Patents by Inventor James Helwig

James Helwig 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).

  • Integrated permeability measurement and resistivity imaging tool
    Patent number: 5335542
    Abstract: A borehole tool having adjacently located fluid injection/withdrawal apparatus and an electromagnetic measurement apparatus is provided. The electromagnetic measurement apparatus can be an imaging apparatus for helping set the tool in desired locations for permeability testing via fluid injection or withdrawal. In a second mode, during fluid injection or withdrawal, and if desired, before and/or after injection or withdrawal, a plurality of electromagnetic measurements (images) are made. Based on the electromagnetic and hydraulic measurements, and a model which interrelates the measurements, determinations are made as to various characteristics of the formation, including effective permeabilities. Related methods for utilizing the tool and for treating the data in an integrated fashion are also set forth.
    Type: Grant
    Filed: February 12, 1993
    Date of Patent: August 9, 1994
    Assignee: Schlumberger Technology Corporation
    Inventors: T. S. Ramakrishnan, David Rossi, Yogesh Dave, William Murphy, Richard Plumb, Peter Goode, Fikri Kuchuk, James Helwig, Francois M. Auzerais, Elizabeth B. Dussan V.