Salting out inhibitors for use in treatment fluids

Patent metadata

Field	Value
Publication number	US-11674368-B2
Application number	US-202217834360-A
Country	US
Kind code	B2
Filing date	Jun 7, 2022
Priority date	Jul 18, 2018
Publication date	Jun 13, 2023
Grant date	Jun 13, 2023

Abstract

Methods and system for using salting out inhibitors in subterranean formations are provided. In some embodiments, the methods comprise introducing a treatment fluid comprising an aqueous base fluid, a salting out inhibitor, a gelling agent, and one or more salts into at least a portion of a subterranean formation, wherein the salting out inhibitor is selected from the group consisting of: an oligomer comprising one or more quaternary ammonium cations, a polymer comprising one or more quaternary ammonium cations, a source of one or more phosphate anions, and any combination thereof.

First claim

What is claimed is:

1. A treatment fluid comprising:
an aqueous base fluid;
at least one salting out inhibitor, wherein the at least one salting out inhibitor is selected from the group consisting of: an oligomer comprising one or more quaternary ammonium cations; a polymer comprising one or more quaternary ammonium cations; a source of one or more phosphate anions; and any combination thereof;
a polysaccharide gelling agent; and
one or more salts.

2. The treatment fluid of claim 1 , wherein the treatment fluid further comprises a gravel material.

3. The treatment fluid of claim 1 , wherein the polysaccharide gelling agent comprises at least one gelling agent selected from group consisting of: xanthan, scleroglucan, diutan, succinoglycan, guar, hydroxyethyl cellulose, a derivative of the foregoing, and any combination thereof.

4. The treatment fluid of claim 1 , wherein the one or more salts are present in the treatment fluid in an amount of from about 8.5 lb/gal to about 14.5 lb/gal.

5. The treatment fluid of claim 1 , wherein the one or more salts are selected from the group consisting of: an alkali metal halide salt, an alkaline earth metal halide salt, and any combination thereof.

6. The treatment fluid of claim 1 , wherein the treatment fluid has an apparent viscosity of about 100 cP or less at a shear rate of 100 sec −1 and a temperature of about 250° F.

7. The treatment fluid of claim 1 , wherein the salting out inhibitor comprises a quaternary ammonium salt.

8. The treatment fluid of claim 1 , wherein the salting out inhibitor comprises a polyquaternium compound.

9. The treatment fluid of claim 1 , wherein the salting out inhibitor comprises an ester of phosphonic acid.

10. A treatment fluid comprising:
an aqueous base fluid;
a gravel material;
at least one salting out inhibitor, wherein the at least one salting out inhibitor is selected from the group consisting of: an oligomer comprising one or more quaternary ammonium cations; a polymer comprising one or more quaternary ammonium cations; a source of one or more phosphate anions; and any combination thereof;
a gelling agent, wherein the gelling agent is not hydroxy propyl starch phosphate; and
one or more salts.

11. The treatment fluid of claim 10 , wherein the gelling agent comprises a polysaccharide gelling agent.

12. The treatment fluid of claim 11 , wherein the one or more salts are present in the treatment fluid in an amount of from about 8.5 lb/gal to about 14.5 lb/gal.

13. The treatment fluid of claim 11 , wherein the one or more salts are selected from the group consisting of: an alkali metal halide salt, an alkaline earth metal halide salt, and any combination thereof.

14. The treatment fluid of claim 11 , wherein the treatment fluid has an apparent viscosity of about 100 cP or less at a shear rate of 100 sec −1 and a temperature of about 250° F.

15. The treatment fluid of claim 11 , wherein the salting out inhibitor comprises a quaternary ammonium salt.

16. The treatment fluid of claim 11 , wherein the salting out inhibitor comprises a polyquaternium compound.

17. The treatment fluid of claim 11 , wherein the salting out inhibitor comprises an ester of phosphonic acid.

18. The treatment fluid of claim 11 , wherein the salting out inhibitor is present in an amount of about 10 gal/Mgal or less by volume of the treatment fluid.

19. The treatment fluid of claim 11 , wherein the gravel comprises sand.

20. The treatment fluid of claim 10 , wherein the gelling agent comprises at least one polysaccharide gelling agent selected from group consisting of: xanthan, scleroglucan, diutan, succinoglycan, guar, hydroxyethyl cellulose, a derivative of the foregoing, and any combination thereof.

Assignees

• Halliburton Energy Services Inc

Inventors

• Eluru Sairam
• Meher Pratiksha Shivaji
• Prakash Chetan
• Borra Sandeep Kumar

Classifications

• C09K8/575 Primary

  containing organic compounds · CPC title

• C09K8/80

  Compositions for reinforcing fractures, e.g. compositions of proppants used to keep the fractures open · CPC title

• C09K8/68

  containing organic compounds · CPC title

• E21B43/04 Primary

  Gravelling of wells · CPC title

• E21B43/267

  reinforcing fractures by propping · CPC title