FIELD: testing of ground formation.
SUBSTANCE: device has change-over unit which has elongated body with tubular walls and central hole, made for placement of descending instrument. Tubular member has sections for transmission or/and reception of signal through tubular member; sections are provided with slots. Hydraulic insulation between internal and external sides of tubular member is provided by making anti-pressure barrier in slot-provided sections. Detectors and/or sources are mounted onto descending member made for passing through drill pipe string to engage inside tubular member when getting in coincidence with slot-provided sections. Descending member has modulator to conduct electric communication with surface in real-time scale and/or with remote well instrument. Assemblage of tubular member and descending instrument includes communication inductive members fro transmitting parameters of signal along radio channel. Descending instrument with replaceable end segment is used in method for measurement characteristics of formation for passing well through in different modes.
EFFECT: simplification; improved reliability; higher efficiency.
33 cl, 28 dwg
