Patents by Inventor Dan G. Smith

Dan G. Smith 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).

  • Borehole fracture detection using magnetic powder
    Patent number: 4491796
    Abstract: A method for detecting fractures in a formation penetrated by a borehole wherein the fracture is first filled with a magnetic material and the formation then logged with an instrument that responds to the earth's magnetic field. The fracture can be filled with a magnetic material by including it in the drilling mud when the well is drilled and changing the mud system before logging. The logging tool can comprise a simple compass or a magnetometer.
    Type: Grant
    Filed: March 18, 1982
    Date of Patent: January 1, 1985
    Assignee: Shell Oil Company
    Inventor: Dan G. Smith