1
John B Weirich, Ronald G Bland, William W Smith Jr, Volker Krueger, John W Harrell, Hatem N Nasr, Valeri Papanyan: Drilling systems with sensors for determining properties of drilling fluid downhole. Baker Hughes Incorporated, Madan Mossman & Sriram P C, January 23, 2001: US06176323 (272 worldwide citation)

The present invention provides a drilling system for drilling oilfield boreholes or wellbores utilizing a drill string having a drilling assembly conveyed downhole by a tubing (usually a drill pipe or coiled tubing). The drilling assembly includes a bottom hole assembly (BHA) and a drill bit. The bo ...


2
Valeri Papanyan: Optical probe for analysis of formation fluids. Baker Hughes, Madan Mossman & Sriram PC, May 14, 2002: US06388251 (50 worldwide citation)

A formation fluid analysis tool has an optical probe that is inserted into the formation. The optical probe carries an internal reflectance crystal and is inserted into the formation so as to get past the mud cake, the flushed zone and the invaded zone and thus be in contact with virgin formation fl ...