Patents by Inventor Shrihari Kelkar

Shrihari Kelkar 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).

  • Filter cake cleanup and gravel pack methods for oil based or water based drilling fluids
    Patent number: 6631764
    Abstract: A method of gravel packing a wellbore which has at least one aperture therein that provides a fluid flow path between the wellbore and an adjacent subterranean formation. At least a part of the formation adjacent to the open hole has a filter cake coated thereon that comprises a water and oil emulsion. The method of gravel packing comprises injecting into the wellbore a gravel pack composition that comprises gravel and a carrier fluid. The carrier fluid comprises an aqueous liquid having a pH that is outside the range at which the filter cake emulsion is stable. The aqueous liquid is present in an amount effective to invert the water in oil emulsion in the filter cake when the carrier fluid comes into contact with the filter cake. As a result, gravel is deposited at or adjacent to the aperture in the wellbore and some of the filter cake is removed.
    Type: Grant
    Filed: February 6, 2001
    Date of Patent: October 14, 2003
    Assignee: Schlumberger Technology Corporation
    Inventors: Mehmet Parlar, Colin J. Price-Smith, Raymond J. Tibbles, Shrihari Kelkar, Mark E. Brady, Elizabeth W. A. Morris
  • Filter cake cleanup and gravel pack methods for oil based or water based drilling fluids
    Publication number: 20010036905
    Abstract: A method is disclosed of gravel packing a wellbore which has at least one aperture therein that provides a fluid flow path between the wellbore and an adjacent subterranean formation. At least a part of the formation adjacent to the open hole has a filter cake coated thereon that comprises a water and oil emulsion. The method of gravel packing comprises injecting into the wellbore a gravel pack composition that comprises gravel and a carrier fluid. The carrier fluid comprises an aqueous liquid having a pH that is outside the range at which the filter cake emulsion is stable. The aqueous liquid is present in an amount effective to invert the water in oil emulsion in the filter cake when the carrier fluid comes into contact with the filter cake. As a result, gravel is deposited at or adjacent to the aperture in the wellbore and some of the filter cake is removed.
    Type: Application
    Filed: February 6, 2001
    Publication date: November 1, 2001
    Inventors: Mehmet Parlar, Colin J. Price-Smith, Raymond J. Tibbles, Shrihari Kelkar, Mark E. Brady, Elizabeth W.A. Morris