CPC C09K 8/145 (2013.01) [C09K 8/16 (2013.01); E21B 7/00 (2013.01)] | 17 Claims |
1. A drilling fluid comprising:
an aqueous solution;
a clay-based component comprising layered silicate;
a viscosifier additive comprising poly(acrylamide-co-diallyldimethylammonium chloride) (poly(AAm-co-DMAC)) polymer, where the polymer comprises a number average molecular weight of from 100,000 g/mol to 2,000,000 g/mol;
wherein the layered silicate and poly(AAm-co-DMAC) reacts to form a silicate-poly(AAm-co-DMA) complex within the aqueous solution; and
wherein a mass ratio of the poly(AAm-co-DMAC) to the layered silicate is 1 to 8.
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