FIELD: mining.
SUBSTANCE: downhole tool is proposed for determining the side branches in the borehole wall or in the borehole casing string, containing: the tool body configured to be lowered into the borehole and the plurality of acoustic transponders. Each acoustic transponder is designed to transmit the acoustic signals from the housing and receive the acoustic signals, reflected from the wall of the borehole or the borehole casing string in the predetermined angular segment, different from the predetermined angular segments, corresponding to the other acoustic transponders from the plurality of acoustic transponders. The plurality of acoustic transponders is disposed along the tool body periphery at the distance from each other and are configured to transmit acoustic signals in the radial direction from the tool body along the whole central angle of 360 degrees to the borehole wall or to the borehole casing string. At that during using, only the part from the acoustic transponders plurality within the impulse time transmits the acoustic signal in the predetermined angular segments of one or more transmitting acoustic transponders, wherein at least one acoustic transponder from the plurality of acoustic transponders receives for the subsequent predetermined duration of the echo time, the acoustic signal from the borehole wall or the borehole casing string. In this case, the absence of the received reflected acoustic signal during the subsequent predetermined duration of the echo-time indicates the presence of the lateral branch.
EFFECT: increase of the measurements reliability by increasing the device resolution.
22 cl, 10 dwg
