Patent ID: 11926784
Assignee: SAUDI ARABIAN OIL COMPANY
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  E | IPC C  E

Claim 0:
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.