Treating wells with a temporarily thickening cellulose ether solution
Patent
·
OSTI ID:6638032
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 either dispersed in aqueous liquid solutions of buffering agents, pH- increasing 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. (9 claims)
- Assignee:
- Shell Oil Co.
- Patent Number(s):
- US 4026361
- OSTI ID:
- 6638032
- Country of Publication:
- United States
- Language:
- English
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