Subterranean formation treating with delayed crosslinking...

Details Subterranean formation treating with delayed crosslinking... Subterranean formation treating with delayed crosslinking...

E - Fixed Constructions

21

B

31/26

E21B 43/26 (2006.01) C09K 8/512 (2006.01) C09K 8/68 (2006.01) E21B 33/138 (2006.01)

Patent

CA 1301446

Abstract of the Disclosure A method of treating a subterranean formation with delayed crosslinking gel fluids is provided. An aqueous gel is first prepared by admixing an organic carboxylated gelling agent with an aqueous liquid. A buffer is combined with the aqueous gel in an amount sufficient to result in and maintain the pH thereof at a level of about 5 or above at ambient temperature. A zirconium IV-containing cross- linking compound is combined with the gel and the mixture is introduced into a subterranean formation whereby the mixture is heated and caused to crosslink.

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