| Patent Number |
Title Of Patent |
Date Issued |
| 5704838 |
Down-hole motor universal joint |
January 6, 1998 |
| A universal joint assembly (12) includes a coupling hub member (26) and a female coupling member (24). The female coupling member (24) includes a receptacle (28) at one end for receiving a pivot end (30) of the coupling hub member (26). The joint (12) includes a central bearing structure |
| 5269383 |
Navigable downhole drilling system |
December 14, 1993 |
| A navigable downhole drilling system incorporating a drilling motor having a system of sensors and information processors for determining the depth, inclination, direction and thrust of the drilling motor. Accordingly, the drilling operation can be continuously monitored and adjusted to |
| 5248896 |
Power generation from a multi-lobed drilling motor |
September 28, 1993 |
| A power generation unit associated with a downhole drilling motor capable of producing sufficient rotational speeds to produce power for operating downhole devices associated with the drilling operation. The power generation unit takes advantage of the high speed precessional rotation of |
| 5171138 |
Composite stator construction for downhole drilling motors |
December 15, 1992 |
| A composite stator construction for a downhole drilling motor which provides improved sealing and distortion properties. The elastomer which maintains the sealing/pumping action of the motor is applied in a uniform thickness to a rigid metallic form. In the stator, the rigid former has |
| 5094304 |
Double bend positive positioning directional drilling system |
March 10, 1992 |
| A selectively adjustable double bend positive positioning directional drilling system for kickoff from a main well bore to change the directiion of drilling. The tool is selectively adjustable to facilitate running into the vertical well bore and subsequently to provide an aggressive bui |
| 5040600 |
Geothermal wellhead repair unit |
August 20, 1991 |
| A geothermal wellhead repair unit including a mechanically set packer to isolate the wellhead for removal and repair thereof. The packer is run into the well string using a running tool. The packer is set by placing tension on the mandrel to set the packing elements and the slip assembly |
| 5009265 |
Packer for wellhead repair unit |
April 23, 1991 |
| A geothermal wellhead repair unit including a mechanically set packer to isolate the wellhead for removal and repair thereof. The packer is run into the well string using a running tool. The packer is set by placing tension on the mandrel to set the packing elements and the slip assembly |
| 4984636 |
Geothermal wellhead repair unit |
January 15, 1991 |
| A geothermal wellhead repair unit including a mechanically set packer to isolate the wellhead for removal and repair thereof. The packer is run into the well string using a running tool. The packer is set by placing tension on the mandrel to set the packing elements and the slip assembly |
| 4962819 |
Mud saver valve with replaceable inner sleeve |
October 16, 1990 |
| A mud saver valve for insertion within the drill string to retain mud in the drill pipe and prevent the mud column from flowing past the valve when pumping is interrupted. The valve body has a tubular body and a piston having an axial passage for the flow of drilling mud. This piston is |
| 4955949 |
Mud saver valve with increased flow check valve |
September 11, 1990 |
| A mud saver valve for insertion within the drill string to retain mud in the drill pipe preventing the mud column from flowing past the valve when pumping is interrupted. The mud saver valve includes an internal check valve which permits increased flow of mud upward through the valve whe |
| 4926949 |
Thermal shield for drilling motors |
May 22, 1990 |
| A thermal jacket shield for a drilling motor which permits drilling operations in high temperature wells without failure of the motor. The thermal shield includes a multiple passageway casing to shroud the motor and through which is circulated drilling fluid used to operate the drill |
| 4909320 |
Detonation assembly for explosive wellhead severing system |
March 20, 1990 |
| A detonation assembly for an explosive wellhead severing system which employs a battery pack lowerable through a drill string to engage and power the detonation assembly positioned within the well bore. The lowerable unit includes a biased shutter which seals the contacts from discha |
| 4901806 |
Apparatus for controlled absorption of axial and torsional forces in a well string |
February 20, 1990 |
| A drill string apparatus for the controlled absorption of both axial and torsional forces exhibited on the well string during drilling operations. The device is adapted to be connected in the drill string above the drilling tool in order to control the forces acting on the bit and to |
| 4865137 |
Drilling apparatus and cutter |
September 12, 1989 |
| An underreamer including a body having a bore therethrough, an arm mounted at its upper end to the body, a sleeve member detachably secured to the lower end of each arm and adapted to receive the frictional wear caused by the rotation of the conical cutter mounted thereto. Bearings and s |
| 4793424 |
Self-lubricating well tools and seal elements therefor |
December 27, 1988 |
| A seal element for oil well tools, such as drilling cutters and roller reamers, which allows the drilling media to permeate into the bearing system of the cutter to cool and lubricate the internal mechanism. The seal element is adapted to control the particle size of contaminants flo |
| 4765404 |
Whipstock packer assembly |
August 23, 1988 |
| A packing assembly for a whipstock in which the whipstock can be run into a well casing to a level above the bottom and milling through the casing wall without having to make a round trip with the well string. The packing assembly includes slip-type anchors which initially set the assemb |
| 4759413 |
Method and apparatus for setting an underwater drilling system |
July 26, 1988 |
| A method and apparatus for setting an underwater conductor pipe in which the conductor pipe is lowered into the wellhole on a drill string as the borehole is being formed by a drill bit and underreamer positioned at the end of the drill string below the end of the conductor pipe. The dri |
| 4754820 |
Drilling head with bayonet coupling |
July 5, 1988 |
| A drilling head with an upper body assembly removably clamped onto a stationary spool via a bayonet-type coupler clamp rotated into clamped and unclamped positions by a remote controlled hydraulic motor connected to the clamp by a ring and pinion gear. The upper body assembly has a kelly |
