Ca(OH)[sub 2]-treated ceramic microsphere

Patent · Tue Jun 26 00:00:00 EDT 1990

OSTI ID:7270127

Sugama, Toshifumi

Geothermal wells with lost circulation problems are treated with a lightweight, high temperature (i.e. 350 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--300 C. Preferably, the alkali solution is a saturated aqueous solution and the treatment is for 10 hours. 2 figs.

• DOE Contract Number: AC02-76CH00016
• Assignee: Associated Universities, Inc., Washington, DC (United States)
• Patent Number(s): US 4936384; A
• Application Number: PPN: US 7-283619
• OSTI ID: 7270127
• Resource Relation: Patent File Date: 13 Dec 1988
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
GEOTHERMAL WELLS
LOST CIRCULATION
REPAIR
PLUGGING AGENTS
CHEMICAL COMPOSITION
ADDITIVES
CALCIUM HYDROXIDES
CEMENTS
MICROSPHERES
ALKALINE EARTH METAL COMPOUNDS
BUILDING MATERIALS
CALCIUM COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXIDES
MATERIALS
OXYGEN COMPOUNDS
WELLS
150901* - Geothermal Engineering- Drilling Technology & Well Hardware