EARTH FORMATION SURVEYING DEVICE

摘要

A survey device for use in a borehole formed in an earth formation is disclosed. The device comprises a carrier body (1) carrying earth formation survey means (28, 30) and drilling means (9) arranged at the front end of the device for drilling of the borehole, means for progressing the carrier body through the borehole in correspondence with progress of drilling by the drilling means, and means (22, 24) for removing the rock particles resulting from the drilling process. The means for removing the rock particles comprises means for transporting the rock particles to the rear end (16) of the device and depositing the rock particles into the borehole behind the rear end of the device.