Monitoring and repairing geothermal casing cement: a case history

Conference · Tue Jan 01 04:00:00 EST 1980

OSTI ID:5353877

Pettitt, R A

A manmade geothermal reservoir has been created by drilling a deep hole into relatively impermeable hot rocks, creating a large surface area for heat transfer by hydraulic fracturing, then drilling a second hole to intersect the fracture to complete the closed circulation loop. A second generation system, presently being drilled, will entail creating multiple, parallel, vertical fractures between a pair of inclined boreholes. The original completion of injection Hole EE-1, consisting of a conventional high-temperature formulation of Class B portland cement, stabilized with 40% silica sand, did not withstand the cyclic stresses, and rapid deterioration of casing-to-cement and cement-to-formation bonds occurred, which allowed significant flow in the resulting microannulus. The performance history of the casing cement for the existing HDR EE-1 injection well, the subsequent remedial cementing program, the cement bond logs, and the radioactive isotope tracer injections tests, used to monitor the condition of the casing cement is described. (MHR)

• Research Organization: Los Alamos Scientific Lab., NM (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5353877
• Report Number(s): LA-UR-80-1485; CONF-800920-5
• Country of Publication: United States
• Language: English

Related Subjects

15 GEOTHERMAL ENERGY
150901* -- Geothermal Engineering-- Drilling Technology & Well Hardware
BUILDING MATERIALS
CEMENTS
CHALCOGENIDES
COMMINUTION
DRILLING
ENERGY TRANSFER
FRACTURING
GEOTHERMAL SYSTEMS
GEOTHERMAL WELLS
Geothermal Legacy
HEAT TRANSFER
HOT-DRY-ROCK SYSTEMS
HYDRAULIC FRACTURING
INJECTION WELLS
MATERIALS
MINERALS
OXIDES
OXYGEN COMPOUNDS
REPAIR
SILICA
SILICON COMPOUNDS
SILICON OXIDES
WELL CASINGS
WELL DRILLING
WELLS