1
Erik Rhein Knudsen, Claude J Vercaemer, Laurent P Prouvost, Arthur W Milne, Jean Louis Pessin: Method and apparatus for cementing a well. Schlumberger Technology Corporation, Robin C Nava, Thomas O Mitchell, July 31, 2001: US06267181 (83 worldwide citation)

In one embodiment, the invention relates to a method or process, useful in cementing a well, especially a hydrocarbon well, which is characterized by the use of increased external and internal diameter liners, the method being characterized by provision and use of a novel liner and liner-tool assemb ...


2
Erik Rhein Knudsen, Mark A Fredette: Apparatus and method for retrieving and/or communicating with downhole equipment. Schlumberger Technology Corporation, Gary L Bush, Wayne I Kanak, John J Ryberg, January 11, 1994: US05278550 (73 worldwide citation)

Method and apparatus for fishing for and/or communicating with subsurface apparatus. In a preferred embodiment, a subsurface logging-while-drilling (LWD) or measuring-while-drilling (MWD) apparatus is placed in tandem with a drill string near the bottom of a borehole. The LWD apparatus includes a su ...


3
Peter D Wraight, Edouard Marienbach, Jean Michel Hache, Erik Rhein Knudsen, Mike Evans: Method and apparatus for subsurface formation evaluation. Schlumberger Technology Corporation, Stephen L Borst, November 7, 1989: US04879463 (66 worldwide citation)

A measurement while drilling nuclear tool adapted to be coupled in the drill string to make formation evaluations and methods of using are described. A neutron source is positioned on the cylindrical axis of the tool while a connected gamma ray source is eccentered against an interior side of the cy ...


4
Erik Rhein Knudsen, Michael Evans, Jacques M Holenka: Stand-off compensated formation measurements apparatus and method. Schlumberger Technology Corporation, Gary L Bush, John J Ryberg, Wayne I Kanak, October 5, 1993: US05250806 (54 worldwide citation)

Apparatus and method for measuring density, porosity and other formation characteristics while drilling is disclosed. The apparatus, preferably housed in a drill collar and placed within a drill string, includes a source of neutrons and a source of gamma rays placed within a tubular body which is ad ...


5
Erik Rhein Knudsen, Claude J Vercaemer, Laurent P Prouvost, Arthur W Milne, Jean Louis Pessin: Method and apparatus for cementing a well. Schlumberger Technology Corporation, Gordon G Waggett, Robin C Nava, August 8, 2000: US06098710 (37 worldwide citation)

In one embodiment, the invention relates to a method or process, useful in cementing a well, especially a hydrocarbon well, which is characterized by the use of increased external and internal diameter liners, the method being characterized by provision and use of a novel liner and liner-tool assemb ...


6
Harjit S Kohli, Elizabeth A Mackenzie, Gary L Rogers, Jean Louis Pessin, Erik Rhein Knudsen: Mixing and pumping vehicle. Schlumberger Technology Corporation, Stephen Schlather, Catherine Menes, December 3, 2002: US06488088 (33 worldwide citation)

A vehicle, such as a truck, includes mixing and pumping equipment for mixing a liquid and a particulate material (e.g., cement) and for pumping the mixture. One application is to pump the mixture into a wellbore for cementing a casing or liner to the wellbore inner wall. The vehicle includes a cab, ...


7
Peter D Wraight, Edouard Marienbach, Jean Michel Hache, Erik Rhein Knudsen, Mike Evans: Methods and apparatus for safely measuring downhole conditions and formation characteristics while drilling a borehole. Schlumberger Technology Corporation, Stephen L Borst, March 21, 1989: US04814609 (20 worldwide citation)

A borehole logging apparatus for performing radiation based measurements has a tubular body for movement through a borehole. The tubular body includes an upwardly opening passage and an interior chamber for accommodating the positioning and lengthwise insertion and removal of an energy radiating sou ...


8
Ed Leugemors, Raafat Abbas, Erik Rhein Knudsen, William R McIntire, Jean Louis Pessin: Use of a chopper mechanism to add fibers to a well. Schlumberger Technology Corporation, Myron Stout, Daryl Wright, Robin Nava, December 4, 2012: US08322424 (1 worldwide citation)

A chopper mechanism for providing a fiber to a fluid at an oilfield. The chopper mechanism may be employed to process the fiber from an uncut form to a cut form in order to provide a mixture of the fluid and the fiber with flowback inhibiting character. Techniques of employing the chopper mechanism ...


9
Jean Louis Pessin, Joe Hubenschmidt, Erik Rhein Knudsen, Toshimichi Wago, Nathan St Michel: Sensor system for a positive displacement pump. Schlumberger Technology Corporation, Jeffrey R Anderson, Rachel E Greene, Tim Curington, March 17, 2015: US08979505 (1 worldwide citation)

A positive displacement pump is provided that includes a pump housing having a pump chamber; a plunger mounted in the pump housing for reciprocating motion in the pump chamber; a suction valve positioned to allow a fluid to enter the pump chamber upon movement of the plunger in a first direction; a ...


10
Edward Leugemors, Raafat Abbas, Erik Rhein Knudsen, William R Mcintire, Jean Louis Pessin: Use of a chopper mechanism to add fibers to a well. Schlumberger Technology Corporation, Jeffrey R Anderson, Rachel E Greene, Myron K Stout, April 28, 2015: US09016377

A chopper mechanism for providing a fiber to a fluid at an oilfield. The chopper mechanism may be employed to process the fiber from an uncut form to a cut form in order to provide a mixture of the fluid and the fiber with flowback inhibiting character. Techniques of employing the chopper mechanism ...