Method and device for making measurements characterizing geological formations, in a horizontal borehole formed from an underground way

摘要

A method is provided for making measurements in geological formations from a horizontal borehole or a borehole with limited slant with respect to the horizontal, formed in the wall of an underground way. It includes essentially a probe containing measuring instruments, adapted to be introduced and pushed into the borehole at the end of an elongate element such as a semirigid tube which is wound off a storage reel, straightened and moved linearly by feed means. The tube passes through a sealing element disposed at the orifice of the borehole. It contains a transmission cable for connecting the probe to a control and recording assembly and it communicates through a rotary hydraulic and electric collector with a pumping system provided for filling the bored hole with fluid before making the measurements.