	US 12,065,608 B2
	Synthesis and use of grafted graphene in oil based drilling fluids as low shear rate viscosity enhancer
Ashok Santra, The Woodlands, TX (US); and Carl J. Thaemlitz, Cypress, TX (US)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by ARAMCO SERVICES COMPANY, Houston, TX (US)
Filed on Jan. 7, 2022, as Appl. No. 17/647,428.
Prior Publication US 2023/0220265 A1, Jul. 13, 2023
Int. Cl. C09K 8/34 (2006.01); C08F 292/00 (2006.01)

CPC C09K 8/34 (2013.01) [C08F 292/00 (2013.01); C09K 2208/34 (2013.01)]

5 Claims

1. A composition of matter comprising:

a polymer-grafted graphene particle, wherein at least one side of the graphene particle comprises a grafted polymer; and

oil-based drilling fluid,

wherein

the grafted-polymer is polymerized from monomer units consisting of a first monomer type that is 2-acrylamido-2-methylpropane sulfonic acid and a second monomer type that is lauryl acrylate, and

the composition comprises a range of from 1 pounds per barrel to 10 pounds per barrel of the polymer-grafted graphene particle.