Patents Assigned to Eniricerche S.p.A. and AGIP S.p.A.
  • Gellable aqueous composition and its use in enhanced petroleum
    Patent number: 5143958
    Abstract: The permeability of high-permeability zones in a oil reservoir can be reduced by using a gellable aqueous composition with delayed gelation.The composition comprises:a) water;b) a high-molecular weight natural or synthetic water-soluble polymer cross-linkable by means of Cr.sup.3+ ions;c) a water-soluble inorganic Cr.sup.
    Type: Grant
    Filed: March 27, 1990
    Date of Patent: September 1, 1992
    Assignee: Eniricerche S.p.A. and Agip S.p.A.
    Inventors: Thomas P. Lockhart, Giovanni Burrafato
  • Polymers and copolymers containing malonic (meth)acrylamide units
    Patent number: 5089577
    Abstract: New homopolymers formed by malonic (meth)acrylamide monomer units according to the following formula: ##STR1## wherein R is H or CH.sub.3 ; X is H or an alkaline metal or NH.sub.4.sup.+ ; and copolymers formed by (meth)acrylamide monomer units (I) and monomer units (II).
    Type: Grant
    Filed: December 18, 1990
    Date of Patent: February 18, 1992
    Assignee: Eniricerche S.p.A. and AGIP S.p.A.
    Inventors: Fabrizio Bonaccorsi, Rosario Pappa, Mario Riocci, Arnaldo Roggero, Thomas P. Lockhart