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| Number | Title | Issue Date |
| 7409758 | Vibration damper systems for drilling with casing Apparatus and methods are provided for reducing drilling vibration during drilling with casing. In one embodiment, an apparatus for reducing vibration of a rotating casing includes a tubular body disposed concentrically around the casing, wherein tubular body is mov... | 08/12/2008 |
| 7284603 | Expandable completion system and method A well completion having an expandable tubular. The expandable tubular having a tubular base and a conforming layer. The conforming layer being radially expandable singularly or in combination with expansion of the tubular base. The expandable tubular being perforat... | 10/23/2007 |
| 7234544 | Drill tool shaft-to-housing locking device In a tool having an inner member supported within an outer member, wherein the tool defines a longitudinal axis, a device is provided for preventing relative rotation of the inner member and the outer member. The device is comprised of a locking mechanism and a lock... | 06/26/2007 |
| 7134455 | Insulator apparatus for vacuum insulated tubing An insulating apparatus for use with vacuum insulated tubing sting to reduce heat loss through the joints, where the apparatus includes an insulator adapted to surround the joint and a latching joint protector adapted to surround the insulator and hold the insulator... | 11/14/2006 |
| 7048064 | Multi-unit centralizer A multi-unit centralizer for centralizing or otherwise positioning a tubing string in a well bore. The centralizer has a centralizer hub including multiple hub subunits for removably engaging each other and at least one spacer lug for removably engaging each of the ... | 05/23/2006 |
| 7025136 | Torque reduction tool A tool for reducing torque on work string, eg for gas or oil production, comprises an upper clamp (2), a lower clamp (3) and connection means (4), the three components formed as a unitary structure (1). The tool also comprises bearing mea... | 04/11/2006 |
| 6997254 | Method of making a centering device and centering device formed by that method A spring centralizer device for supporting a tubular member spaced from the wall of a bore is made from a single piece of boron steel material. The spring centralizer device has first and second collars spaced apart along a longitudinal axis. Spring bow portions ext... | 02/14/2006 |
| 6910534 | Apparatus for attaching a sensor to a tubing string A method and apparatus, for deploying a sensor attached to tubing in a highly deviated or horizontal wellbore, that are characterized by a stationary attachment system that securely fixes a sensor to a tubing string such that the sensor is coupled to the casing rega... | 06/28/2005 |
| 6494274 | Axle, a friction reducing fitting and an axle installation method A friction reducing fitting for downhole applications. The fitting has a body portion (3) for securement about a tubular member, the body portion having a pair of apertures (5, 6). A roller (1) is provided, and an axle (4, 11) passing through said roller ... | 12/17/2002 |
| 5833019 | Pipe protector A casing/drillpipe protector is disclosed that has a composite structure made up of two separate parts. Both parts have cages to secure skeleton functions. The inner part is nested within the outer part such that the open ends of both cages form loops whi... | 11/10/1998 |
| 5692563 | Tubing friction reducer A tubing friction reducer is mounted on a length of tubing within a bore hole. The friction reducer includes a cylindrical body having a first section and a second section hingedly secured around an exterior surface of the coiled tubing, the cylindrical b... | 12/02/1997 |
| 5579854 | Drill pipe casing protector and method A drill pipe casing protector has an inner hub member releasably secured to the exterior of a drill pipe to rotate therewith and an outer buffer ring rotatably mounted on the inner hub to allow relative rotation between the drill pipe and the outer buffer... | 12/03/1996 |
| 5553676 | Reversible expander Several designs of reversible expanders (10, 50, 100, 150) are disclosed for use on an underground boring tool (14) of the type using an air impact hammer. The reversible expanders allow a borehole of larger diameter than the tool to be formed. The revers... | 09/10/1996 |
| 5542454 | Free flow low energy pipe protector A pipe protector has been designed to provide free flow and low energy. The outside surface has a bilateral asymmetrical pattern when comparing the approximate top half of the pipe protector to the bottom half of the pipe protector. The pattern has raised... | 08/06/1996 |
| 5199510 | Raise boring head and stem assembly method An improved method for assembling a stem within a mating, close fitting hole of a raise boring head by attaching an overhead beam to the body of the raise boring bit, supporting the stem with its longitudinal axis aligned with that of the beam and that of... | 04/06/1993 |
| 5069297 | Drill pipe/casing protector and method A drill pipe/casing protector is mounted on a length of drill pipe adjacent to the tool joint of a length of rotary drill pipe that rotates within a well bore or a casing cemented in a well bore in which drilling operations are conducted. The drill pipe/c... | 12/03/1991 |
| 4796670 | Drill pipe protector A drill pipe protector which surrounds and embraces a section of drill pipe. The protector includes at least an outer portion and surface made of an elastomeric material in which a quantity of small, hard particles are interspersed. During drilling operat... | 01/10/1989 |
| 4705121 | Pin, especially for clamping a sleeve-shaped protector or centering device on its tube serving for drilling an underground deposit Invention relates to a pin for clamping a sleeve 1 moulded from rubber and having a crenellated cut, of which the teeth 7 and spaces 8 match one another, so that the sleeve can be closed over a tube to be protected, the said sleeve being of the type with ... | 11/10/1987 |
| 4602690 | Detachable apparatus for preventing differential pressure sticking in wells A removable porous layer is placed on the outside of various well implements. The layer allows movement of liquid toward sites of localized low pressure and therefore prevents differential pressure stickage of the well implements on the borehole wall.... | 07/29/1986 |
| 4484785 | Tubing protector A device for protecting and securing small diameter tubular members along a pipe string in a wellbore is disclosed. The protector is designed to fit about the joints of connecting pipe sections and comprises a sleeve assembly capable of being arranged and... | 11/27/1984 |
| 4398772 | Drill pipe protector A drill pipe protector is disclosed which provides a fluid-tight hydraulic seal between the protector and the drill pipe. The protector comprises a cylindrical body of an elastomer which is longitudinally split and encases a cylindrical and similarly spli... | 08/16/1983 |
| 4266578 | Drill pipe protector A cylindrical drill pipe protector (10) having a skeleton (34,36) with inner (40) and outer (42) layers of rubber bonded to the skeleton.... | 05/12/1981 |
| 4021083 | Snap-lock end ring A centralizer is disclosed having outwardly bowed leaf springs held by one or more circular end bands. The end bands have two or more sections which are radially overlapped and snapped together to hold the centralizer about a cylindrical object. The end b... | 05/03/1977 |
