1
Padmasiri Daya Seneviratne: Apparatus and method for rapid replacement of upper blowout preventers. Varco International, Christie Parker & Hale, August 21, 2001: US06276450 (114 worldwide citation)

Apparatus and method for rapid replacement of upper inside blowout preventers (IBOP) on a top drive system (TDS) utilizes a hydraulic pressure booster to increase the operating pressure of a pipe handler/torque wrench, an air amplifier to increase the air pressure to a main shaft brake of the TDS in ...


2
Padmasiri Daya Seneviratne: Washpipe assembly. Varco I P, Christie Parker & Hale, April 27, 2004: US06725949 (42 worldwide citation)

A drilling system and a method of using a drilling system that has a first rotatable tubular connector, a second non-rotatable tubular connector and a washpipe assembly having at least one dynamic seal and defining a fluid conduit having at one end a first mating connector and at another end a secon ...


3
Padmasiri Daya Seneviratne, Lawrence Wells, David B Mason: Triple valve blow out preventer. Varco I P, Christie Parker & Hale, October 30, 2007: US07287544 (20 worldwide citation)

A triple-valve internal blow out preventer having unitary construction is provided, each valve including a tubular assembly having a central passageway with upper and lower seats mounted therein. A ball is rotatably received between the upper and lower seats and includes an external surface and a ce ...


4
Padmasiri Daya Seneviratne, Lawrence Wells, David B Mason: Internal blow out preventer ball and seat. Varco I P, Christie Parker & Hale, October 17, 2006: US07121295 (5 worldwide citation)

An internal blow out preventer is provided that includes a ball valve including a tubular assembly having a central passageway with upper and lower seats mounted therein. A ball is rotatably received between the upper and lower seats and includes an external surface and a central opening, wherein th ...


5
Padmasiri Daya Seneviratne: Washpipe assembly. Varco I P, Christie Parker & Hale, February 7, 2006: US06994174 (5 worldwide citation)

A drilling system is provided that includes first and second tubular connectors and a washpipe assembly including at least one dynamic seal and defining a fluid conduit having a first mating connector and a second mating connector. The drilling system also includes a controllable torque driver arran ...


6
Padmasiri Daya Seneviratne, Lawrence E Wells, Arthur W Braman, Preston R Fox: Dual ball upper internal blow out preventer valve. National Oilwell Varco, Christie Parker & Hale, June 17, 2014: US08752653 (3 worldwide citation)

An internal blowout preventer used in drilling rigs for the discovery and production of hydrocarbons from the earth is disclosed. The internal blowout preventer has two independently and remotely operable blowout preventer valves in the same body, providing for greater service life and higher reliab ...


7
Padmasiri Daya Seneviratne: Washpipe assembly. Christie Parker & Hale, September 16, 2004: US20040177971-A1

A drilling system is provided that includes first and second tubular connectors and a washpipe assembly including at least one dynamic seal and defining a fluid conduit having a first mating connector and a second mating connector. The drilling system also includes a controllable torque driver arran ...


8
Padmasiri Daya Seneviratne, Lawrence Wells, David B Mason: Internal blow out preventer ball and seat. Christie Parker & Hale, April 21, 2005: US20050081918-A1

An internal blow out preventer is provided that includes a ball valve including a tubular assembly having a central passageway with upper and lower seats mounted therein. A ball is rotatably received between the upper and lower seats and includes an external surface and a central opening, wherein th ...


9
Padmasiri Daya Seneviratne: Washpipe assembly. Christie Parker & Hale, March 20, 2003: US20030051883-A1

A drilling system and a method of using a drilling system that has a first rotatable tubular connector, a second non-rotatable tubular connector and a washpipe assembly having at least one dynamic seal and defining a fluid conduit having at one end a first mating connector and at another end a secon ...


10
Padmasiri Daya Seneviratne, Lawrence Wells, David B Mason: Triple valve blow out preventer. Christie Parker & Hale, August 31, 2006: US20060191679-A1

A triple-valve internal blow out preventer having unitary construction is provided, each valve including a tubular assembly having a central passageway with upper and lower seats mounted therein. A ball is rotatably received between the upper and lower seats and includes an external surface and a ce ...