Aqueous gels for plugging fractures in subterranean formation an

Details Aqueous gels for plugging fractures in subterranean formation an Aqueous gels for plugging fractures in subterranean formation an

1974-07-18

1976-05-11

Lovering, Richard D.

Compositions: coating or plastic

Coating or plastic compositions

Carbohydrate or derivative containing

106194, 106197C, 252316, C08L 126

Patent

active

039559980

ABSTRACT:
Aqueous gels suitable for plugging fractures in subterranean formations are produced by (1) thickening water by incorporating therein a thickening amount of a water-soluble cellulose ether (e.g.,CMC), (2) incorporating a water-soluble compound of a polyvalent metal (e.g., sodium or potassium dichromate) wherein the valence state of the metal therein is capable of being reduced to a lower polyvalent valence state, in an amount sufficient to cause gelation when the valence of at least a portion of said metal is reduced to said lower valence state, (3) incorporating a water-soluble reducing agent (e.g., a sulfite, hydrosulfite, metabisulfite or thiosulfate of sodium or potassium, sodium sulfide, hydrogen sulfide or mixtures thereof) in an amount effective to reduce at least a portion of said metal to said lower valence state and cause gelation, and (4) incorporating a finely divided solid (e.g., diatomaceous earth) in an amount sufficient to cause an increase in gel strength.

REFERENCES:
patent: 2520805 (1950-08-01), Joy
patent: 2733156 (1956-01-01), Cornell et al.
patent: 3265657 (1966-08-01), Sinclair

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