Ca(OH).sub.2 -treated ceramic microsphere

Details Ca(OH).sub.2 -treated ceramic microsphere Ca(OH).sub.2 -treated ceramic microsphere

1988-12-13

1990-06-26

Hearn, Brian E.

Wells

Processes

Specific low fluid loss feature for fracturing fluid or...

166292, E21B 4326

Patent

active

049363840

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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