content_image/930158.jpg
# c19) United States c12) Patent Application Publication 

# Wadekar et al. 

# (54) CATIONIC VISCOELASTIC SURFACTANT WITH NON-CATIONIC CORROSION INHIBITOR AND ORGANIC ANION FOR ACIDIZING 

(71) Applicant: HALLIBURTON ENERGY SERVICES, INC., Houston, TX (US) 

(72) Inventors: Sushant Dattaram Wadekar, Mumbai (IN); Nisha Kaustubh Pandya, PUNE (IN); Lalit Pandurang Salgaonkar, Pune (IN); Anupom Sabhapondit, Pune (IN) 

(73) Assignee: Halliburton Energy Services, Inc., Houston, TX (US) 

(21) Appl. No.: 13/787,549 

(22) Filed: Mar. 6, 2013 

(51) Int. Cl. C09K 8174 (2006.01) 

## Publication Classification 

<img src='content_image/930158.jpg'>

(52) U.S. Cl. CPC ........................................ C09K 8174 (2013.01) USPC ........................................... 507/237; 507/240 

## (57) ABSTRACT 

A treatment fluid and method treating a zone of a subterra› nean formation penetrated by a well bore. The treatment fluid includes: (i) water; (ii) a strong acid; (iii) a cationic viscoelas› tic surfactant; (iv) an anionic organic component having at least 4 carbon atoms; and (v) a non-cationic corrosion inhibi› tor; wherein the pH of the treatment fluid is less than 0.5. Preferably, the viscosity of the treatment fluid is less than 5 cP at 40 sec-1. The method includes the steps of: (A) forming the treatment fluid; (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. Preferably, as the acid spends in the subterranean formation, the viscosity of the treatment fluid increases in the well to above 5 cP. Such a treatment fluid shows good rheological properties at temperatures above 93° C. (200° F.). 

US 20140256604Al 

# c10) Pub. No.: US 2014/0256604 Al 

# (43) Pub. Date: Sep. 11, 2014 

