US 12,325,821 B2
Lubricant blends and methods for improving lubricity of brine-based drilling fluids
Matthew Taylor, Calgary (CA); Stuart Dubberley, Calgary (CA); Jay Nelson Brockhoff, Calgary (CA); and Kuangbiao Ma, Calgary (CA)
Assigned to SECURE SPECIALTY CHEMICALS CORP., Calgary (CA)
Filed by Secure Specialty Chemicals Corp., Calgary (CA)
Filed on Jul. 12, 2023, as Appl. No. 18/351,448.
Claims priority of provisional application 63/388,519, filed on Jul. 12, 2022.
Claims priority of provisional application 63/521,583, filed on Jun. 16, 2023.
Prior Publication US 2024/0026204 A1, Jan. 25, 2024
Int. Cl. C09K 8/08 (2006.01)
CPC C09K 8/08 (2013.01) [C09K 2208/34 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A method for increasing the lubricity of a brine-based drilling fluid having an alkaline pH, the method comprising:
providing a produced water or a brine having a threshold divalent cation concentration and an alkaline pH;
adding to the produced water or brine at least one source of free fatty acids; and
adding to the produced water or brine a dispersant, wherein the dispersant comprises an imidazoline.