# US 2008/0188382 A1 · Compositions for Drilling Fluids Useful to Provide Flat Temperature Rheology to Such Fluids Over a Wide Temperature Range, and Drilling Fluids Containing Such Compositions

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- Number: US 2008/0188382 A1
- Document ID: US20080188382A1
- Status: Published application
- Kind: A1
- Application number: 11/963,182
- Filed: 2007-12-21
- Published: 2008-08-07
- Earliest claimed: 2002-11-27
- Assignees: Elementis Specialties, Inc.
- Inventors: Jeffrey Thompson; David Dino; Richard Jobbins; Mark Matyi
- Web page: https://patentgrep.com/patent/US20080188382A1

## CPC

- C08G 69/34: using polymerised unsaturated fatty acids
- C09K 8/32: Non-aqueous well-drilling compositions, e.g. oil-based
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## Abstract

The invention is of oil-based drilling fluids including invert emulsion fluids that are able to maintain a relatively consistent rheological profile over a wide temperature range. The invention also includes new additives that enable the preparation of drilling fluids with viscosities that are less affected by temperature over a temperature range from less than about 40° F. to more than about 250° F. compared to conventional fluids. These additives are based on reaction products of polyamines and carboxylic acids with two or more carboxylic moieties combined with alkoxylated amines and fatty acid amides. In addition, this invention permits the use of reduced amounts of organoclay rheological additives in drilling fluids.

## Claims

### Claim 1

A composition comprising:
a) the reaction product of (i) a carboxylic acid with at least two carboxylic moieties and (ii) a polyamine having an amine functionality of two or more; and
b) a chemical selected from the group consisting of (i) alkoxylated alkyl amines, (ii) fatty acid amides and (iii) mixtures thereof.

### Claim 2 (depends on 1)

The composition of claim 1, wherein the carboxylic acid is a dimer fatty acid.

### Claim 3 (depends on 2)

The composition of claim 2, wherein the dimer fatty acid is selected from the group consisting of hydrogenated, partially hydrogenated and non-hydrogenated dimer acids with from about 20 to about 48 carbon atoms.

### Claim 4 (depends on 1)

The composition of claim 1, wherein the polyamine is a polyethylene polyamine.

### Claim 5 (depends on 4)

The composition of claim 4, wherein the polyamine is selected from the group consisting of ethylenediamine, diethylenetriamine, triethylenetetramine and tetraethylenepentamine.

### Claim 6 (depends on 4)

The composition of claim 4, wherein the polyamine is diethylenetriamine.

### Claim 7 (depends on 1)

The composition of claim 1, wherein the alkoxylated alkyl amine is an ethoxylated fatty amine.

### Claim 8 (depends on 7)

The composition of claim 7, wherein the elkoxylated fatty amine is an ethoxylated (5) cocoalkyl amine.

### Claim 9 (depends on 1)

The composition of claim 1, further comprising an organoclay.

### Claim 10 (depends on 1)

An oil based drilling fluid comprising the composition of claim 1.

### Claim 11 (depends on 10)

The drilling fluid of claim 10, further comprising an organoclay.

### Claim 12 (depends on 10)

The drilling fluid of claim 10, further comprising one or more emulsifiers.

### Claim 13

A composition comprising the reaction product of (a) a polyamine having an amine functionality of two or more, (b) a carboxylic acid with at least two carboxylic moieties and (c) an alkoxylated alkyl amine.

### Claim 14 (depends on 13)

An oil based drilling fluid comprising the reaction product of claim 13.

### Claim 15

A composition comprising the reaction product of a) a carboxylic acid with at least two carboxylic moieties, b) a polyamine having an amine functionality of two or more, c) an alkoxylated alkyl amine and d) a fatty acid amide.

### Claim 16 (depends on 15)

An oil-based drilling fluid comprising the composition of claim 15.

### Claim 17 (depends on 16)

The drilling fluid of claim 16 further comprising an organoclay.

### Claim 18 (depends on 15)

The drilling fluid of claim 15, further comprising one or more emulsifiers.

### Claim 19

A composition comprising:
a) the reaction product of (i) a carboxylic acid with at least two carboxylic moieties, (ii) a polyamine having an amine functionality of two or more and (iii) an alkoxylated alkyl amine; and
b) a fatty acid amide.

### Claim 20 (depends on 19)

An oil based drilling fluid comprising the composition of claim 19.

### Claim 21 (depends on 20)

The drilling fluid of claim 20 further comprising an organoclay.