Valeri O Papanyan

6388251, May 14, 2002

Jan 12, 1999

09/228721

Valeri Papanyan - Houston TX

Baker Hughes, Inc. - Houston TX

G01V 800

2502691, 250256, 25033911, 2503418

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 fluid. An acousto-optical tunable filter (AOTF) transmits a single wavelength of light from a broad band light source, the wavelength being controlled by a microwave signal from a processor. This monochromatic light is carried by an optic fiber to the internal reflectance crystal where it undergoes total reflection at the crystal faces in contact with the formation fluid. An evanescent wave propagates into the fluid with a depth of penetration related to the absorption of the light in the fluid. The reflected light carries information about this absorption which is determined by the chemical composition of the fluid. A return fiber conveys the reflected light back to a spectrometer.

61763233, Jan 23, 2001

Jun 26, 1998

9/111368

John B. Weirich - Spring TX
Ronald G. Bland - Houston TX
William W. Smith - The Woodlands TX
Volker Krueger - Celle, DE
John W. Harrell - Waxahachie TX
Hatem N. Nasr - Houston TX
Valeri Papanyan - Houston TX

Baker Hughes Incorporated - Houston TX

E21B 4700

175 40

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 bottom hole assembly preferably contains commonly used measurement-while-drilling sensors. The drill string also contains a variety of sensors for determining downhole various properties of the drilling fluid. Sensors are provided to determine density, viscosity, flow rate, clarity, compressibility, pressure and temperature of the drilling fluid at one or more downhole locations. Chemical detection sensors for detecting the presence of gas (methane) and H. sub. 2 S are disposed in the drilling assembly. Sensors for determining fluid density, viscosity, pH, solid content, fluid clarity, fluid compressibility, and a spectroscopy sensor are also disposed in the BHA.