Process for temporarily plugging a permeable subterranean...

Details Process for temporarily plugging a permeable subterranean... Process for temporarily plugging a permeable subterranean...

E - Fixed Constructions

21

B

31/26

E21B 43/26 (2006.01) C09K 8/514 (2006.01)

Patent

CA 1079946

A B S T R A C T 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 cellu- lose ether dispersed in aqueous liquid solutions of buffering agents, pH-increasing reactants and pH-decreasing reactants. The system components are arranged 80 that the cellulose ether hydration is first delayed by a buffer-maintained acidity, then is accelerated by an increasing pH, whereafter the high viscosity due to the dissolved hydrated cellulose ether is reduced by an acid-induced hydrolysis of the ether.

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