Ca(OH)[sub 2]-treated ceramic microsphere
Patent
·
OSTI ID:7270127
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):
- A; US 4936384
- Application Number:
- PPN: US 7-283619
- OSTI ID:
- 7270127
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
15 GEOTHERMAL ENERGY
150901* -- Geothermal Engineering-- Drilling Technology & Well Hardware
ADDITIVES
ALKALINE EARTH METAL COMPOUNDS
BUILDING MATERIALS
CALCIUM COMPOUNDS
CALCIUM HYDROXIDES
CEMENTS
CHEMICAL COMPOSITION
GEOTHERMAL WELLS
HYDROGEN COMPOUNDS
HYDROXIDES
LOST CIRCULATION
MATERIALS
MICROSPHERES
OXYGEN COMPOUNDS
PLUGGING AGENTS
REPAIR
WELLS
150901* -- Geothermal Engineering-- Drilling Technology & Well Hardware
ADDITIVES
ALKALINE EARTH METAL COMPOUNDS
BUILDING MATERIALS
CALCIUM COMPOUNDS
CALCIUM HYDROXIDES
CEMENTS
CHEMICAL COMPOSITION
GEOTHERMAL WELLS
HYDROGEN COMPOUNDS
HYDROXIDES
LOST CIRCULATION
MATERIALS
MICROSPHERES
OXYGEN COMPOUNDS
PLUGGING AGENTS
REPAIR
WELLS