TECHNICAL STATUS OF DRILL HOLES

Technical status of a drill hole can be video-monitored using a TV camera. Casing conditions, sites of casing joints, sites of damage to casing, as well as punctured casing intervals and incrustations can be monitored in the drill holes. In the case of poor visibility in a drill hole, technical status of a drill hole can be determined using the caliper, the down-hole electric sounding or the magnetic susceptibility survey.