Wellbore fluids including emulsifiers, and related methods

Patent metadata

Field	Value
Publication number	US-12565609-B2
Application number	US-202418800795-A
Country	US
Kind code	B2
Filing date	Aug 12, 2024
Priority date	Aug 12, 2024
Publication date	Mar 3, 2026
Grant date	Mar 3, 2026

Abstract

A wellbore fluid includes an oleaginous base fluid, and an emulsifier including a reaction product of an amide and a sultone. The amide may include a bis-amide, an imidazoline-amide, or a mixture including the bis-amide and the imidazoline-amide. The bis-amide may include a reaction product of one or more fatty acids and one or more sultones. The imidazoline-amide may include a condensation product of the bis-amide. Related methods of forming the emulsifier and using the emulsifier in a wellbore fluid while drilling an earth formation are also disclosed.

First claim

What is claimed is:

1 . A wellbore fluid, comprising:
an oleaginous base fluid; and an emulsifier including a reaction product of:
a bis-amide and a sultone; and
an imidazoline-amide and the sultone,
wherein the emulsifier includes a weight ratio of the reaction product of the bis-amide and the sultone to the reaction product of the imidazoline-amide and the sultone within a range of from about 0.1:1.0 to about 1.0:10.0.

2 . The wellbore fluid of claim 1 , wherein the sultone includes 1,3-propane sultone.

3 . The wellbore fluid of claim 1 , wherein the sultone includes 1,4-butane sultone.

4 . The wellbore fluid of claim 1 , wherein the emulsifier includes the following structure:

wherein R is a fatty acid without a hydroxyl group.

5 . The wellbore fluid of claim 1 , wherein the emulsifier includes the following structure:

wherein R is a fatty acid without a hydroxyl group.

6 . The wellbore fluid of claim 1 , wherein the bis-amide and the imidazoline-amide include a reaction product of a polyalkylamine and a fatty acid.

7 . The wellbore fluid of claim 1 , wherein the bis-amide and the imidazoline-amide include a reaction product of diethylenetriamine and a fatty acid.

8 . The wellbore fluid of claim 7 , wherein the fatty acid includes one or more of oleic acid, linoleic acid, palmitic acid, and stearic acid.

9 . A method of drilling a borehole, the method comprising:
drilling a borehole in an earth formation using a drilling fluid comprising:
an oleaginous base fluid; and
an emulsifier including a reaction product of:
a bis-amide and a sultone; and
an imidazoline-amide and the sultone; and

circulating the drilling fluid through the borehole, wherein the emulsifier includes a weight ratio of the reaction product of the bis-amide and the sultone to the reaction product of the imidazoline-amide and the sultone within a range of from about 0.1:1.0 to about 1.0:10.0.

10 . The method of claim 9 , wherein the sultone includes 1,3-propane sultone.

11 . The method of claim 9 , wherein the sultone includes 1,4-butane sultone.

Assignees

• Schlumberger Technology Corp

Inventors

• Khramov Dimitri
• Barmatov Evgeny

Classifications

• C07C309/15

  the nitrogen atom of at least one of the amino groups being part of any of the groups [IMAGE cpc-sch-C07C-0975.gif], X being a hetero atom, Y being any atom · CPC title

• C07D233/26 Primary

  Radicals substituted by carbon atoms having three bonds to hetero atoms · 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

• C09K8/36 Primary

  Water-in-oil emulsions · CPC title

• C09K8/035

  Organic additives · CPC title