Maleic anhydride polymers and methods of treating subterranean formations

Patent metadata

Field	Value
Publication number	US-10160902-B2
Application number	US-201615263895-A
Country	US
Kind code	B2
Filing date	Sep 13, 2016
Priority date	Sep 14, 2015
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

Abstract

This document relates to compositions including a maleic anhydride copolymer or a salt thereof and an amine crosslinker. The maleic anhydride copolymer includes repeat units I and II:

Each R 1 is independently selected from the group consisting of —H, —O(C 1 -C 5 )alkyl, and —(C 1 -C 5 )alkyl. Each R 2 is independently selected from the group consisting of —H, —O(C 1 -C 5 )alkyl, and —(C 1 -C 5 )alkyl. The maleic anhydride copolymer further includes at least one hydrolyzed repeat unit selected from repeat units III and IV:

First claim

What is claimed is:

1. A composition comprising:
a water-soluble maleic anhydride copolymer comprising:
repeat units I and II:

wherein the maleic anhydride copolymer is an alternating copolymer, with alternating repeat units I and II, each R 1 is independently selected from the group consisting of —H, —O(C 1 -C 5 )alkyl, and (C 1 -C 5 )alkyl, and each R 2 is independently selected from the group consisting of —H, —O(C 1 -C 5 )alkyl, and —(C 1 -C 5 )alkyl; and
at least one hydrolyzed repeat unit selected from repeat units III and IV:

or a salt thereof;
an amine crosslinker;
an aqueous carrier, and
a salt from about 1% to about 10% by weight of the composition,
wherein when the composition is crosslinked, the composition forms a sealant in the form of a gel, and
wherein an amount of the maleic anhydride copolymer and amine crosslinker is about 5% to about 10% by weight of the composition.

2. The composition of claim 1 , wherein the at least one hydrolyzed repeat unit comprises repeat unit III.

3. The composition of claim 2 , wherein the ratio of repeat unit III to repeat unit II is about 1:10 to about 10:1.

4. The composition of claim 1 , wherein the at least one hydrolyzed repeat unit comprises repeat unit IV.

5. The composition of claim 4 , wherein the ratio of repeat unit IV to repeat unit II is about 1:10 to about 10:1.

6. The composition of claim 1 , wherein the at least one hydrolyzed repeat unit comprises at least two hydrolyzed repeat units, and the at least two hydrolyzed repeat units comprise repeat unit III and repeat unit IV.

7. The composition of claim 6 , wherein the ratio of repeat unit III to repeat unit II is about 1:10 to about 10:1, and the ratio of repeat unit IV to repeat unit II is about 1:10 to about 10:1.

8. The composition of claim 1 , wherein
each R 1 is independently selected from the group consisting of —H, —OCH 3 , and —CH 3 , and
each R 2 is independently selected from the group consisting of —H, —OCH 3 , and —CH 3 .

9. The composition of claim 8 , wherein
each R 1 is H, and
each R 2 is independently selected from the group consisting of —H, —OCH 3 , and —CH 3 .

10. The composition of claim 9 , wherein repeat unit I is selected from the group consisting of:

and combinations thereof.

11. The composition of claim 1 , wherein the amine crosslinker is selected from the group consisting of a polyalkyleneimine, a polyetheramine, a polyalkylenepolyamine, an aliphatic amine, a polyfunctional aliphatic amine, an arylalkylamine, a heteroarylalkylamine, a chitosan, and combinations thereof.

12. The composition of claim 1 , wherein the salt is selected from NaCl, NaBr, KCl, KBr, CaCl 2 , MgCl 2 , NaNO 3 , KNO 3 , NaC 2 H 3 O 2 , KC 2 H 3 O 2 , NaCHO 2 , KCHO 2 , and combinations thereof.

13. The composition of claim 1 , wherein the salt is NaCl or KCl.

14. The composition of claim 1 , wherein the amount of the salt is 2%, 4%, 4.5%, 7%, or 8% based on the weight of the composition.

15. The composition of claim 1 , wherein:
the at least one hydrolyzed repeat unit comprises repeat unit III;
the ratio of repeat unit III to repeat unit II is about 1:10 to about 10:1;
each R′ is independently selected from the group consisting of —H, —OCH 3 , and —CH 3 , and
each R 2 is independently selected from the group consisting of —H, —OCH 3 , and —CH 3 ;
the amine crosslinker is selected from the group consisting of a polyalkyleneimine, a polyetheramine, a polyalkylenepolyamine, an aliphatic amine, a polyfunctional aliphatic amine, an arylalkylamine, a heteroarylalkylamine, a chitosan, and combinations thereof; and
the salt is selected from NaCl, NaBr, KCl, KBr, CaCl 2 , MgCl 2 , NaNO 3 , KNO 3 , NaC 2 H 3 O 2 , KC 2 H 3 O 2 , NaCHO 2 , KCHO 2 , and combinations thereof.

16. The composition of claim 1 , wherein:
the at least one hydrolyzed repeat unit comprises repeat unit IV;
the ratio of repeat unit IV to repeat unit II is about 1:10 to about 10:1;
each R 1 is independently selected from the group consisting of —H, —OCH 3 , and —CH 3 , and
each R 2 is independently selected from the group consisting of —H, —OCH 3 , and —CH 3 ;
the amine crosslinker is selected from the group consisting of a polyalkyleneimine, a polyetheramine, a polyalkylenepolyamine, an aliphatic amine, a polyfunctional aliphatic amine, an arylalkylamine, a heteroarylalkylamine, a chitosan, and combinations thereof; and
the salt is selected from NaCl, NaBr, KCl, KBr, CaCl 2 , MgCl 2 , NaNO 3 , KNO 3 , NaC 2 H 3 O 2 , KC 2 H 3 O 2 , NaCHO 2 , KCHO 2 , and combinations thereof.

17. The composition of claim 1 , wherein:
the at least one hydrolyzed repeat unit comprises at least two hydrolyzed repeat units, and the at least two hydrolyzed repeat units comprise repeat unit III and repeat unit IV;
the ratio of repeat unit III to repeat unit II is about 1:10 to about 10:1, and the ratio of repeat unit IV to repeat unit II is about 1:10 to about 10:1;
each R 1 is independently selected from the group consisting of —H, —OCH 3 , and —CH 3 , and
each R 2 is independently selected from the group consisting of —H, —OCH 3 , and —CH 3 ;
the amine crosslinker is selected from the group consisting of a polyalkyleneimine, a polyetheramine, a polyalkylenepolyamine, an aliphatic amine, a polyfunctional aliphatic amine, an arylalkylamine, a heteroarylalkylamine, a chitosan, and combinations thereof; and
the salt is selected from NaCl, NaBr, KCl, KBr, CaCl 2 , MgCl 2 , NaNO 3 , KNO 3 , NaC 2 H 3 O 2 , KC 2 H 3 O 2 , NaCHO 2 , KCHO 2 , and combinations thereof.

Assignees

• Saudi Arabian Oil Co

Inventors

• Reddy B Raghava

Classifications

• C09K8/512

  containing cross-linking agents · CPC title

• C09K8/50

  Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls (compositions for consolidating loose sand or the like around wells C09K8/56) · CPC title

• C09K8/5083 Primary

  obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• E21B33/14

  for cementing casings into boreholes · CPC title

• C09K8/035

  Organic additives · CPC title