61
Roderick K Abbott, Padmasiri D Seneviratne, Joseph A R Picard: Pipe spinner. Varco International, William P Green, January 3, 1984: US04423645 (2 worldwide citation)

A spinner for turning a well drilling kelly or the like and including a member connectible to the kelly to drive it rotatively, a reversible motor, and a drive between the rotor of the motor and said member including two gears for driving the member in opposite directions respectively, with the two ...


62
Stephen B Wetch, Gregory A Goris, Igor Krasnov: Alternate forms of, side drive drilling. Varco International, Joseph R Dwyer, October 24, 1989: US04875529 (2 worldwide citation)

Disclosed is a method and apparatus comprising a side drive system with a drive shaft (24, 24a) driven from the platform level (10) and powering a drilling unit (16) for rotating drill pipe (14). Except for the tethering of the drive shaft at the top of the derrick (60-64) and its coupling to a powe ...


63
George I Boyadjieff: Well pipe spinning and torqueing apparatus. Varco International, William P Green, August 31, 1982: US04346631 (1 worldwide citation)

A device for turning a section of well pipe to connect it to or disconnect it from a pipe string includes a power unit to be mounted at a side of a well and having a part, preferably a piston, which is power actuable in opposite directions, with that part acting upon movement in one direction to exe ...


64
Boyadjieff George I, Otsap Ben A: Well safety valve having mechanism shielded from fluid flow. Varco International, Green William P, November 12, 1974: US3847216 (1 worldwide citation)

A well safety valve to be lowered into and located within a well and be actuated from the surface of the earth by exertion of upward tensioning force on a cable or the like, with the valve having mechanism for effecting downward displacement of the valve element or elements proper in response to upw ...


65
Boyadjieff George I, Otsap Ben A: Ball type well safety valve apparatus. Varco International, Green William P, November 12, 1974: US3847218 (1 worldwide citation)

A well safety valve to be lowered into a well and be actuated from a location near the surface of the earth by an elongated flexible line or the like, with the valve unit including a ball valve containing a fluid passage and mounted pivotally to a carrier structure and actuable from a closed positio ...


66
Boyadjieff George I: Coins mecaniques de serrage, Power slip unit. Varco International, December 26, 1978: CA1045112 (1 worldwide citation)

POWER SLIP UNITAbstract of the Disclosure A power slip for supporting a well pipe, including aplurality of downwardly tapering slips adapted to be wedgedagainst a pipe by engagement with a slip bowl, with the slipsbeing mounted for movement between an active position about thepipe and a retracted po ...


67
John M Nelson, William L Snider, Gary W Bogema, David V Person: Method and apparatus for lining tubulars and lined tubular assembly. Varco International, Finnegan Henderson Farabow Garrett & Dunner L, September 25, 2001: US06294042

A lined tubular assembly and a method and apparatus for lining an elongated tubular article to form the assembly. The lined tubular assembly has a metal tube with a non-metallic liner bonded to the internal surface thereof by a bonding agent. A non-metallic flanged end piece is secured to each end o ...


68
Boyadjieff George I: Systeme de forage a motorisation en sommet, Top drive drilling systems. Varco International, FETHERSTONHAUGH & CO, December 6, 1988: CA1246048

"TOP DRIVE DRILLING SYSTEMS " Abstract of the Disclosure Methods and apparatus for facilitating the drillingof a well with a top drive unit having a motor which isconnected to the upper end of the drill string and movesupwardly and downwardly therewith. The methods and appara-tus of the invention en ...


69
Krasnov Igor: Coulisse de tube conducteur de forage, Well slip unit. Varco International, FETHERSTONHAUGH & CO, December 21, 1982: CA1137971

WELL SLIP UNIT Abstract of the Disclosure A slip unit for releasably supporting a well pipe,including a support structure to be positioned on and turnwith a rotary table and preferably taking the form of a slipbowl, and a vertically movable slip carrier structuresuspending a number of pipe-gripping ...


70
Krasnov Igor: Mecanisme a coins de serrage pour train de tiges de forage, Well slip unit. Varco International, FETHERSTONHAUGH & CO, May 3, 1983: CA1145740

WELL SLIP UNIT Abstract of the Disclosure A slip unit for releasably supporting a well pipe,including a support structure to be positioned on and turnwith a rotary table and preferably taking the form of a slipbowl, and a vertically movable slip carrier structuresuspending a number of pipe-gripping ...