Preventing flow through subterranean zones
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United States of America Patent
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Aug 19, 2003
Issued Date -
N/A
app pub date -
Oct 26, 2000
filing date -
Dec 4, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention provides methods of preventing the flow of water or gas or both through a subterranean zone having a high temperature and a depth such that a long pumping time is required to place a sealing composition therein. The methods basically comprise the steps of preparing a polymeric sealing composition comprised of water, a cross-linking agent and a selected water-soluble polymer which reacts with the cross-linking agent and forms a sealing gel which is stable for a desired period of time at the temperature of the zone and has a pumping time before gelation in the presence of the cross-linking agent whereby the composition can be pumped to the depth of the zone and placed therein. Thereafter, the sealing composition is pumped into the zone and allowed to form a sealing gel therein.
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