06176323 is referenced by 272 patents and cites 33 patents.

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

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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. Data from such sensors may is processed downhole and/or at the surface. Corrective actions are taken based upon the downhole measurements at the surface which may require altering the drilling fluid composition, altering the drilling fluid pump rate or shutting down the operation to clean wellbore. The drilling system contains one or more models, which may be stored in memory downhole or at the surface. These models are utilized by the downhole processor and the surface computer to determine desired fluid parameters for continued drilling. The drilling system is dynamic, in that the downhole fluid sensor data is utilized to update models and algorithms during drilling of the wellbore and the updated models are then utilized for continued drilling operations.

Title
Drilling systems with sensors for determining properties of drilling fluid downhole
Application Number
9/111368
Publication Number
6176323 (B1)
Application Date
June 26, 1998
Publication Date
January 23, 2001
Inventor
Valeri Papanyan
Houston
TX, US
Hatem N Nasr
Houston
TX, US
John W Harrell
Waxahachie
TX, US
Volker Krueger
Celle
US
William W Smith Jr
The Woodlands
TX, US
Ronald G Bland
Houston
TX, US
John B Weirich
Spring
TX, US
Agent
Madan Mossman & Sriram P C
US
Assignee
Baker Hughes Incorporated
TX, US
IPC
E21B 47/00
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