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

Patent metadata

Field	Value
Publication number	US-9909050-B2
Application number	US-201514883388-A
Country	US
Kind code	B2
Filing date	Oct 14, 2015
Priority date	Oct 14, 2015
Publication date	Mar 6, 2018
Grant date	Mar 6, 2018

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 N 1 ,N 1 ,N 4 ,N 4 -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.

First claim

We claim:

1. An emulsifying composition for an oil based drilling fluid, comprising:
oleyl alcohol;
1,3-dihydroxypropan-2-yl (E)-12-hydroxyoctadec-9-enoate as Compound A;
(9E,9′E)-N,N′-(azanediylbis(ethane-2,1-diyl))bis(12-hydroxyoctadec-9-enamide as Compound B;
(E)-12-hydroxy-N,N-bis(2-((E)-12-hydroxyoctadec-9-enamido(ethyl)octadec-9-enamide as Compound C;
(Z)-4-(bis(2-((E)-12-hydroxyoctadec-9-enamido)ethy)amino)-4-oxobut-2-enoic acid as Compound D;
1,3-dihydroxypropan-2-yl(Z)-4-(bis(2-((E)-12-hydroxyoctadec-9-enamido)ethy)amino)-4-oxobut-2-enoate as Compound E; and
N 1 ,N 1 ,N 4 ,N 4 -tetrakis(2-((E)-12-hydroxyoctadec-9-enamido)ethyl)maleamide as Compound F;
wherein said oleyl alcohol is 10-50% by weight, said Compound A is 10-50% by weight, and
wherein said Compound B is 5-30% by weight.

2. The emulsifying composition, according to claim 1 , wherein each of said Compound C, said Compound D, said Compound E, and said Compound F is 5-40% by weight.

3. An emulsifying composition for an oil based drilling fluid, comprising:
oleyl alcohol;
1,3-dihydroxypropan-2-yl (E)-12-hydroxyoctadec-9-enoate as Compound A;
(9E,9′E)-N,N′-(azanediylbis(ethane-2,1-diyl))bis(12-hydroxyoctadec-9-enamide as Compound B;
(E)-12-hydroxy-N,N-bis(2-((E)-12-hydroxyoctadec-9-enamido(ethyl)octadec-9-enamide as Compound C;
(Z)-4-(bis(2-((E)-12-hydroxyoctadec-9-enamido)ethy)amino)-4-oxobut-2-enoic acid as Compound D;
1,3-dihydroxypropan-2-yl(Z)-4-(bis(2-((E)-12-hydroxyoctadec-9-enamido)ethy)amino)-4-oxobut-2-enoate as Compound E; and
N 1 ,N 1 ,N 4 ,N 4 -tetrakis(2-((E)-12-hydroxyoctadec-9-enamido)ethyl)maleamide as Compound F;

wherein said oleyl alcohol is 20-30% by weight,
wherein said Compound A is 10-30% by weight, and
wherein said Compound B is 10-20% by weight.

4. The emulsifying composition, according to claim 2 , wherein each of said Compound C, said Compound D, and said Compound E is 5-10% by weight, and
wherein said Compound F is 5-20% by weight.

5. An oil based drilling fluid system, comprising:
a base oil;
viscosifier;
lime;
weighting agent;
a fluid loss additive; and
an emulsifier, according to claim 1 so as to form an inverted emulsion oil based drilling fluid.

6. The oil based drilling fluid system, according to claim 5 , wherein said base oil is 50-100% by weight,
wherein said viscosifier is 1-5% by weight,
wherein said lime is 1-5% by weight,
wherein said weighting agent is 20-70% by weight,
wherein said fluid loss additive is 5-10% by weight, and
wherein said emulsifier is 0.3-3% by weight.

7. The oil based drilling fluid system, according to claim 5 , wherein said emulsifier is produced by reactions of a hydroxyl-fatty oil with diethylenetriamine and then maleic acid.

Assignees

• Cnpc Usa Corp
• Cnpc Usa Corp

Inventors

• Zhou Chun
• Liu Fuchen
• Yang Zhenzhou

Classifications

• C09K8/035

  Organic additives · CPC title

• C09K8/36 Primary

  Water-in-oil emulsions · CPC title

• E21B21/00

  Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor (freeing objects stuck in boreholes by flushing E21B31/03) · CPC title