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| Number | Title | Issue Date |
| 7647963 | Interconnect rod for sucker rod string A device for coupling a driver system to a downhole string of sucker rods in a petroleum well employs a polish rod construction in which the polish rod is strengthened by an attached sleeve providing a transverse should in a predetermined plane. The sleeve is shrink... | 01/19/2010 |
| 7302999 | Scraper blade and method for scraped-surface heat exchanger A curved scraper blade for a scraped-surface heat exchanger pivots about an axis off the centerline of the blade. The profile of the blade is chosen to provide a low initial scrape angle and to change gradually if at all as the blade wears away in service. The off-c... | 12/04/2007 |
| 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 |
| 7210529 | Casing brush tool A casing brush tool for cleaning interior walls of a well bore casing. The brush tool has a free rotating sleeve mounted on a mandrel with bearings mounted between the sleeve and the mandrel to facilitate rotation. The sleeve carries a plurality of non-axial rows of... | 05/01/2007 |
| 7195730 | Method for making centralizers for centralising a tight fitting casing in a borehole Method for the centralization of drill casings in a tight borehole, both vertical and deviated, comprising the following operations: Application on the casing section in question, of an adherence strip equipped with one or more housings and rapid adjustable lever cl... | 03/27/2007 |
| 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 |
| 6926100 | Hole reaming apparatus and method An enhanced reaming apparatus and method are disclosed. A reaming assembly may have a motor and a pump that provide linear force, torsional force, and pressurized drilling fluid to a reamer to cause the reamer to enlarge the bore of a pilot hole. The reamer may have... | 08/09/2005 |
| 6808019 | Sucker rod guide and paraffin scraper for oil wells A guide for use on a sucker rod vertically reciprocated within the tubing of an oil well having an internal cylindrical surface in which the guide has an elongated tubular body portion concentrically surrounding the sucker rod with first and second guide portions in... | 10/26/2004 |
| 6749019 | Automatic paraffin removal unit An automatic paraffin removal unit, including a scraper body, a tumbler, an arc spring leaf and a return torque spring, and the upper and lower commutators having a sleeve, an open spacing ring and a tower spring. In operation, the scraper is clamped on a pumping ro... | 06/15/2004 |
| 6460617 | Drillable casing brush A casing brush for cleaning the walls of a well casing, the casing brush comprising a body (1) in which are mounted cleaning bristles (2) and an adapter (4) to connect the upper end of the body (1) to the lower end of a bridge plug. The body (1) and the a... | 10/08/2002 |
| 6182754 | Helical scraper apparatus for a reciprocating sucker rod A scraper apparatus for a reciprocating sucker rod for prevention of the wearing of grooves in well tubing. The scraper is formed by a body with two opposed spiral vanes extending 180 degrees around the body and defining flow channels positioned between t... | 02/06/2001 |
| 5755284 | Extended wear rod guide and method A rod guide is provided for centering a sucker rod within a tubular string that powers a pump within a wellbore. The rod guide comprises a rotor secured to the sucker rod and having upper and lower stop surfaces thereon, and a sleeve formed from metal to ... | 05/26/1998 |
| 5636688 | Self aligning stuffing box for pumpjack units A self aligning stuffing box for a pumpjack unit of the type having a polished rod reciprocatingly extending therethrough and downhole to a pump located at the lower end of a borehole. The stuffing box has a main body that terminates in a tubing adaptor a... | 06/10/1997 |
| 5570742 | Tubular cleaning tool A cleaning tool for tubular members has a pattern of scratching elements arranged on the outside of an elongate member such as a mandrel. The mandrel is coated with a rigid or resilient polymeric material or a combination of both. The scratching elements ... | 11/05/1996 |
| 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 |
| 4995459 | Rod guide/paraffin scraper A device used in oil wells having a cylindrical, central body with six longitudinal ribs extending radially to an outside diameter that contacts the inner wall of the tubing and acts as a sucker rod guide and paraffin scraper during the reciprocating acti... | 02/26/1991 |
| 4937907 | Cleaning plug assembly A cleaning plug assembly for cleaning condenser and heat exchanger tubes and the like is disclosed. The plug is adapted to be propelled through a tube by fluid pressure injected into the tube, and includes an elongated body supporting annular rings extend... | 07/03/1990 |
| 4919202 | Sucker rod guide bearing A sucker rod guide bearing attachable at each end to a sucker rod coupling for interconnecting sucker rod sections and centering the sucker rods with respect to a well casing, the bearing includes a cylindrical body with a threaded stud at each end for co... | 04/24/1990 |
| 4877386 | Automated sucker rod cleaning apparatus An automated apparatus for molding rod guides directly onto oilfield sucker rods including an apparatus for cleaning a short pre-determined section of the rod prior to the rod receiving a molded rod guide. The rod cleaning apparatus comprises a substantia... | 10/31/1989 |
| 4787448 | Rod guide A rod guide assembly for rods of a sucker rod string having a pair of longitudinally spaced stops rigidly secured to the sucker rod and a plurality of independently movable guide body sections mounted on the rod between these stops for limited longitudina... | 11/29/1988 |
| 4668117 | Rod coupling with mounted guide The following structure is connectible to a well sucker rod string: (a) an axially elongated coupling section having threads at its axially opposite ends for coupling to and between successive sucker rods in the string, to transmit string loading, (b) a rod gu... | 05/26/1987 |
| 4621690 | Sucker rod coupling An improved sucker rod coupling is provided for use in a rod string in a pumping oil well. An elongate, cylindrical body member is utilized. This member has internally threaded, longitudinal bores at each end thereof, for connection with the sucker rods w... | 11/11/1986 |
| 4589483 | Rod centralizer A well tool, such as a paraffin scraper or centralizer, installable on a rod of a pump rod string, which is composed of two longitudinal sections longitudinally movable relative to one another on a rod interposed therebetween into clamping locked position... | 05/20/1986 |
| 4552220 | Oil well evacuation system A system for evacuating sand, paraffin, and other particulate matter from an oil well, while simultaneously lifting the oil to the surface and stimulating its rate of production, comprises a series of transport units attached to an endless belt. The belt ... | 11/12/1985 |
| 4532988 | Sucker rod scraper method and device A plurality of sucker rod scrapers are securely attached in spaced apart relationship to a length of sucker rod for scraping paraffin deposits from the interior of a tubing string, thereby obviating obstruction to the flow of oil therethrough by maintaini... | 08/06/1985 |
| 4480843 | Polymeric annular snubbing apparatus For use in hydraulic workover operations for oil and gas wells, a snubbing element is provided that is made entirely of polymeric material such as polyurethane. According to a preferred embodiment of the invention, the strength and rigidity supplied to th... | 11/06/1984 |
| 4350204 | Reamer A reamer for removing paraffin, scale, ice and other accumulations from the inside surfaces of oil well pump tubing and casing which includes a hollow, tapered shell or housing fitted with external blades and having an enlarged upper internal bore area to... | 09/21/1982 |
| 4343518 | Rod guide apparatus A rod guide apparatus for a reciprocating rod comprised of two substantially identical half sections which include semicircular recesses therein and which are adapted to be lockingly clamped together adjacent opposite sides of the outer periphery of the r... | 08/10/1982 |
| 4182537 | Anti-friction sucker rod guide assembly An anti-friction sucker rod coupling and guide apparatus comprises: (a) a rod member having an anti-friction surface along its cylindrical length; (b) fasteners affixed at each end of the rod member for attaching the rod member within a sucker rod string; (c) ... | 01/08/1980 |
| 4139334 | Cable string for downhole pumps A cable string for replacement of a prior art sucker rod string used in pumping oil wells with a pump jack unit. The cable string is comprised of a plurality of individual joints of multi-strand material connected together by a coupling member. Each indiv... | 02/13/1979 |
| 4088185 | Molded plastic paraffin scrapers and centralizers A molded plastic scraper is molded in place on the sucker rod and as a result of shrink fitting of the material is firmly held in place thereon. Special configurations and materials particularly useful as and in both scrapers and centralizers are disclose... | 05/09/1978 |
| 4050514 | Paraffin sucker rod scraper and rod centralizer This invention provides a sucker rod scraper having two main portions. An inner portion is constituted by a plastic body member affixed to and surrounding the sucker rod, the body member including an elongated cylindrical portion with a plurality of longi... | 09/27/1977 |
| 3989106 | Swab device For use in oil tools which are adapted to be run travelling relatively upwardly or downwardly in drill pipe for removing mud in the drill pipe, an improvement which incorporates a swab cup which flares out to contact the side wall of the pipe for the purp... | 11/02/1976 |
| 3983938 | Freely slidable paraffin scraping and removing tool for cleaning oil well tubing A simple cylindrical paraffin scraping tool adapted to slidably ride up and down between spaced apart stop means on a sucker rod to scrape and remove hardened paraffin and similar deposits from the interior walls of oil well tubing with the scraping tools... | 10/05/1976 |
| 3958049 | Method of inspecting and treating sucker rod A continuous process for reclaiming sucker rod which has been used downhole in a borehole. The salvaged rod is degreased, visually inspected, subjected to a shot peening operation, analyzed for structural imperfections, imparted with a protective coating ... | 05/18/1976 |
