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| Number | Title | Issue Date |
| 8096352 | Centralizer for tubular elements A centralizer for tubular elements is provided which includes an inner part formed by a first material having high mechanical performance and chemical stability and an outer part arranged on said inner part, formed by a second material. The second material may be an... | 01/17/2012 |
| 7918274 | Downhole tools There is disclosed an improved tool, e.g. adapted to comprise at least part of a well completion assembly or well drilling assembly. The invention provides an improved downhole tool (or device) having a friction factor of the order of ten times less than those known... | 04/05/2011 |
| 7255165 | Field-installable rod guide A field-installable rod guide for a rod moveable within an oilfield tubular having an interior tubular surface for driving a downhole pump to pump liquids to the surface through the oilfield tubular. The rod guide comprises a body including interfitting body members... | 08/14/2007 |
| 7159668 | Centralizer A centralizer 10 for mounting on a tubular member such as a section of casing, together with one or more stops 42, 48 for retaining the centralizer thereon. The stops 42, 48 are provided with profiles for engaging the centralizer to restrict rot... | 01/09/2007 |
| 7108063 | Connectable rod system for driving downhole pumps for oil field installations Improved sucker rod joints for down hole petroleum pumping applications are provided within the form factor of standard API sucker rods, such that existing inventory in suitable condition is fully usable in more demanding applications. The pin ends are selected or p... | 09/19/2006 |
| 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 |
| 6942254 | Threaded connection engagement and disengagement system and method A system for making and breaking connections between the pin ends of sucker rods and coupling sleeves employs a hydraulically powered system of radially driven gripper heads which are interchangeable to accept different sucker rod sizes. A torqueing system adjacent ... | 09/13/2005 |
| 6837643 | Rod coupling A rod coupling formed of a tubular housing having a first box end and a second box end. The tubular housing has an interior surface defining a bore extending along the tubular housing from the first box end to the second box end, and has an exterior surface. Plural ... | 01/04/2005 |
| 6830102 | Centraliser A centraliser primarily for use when casing an oil or gas well, the centraliser having low frictions coatings or sliders on the outer surface thereof. ... | 12/14/2004 |
| 6776247 | Stabilizer tool block wear pad assembly The present invention is for a drill string stabiliser tool (18) used in borehole drilling. The tool includes a symmetrical body (20) with a plurality of external recesses (22). The recesses (22) have internal opposite surfaces (23... | 08/17/2004 |
| 6637509 | Wellhead stuffing box support assembly A stuffing box support assembly is configured to be positioned between a production pumping tree and a stuffing box of a wellhead. In use, the support assembly functions like a joint between the wellhead production tree and the stuffing box. The support a... | 10/28/2003 |
| 6516877 | Sucker rod protector An apparatus for reducing abrasive wear within a housing that includes a body having at least one protrusion selectively positioned and extending outwardly from the outer surface thereof, the body being placed concentrically within the housing and rubbing... | 02/11/2003 |
| 6065537 | Rod guide with both high erodible wear volume and by-pass area A rod guide fixedly molded around the shank of a sucker rod string with the rod guide including a radially inner non-erodible zone and a radially outer erodible zone. The non-erodible zone includes a radially inner substantially sleeve-shaped portion havi... | 05/23/2000 |
| 5941312 | Method of fabricating a rod guide, and a rod guide/sucker rod combination A method of fabricating a rod guide. The first step involves providing a sucker rod having an exterior surface with a raised profile. The second step involves providing a split sleeve having at least one segment. The split sleeve has an interior surface w... | 08/24/1999 |
| 5740862 | Rod guide assembly A rod guide assembly having a mount rigidly molded on rod shank, a centralizer rotatably mounted on the mount having, closure means between the mount and the centralizer for preventing flow of particles into the centralizer.... | 04/21/1998 |
| 5452760 | Well pump tubing scrapers A well pump sucker rod scraper arrangement that includes a sucker rod, scrapers fixed to said rod and a scraper at spaced apart positions movably mounted on said rod, between adjacent pairs of the fixed scrapers. The movable and fixed scrapers each have s... | 09/26/1995 |
| 5339896 | Field installable rod guide and method A rod guide is provided for centering a sucker rod within a tubular string that powers the pump within a well bore. The rod guide comprises a spool securable to the rod and having upper and lower end members thereon, and a plastic material sleeve extendin... | 08/23/1994 |
| 5181565 | Well probe able to be uncoupled from a rigid coupling connecting it to the surface A well probe including two offset shoes fixed outside of a tubular column and an intermediate shoe provided with a central passage having a cross section larger than a cross section of the column. The intermediate shoe is connected to a lower offset shoe ... | 01/26/1993 |
| 5119876 | Well tool A stabilizer rod connectible in a sucker rod string of a sub-surface well pump having a shank of greater diameter than the shanks of the sucker rods of the string and connector means at its opposite ends whose diameter is not greater than that of the conn... | 06/09/1992 |
| 4809777 | Well tool A centralizer for pump rod string which minimizes the resistance offered thereby to flow of well fluids therepast having two pairs of longitudinally and circumferentially spaced radially outwardly extending ribs.... | 03/07/1989 |
| 4640349 | Flexible sucker rod unit A flexible coupler is provided for the sinker bars of the sucker rod string of a deep oil well. The coupling unit has a flexible section so that the coupling will flex to a greater extent than the sinker bars. The coupling also has a cylindrical bearing s... | 02/03/1987 |
