Aqueous gelling and/or foaming agents for aqueous acids and meth

Details Aqueous gelling and/or foaming agents for aqueous acids and meth Aqueous gelling and/or foaming agents for aqueous acids and meth

1986-03-07

1987-09-22

Guynn, Herbert B.

Compositions

Leather or fur treating

166307, E21B 4327

Patent

active

046953892

ABSTRACT:
A novel buffered gelling/foaming agent and resulting gelled aqueous inorganic acid solution involving a N,N-bis (2-hydroxyethyl) fatty amine acetic acid salt (e.g., N,N-bis (2-hydroxyethyl) tallow ammonium acetate); alkali metal acetate; and acetic acid buffered system. The buffered gelling/foaming agent compositions exhibit pragmatic advantages in preparation, handling and use particularly at low temperatures because of low pour points (e.g., 5.degree.-10.degree. F.). Furthermore, the buffered gelling agent more efficiently utilizes the active ingredients in terms of desired viscosity rise as a function of concentration. The resulting gelled aqueous inorganic acid solutions using the buffered gelling agent exhibit a novel viscosity rise and calcium ion viscosity contribution as the concentrated acid is partially spent (i.e., approaches 12%), yet the totally spent acid returns to a nominal viscosity and is a foaming medium. As such, the novel buffered gelling agent and resulting gelled acid solutions are useful in acidizing and fracturing subterranean formations.

REFERENCES:
patent: 3889753 (1975-06-01), Richardson
patent: 4061580 (1977-12-01), Jahnke
patent: 4148736 (1979-04-01), Meister
patent: 4324669 (1982-04-01), Norman et al.
patent: 4369124 (1983-01-01), Elphingstone et al.

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