US 11,814,570 B2
Amide emulsifier for high-temperature oil-based drilling fluid
Evgeny Borisovich Barmatov, Cambridge (GB); and Dimitri M. Khramov, Katy, TX (US)
Assigned to SCHLUMBERGER TECHNOLOGY CORPORATION, Sugar Land, TX (US)
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
Filed on Aug. 18, 2022, as Appl. No. 17/820,684.
Claims priority of provisional application 63/260,398, filed on Aug. 19, 2021.
Prior Publication US 2023/0072831 A1, Mar. 9, 2023
Int. Cl. C09K 8/36 (2006.01); C07D 207/12 (2006.01); C07D 307/22 (2006.01)
CPC C09K 8/36 (2013.01) [C07D 207/12 (2013.01); C07D 307/22 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A wellbore fluid, comprising:
an oleaginous external phase;
a non-oleaginous internal phase; and
an emulsifier composition that includes a reaction product of i) a primary fatty amine component and ii) a capping agent selected from the group consisting of a cyclic anhydride or a diacid, wherein the reaction product comprises at least one of a first structure and a second structure, wherein the first structure includes a) a non-terminal amide group derived from an amine group of the primary fatty amine component and a carboxyl group of the capping agent and b) a terminal carboxylic acid group derived from the capping agent, and wherein the second structure includes a terminal cyclic group derived from ring closing of the non-terminal amide group and the terminal carboxylic acid group of the first structure.