Methods and compositions of piperazine-based viscoelastic surfactants as diversion agents

Patent metadata

Field	Value
Publication number	US-11739255-B2
Application number	US-202117454695-A
Country	US
Kind code	B2
Filing date	Nov 12, 2021
Priority date	Nov 12, 2021
Publication date	Aug 29, 2023
Grant date	Aug 29, 2023

Abstract

A wellbore fluid including a first surfactant, a second surfactant, an activator and an aqueous base fluid is provided. The first surfactant has a structure represented by Formula (I):where Y1, Y2, Y3, Y4 are each, independently, a sulfonate, a carboxylate, an ester or a hydroxyl group, m is an integer ranging from 2 to 3, and n, o, and k are each, independently, integers ranging from 2 to 10. The second surfactant has a structure represented by Formula (III):where R2 is a C15-C27 hydrocarbon group or a C15-C29 substituted hydrocarbon group, R3 is a C1-C10 hydrocarbon group, and p and q are each, independently, an integer ranging from 1 to 4. A method of using the wellbore fluid for treating a hydrocarbon-containing formation is also provided.

First claim

What is claimed is:

1. A wellbore fluid, comprising:
a first surfactant having a structure represented by Formula (I):

wherein Y 1 , Y 2 , Y 3 , Y 4 are each, independently, a sulfonate, a carboxylate, an ester or a hydroxyl group, m is an integer ranging from 2 to 3, and n, o, and k are each, independently, integers ranging from 2 to 10;
a second surfactant having a structure represented by Formula (III):

wherein R 2 is a C 15 -C 27 hydrocarbon group or a C 15 -C 29 substituted hydrocarbon group, R 3 is a C 1 -C 10 hydrocarbon group, and p and q are each, independently, an integer ranging from 1 to 4;
an activator; and
an aqueous base fluid.

2. The wellbore fluid according to claim 1 , wherein the first surfactant has a structure represented by formula (II):

3. The wellbore fluid according to claim 1 , wherein the second surfactant has a structure represented by formula (IV):

4. The wellbore fluid according to claim 1 , comprising 1 to 15 wt. % of the first surfactant.

5. The wellbore fluid according to claim 1 , comprising 1 to 15 wt. % of the second surfactant.

6. The wellbore fluid according to claim 1 , comprising 5 to 30 wt. % of the activator.

7. The wellbore fluid according to claim 1 , further comprising an acid.

8. The wellbore fluid according to claim 1 , wherein the activator is CaCl 2 ).

9. The wellbore fluid according to claim 1 , wherein the wellbore fluid has a viscosity at 90° C. ranging from 150 to 400 cP.

Assignees

• Saudi Arabian Oil Co
• Univ King Fahd Pet & Minerals

Inventors

• Kalgaonkar Rajendra Arunkumar
• Bataweel Mohammed Abudullah
• Alali Eyad
• Ullah Nisar
• MANSHA Muhammad

Classifications

• C09K8/584 Primary

  characterised by the use of specific surfactants · CPC title

• E21B43/16

  Enhanced recovery methods for obtaining hydrocarbons · CPC title

• E21B43/27

  by use of eroding chemicals, e.g. acids · CPC title

• C09K2208/30

  Viscoelastic surfactants [VES] · CPC title

• C09K8/602

  containing surfactants · CPC title