Patents by Inventor Ziqiong Zheng

Ziqiong Zheng 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 of predicting the on-set of formation solid production in high-rate perforated and open hole gas wells
    Patent number: 7200539
    Abstract: A method for predicting the on-set of sand production or critical drawdown pressure (CDP) in high flow rate gas wells. The method describes the perforation and open-hole cavity stability incorporating both rock and fluid mechanics fundamentals. The pore pressure gradient is calculated using the non-Darcy gas flow equation and coupled with the stress-state for a perfectly Mohr-Coulomb material. Sand production is assumed to initiate when the drawdown pressure condition induces tensile stresses across the cavity face. Both spherical and cylindrical models are presented. The spherical model is suitable for cased and perforated applications while the cylindrical model is used for a horizontal open-hole completion.
    Type: Grant
    Filed: February 21, 2001
    Date of Patent: April 3, 2007
    Assignee: Baker Hughes Incorporated
    Inventors: See Hong Ong, Gangerico G. Ramos, Ziqiong Zheng
  • Method of predicting the on-set of formation solid production in high-rate perforated and open hole gas wells
    Publication number: 20020147574
    Abstract: A method for predicting the on-set of sand production or critical drawdown pressure (CDP) in high flow rate gas wells. The method describes the perforation and open-hole cavity stability incorporating both rock and fluid mechanics fundamentals. The pore pressure gradient is calculated using the non-Darcy gas flow equation and coupled with the stress-state for a perfectly Mohr-Coulomb material. Sand production is assumed to initiate when the drawdown pressure condition induces tensile stresses across the cavity face. Both spherical and cylindrical models are presented. The spherical model is suitable for cased and perforated applications while the cylindrical model is used for a horizontal open-hole completion.
    Type: Application
    Filed: February 21, 2001
    Publication date: October 10, 2002
    Inventors: See Hong Ong, Gangerico G. Ramos, Ziqiong Zheng
  • Breakout control to enhance wellbore stability
    Patent number: 6179069
    Abstract: A method for encouraging breakout formation during the formation of hydrocarbon producing wellbores. Breakouts are encouraged during drilling operations to increase the stability of the formation rock immediately adjacent to the wellbore. The weight of drilling mud is selected to provide breakout control, and the path of the wellbore can be selected in directions to help breakout control. Efficient drilling operations are facilitated, and the resulting wellbore provides enhanced stability as hydrocarbon fluids arc produced from a subsurface reservoir into the wellbore interior.
    Type: Grant
    Filed: June 23, 1999
    Date of Patent: January 30, 2001
    Assignee: Baker Hughes Incorporated
    Inventor: Ziqiong Zheng