US Patent 7669468 Measuring mud flow velocity using pulsed neutrons

Patent 7669468 was granted and assigned to Schlumberger on March, 2010 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

Schlumberger

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

76694680

Patent Inventor Names

Roger Griffiths0

Kenneth Stephenson0

Peter Wraight0

Date of Patent

March 2, 2010

Patent Application Number

105394650

Date Filed

November 21, 2003

Patent Primary Examiner

Hezron Williams

Patent abstract

The invention relates to methods and apparatus for determining downhole mud flow rates and other downhole parameters. A method for determining a downhole parameter includes operating a pulsed neutron generator (6), pulsing the pulsed neutron generator (6) off, detecting a substantially unactivated drilling fluid slug at a known distance (d) from the pulsed neutron generator (6), and determining a time-of-flight (t) for the unactivated drilling fluid slug to travel from the pulsed neutron generator (6) to a detection point.