Patents by Inventor Francis Tuedor

Francis Tuedor 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).

  • Scale inhibitors compatible with sandstone acidizing
    Patent number: 7950462
    Abstract: Methods are given for making scale inhibitors, that were previously incompatible with fluids containing fluoride ion, compatible with fluids containing fluoride ion. Examples of such scale inhibitors include phosphonates and phosphino-polycarboxylates. The method is replacing alkali metal and alkaline earth metal cations, present in salts or bases, or as counter ions of the scale inhibitors, with hydrogen or ammonium ions. Methods of inhibiting scale formation and of dissolving scales are also given.
    Type: Grant
    Filed: April 23, 2010
    Date of Patent: May 31, 2011
    Assignee: Schlumberger Technology Corporation
    Inventors: Zhijun Xiao, Marieliz Garcia-Lopez de Victoria, Francis Tuedor
  • Scale Inhibitors Compatible with Sandstone Acidizing
    Publication number: 20100200238
    Abstract: Methods are given for making scale inhibitors, that were previously incompatible with fluids containing fluoride ion, compatible with fluids containing fluoride ion. Examples of such scale inhibitors include phosphonates and phosphino-polycarboxylates. The method is replacing alkali metal and alkaline earth metal cations, present in salts or bases, or as counter ions of the scale inhibitors, with hydrogen or ammonium ions. Methods of inhibiting scale formation and of dissolving scales are also given.
    Type: Application
    Filed: April 23, 2010
    Publication date: August 12, 2010
    Inventors: Zhijun Xiao, Marieliz Garcia-Lopez de Victoria, Francis Tuedor
  • Scale inhibitors compatible with sandstone acidizing
    Patent number: 7703530
    Abstract: Methods are given for making scale inhibitors, that were previously incompatible with fluids containing fluoride ion, compatible with fluids containing fluoride ion. Examples of such scale inhibitors include phosphonates and phosphino-polycarboxylates. The method is replacing alkali metal and alkaline earth metal cations, present in salts or bases, or as counter ions of the scale inhibitors, with hydrogen or ammonium ions. Methods of inhibiting scale formation and of dissolving scales are also given.
    Type: Grant
    Filed: July 18, 2006
    Date of Patent: April 27, 2010
    Assignee: Schlumberger Technology Corporation
    Inventors: Zhijun Xiao, Marieliz Garcia-Lopez de Victoria, Francis Tuedor
  • Scale Inhibitors Compatible with Sandstone Acidizing
    Publication number: 20070158067
    Abstract: Methods are given for making scale inhibitors, that were previously incompatible with fluids containing fluoride ion, compatible with fluids containing fluoride ion. Examples of such scale inhibitors include phosphonates and phosphino-polycarboxylates. The method is replacing alkali metal and alkaline earth metal cations, present in salts or bases, or as counter ions of the scale inhibitors, with hydrogen or ammonium ions. Methods of inhibiting scale formation and of dissolving scales are also given.
    Type: Application
    Filed: July 18, 2006
    Publication date: July 12, 2007
    Inventors: Zhijun Xiao, Marieliz Garcia-Lopez de Victoria, Francis Tuedor