differential temperature survey

differential temperature survey

[‚dif·ə′ren·chəl ′tem·prə·chər ‚sər‚vā]
(petroleum engineering)
Well-temperature logging method that detects very small temperature anomalies; two thermometers, 6 feet (1.8 meters) apart, record the temperature gradient down the well bore, with small difference changes showing up anomalies.
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