Patents by Inventor Raj K. Prasad

Raj K. Prasad 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).

  • Method and apparatus for reducing paraffin and asphaltene deposits in pumping oil wells
    Patent number: 6513593
    Abstract: An apparatus for reducing paraffin and asphaltene deposits in a pumping oil well including a polish rod having a portion extending outwardly of the earth and having a portion extending into an oil string tubing, a sucker rod string interconnected to the polish rod and extending through the oil string casing into the earth, and an insulating rod interconnected to a lower end of the polish rod and interconnected to an upper end of the sucker rod string. The insulating rod is formed of a material having a thermal conductivity of 0.0167 to 0.06 BTU/(sq. ft.)(hr)(deg.F)(ft). The insulating rod is formed of a body of fiberglass material, an upper connector affixed to the body and formed of a steel material, and a lower connector affixed to the body and formed of a steel material.
    Type: Grant
    Filed: April 30, 2001
    Date of Patent: February 4, 2003
    Inventor: Raj K. Prasad
  • METHOD AND APPARATUS FOR REDUCING PARAFFIN AND ASPHALTENE DEPOSITS IN PUMPING OIL WELLS
    Publication number: 20020157832
    Abstract: An apparatus for reducing paraffin and asphaltene deposits in a pumping oil well including a polish rod having a portion extending outwardly of the earth and having a portion extending into an oil string tubing, a sucker rod string interconnected to the polish rod and extending through the oil string casing into the earth, and an insulating rod interconnected to a lower end of the polish rod and interconnected to an upper end of the sucker rod string. The insulating rod is formed of a material having a thermal conductivity of 0.0167 to 0.06 BTU/(sq.ft.)(hr)(deg.F)(ft). The insulating rod is formed of a body of fiberglass material, an upper connector affixed to the body and formed of a steel material, and a lower connector affixed to the body and formed of a steel material.
    Type: Application
    Filed: April 30, 2001
    Publication date: October 31, 2002
    Inventor: Raj K. Prasad
  • Method of determining vertical permeability of a subsurface earth formation
    Patent number: 5156205
    Abstract: A method of determining vertical permeability of a subsurface earth formation having the steps of perforating a production casing for an initial area less than a thickness of the subsurface earth formation, measuring reservoir fluid flow and pressure through the initial area perforation, perforating the production casing for a production interval of an area greater than the initial area perforation, measuring reservoir fluid flow and pressure through the perforated production interval, establishing a value corresponding to horizontal permeability from the measured reservoir fluid flow and pressure through the perforated production interval, simulating pressure profiles using values of vertical permeability in combination with the established value of horizontal permeability, and determining the simulated pressure profile which generally corresponds to a measured pressure profile from the initial area perforation.
    Type: Grant
    Filed: July 8, 1991
    Date of Patent: October 20, 1992
    Inventor: Raj K. Prasad