Recovery system containing lanthanide-crosslinked polymers

Patent · Tue Jul 13 04:00:00 EDT 1993

OSTI ID:6428094

Dovan, H T; Hutchins, R D

A recovery system is described comprising: (a) a subterranean formation; (b) a well bore penetrating at least a portion of the subterranean formation; and (c) a composition capable of forming a gel present in at least a portion of the well bore, wherein the composition comprises: (i) a crosslinkable polymer (CP) selected from the group consisting of heteropolysaccharides obtained by the fermentation of starch-derived sugar, ammonium salts, and alkali metal salts; (ii) a lanthanide; and (iii) an ingredient selected from the group consisting of gel breakers, sequestering agents, proppants for use in hydraulically fracturing, particulate agents for forming a gravel pack, and base precursors selected from the group consisting of ammonium slats, urea, thiourea, and mixtures of these. A second recovery system is described in which the gel composition comprises: (i) a CP selected from the group consisting of acrylic acid-acrylamide copolymers, acrylic acid-methacrylamide copolymers, polyacrylamides, polymethacrylamides, partially hydrolyzed polyacrylamides, partially hydrolyzed polymethacrylamides, polyvinyl alcohol, polyvinyl acetate, polyvinyl pyrrolidone, polyalkyleneoxides, lignosulfonates, ammonium salts, alkali metal salts, and alkaline earth salts of lignosulfonates; and (ii) a crosslinking agent selected from the group consisting of lanthanides, sequestered lanthanides, and mixtures thereof. A third system is described in which the gel composition comprises: (i) a CP, hydroxyethylcellulose; and (ii) a crosslinking agent selected from the group consisting of lanthanides, sequestered lanthanides, and mixtures thereof. A fourth system is described in which the gel composition comprises: (i) a CP selected from the group consisting of polyvinyl alcohol, polyvinyl acetate, polyvinyl pyrrolidone, polyalkyleneoxides, lignosulfonates, ammonium salts, alkali metal salts, and alkaline earth salts of lignosulfonates; and (ii) a lanthanide.

• Assignee: Union Oil Co., Los Angeles, CA (United States)
• Patent Number(s): A; US 5226480
• Application Number: PPN: US 7-842238
• OSTI ID: 6428094
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ACETATES
ACRYLAMIDE
ACRYLIC ACID
ALCOHOLS
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
AMIDES
AMMONIUM COMPOUNDS
AZOLES
CARBOHYDRATES
CARBONIC ACID DERIVATIVES
CARBOXYLIC ACID SALTS
CARBOXYLIC ACIDS
CELLULOSE
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COLLOIDS
COPOLYMERS
CROSS-LINKING
DISPERSIONS
DISPLACEMENT FLUIDS
FLUIDS
FRACTURING FLUIDS
GELS
HETEROCYCLIC COMPOUNDS
HYDROXY COMPOUNDS
LACTAMS
MIXTURES
MONOCARBOXYLIC ACIDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC POLYMERS
ORGANIC SULFUR COMPOUNDS
POLYAMIDES
POLYMERIZATION
POLYMERS
POLYSACCHARIDES
PRODUCTION
PROPPING AGENTS
PYRROLES
PYRROLIDONES
RARE EARTH COMPOUNDS
SACCHARIDES
SULFONATES
UREA
WELLS