Treating wells with a temporarily thickening cellulose ether sol

Details Treating wells with a temporarily thickening cellulose ether sol Treating wells with a temporarily thickening cellulose ether sol

1976-06-14

1977-05-31

Novosad, Stephen J.

Wells

Processes

Separate steps of fracturing or attacking formation

166294, E21B 33138, E21B 4326

Patent

active

040263614

ABSTRACT:
In well treatments such as workovers, fracturing processes, etc., permeable subterranean earth formations are temporarily plugged by contacting them with self thickening-and-thinning liquid systems. The systems initially contain unhydrated cellulose ether dispersed in aqueous liquid solutions of buffering agents, pH-increasing reactants and pH-decreasing reactants. The system components are arranged so that the cellulose ether hydration is first delayed by a buffer-maintained acidity, then is accelerated by an increasing pH and, subsequently, the high viscosity due to the dissolved hydrated cellulose ether is reduced by an acid-induced hydrolysis of the ether.

REFERENCES:
patent: 3353604 (1967-11-01), Gibson et al.
patent: 3378070 (1968-04-01), Wessler et al.
patent: 3719228 (1973-03-01), Carcia
patent: 3795276 (1974-03-01), Eilers et al.
patent: 3868996 (1975-03-01), Lybarger et al.
patent: 3889753 (1975-06-01), Richardson
patent: 3892275 (1975-07-01), Lybarger et al.
patent: 3926258 (1975-12-01), Hessert et al.

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