Ca(OH).sub.2 -treated ceramic microsphere
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United States of America Patent
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Apr 18, 1989
Grant Date -
N/A
app pub date -
Oct 9, 1987
filing date -
Oct 9, 1987
priority date (Note) -
Expired
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Abstract
Geothermal wells with lost circulation problems are treated with a lightweight, high temperature (i.e. 350.degree. C.) cement slurry which incorporates pressure resistant hollow microspheres into the slurry wherein the spheres have been pretreated with an alkali compound such as Ca(OH).sub.2 for up to 20 hours and at 100.degree.-300.degree. C. Preferably, the alkali solution is a saturated aqueous solution and the treatment is for 10 hours.
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