FIELD: well survey, particularly gamma-gamma downhole instrument logging.
SUBSTANCE: logging device comprises sealed body, gamma radiation source, screens with collimating windows and gamma radiation sensors resiliently installed in pipes. The body is sectional. The pipes are uniformly distributed along logging device perimeter and are fixedly secured to supports. Screen with sectored, collimating windows is arranged between the pipes. The device also has closure with aligning means, which regulate gamma radiation sensor installation, and support bushes with annular ledges formed on outer surfaces thereof.
EFFECT: increased vibration and impact resistance of units and expanded operational capabilities of logging device.
7 cl, 5 dwg
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