Abstract: A dry polymer powder for use in enhanced petroleum recovery without being prehydrated before being added to water or brine to be introduced into a wellhead. The dry polymer powder consisting of at least one of a polyacrylamide, a copolymer of acrylamide and acrylic acid, a galactomannan, or cellulosic polymer or derivatives thereof, and the polymer can be crosslinked or not crosslinked, provided that if they are homo- or co-polymers of acrylic acid, they are not crosslinked. The dry polymer powder has a polymer size range distribution of 6.6%<40 mesh and 85.4% of 40 to 200 mesh and 8%>200 mesh, and wherein the polymer size range ensures that the dry polymer powder will efficiently hydrate in the water or brine within about one minute without forming fisheyes.

Abstract: A dry polymer powder for use in enhanced petroleum recovery without being prehydrated before being added to water or brine to be introduced into a wellhead. The dry polymer powder consisting of at least one of a polyacrylamide, a copolymer of acrylamide and acrylic acid, a galactomannan, or cellulosic polymer or derivatives thereof, and the polymer can be crosslinked or not crosslinked, provided that if they are homo- or co-polymers of acrylic acid, they are not crosslinked. The dry polymer powder has a polymer size range distribution of 6.6%<40 mesh and 85.4% of 40 to 200 mesh and 8%>200 mesh, and wherein the polymer size range ensures that the dry polymer powder will efficiently hydrate in the water or brine within about one minute without forming fisheyes.

Abstract: A composition suitable as an additive in down-hole fluid for inhibiting clay swelling in a down-hole formation is comprised of an aqueous solution of a quaternary amine-based cationic polyelectrolyte and salt(s). The cation of the salt(s) may be a divalent salt cation, a choline cation, are certain N-substituted quaternary ammonium salt cations. The salt(s) anion may be a monovalent inorganic anion or an anion derived from an organic acid having from 2 to 6 carbons.

Abstract: A clay swelling inhibitor additive for oil and gas well treatment is disclosed. The additive comprises an aqueous solution of tetraalkylammonium chloride, preferably tetramethylammonium chloride and a quaternary amine-based cationic polyelectrolyte, such as methyl chloride quaternary salt of ethylene-ammonia condensation polymer. The additive composition synergistically retards water absorption by the down-hole clay formation.

Abstract: A clay swelling inhibitor additive for oil and gas well treatment is disclosed. The additive comprises an aqueous solution of tetraalkylammonium chloride, preferably tetramethylammonium chloride and a quaternary amine-based cationic polyelectrolyte, such as methyl chloride quaternary salt of ethylene-ammonia condensation polymer. The additive composition synergistically retards water absorption by the down-hole clay formation.