US 20140256604Al  c19)  United States  c12)  Patent Application Publication  Wadekar et al.  c10)  Pub. No.: US 2014/0256604 Al  (43)  Pub. Date:  Sep. 11, 2014  (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)  (52)  U.S. Cl.  CPC ........................................  C09K  8174  (2013.01)  USPC ...........................................  507/237;  507/240  (57)  ABSTRACT  Publication Classification  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.). 