FIELD: mining.
SUBSTANCE: invention is designed to indicate velocity of ultrasonic pulse (UP) in drill mud (DM) under downhole conditions. Two ultrasonic generators (USG) are located next to each other so that the front surface of the first USG is shifted from the front surface of the second USG by predefined radial distance of shift. Thereafter, UP radiation in DM inside the well is carried out by using the first USGM (ultrasonic generator mud); UP, after it has passed the defined distance (d), is indicated. Then, time (t) required for UP to run the distance (d), is defined. The indicated distance (d) and time (t) of passing are used to define ultrasound propagation velocity. The gear for implementing the method includes two USGs disposed on a logging arrangement and a diagram to control time of UP actuation radiated by the first or the second USG or by the two USGs simultaneously as well as to measure time intervals between radiation of ultrasound and detection thereof after it had covered the distance (d).
EFFECT: more accurate evaluation of ultrasonic pulse velocity under downhole conditions; possibility to define drill mud specification.
10 cl, 10 dwg
