Delayed-gelation solution
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United States of America Patent
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Sep 25, 2007
Grant Date -
Jul 13, 2006
app pub date -
Aug 20, 2003
filing date -
Aug 29, 2002
priority date (Note) -
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Abstract
The invention concerns an aqueous delayed-gelation solution and a method of selectively placing a delayed-gelation solution in a hydrocarbon well. According to the invention, the aqueous delayed-gelation solution a dissolved metal salt which, in use, hydrolyses to form a gel, wherein the solution contains suspended inorganic particles and the method comprises the steps of--providing the aqueous delayed-gelation solution, and--injecting the solution into the hydrocarbon well, whereby the suspended inorganic particles reduce or block the flow of the delayed-gelation solution to relatively low permeability formation zones thereby selectively placing the solution in a relatively high permeability formation zone. Applications of the invention relate to the treatment of hydrocarbon wells.
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