Well treatment fluid and methods for blocking permeability of a subterranean zone
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United States of America Patent
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Oct 31, 2006
Grant Date -
Oct 20, 2005
app pub date -
Apr 16, 2004
filing date -
Apr 16, 2004
priority date (Note) -
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Abstract
The present invention provides a method and treatment fluid for blocking the permeability of an elevated-temperature zone in a reservoir of a subterranean formation penetrated by a wellbore, the method comprising the steps of: a) selecting the zone to be treated, wherein the upper limit of the temperature range of the zone is equal to or greater than 190.degree. F. (88.degree. C.); b) forming a well treatment fluid comprising: water; a water-soluble polymer comprising polymerized vinyl amine units; and an organic compound capable of crosslinking with the vinyl amine units of the water-soluble polymer; c) selecting the water-soluble polymer and the organic compound of the well treatment fluid such that the gel time of the well treatment fluid is at least 2 hours when measured at the upper limit of the temperature range of the zone; and d) injecting the well treatment fluid through the wellbore and into the zone.
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