Methods and compositions for sealing subterranean zones
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United States of America Patent
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Dec 6, 2005
Grant Date -
Aug 26, 2004
app pub date -
Feb 26, 2003
filing date -
Feb 26, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
Methods and compositions for sealing subterranean zones having temperatures in the range of from about 80° F. to about 300° F. are provided. A method of the invention is basically comprised of the steps of providing a subterranean zone sealing composition that becomes substantially rigid when exposed to subterranean zone temperatures above about 80° F. and has a pH above about 8.5 comprised of water, a substantially fully hydrated depolymerized polymer and a cross-linking agent. The sealing composition is introduced into the subterranean zone whereby it becomes rigid and seals the zone. The sealing composition can subsequently be removed by contact with a fluid having a pH below about 8 when a boron compound is utilized as the cross-linking agent.
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