Method of reducing zone permeability by in-situ formation gel of urotropin and urea in an aqueous solution
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United States of America Patent
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Feb 16, 2016
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Mar 14, 2013
app pub date -
Sep 7, 2012
filing date -
Sep 8, 2011
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Abstract
Mineral oil is produced from underground mineral oil deposits by injecting one or more flooding media into an injection well and withdrawing mineral oil from a production well. Highly permeable zones are blocked in the region between the injection well and the production well by separately injecting, in succession, two different aqueous formulations, one having water and urotropin and the other having water and urea, through the injection well into the deposit. The two different aqueous formulations mix in the formation after injection to form viscous gels. Either or both formulations have at least one further metal or semimetal compound that can form gels when admixed with bases. The injection well temperature is not more than 60° C.
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