Compositions and methods for reducing the permeability of...

Details Compositions and methods for reducing the permeability of... Compositions and methods for reducing the permeability of...

E - Fixed Constructions

21

B

31/17

E21B 43/22 (2006.01) C09K 8/508 (2006.01) C09K 8/90 (2006.01)

Patent

CA 1231837

COMPOSITIONS AND METHODS FOR REDUCING THE PERMEABILITY OF UNDERGROUND STRATA Abstract of the Disclosure Compositions and methods are used for reducing the permeability of high fluid permeability segments of under- ground strata, the compositions being injected into the high permeability segments in liquid form and there gelled to reduce the permeability of the segments. A first group of compositions has a pH of at least 4 and comprises a sulfited derivative of a tannin extract together with furfural, formaldehyde or a formaldehyde derivative. The second group of compositions comprises furfural and a gellable vegetable material which can be a tannin extract, a sulfited deriv- ative of a tannin extract, a catechin, an alkaline extract of a coniferous bark or a lignin or sulfonated lignin derivative.

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