FIELD: oil and gas production industry. SUBSTANCE: this is employed in geophysical investigation of wells. Device has temperature sensor and heater which are separated from each other along axis of well through distance not shorter than inner diameter of casing string. Heater is made in the form of induction coil. EFFECT: higher efficiency. 1 dwg
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Authors
Dates
1998-04-10—Published
1996-04-18—Filed