Patents by Inventor Stephen N Davies

Stephen N Davies 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 for water control
    Patent number: 6920928
    Abstract: A method to reduce water influx into a producing well is described comprising the steps of pumping a chemical composition into a production interval and into surrounding formation; said composition being capable of forming, firstly, a physically stabilized structure and, secondly, a chemically stabilized structure, wherein said physically stabilized structure being dissolvable by hydrocarbon containing fluids; letting said composition form said physically stabilized structure within the formation surrounding said production interval; changing pressure condition in said production interval such that the fluid flow within the surrounding formation is reversed; letting thereby in some portions of the formation hydrocarbon containing fluids dissolve said physically stabilized structure and chemically stabilize said structure in the remaining portions by a cross-linking reaction.
    Type: Grant
    Filed: March 25, 1999
    Date of Patent: July 26, 2005
    Assignee: Schlumberger Technology Corporation
    Inventors: Stephen N. Davies, Timothy G. J. Jones, Silke Olthoff, Gary J. Tustin
  • Surfactant based gelling composition for wellbore service fluids
    Patent number: 6433075
    Abstract: A composition, in particular a wellbore service fluid, comprising monomeric surfactants, preferably viscoelastic surfactants, in combination with a polymerization agent. Additionally, the fluid may contain a cross-linking agent to cross-link the polymerized surfactants.
    Type: Grant
    Filed: November 20, 2000
    Date of Patent: August 13, 2002
    Assignee: Schlumberger Technology Corporation
    Inventors: Stephen N. Davies, Timothy G. J. Jones, Gary J. Tustin
  • Setting composition for well operations
    Patent number: 6177483
    Abstract: A composition and uses of said composition are described for a latex based setting system for remedial and other operations within a wit bore. The composition comprises a pH-reducing agent and/or a coagulant. By controlling the amount of agent, the setting time of the system can be controlled in a range of 0.5 h to 15 h.
    Type: Grant
    Filed: May 25, 1999
    Date of Patent: January 23, 2001
    Assignee: Schlumberger Technology Corporation
    Inventors: Mostafa A Tehrani, Stephen N Davies, Geoffrey C Maitland