Surfactant flowback aids for use in subterranean formation operations

Patent metadata

Field	Value
Publication number	US-10995261-B2
Application number	US-201616329683-A
Country	US
Kind code	B2
Filing date	Dec 13, 2016
Priority date	Dec 13, 2016
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

The embodiments herein relate generally to subterranean formation operations and, more particularly, to surfactant flowback aids for use in subterranean formation operations. The surfactant flowback aid composition may comprise an aqueous phase comprising an aqueous base fluid, a surfactant blend, and a demulsifier. The surfactant blend may comprise a C8-C18 alcohol ethoxy-late; a fatty acid alkanolamide; and optionally, a surfactant selected from the group consisting of a non-ionic surfactant, an anionic surfactant, a cationic surfactant, an amphoteric surfactant, and any combination thereof. The demulsifier may be selected from the group consisting of a desalter agent to separate water from crude oil, a treater agent to flocculate submicron particulates from crude oil, and any combination thereof.

First claim

What is claimed is:

1. A method comprising:
introducing into a subterranean formation a flowback aid composition comprising:
an aqueous phase comprising an aqueous base fluid;
a surfactant blend comprising:
a C 8 -C 18 alcohol ethoxylate;
a fatty acid alkanolamide; and
a surfactant selected from the group consisting of a non-ionic surfactant, an anionic surfactant, a cationic surfactant, an amphoteric surfactant, and any combination thereof;

a demulsifier selected from the group consisting of a desalter agent to separate water from crude oil, a treater agent to flocculate submicron particulates from crude oil, and any combination thereof,
an aqueous-soluble co-solvent;
an oil phase comprising a high-solvency oil, and
wherein the flowback aid compensation is a microemulsion or a nanoemulsion.

2. The method of claim 1 , wherein the flowback aid composition is a mesophase emulsion.

3. The method of claim 1 , wherein the desalter agent is selected from the group consisting of a polyalkylene oxide polyol, a polyether polyol, a dedridic polyalkylene oxide polyol, and any combination thereof.

4. The method of claim 1 , wherein the desalter agent is selected from the group consisting of Structure XV, Structure XVI, Structure XVII, and any combination thereof, as follows:

wherein (PO) n represents moles of propylene oxide, (EO) m represents moles of ethylene oxide, n is an integer of from about 1 to about 15, and m is an integer of from about 1 to about 15;

wherein (PO) n represents moles of propylene oxide, (EO) m represents moles of ethylene oxide, n is an integer of from about 1 to about 15 and m is an integer of from about 1 to about 15;

wherein R is H, C 1 , C 2 , C 3 , C 4 , or C 6 , m is an integer of from about 1 to about 20, and n is an integer of from about 1 to about 20.

5. The method of claim 1 , wherein the treater agent is selected from the group consisting of a polyethyleneimine alkoxylate, an ethylenediamine alkoxylate, and any combination thereof.

6. The method of claim 1 , wherein the treater agent is selected from the group consisting of Structure XVIII, Structure XIX, and any combination thereof, as follows:

wherein, (PO) n represents moles of propylene oxide, and n is an integer of from about 1 to about 10;

wherein, (PO) n represents moles of propylene oxide, (EO) m represents moles of ethylene oxide, n is an integer of from about 1 to about 10, and m is an integer of from about 1 to about 10.

7. The method of claim 1 , wherein the flowback aid composition further comprises a dropper agent to coalesce and release free water.

8. The method of claim 1 , wherein the flowback aid composition further comprises a dropper agent to coalesce and release free water, and the dropper agent is an alkoxylated alkylphenol resin.

9. The method of claim 1 , further comprising introducing the flowback aid composition into the subterranean formation alone or in a treatment fluid at a pressure above a fracture gradient of the subterranean formation to create or enhance at least one fracture therein.

10. The method of claim 1 , further comprising reducing or eliminating an emulsion present in the subterranean formation, reducing or eliminating formation of an emulsion in the subterranean formation, or reducing or eliminating both an emulsion present in the subterranean formation and formation of an emulsion in the subterranean formation.

11. The method of claim 1 , wherein the subterranean formation comprises an emulsion of produced petroleum, and further comprising contacting the emulsion of produced petroleum with the flowback aid composition, thereby reducing or eliminating the emulsion of produced petroleum.

12. The method of claim 1 , further comprising a tubular extending into the subterranean formation and fluidly coupled to a pump, the tubular containing the flowback aid composition.

13. A method comprising:
introducing into a subterranean formation a flowback aid composition comprising:
an aqueous phase comprising an aqueous base fluid;
an oil phase comprising a high-solvency oil;
a surfactant blend comprising:
a C 8 -C 18 alcohol ethoxylate;
a fatty acid alkanolamide; and
a surfactant selected from the group consisting of a non-ionic surfactant, an anionic surfactant, a cationic surfactant, an amphoteric surfactant, and any combination thereof;

a demulsifier selected from the group consisting of a desalter agent to separate water from crude oil,
an aqueous-soluble co-solvent;
a dropper agent in coalesce and release free water, and the dropper agent is an alkoxylated alkylphenol resin, and
wherein the flowback aid composition is a microemulsion or a nanoemulsion.

14. The method of claim 13 , further comprising reducing or eliminating an emulsion present in the subterranean formation, reducing or eliminating formation of an emulsion in the subterranean formation, or reducing or eliminating both an emulsion present in the subterranean formation and formation of an emulsion in the subterranean formation by contact with the flowback fluid.

15. A flowback aid composition comprising:
an aqueous phase comprising an aqueous base fluid;
a surfactant blend comprising:
a C 8 -C 18 alcohol ethoxylate;
a fatty acid alkanolamide; and
a surfactant selected from the group consisting of a non-ionic surfactant, an anionic surfactant, a cationic surfactant, an amphoteric surfactant, and any combination thereof; and

a demulsifier selected from the group consisting of a desalter agent to separate water from crude oil, a treater agent to flocculate submicron particulates from crude oil, and any combination thereof.

16. The flowback aid composition of claim 15 , wherein the flowback aid composition is a mesophase emulsion.

17. The flowback aid composition of claim 15 , wherein the flowback aid composition further comprises an oil phase comprising a high-solvency oil, and the flowback aid composition is a microemulsion or a nanoemulsion.

18. The method of claim 13 , wherein the desalter agent is selected from the group consisting of a polyalkylene oxide polyol, a polyether polyol, a dedridic polyalkylene oxide polyol, and any combination thereof.

19. The method of claim 13 , further comprising introducing the flowback aid composition into the subterranean formation alone or in a treatment fluid at a pressure above a fracture gradient of the subterranean formation to create or enhance at least one fracture therein.

20. The method of claim 13 , wherein the subterranean formation comprises an emulsion of produced petroleum, and further comprising contacting the emulsion of produced petroleum with the flowback aid composition, thereby reducing or eliminating the emulsion of produced petroleum.

Assignees

• Halliburton Energy Services Inc

Inventors

• Holtsclaw Jeremy
• Holan Kristina Henkel
• Hoeman Kurt
• Salamat Golchehreh
• Khamatnurova Tatyana

Classifications

• C09K8/035

  Organic additives · CPC title

• C09K8/68

  containing organic compounds · CPC title

• C09K8/06

  Clay-free compositions (containing inorganic compounds only C09K8/05) · CPC title

• C09K8/602 Primary

  containing surfactants · CPC title

• C09K8/70

  characterised by their form or by the form of their components, e.g. foams · CPC title