Patents by Inventor Dhandayuthapani Kannan

Dhandayuthapani Kannan 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).

  • Interpreting well test measurements
    Patent number: 8620636
    Abstract: Based on measurements that are obtained from a well test, a pressure in the well is modeled as a function of at least a skin effect factor that varies with time. The results of the modeling may be used to estimate at least one well parameter, such as a formation parameter and/or a well pressure, as examples.
    Type: Grant
    Filed: February 13, 2007
    Date of Patent: December 31, 2013
    Assignee: Schlumberger Technology Corporation
    Inventors: Lang Zhan, Fikri J. Kuchuk, James G. Filas, Dhandayuthapani Kannan
  • Method and apparatus to quantify fluid sample quality
    Patent number: 8020437
    Abstract: The invention relates to fluid sampling in a test that is used to determine physical and chemical characteristics of the fluids in a subterranean reservoir. The method reconstructs the entire pressure history of the fluid parcel that is captured in the fluid samplers during a test. Using this reconstructed pressure history of the samples, the quality of the samples, particularly, whether there is a phase change in the samples during the test, can be accurately quantified.
    Type: Grant
    Filed: June 26, 2007
    Date of Patent: September 20, 2011
    Assignee: Schlumberger Technology Corporation
    Inventors: Lang Zhan, Dhandayuthapani Kannan, James G. Filas, Graham Birkett
  • Downhole disconnect mechanism
    Patent number: 7992638
    Abstract: A release device includes a first sub, a second sub, and a connector separably connecting the first and the second sub, wherein the connector includes a shear member disposed with the first sub and a collar connected between the second sub and the shear member.
    Type: Grant
    Filed: January 15, 2009
    Date of Patent: August 9, 2011
    Assignee: Schlumberger Technology Corporation
    Inventors: Jim B. Benton, Dhandayuthapani Kannan
  • System and method for optimizing production in a well
    Patent number: 7849920
    Abstract: For optimizing well production, intervals are selected along a deviated wellbore, and a well test and treatment string is deployed in the wellbore. Each interval is then isolated to enable performance of desired testing. The test data obtained is evaluated to determine an appropriate remedial action which is then implemented via the well test and treatment string. The system and method enable the testing and treatment of a plurality of intervals along a horizontal well during the same run downhole.
    Type: Grant
    Filed: December 20, 2007
    Date of Patent: December 14, 2010
    Assignee: Schlumberger Technology Corporation
    Inventors: Dhandayuthapani Kannan, David E. Sask, Lang Zhan, James G. Filas
  • Tool using outputs of sensors responsive to signaling
    Patent number: 7775273
    Abstract: An apparatus for use in a wellbore includes a tool string and a plurality of sensors, which include at least a first sensor to detect pressure signals in an inner conduit of the tool string and at least a second sensor to detect pressure signals in an annulus outside the tool string. A controller actuates a tool in the tool string in response to a logical combination of outputs from the sensors, where the outputs of the sensors are responsive to the respective pressure signals.
    Type: Grant
    Filed: July 25, 2008
    Date of Patent: August 17, 2010
    Assignee: Schlumberber Technology Corporation
    Inventors: David Merlau, Lang Zhan, Dhandayuthapani Kannan, Jim B. Benton
  • DOWNHOLE DISCONNECT MECHANISM
    Publication number: 20100175870
    Abstract: A release device includes a first sub, a second sub, and a connector separably connecting the first and the second sub, wherein the connector includes a shear member disposed with the first sub and a collar connected between the second sub and the shear member.
    Type: Application
    Filed: January 15, 2009
    Publication date: July 15, 2010
    Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Jim B. Benton, Dhandayuthapani Kannan
  • TOOL USING OUTPUTS OF SENSORS RESPONSIVE TO SIGNALING
    Publication number: 20100018714
    Abstract: An apparatus for use in a wellbore includes a tool string and a plurality of sensors, which include at least a first sensor to detect pressure signals in an inner conduit of the tool string and at least a second sensor to detect pressure signals in an annulus outside the tool string. A controller actuates a tool in the tool string in response to a logical combination of outputs from the sensors, where the outputs of the sensors are responsive to the respective pressure signals.
    Type: Application
    Filed: July 25, 2008
    Publication date: January 28, 2010
    Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: David Merlau, Lang Zhan, Dhandayuthapani Kannan, Jim B. Benton
  • SYSTEM AND METHOD FOR OPTIMIZING PRODUCTION IN A WELL
    Publication number: 20090159275
    Abstract: A technique is provided for optimizing well production. Intervals are selected along a deviated wellbore, and a well test and treatment string is deployed in the wellbore. Each interval is then isolated to enable performance of desired testing. The test data obtained is evaluated to determine an appropriate remedial action which is then implemented via the well test and treatment string. The system and method enable the testing and treatment of a plurality of intervals along a horizontal well during the same run downhole.
    Type: Application
    Filed: December 20, 2007
    Publication date: June 25, 2009
    Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Dhandayuthapani Kannan, David E. Sask, Lang Zhan, James G. Filas
  • Technique and apparatus for use in well testing
    Patent number: 7478555
    Abstract: A technique that is usable with a well includes communicating fluid from the well into a downhole chamber in connection with a well testing operation. The technique includes monitoring a downhole parameter that is responsive to the communication to determine when to close the chamber.
    Type: Grant
    Filed: August 25, 2005
    Date of Patent: January 20, 2009
    Assignee: Schlumberger Technology Corporation
    Inventors: Lang Zhan, James G. Filas, Dhandayuthapani Kannan
  • Method and Apparatus to Quantify Fluid Sample Quality
    Publication number: 20090000785
    Abstract: The invention relates to fluid sampling in a test that is used to determine physical and chemical characteristics of the fluids in a subterranean reservoir. The method reconstructs the entire pressure history of the fluid parcel that is captured in the fluid samplers during a test. Using this reconstructed pressure history of the samples, the quality of the samples, particularly, whether there is a phase change in the samples during the test, can be accurately quantified.
    Type: Application
    Filed: June 26, 2007
    Publication date: January 1, 2009
    Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Lang Zhan, Dhandayuthapani Kannan, James G. Filas, Graham Birkett
  • INTERPRETING WELL TEST MEASUREMENTS
    Publication number: 20070162235
    Abstract: Based on measurements that are obtained from a well test, a pressure in the well is modeled as a function of at least a skin effect factor that varies with time. The results of the modeling may be used to estimate at least one well parameter, such as a formation parameter and/or a well pressure, as examples.
    Type: Application
    Filed: February 13, 2007
    Publication date: July 12, 2007
    Applicant: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Lang Zhan, Fikri Kuchuk, James Filas, Dhandayuthapani Kannan
  • Technique and apparatus for use in well testing
    Publication number: 20070050145
    Abstract: A technique that is usable with a well includes communicating fluid from the well into a downhole chamber in connection with a well testing operation. The technique includes monitoring a downhole parameter that is responsive to the communication to determine when to close the chamber.
    Type: Application
    Filed: August 25, 2005
    Publication date: March 1, 2007
    Inventors: Lang Zhan, James Filas, Dhandayuthapani Kannan