Storable gas generating compositions

Patent metadata

Field	Value
Publication number	US-10934468-B2
Application number	US-202016807595-A
Country	US
Kind code	B2
Filing date	Mar 3, 2020
Priority date	Feb 21, 2019
Publication date	Mar 2, 2021
Grant date	Mar 2, 2021

Abstract

The present application provides an aqueous fluid containing a gas-generating compound such as an azo compound, a hydrazide compound, or a semicarbazide compound. The aqueous fluid may also contain an amine compound, an oxidizer, or viscosifier, and a foaming surfactant. The aqueous composition may be storable at pH of less than about 5 without any appreciable gas generation, and may be activated to produce gas when mixed with a wellbore fluid for use in downhole applications.

First claim

What is claimed is:

1. An aqueous gas-generating composition comprising an azo compound of Formula (I):

or a salt thereof, wherein:
X 1 and X 2 are each independently selected from the group consisting of C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, OR a1 , and NR c1 R d1 ;
each R a1 , R c1 and R d1 is independently selected from the group consisting of H, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 3-7 cycloalkyl, and C 6-10 aryl; and
an acid to adjust the pH to less than about 5, and wherein the composition is stable and storable without producing any substantial amount of gas for at least 24 hours.

2. The aqueous gas-generating composition of claim 1 , wherein:
X 1 and X 2 are each independently selected from the group consisting of OR a1 and NR c1 R d1 ; and
each R a1 , R c1 and R d1 is independently selected from the group consisting of H and C 1-6 alkyl.

3. The aqueous gas-generating composition of claim 2 , wherein the azo compound is azodicarbonamide, or a salt thereof.

4. The aqueous gas-generating composition of claim 1 , wherein pH of the composition is less than about 4.

5. The aqueous gas-generating composition of claim 1 , wherein an amount of the azo compound in the aqueous composition is from about 1 wt. % to about 10 wt. %.

6. The aqueous gas-generating composition of claim 1 , comprising an amine compound which is a primary, secondary or tertiary amine of Formula (IVa):

or a salt thereof, wherein:
R n1 , R n2 and R n3 are independently selected from the group consisting of H, C 1-6 alkyl, C 3-7 cycloalkyl, and 4-7 membered heterocycloalkyl, each of which is optionally substituted with 1, 2, or 3 substituents independently selected from the group consisting of hydroxyl, C 1-6 alkoxy, amino, C 1-6 alkylamino, di(C 1-6 alkyl)amino, carboxy, and carbamyl; or
any R n1 and R n2 , or any R n2 and R n3 , or any R n1 and R n3 together with the N atom to which they are attached form a 4-7 membered heterocycloalkyl, which is optionally substituted with 1, 2, 3, 4, or 5 substituents independently selected from the group consisting of C 1-6 alkyl, NH 2 —C 1-6 alkylene, OH—C 1-6 alkylene, hydroxyl, C 1-6 alkoxy, amino, C 1-6 alkylamino, di(C 1-6 alkyl)amino, carboxy, and carbamyl.

7. The aqueous gas-generating composition of claim 6 , wherein:
R n1 , R n2 and R n3 are independently selected from the group consisting of H and C 1-6 alkyl, which is optionally substituted with 1, 2, or 3 substituents independently selected from the group consisting of hydroxyl, C 1-6 alkoxy, amino, C 1-6 alkylamino, di(C 1-6 alkyl)amino, and carboxy.

8. The aqueous gas-generating composition of claim 7 , wherein the amine compound is triethanolamine, or a salt thereof.

9. The aqueous gas-generating composition of claim 1 , comprising an amine compound which is a hydrazine compound of Formula (IVb):

or a salt thereof, wherein:
R n4 , R n5 , R n6 , and R n7 are independently selected from the group consisting of H, C 1-6 alkyl, C 3-7 cycloalkyl, and 4-7 membered heterocycloalkyl, each of which is optionally substituted with 1, 2, or 3 substituents independently selected from the group consisting of hydroxyl, C 1-6 alkoxy, amino, C 1-6 alkylamino, di(C 1-6 alkyl)amino, carboxy, and carbamyl; or

any R n4 and R n5 , or any R n6 and R n7 , together with the N atom to which they are attached form a 4-7 membered heterocycloalkyl, which is optionally substituted with 1, 2, 3, 4, or 5 substituents independently selected from the group consisting of C 1-6 alkyl, hydroxyl, C 1-6 alkoxy, amino, C 1-6 alkylamino, di(C 1-6 alkyl)amino, carboxy, and carbamyl.

10. The aqueous gas-generating composition of claim 9 , wherein
R n4 , R n5 , R n6 , and R n7 are independently selected from the group consisting of H and C 1-6 alkyl, which is optionally substituted with 1, 2, or 3 substituents independently selected from the group consisting of hydroxyl, C 1-6 alkoxy, amino, C 1-6 alkylamino, di(C 1-6 alkyl)amino, and carboxy.

11. The aqueous gas-generating composition of claim 10 , wherein the hydrazine compound is selected from the group consisting of hydrazine, hydrazine monohydrobromide, hydrazine hydrate, hydrazine sulfate, hydrazine acetate, hydrazine dihydrochloride, hydrazine monohydrochloride, and hydrazine acetate.

12. The aqueous gas-generating composition of claim 1 , comprising an amine compound which is an ethyleneimine compound of Formula (IVc):

or a salt thereof, wherein:
n is an integer from 1 to 10,
R n8 , R n9 , R n10 , and R n11 are independently selected from the group consisting of H, C 1-6 alkyl, C 3-7 cycloalkyl, and 4-7 membered heterocycloalkyl, each of which is optionally substituted with 1, 2, or 3 substituents independently selected from the group consisting of hydroxyl, C 1-6 alkoxy, amino, C 1-6 alkylamino, di(C 1-6 alkyl)amino, carboxy, and carbamyl; or
any R n8 and R n9 , or any R n10 and R n11 , together with the N atom to which they are attached form a 4-7 membered heterocycloalkyl, which is optionally substituted with 1, 2, 3, 4, or 5 substituents independently selected from the group consisting of C 1-6 alkyl, NH 2 —C 1-6 alkylene, OH—C 1-6 alkylene, hydroxyl, C 1-6 alkoxy, amino, C 1-6 alkylamino, di(C 1-6 alkyl)amino, carboxy, and carbamyl.

13. The aqueous gas-generating composition of claim 12 , wherein
n is an integer from 1 to 8, and R n8 , R n9 , R n10 , and R n11 are independently selected from the group consisting of H and C 1-6 alkyl, which is optionally substituted with 1, 2, or 3 substituents independently selected from the group consisting of amino, C 1-6 alkylamino, di(C 1-6 alkyl)amino, carboxy, and carbamyl.

14. The aqueous gas-generating composition of claim 13 , wherein the ethyleneimine compound is selected from the group consisting of ethylene diamine (EDA), tetraethylene pentamine (TEPA), diethyletriamine (DETA), polyethyleneimine, and a salt thereof.

15. The aqueous gas-generating composition of claim 1 , comprising an amine compound which is a hydrazide compound of Formula (IIa) or Formula (IIb):

or a salt thereof, wherein:
R 1 is selected from the group consisting of H, C 1-6 alkyl, C 6-10 aryl, and —NH—NH 2 , wherein said C 6-10 aryl is optionally substituted with 1, 2, or 3 substituents independently selected from the group consisting of C 1-6 alkyl, hydroxyl, amino, C 1-6 alkoxy, and NO 2 ; and
R 2 is selected from the group consisting of H, C 1-6 alkyl, carboxy, carbamyl, C 1-6 alkylcarbamyl, di(C 1-6 alkyl)carbamyl, aminosulfonyl, C 1-6 alkylaminosulfonyl, and di(C 1-6 alkyl)aminosulfonyl.

16. The aqueous gas-generating composition of claim 15 , wherein:
R 1 is selected from the group consisting of C 6-10 aryl and —NH—NH 2 , wherein said C 6-10 aryl is optionally substituted with 1, 2, or 3 substituents independently selected from the group consisting of C 1-6 alkyl and NO 2 ; and
R 2 is selected from the group consisting of H, carboxy, carbamyl, and aminosulfonyl.

Assignees

• Saudi Arabian Oil Co

Inventors

• Reddy B Raghava

Classifications

• C09K8/38 Primary

  Gaseous or foamed well-drilling compositions · CPC title

• C09K8/94

  Foams · CPC title

• C09K8/473

  Density reducing additives, e.g. for obtaining foamed cement compositions · CPC title

• C09K8/703

  Foams · CPC title

• C04B28/02

  containing hydraulic cements other than calcium sulfates · CPC title