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

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

1987-10-09

1989-04-18

Dixon, Jr., William R.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106 98, C04B 700, C04B 1400

Patent

active

048224227

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.

REFERENCES:
patent: 4504320 (1985-03-01), Rizer et al.
patent: 4689084 (1987-08-01), Ambroise et al.
Grant et al., Chemical Dictionary, McGraw Hill (NY) (1969), p. 572.

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