Tiltmeter Instrumentation for Deep Hole Operation
Annual technical rept. 15 Jun 1970-14 Jun 1971
LITTLE (ARTHUR D) INC CAMBRIDGE MA
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A deep-hole tiltmeter system was developed and constructed for the purpose of measuring and recording two components of tilt resulting from changes in earth strain associated with tectonic processes or geotechnical operations such as fluid injection. The downhole unit is designed so as to permit continuous operation in wells up to 3000 m 9200 ft deep at temperatures as high as 120C and fluid pressures up to 5000 psi. The drift diameter of the smallest well casing in which the downhole unit can be placed is 5.55 in. The instrument is lowered in the well by a 7-conductor, double-armored cable and firmly attached to the well casing at the specified depth by a remotely operated holelock. The instrument can be retrieved using the same cable. The electronics system allows selective execution of commands for several presently seven different functions of the downhole unit.
- Geology, Geochemistry and Mineralogy
- Test Facilities, Equipment and Methods