Scale squeeze treatment systems and methods

Earth boring – well treating – and oil field chemistry – Well treating – Contains organic component

Reexamination Certificate

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C507S090000, C507S236000, C507S238000, C507S240000, C507S241000, C507S245000, C507S260000, C507S267000, C507S269000, C166S304000, C166S305100

Reexamination Certificate

active

07915204

ABSTRACT:
An aqueous composition for treating hydrocarbon wells contains (a) a scale inhibitor and (b) a viscoelastic surfactant, and further contains from 0 to less than 1% by weight of acid selected from the group consisting of hydrochloric acid, sulfuric acid, phosphoric acid, formic acid, acetic acid, citric acid, maleic acid, hydrofluoric acid, and mixtures thereof.

REFERENCES:
patent: 6342467 (2002-01-01), Chang et al.
patent: 6831108 (2004-12-01), Dahanayake et al.
patent: 6903054 (2005-06-01), Fu et al.
patent: 7021378 (2006-04-01), Prukop
patent: 7380602 (2008-06-01), Brady et al.
patent: 2004/0254079 (2004-12-01), Frenier et al.
SPE 94593 paper, “Application of a Fully Viscosified Scale Squeeze for Improved Placement in Horizontal Wells”, J.S. James, D.M. Frigo, SPE, and M.M. Townsend, Shell U.K. Ltd.; G.M. Graham, SPE, and F. Wahid, Scaled Solutions Ltd.; and S.M. Health, SPE, Clariant UK, Copyright 2005, Society of Petroleum Engineers Inc.
S. Gravsholt, “Viscoelasticity in Highly Dilute Aqueous Solutions of Pure Cationic Detergents”, Journal of Colloid and Interface Science, 573(3), 575 (1976).
Hoffmann et al., “Influence of Ionic Surfactants on the Viscoelastic Properties of Zwitterionic Surfactant Solutions”, Langmuir, 8, 2140-2146 (1992).
Hoffmann et al., The Rheological Behaviour of Different Viscoelastic Surfactant Solutions, Tenside Surf. Et., 31, 389-400, 1994.
“Rheological Measurements”, Encyclopedia of Chemical Technology, vol. 21, pp. 347-372, (John Wiley & Sons, Inc., N.Y., N.Y., 1997, 4th ed.).

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