DOWN-HOLE TELEMETRIC SYSTEM Russian patent published in 1998 - IPC

FIELD: mining industry. SUBSTANCE: this relates to mining industry geophysics, and particularly to measuring down-hole parameters in process of drilling bore-holes. Components of telemetric system are drilling string, body, power supply unit, measuring modules, transmitting device modules, electric divider, and bottom-hole motor. Diameters of body of measuring modules and power supply unit are less than inner diameter of drilling string. Length of modules L is equal to , where R - minimal radius of bore-hole trajectory; h - half difference of inner diameters of body of measuring modules. Electric divider is made in the form of separate conductor installed directly above bottom-hole motor. Power supply unit, measuring and transmitting modules are interconnected by links which are flexible in radial direction and rigid in longitudinal direction. Usable in function of links between modules are metal pipes which are flexible in radial direction and are of diameter less than diameter of module body. Located inside pipes is electric cable. Centralizers are installed on ends of pipes. For unobstructed removing of bottom-hole system from drilling pipe string in emergency situation, electric contact with bottom of drilling string is of sliding type. EFFECT: higher efficiency. 2 cl, 2 dwg