Title: Process for fracturing well formations using aqueous gels

Abstract: A method and composition for fracturing a subterranean formation which comprises (1) contacting a subterranean formation with an aqueous liquid comprising a propping agent and a composition containing water, acrylamide:methacrylate copolymer cross-linked with chromium (III) ion, in presence of carbonate ion, oxalate ion, and, optionally, persulfate ion, (2) applying pressure to said liquid, (3) maintaining said pressure to fracture said formation, (4) and said gel breaking within 24 hours of gel formation.

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Inventors: Golinkin, Herbert S. (Naperville, IL, US)

Application Number: 807969
Filing Date: 1977-06-20
Publication_date: 1979-01-30
Assignee: Standard Oil Company (Indiana) (Chicago, IL)
Primary Class(es): 507/225 166/283, 166/295, 166/308.5, 507/204, 507/267, 507/922, 507/924, 524/15, 524/424, 524/428, 524/441
Other Classes:
US Patent Ref:

3114651	Dec, 1963	Gentile	428/264.
3727689	Apr, 1973	Clampitt	166/283.
3816151	Jun, 1974	Podlas	252/8.
3938594	Feb, 1976	Rhudy et al.	252/8.
4021355	May, 1977	Holtmyer et al.	252/8.

Other Refs:
Primary Examiner: Guynn, Herbert B.
Assistant Examiner:
Attorney: Clarke; William C., Gilkes; Arthur G., McClain; William T.