Branched viscoelastic surfactant for high-temperature acidizing

Patent metadata

Field	Value
Publication number	US-2016237340-A1
Application number	US-201615140922-A
Country	US
Kind code	A1
Filing date	Apr 28, 2016
Priority date	Mar 4, 2013
Publication date	Aug 18, 2016
Grant date	—

Abstract

A treatment fluid for use in a subterranean formation penetrated by the wellbore of a well includes: (i) water; (ii) a strong acid; and (iii) a branched viscoelastic surfactant having a hydrophobic portion with a total of 16 to 20 carbons; wherein the pH of the treatment fluid is less than 0.5; and wherein the viscosity of the treatment fluid is less than 5 cP at 40 sec-1. A method of treating a zone of a subterranean formation penetrated by a wellbore includes the steps of forming the treatment; (B) introducing the treatment fluid through the wellbore into the zone; and (C) allowing time for the strong acid in the treatment fluid to spend in the formation. Such a treatment fluid shows good rheological properties at temperatures above 93° C. (200° F.).

First claim

What is claimed is:

1 . A treatment fluid for use in a subterranean formation penetrated by the wellbore of a well, the treatment fluid comprising:
(i) water; (ii) a strong acid; and (iii) a branched viscoelastic surfactant having at least one hydrocarbon branch of 16 to 20 carbons; wherein the treatment fluid has an initial pH of less than 0.5; and wherein the treatment fluid has a viscosity of less than 5 cP at 40 sec −1 at the initial pH.

2 . The treatment fluid according to claim 1 , wherein the strong acid comprises hydrochloric acid.

3 . The treatment fluid according to claim 1 , wherein the treatment fluid does not include hydrogen fluoride.

4 . The treatment fluid according to claim 1 , wherein the branched viscoelastic surfactant comprises a viscoelastic surfactant having a nitrogen atom with short chain alkyl groups.

5 . The treatment fluid according to claim 1 , wherein the branched viscoelastic surfactant comprises a quaternary of a branched fatty acid substituted amidoamine.

6 . The treatment fluid according to claim 5 , wherein the branched viscoelastic surfactant comprises N-Ethyl-N,N-Dimethyl-[(3-Oxoisooctadecyl)Amino]-1-Propanaminium Ethyl Sulfate.

7 . The treatment fluid according to claim 1 , wherein the treatment fluid additionally comprises: a corrosion inhibitor.

8 . The treatment fluid according to claim 7 , wherein the corrosion inhibitor is selected from the group consisting of: an aldehyde, quaternary quinolinium, and any combination thereof.

9 . The treatment fluid according to claim 7 , wherein the treatment fluid additionally comprises: a corrosion inhibitor intensifier.

10 . The treatment fluid according to claim 9 , wherein the corrosion inhibitor intensifier comprises formic acid.

Assignees

• Halliburton Energy Services Inc

Inventors

• Pandya Nisha Kaustubh
• Wadekar Sushant Dattaram
• Pathre Ganesh Surykant

Classifications

• C09K2208/30

  Viscoelastic surfactants [VES] · CPC title

• C09K2208/32

  Anticorrosion additives · CPC title

• C09K8/74 Primary

  combined with additives added for specific purposes · CPC title

• C09K8/04

  Aqueous well-drilling compositions · CPC title

• C09K8/54

  Compositions for in situ inhibition of corrosion in boreholes or wells · CPC title