Patents by Inventor Roger John Card

Roger John Card 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).

  • On-the-fly control of delayed borate-crosslinking of fracturing fluids
    Patent number: 5877127
    Abstract: A method is provided for controlling the delay time of aqueous borate-crosslinked polysaccharide-based fluids for hydraulic fracturing and related applications which allows on-the-fly control of the delay time without comprising overall fluid integrity. Without having to modify the total boron content nor pH of the fracturing fluid, the delay time is controlled by adding a polyol to the fracturing fluid at a first rate, determining the resulting delay time and then adjusting the rate of the polyol addition to the fracturing fluid until the desired delay time is achieved.
    Type: Grant
    Filed: May 1, 1996
    Date of Patent: March 2, 1999
    Assignee: Schlumberger Technology Corporation
    Inventors: Roger John Card, Kenneth H. Nimerick, L. Jack Maberry, S. Bruce McConnell, Erik Bentley Nelson