Device for determining e.g. thermal conductivity of loose rock in borehole, has measuring arms whose etalons are associated within respective measuring arms for evaluating layer casing and comprises dark heat absorbing coatings

摘要

The device (1) has measuring arms (6-9) comprises respective etalons (11, 13, 14, 19) at an end. The etalon of one measuring arm is arranged outside the measuring arm and comprises a dark heat absorbing coating (15). The etalon is arranged in contact with a borehole wall (24) such that a to-be-evaluated two-layer casing or a to-be-evaluated double layer (23) is provided. The etalons of other measuring arms are associated within the respective measuring arms for evaluating the layer casing and comprises the dark heat absorbing coatings toward a measuring source. The measuring arms are formed as hydraulic or pneumatic telescopically extensible measuring arms. An independent claim is also included for a method for determining depth of a borehole given by heat parameters in the borehole.