Use of encapsulated chemical during fracturing
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United States of America Patent
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Mar 12, 2013
Grant Date -
Dec 9, 2010
app pub date -
Jun 3, 2009
filing date -
Jun 3, 2009
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for hydraulic fracturing of a subterranean reservoir formation penetrated by a wellbore includes pumping a fracturing fluid or other aqueous fluid from the surface via the wellbore and into the reservoir. This fluid is an aqueous suspension of particles which each comprise an oilfield chemical distributed within an encapsulating matrix of water-insoluble carrier material. The encapsulating matrix is chosen so as to provide a delayed release of the oilfield chemical from the particles into surrounding fluid, such that oilfield chemical is liberated from the particles after they have entered the fracture. The encapsulating matrix may be a polymer which is at least partially amorphous, with a glass transition temperature below the reservoir temperature.
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