# US 10,870,788 B2 · Thermally stable surfactants for oil based drilling fluids

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- Number: US 10,870,788 B2
- Document ID: US10870788B2
- Status: Granted
- Kind: B2
- Application number: 16/100,829
- Filed: 2018-08-10
- Published: 2019-02-21
- Granted: 2020-12-22
- Earliest claimed: 2017-08-15
- Assignees: Saudi Arabian Oil Company; Durham University
- Applicants: Saudi Arabian Oil Company; Durham University
- Inventors: Mona Al Batal; Andrew Whiting; Hugh Christopher Greenwell; John Adrian Hall; Gasan Selman Alabedi
- Web page: https://patentgrep.com/patent/US10870788B2

## CPC

- C09K 8/34: Organic liquids
- C09K 8/035: Organic additives
- C09K 8/32: Non-aqueous well-drilling compositions, e.g. oil-based
- C09K 8/36: Water-in-oil emulsions
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## 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:

## Claims

### Claim 1

A surfactant of formula (I):
where
R1a is a —H, alkyl, or aryl;
x is an integer from 21 to 453;
R2 is alkyl or aryl.

### Claim 2 (depends on 1)

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

### Claim 3 (depends on 1)

The surfactant according to claim 1, where R1a is a radical —CH2—CO—NHR5 and the surfactant has a structure according to formula (II):
where: R5 is a alkyl, aryl, alkyl substituted aryl, or aryl substituted alkyl; and R2 and x are defined in formula (I).

### Claim 4 (depends on 3)

The surfactant according to claim 3, where: x is between 30 and 40; and R2 and R5 are independently a (C1-C12)hydrocarbyl chosen from the group methyl, ethyl, 1-methylethyl, propyl, n-butyl, 1,1-dimethylethyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, duodecyl.

### Claim 5 (depends on 3)

The surfactant according to claim 3, where: x is 32; R2 and R5 are both n-octyl.