Method of using viscosity-stabilized aqueous solutions

Details Method of using viscosity-stabilized aqueous solutions Method of using viscosity-stabilized aqueous solutions

1976-11-09

1978-11-07

Novosad, Stephen J.

Wells

Processes

Distinct, separate injection and producing wells

166274, 166288, 252 855D, E21B 4322, E21B 4324, E21B 33138

Patent

active

041240731

ABSTRACT:
Thiourea functions as a solution viscosity stabilizer in aqueous compositions comprising thiourea, nonionic polymers such as polyalkylene oxides and anionic surfactants such as petroleum sulfonates. The aqueous compositions are useful in connection with fluid-drive oil recovery processes, processes for drilling, completing or working over wells, or the like processes in which a thickened fluid is injected into or brought into contact with a subterranean earth formation.

REFERENCES:
patent: 3116791 (1964-01-01), Sandiford et al.
patent: 3235523 (1966-02-01), Schurz et al.
patent: 3412793 (1968-11-01), Needham
patent: 3663477 (1972-05-01), Ahearn
patent: 3739848 (1973-06-01), Lawson
patent: 3993133 (1976-11-01), Clampitt
patent: 3994345 (1976-11-01), Needham

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