Method for treating subterranean formation
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United States of America Patent
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Jan 11, 2005
Grant Date -
Dec 25, 2003
app pub date -
Jun 20, 2002
filing date -
Jun 20, 2002
priority date (Note) -
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Abstract
A method is given in which there is delayed release from the treatment fluid of solid chemicals that are obtained in bulk powder form. The method is used in situations in which it is difficult to encapsulate the chemical to achieve delayed release because the chemical is obtained in powdered form. The method involves delivering the powdered chemical in capsules consisting of encapsulated granulates obtained by aggregating the bulk powder under pressure to form a densified material and, optionally, then dry comminuting the densified material to produce granulates of the desired size. The treatment is hydraulic fracturing and the chemical is a breaker, or the treatment is well cementing and the chemical is a dispersing agent, fluid loss control additive, set accelerator, or extender.
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