Patent ID: 11873444
Assignee: SOUTHWEST PETROLEUM UNIVERSITY
Field: Materials, metallurgy (Chemistry)
Classification: CPC C | IPC C

Claim 10:
11. The oil-based drilling fluid of claim 9, wherein the base oil is selected from white oil and/or diesel oil;
and/or, the organic clay is an oleophilic clay produced from an interaction of a hydrophilic bentonite with an alkyl quaternary ammonium salt cationic surfactant, and/or, the emulsifier comprises a primary emulsifier and a secondary emulsifier;
wherein the primary emulsifier is selected from the group consisting of calcium naphthenate, oleic acid, a naphthenic acid amide, and a combination thereof, and the secondary emulsifier is a Span series emulsifier and/or calcium alkylbenzenesulfonate;
and/or, the wetting agent is a fatty acid derivative;
and/or, the filtrate reducer is selected from the group consisting of sodium carboxymethyl cellulose, humic acid, lignite lye, and a combination thereof;
and/or, the weighting agent is selected from the group consisting of API barite, ultrafine barium sulfate, magnetite powder, ilmenite powder, trimanganese tetroxide and a combination thereof.