US 11,926,784 B2
Simultaneous association-dissociation of layered silicates on polymers to improve rheology of drilling fluids
Hasmukh A. Patel, Houston, TX (US); and Carl Thaemlitz, Houston, TX (US)
Assigned to Saudi Arabian Oil Company, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on Jul. 1, 2022, as Appl. No. 17/856,373.
Prior Publication US 2024/0002716 A1, Jan. 4, 2024
Int. Cl. C09K 8/14 (2006.01); C09K 8/16 (2006.01); E21B 7/00 (2006.01)
CPC C09K 8/145 (2013.01) [C09K 8/16 (2013.01); E21B 7/00 (2013.01)] 17 Claims
OG exemplary drawing
 
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.