High density and high temperature emulsifier for use in an oil based drilling fluid system

US9909050B2 · kind B2 · utility

Assignee

• CNPC USA Corporation · US

Inventors

• Chun Zhou · Sugar Land, US
• Fuchen Liu · Panjin City, CN
• Zhenzhou Yang · Beijing, CN

Key dates

• Filing date: Oct 14, 2015
• Grant date: Mar 6, 2018
• Expiry date: Dec 31, 2035

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K8/035
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

An emulsifying composition for an oil based drilling fluid includes oleyl alcohol and a mixture of polymeric amides. The polymeric amides can be 1,3-dihydroxypropan-2-yl (E)-12-hydroxyoctadec-9-enoate, (9E,9′E)-N,N′-(azanediylbis(ethane-2,1-diyl))bis(12-hydroxyoctadec-9-enamide, (E)-12-hydroxy-N,N-bis(2-((E)-12-hydroxyoctadec-9-enamido(ethyl)octadec-9-enamide, (Z)-4-(bis(2-((E)-12-hydroxyoctadec-9-enamido)ethy)amino)-4-oxobut-2-enoic acid, 1,3-dihydroxypropan-2-yl(Z)-4-(bis(2-((E)-12-hydroxyoctadec-9-enamido)ethy)amino)-4-oxobut-2-enoate, and N1,N1,N4,N4-tetrakis(2-((E)-12-hydroxyoctadec-9-enamido)ethyl)maleamide. The method of forming the emulsifying composition includes reacting a fatty oil with diethylenetriamine and then maleic acid, and adding oleyl alcohol. The high density emulsifying composition is stable at high temperatures of drilling operations at greater depths in the wellbore.