Patents by Inventor Hartwig Volz

Hartwig Volz 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).

  • Process for recovering oil from subterranean formations
    Patent number: 4589489
    Abstract: Disclosed is a method of using polymer flooding solutions in tertiary oil recovery operations in which the loss of relatively high molecular weight polymers to the formation is substantially reduced by the use of aqueous solutions of polyethylene glycol or polypropylene glycol or both, having a molecular weight of from about 600 to about 1200. The method is particularly effective under high salinity conditions.
    Type: Grant
    Filed: November 19, 1984
    Date of Patent: May 20, 1986
    Inventors: Hartwig Volz, Frank-Michael Schnepel
  • Method of reducing water production
    Patent number: 4579175
    Abstract: The disclosed invention reduces water production substantially more than hydrocarbon production in producing wells by the injection of an aqueous solution of alginates. The alginate solution or following solutions may optionally contain agents for decelerating or accelerating gelling of the alginate.
    Type: Grant
    Filed: August 10, 1984
    Date of Patent: April 1, 1986
    Assignee: Deutsche Texaco Aktiengesellschaft
    Inventors: Karl-Heinz Grodde, Hartwig Volz
  • Apparatus for mixing a solution
    Patent number: 4549813
    Abstract: Mixing apparatus for a plurality of liquids and including an elongated passage for carrying one of said liquids to a mixing chamber. Said passage includes check valve means which opens into a distribution head which in turn forms a multiplicity of lateral streams. The second fluid is introduced to the mixing compartment by way of an inlet chamber which establishes an annular flow in a direction normal to the flow of the laterally exiting streams. The combined mixture is then discharged through a progressively constricted turbulence chamber.
    Type: Grant
    Filed: June 26, 1984
    Date of Patent: October 29, 1985
    Assignee: Deutsche Texaco Aktiengesellschaft
    Inventors: Hartwig Volz, Egon Willmann
  • Process for the recovery of petroleum from subterranean formations
    Patent number: 4282930
    Abstract: An improved polymer flood process for the recovery of petroleum from a subterranean formation wherein a slug of a fresh water aqueous solution of a salt-insensitive polymer is injected into the formation prior to the undertaking of the polymer flood using a fresh water solution containing a partially hydrolyzed polyacrylamide.
    Type: Grant
    Filed: March 12, 1979
    Date of Patent: August 11, 1981
    Assignee: Deutsche Texaco Aktiengesellschaft
    Inventors: Karl-Heinz Grodde, Hartwig Volz