft, and a slip joint enabling relative axial movement between the shafts. The slip joint includes roller tracks on the outer shaft, and rollers on the inner shaft in rolling engagement with the roller tracks.

Abstract: A method is disclosed for applying hardfacing to a shirttail portion of a roller cone drill bit, including masking around the shirttail portion of the bit and operating a high pressure/high velocity oxygen fuel torch to apply the hardfacing to the shirttail portion.

Abstract: Methods of cementing subterranean zones using cement compositions containing biogradable dispersants are provided. The methods are basically comprised of the steps of preparing a hydraulic cement, a biodegradable dispersant comprised of polyaspartic acid containing side chains formed by reacting one or more side chain chemicals with said polyaspartic acid and sufficient water to form a pumpable slurry, placing the cement composition into a zone to be cemented and allowing the cement composition to set into an impermeable solid mass therein.

Abstract: An indexing mechanism is disclosed that can put a tool in a variety of positions while downhole in the face of high static and dynamic loads. In the preferred application, the mechanism controls a movable sleeve on a downhole choke. It contains an indexing feature comprising a pin movable in a series of slots. A piston restrained to move longitudinally engages and rotates an index sleeve to allow the pin to advance into the next J-slot track. A separate lug on the piston engages a radial face on the index sleeve to take the shock load and position the choke instead of allowing the pin to load against the closed end of the slot.

Abstract: A support system for supporting a frac blender or other heavy load on a transport vehicle includes a support frame having vertically extending slides for a lift platform whereby the load may be moved between a stowed position and an operating position along a vertical, linear path within the limits of the support frame.

Abstract: The invention relates to the assembly of a drive shaft with the cutting head hub of a submersible granulator. Said assembly comprises a connector hood which can be fixed to the drive shaft in such a way that it remains free to move. The connector hood is provided with threading for screwing the cutting head hub onto the drive shaft, said drive shaft being supported on a spherical extremity situated on the inside of the connector hood, and a cogged crown with inner-sided cogs is placed on the cutting head side of the drive shaft. The connector hood has inner-sided cogs which interlace with the cogs on the outer side of the cogged crown. The outer surface of each cog on the cogged crown is convex.

Abstract: The stabilizer (1) has a tubular central body (3) having means for connection (3a, 3b) to a first and a second component of the string of drill rods and at least one external contact element (4) with a wall (2a) of the borehole (2). The external element (4) for contact of the stabilizer (1) with the wall (2a) of the borehole (2) has at least one means for activation (6) of a means (7) co-operating with the wall (2a) of the borehole (2) to limit the friction between the contact element (4) and the wall (2a) of the borehole (2). The activation means can consist of inter-blade spaces (6) for acceleration of the circulation (7) of the drilling liquid or by a means for coupling in rotation of the external element (4) and the central body (3) of the stabilizer (1).

Abstract: A system and method for developing and recycling drilling fluids at the site of a subterranean well is described, thus eliminating the need for transporting the fluids to the site.

Abstract: A replaceable pressure sensor insert adapted for removable connection with an insert carrier. The pressure sensor insert is comprised of a housing defining an exterior and an interior of the housing, a pressure sensor connected with the housing such that the pressure sensor is capable of sensing an ambient pressure at the exterior of the housing and an electronics assembly contained within the interior of the housing and electrically connected with the pressure sensor. In addition, the insert is comprised of a first insert mounting component adapted to be removably connectable with a second insert mounting component associated with the insert carrier in order to facilitate connection and replacement of the insert. Finally, a housing sealing mechanism is provided for sealing the insert relative to the insert carrier and a sensor sealing mechanism is provided for sealing the pressure sensor relative to the housing.

Abstract: A raise boring head includes a roller cutter body and a saddle intended for rotary drilling in earth and rock formations. The roller cutter body is rotatably journalled on a shaft that is provided with two shaft spigots at its opposite ends. Each spigot has a second support surface provided for cooperation with a first support surface of the saddle to hold the roller cutter to the saddle. Each shaft spigot is provided with a hole for receiving a fastener that also passes through the second support surface in order to connect the shaft spigot to the saddle. The first support surface and the second support surface are curved. The first support surface and the second support surface connect directly or indirectly to stop shoulders for counteracting rotation of the shaft. The fastener is eccentric to the shaft axis and arranged to press the stop surfaces together.

Abstract: Devices and methods for incorporating a gap sub assembly into a drill string to electrically isolate portions of a transmitter assembly within, for example, an MWD tool located within the drill string. The gap sub assembly incorporates upper and lower subs having an insulated interconnection. A central conductor assembly is axially disposed within the lower sub and does not extend through the length of the gap sub. The central conductor assembly is used to transmit electrical power and data across the gap sub assembly between the upper portions of the drill string and transmitter components housed within the MWD tool disposed below the gap sub assembly.

Abstract: A torque fluctuation absorber which is unlikely applied with an foreign material such as dust on a limiter portion during transporting the torque fluctuation absorber. The torque fluctuation absorber includes a flywheel for transmitting a driving force from a power source and a damper mechanism having a limiter portion which includes a frictional member being frictionally engaged with the flywheel on an external peripheral side and connected to an input shaft of a transmission on an internal peripheral side. The torque fluctuation absorber further includes a supporting mechanism for performing a frictional engagement of the frictional member by supporting the frictional member in an axial direction of a drive shaft under a condition before assembling the flywheel to the damper mechanism.

Abstract: The present invention provides a liner hanger and a method of hanging a liner in a wellbore. In one aspect, a process for setting a liner in a wellbore is provided in which a tubular having a slip formed on an outer diameter of the tubular at a first location and a preformed bypass for circulating a fluid disposed at a second location is set and expanded into substantial contact with an inner diameter of the wellbore, a casing, or another liner. In another aspect, a process for setting a liner in a wellbore is provided in which a tubular having a slip formed on an outer diameter of the tubular at a first location is placed in the wellbore, a bypass for circulating a fluid is formed downhole, the liner is set and expanded into substantial contact with an inner diameter of the wellbore, a casing, or another liner.

Abstract: An axial plunging unit for torque transmission within a driveline which includes a profiled journal (11) with first circumferentially distributed longitudinally extending ball grooves (12), a profiled sleeve (13) with second circumferentially distributed longitudinally extending ball grooves (14), balls (15) which are arranged in pairs of first and second ball grooves (12,14) in identical groups, and a supporting and attaching sleeve (21) which is slid on to the profiled sleeve (13) so as to ensure the transmission of torque.

Abstract: It is made easy to design so that the sliding resistance, when subjected to an impact in the axial direction, is kept within a prescribed value. A constant velocity universal joint is provided, which has track grooves extending in the axial direction on the outer circumference surface of the inner ring, and formed in an intersecting arrangement, and which also embeds balls in these track grooves. In this constant velocity universal joint, the cross-sectional shape of the track groove of the inner ring is constituted by a Gothic arch portion which is a Gothic arch shape up to a location that exceeds a contact point where the groove angular contacts with the ball, and a straight-line portion which is formed continuously with the Gothic arch portion, between the location exceeding the contact point and a shoulder portion of the track groove, and which extends in the direction of the tangent line at the location that exceeds the contact point.