Apparatus and Method for Selectively Placing Additives in Wellbore Cement
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United States of America Patent
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Issued Date -
Jun 9, 2011
app pub date -
Nov 18, 2010
filing date -
Dec 7, 2009
priority date (Note) -
Abandoned
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Abstract
An apparatus for releasing additive into cement pumped into an annular space between a wall of a wellbore and a casing inserted into the wellbore include a cement additive enclosed in a container disposed in the annular space at at least one selected position along the wellbore. The container is configured to release the additive at a selected time.
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