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

Patent · Mon Jan 01 00:00:00 EST 1990

OSTI ID:867435

Sugama, Toshifumi ^[1]

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1. Mastic Beach, NY

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.

• Research Organization: Associated Universities, Inc., Upton, NY (United States)
• DOE Contract Number: AC02-76CH00016
• Assignee: Associated Universities, Inc. (Washington, DC)
• Patent Number(s): US 4936384
• OSTI ID: 867435
• Country of Publication: United States
• Language: English

Related Subjects

oh
-treated
ceramic
microsphere
geothermal
lost
circulation
treated
lightweight
temperature
350
degree
cement
slurry
incorporates
pressure
resistant
hollow
microspheres
spheres
pretreated
alkali
compound
20
hours
100
-300
preferably
solution
saturated
aqueous
treatment
10
lost circulation
hollow microspheres
aqueous solution
alkali solution
pressure resistant
resistant hollow
ceramic microsphere
-treated ceramic
incorporates pressure
treated ceramic
cement slurry
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