Thermally stable surfactants for oil based drilling fluids

Patent metadata

Field	Value
Publication number	US-10870788-B2
Application number	US-201816100829-A
Country	US
Kind code	B2
Filing date	Aug 10, 2018
Priority date	Aug 15, 2017
Publication date	Dec 22, 2020
Grant date	Dec 22, 2020

Abstract

Embodiments are directed to a surfactant of formula (I) and incorporation of one or more surfactants into drilling fluids. The surfactant having the following structure:

First claim

We claim:

1. A surfactant of formula (I):

where
R 1a is a —H, alkyl, or aryl;
x is an integer from 21 to 453;
R 2 is alkyl or aryl.

2. The surfactant according to claim 1 , where x is selected from 30 to 100.

3. The surfactant according to claim 1 , where R 1a is a radical —CH 2 —CO—NHR 5 and the surfactant has a structure according to formula (II):

where: R 5 is a alkyl, aryl, alkyl substituted aryl, or aryl substituted alkyl; and R 2 and x are defined in formula (I).

4. The surfactant according to claim 3 , where: x is between 30 and 40; and R 2 and R 5 are independently a (C 1 -C 12 )hydrocarbyl chosen from the group methyl, ethyl, 1-methylethyl, propyl, n-butyl, 1,1-dimethylethyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, duodecyl.

5. The surfactant according to claim 3 , where: x is 32; R 2 and R 5 are both n-octyl.

Assignees

• Saudi Arabian Oil Co
• Univ Durham

Inventors

• Al Batal Mona
• Whiting Andrew
• Greenwell Hugh Christopher
• Hall John Adrian
• Alabedi Gasan Selman

Classifications

• C09K2208/30

  Viscoelastic surfactants [VES] · CPC title

• C09K8/36

  Water-in-oil emulsions · CPC title

• C09K8/34 Primary

  Organic liquids · CPC title

• C09K8/32

  Non-aqueous well-drilling compositions, e.g. oil-based · CPC title

• C09K8/035 Primary

  Organic additives · CPC title