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Detection, diagnosis, and prognosis in geothermal well technology

Author
Veneruso, A. F.
Published
United States : [publisher not identified], 1980.
Springfield, Va. : National Technical Information Service, [approximately 1980]
Physical Description
microfiche : negative ; 11 x 15 cm
Additional Creators
Chang, H. T.

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Summary
For successful and safe operation of a geothermal well, the condition of the casing and cement must be accurately determined. Measurements on casing wall thickness, corrosion damage, holes, cracks, splits, etc., are needed to assess casing integrity. Cement bond logs are needed to detect channels or water pockets in cement behind pipe and to determine the state of the cement bond to the pipe and formation. Instrumentation for making such measurements is limited by the temperature capabilities (<175/sup 0/C) of existing logging equipment developed for the oil and gas industry. The instruments that are needed for geothermal casing and cementing inspection are reviewed; the principle deficiencies in their high temperature use are identified; and Sandia's upgrade research program on multi-arm caliper and acoustic cement bond logging tool is described. The key electronic section in a multi-arm caliper will consist of 275/sup 0/C circuits. In an acoustic cement bond logging tool, a simple circuit with possibilities of using commercially available components for high temperature operation is being developed. These new tools will be field tested for operation at a minimum temperature of 275/sup 0/C and pressure of 7000 psi for up to 1000 hours.
Report Numbers
SAND-80-2026C; CONF-801059-1
Other Subject(s)
Collection
NTIS collection.
Note
DOE contract number: AC04-76DP00789
OSTI Identifier 5145375
Research organization: Sandia National Labs., Albuquerque, NM (USA).
View MARC record | catkey: 45336222