1
Borislav J Tchakarov, Rocco DiFoggio, Stanislav W Forgang, Otto N Fanini, James C Hunziker, Marcelo F Civarolo: Downhole carbon dioxide gas analyzer. Western Atlas International, Darryl M Springs, April 17, 2001: US06218662 (124 worldwide citation)

A logging tool system for analyzing the carbon dioxide concentration in a fluid sample downhole in a borehole. A chamber is filled with the fluid sample and is closed to isolate the fluid sample from the borehole. The interior chamber volume is expanded to decompress the fluid sample, and a transmit ...


2
Saeed Rafie, Stephen T Ha, Josephine Lopez, James C Hunziker, Mark R Doyle: Combination fiber-optic/electrical conductor well logging cable. Western Atlas International, Richard A Fagin, February 27, 1996: US05495547 (69 worldwide citation)

The present invention is a well logging cable including first conductor elements, each of the first elements consisting of a steel wire surrounded by copper strands and covered in an electrically insulating material, and at least one second conductor element including at least one optical fiber encl ...


3
Borislav J Tchakarov, Rocco DiFoggio, Stanislav W Forgang, Otto N Fanini, Marcelo F Civarolo, James C Hunziker: Down hole gas analyzer method and apparatus. Baker Hughes Incorporated, Madan Mossman & Sriram P C, September 30, 2003: US06627873 (40 worldwide citation)

A logging while drilling and wire line system for analyzing the concentration of carbon dioxide or another substance, in a sample down hole in a bore hole. A chamber is filled with a sample that may be fluid, or condensate and gas. The interior chamber volume is selectably expandable for decompressi ...


4
James E Brewer, Borislav Tchakarov, Paul G Junghans, James C Hunziker: Flexible joint for well logging instruments. Baker Hughes Incorporated, Madan Mossman & Sriram P C, November 26, 2002: US06484801 (35 worldwide citation)

A universal joint between adjacent, electrically connected instrument housings for downhole well operations allow the connected housings to bend longitudinally as required to traverse an arced section of a well bore but does not permit relative elongation or twisting about the longitudinal axis of t ...


5
Farhat A Shaikh, James C Hunziker, Paul G Junghans, Ron Parsley: Roller standoff assemblies. Baker Hughes Incorporated, Shawn Hunter, May 27, 2014: US08733455 (4 worldwide citation)

Roller standoff assemblies and devices facilitate disposal of an interior tubular member within an exterior tubular member. Roller standoff devices include a roller cage and at least one roller supported by the roller cage to contact and roll upon the exterior tubular member.


6
Borislav J Tchakarov, James C Hunziker, Quan V Phan, Mohammed Azeemuddin, See H Ong: In-situ formation strength testing with coring. Baker Hughes Incorporated, Shawn Hunter, May 8, 2012: US08171990 (2 worldwide citation)

A method and apparatus for estimating one or more formation properties using in-situ measurements conducted at or near a coring location include a coring tool adapted to cut a core sample in a formation, a member having a distal end that engages a borehole wall substantially adjacent the core sample ...


7
Shawn A Olsen, Roger R Steinsiek, James C Hunziker: Stop collar friction clamping device. Baker Hughes Incorporated, Bracewell & Giuliani, December 13, 2011: US08074712 (2 worldwide citation)

A stop collar assembly used for axially securing and/or to resist axial sliding of a downhole tool device. The assembly provided on a housing of the downhole tool and includes a generally annular ring having an inner circumference beveled outward proximate to the ring edge. A clamp ring having a rai ...


8
James C Hunziker, Borislav J Tchakarov: Side entry leak protection for downhole tools. Baker Hughes Incorporated, Mossman Kumar & Tyler PC, January 19, 2010: US07649357

A connector for a downhole tool includes a body with one or more conductors positioned at least partially axially adjacent to an axial bore that extends at least partially through the body. In embodiments, one or more seals surrounding the body prevent fluid from flowing from a lateral opening into ...


9
James C Hunziker, Borislav Tchakarov: Side entry leak protection for sondes. Baker Hughes Incorporated, Paul S Madan, Madan Mossman & Sriram PC, February 10, 2005: US20050030036-A1

Devices and methods for construction of a sonde or other sensing tool that includes a side-entry leak protector arrangement. The side-entry leak protector provides for improved fluid sealing against fluid that might enter a sonde sub proximate the side-mounted sensor component. The side entry leak p ...


10
James C Hunziker, Borislav J Tchakarov: Side entry leak protection for downhole tools. Baker Hughes Incorporated, Madan Mossman & Sriram PC, December 7, 2006: US20060273799-A1

A connector for a downhole tool includes a body with one or more conductors positioned at least partially axially adjacent to an axial bore that extends at least partially through the body. In embodiments, one or more seals surrounding the body prevent fluid from flowing from a lateral opening into ...