Viscoelastic acid

Details Viscoelastic acid Viscoelastic acid

2008-03-11

2008-03-11

Buttner, David J. (Department: 1796)

Wells

Processes

Placing fluid into the formation

C166S300000, C166S307000, C166S308200, C507S240000, C507S269000, C507S277000

Reexamination Certificate

active

07341107

ABSTRACT:
An acidic viscoelastic surfactant fluid composition is formulated with an acid, for example hydrochloric acid, a cationic surfactant, for example a quaternary amine, and a break-enabling salt, for example NH4Cl. The fluid composition has low viscosity as formulated, undergoes an increase in viscosity as the acid is consumed when it reacts with an acid-reactive material, and returns to approximately the initial viscosity as the last of the acid is consumed. The fluid composition is used as a diverting fluid or as the main treatment fluid in oilfield treatments such as matrix acidizing and acid fracturing.

REFERENCES:
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patent: 5551516 (1996-09-01), Norman et al.
patent: 5964295 (1999-10-01), Brown et al.
patent: 6232274 (2001-05-01), Hughes et al.
patent: 6399546 (2002-06-01), Chang et al.
patent: 2002/0004464 (2002-01-01), Nelson et al.
patent: 2003/0119680 (2003-06-01), Chang et al.
patent: 2004/0138071 (2004-07-01), Gupta et al.
patent: 2004/0214725 (2004-10-01), Moss

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