Patents by Inventor Marvin E. Markley

Marvin E. Markley has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Measuring formation density through casing
    Patent number: 7292942
    Abstract: A method of determining formation density in a cased hole environment using a logging tool having a gamma ray source, a long spacing detector, and a short spacing detector that includes developing one or more cased hole calibration relationships that utilize differences between scattered gamma rays observed by short spacing detectors and scattered gamma rays observed by long spacing detectors to determine corrected formation density values, and using the cased hole calibration relationships and scattered gamma ray measurements obtained by the long spacing detector and the short spacing detector to determine the formation density. An associated article of manufacture and computerized well logging system are also described.
    Type: Grant
    Filed: January 22, 2004
    Date of Patent: November 6, 2007
    Assignee: Schlumberger Technology Corporation
    Inventors: Darwin V. Ellis, Marvin E. Markley
  • Measuring formation density through casing
    Publication number: 20040210393
    Abstract: A method of determining formation density in a cased hole environment using a logging tool having a gamma ray source, a long spacing detector, and a short spacing detector that includes developing one or more cased hole calibration relationships that utilize differences between scattered gamma rays observed by short spacing detectors and scattered gamma rays observed by long spacing detectors to determine corrected formation density values, and using the cased hole calibration relationships and scattered gamma ray measurements obtained by the long spacing detector and the short spacing detector to determine the formation density. An associated article of manufacture and computerized well logging system are also described.
    Type: Application
    Filed: January 22, 2004
    Publication date: October 21, 2004
    Inventors: Darwin V. Ellis, Marvin E. Markley