Abstract: A method for synchronizing an actuation of a seismic source with at least one of an acquisition and storage of an acoustic wave by a seismic tool having steps of determining at least one of a drilling pause and a seismic measurement, transmitting a trigger signal to a tool controller, actuating the seismic source; receiving the trigger signal and recording seismic waves in a data storage medium.

Abstract: An ultrasonic estimating method and apparatus are presented for estimating a mud velocity in a casing including a transducer and adapted to be positioned inside the casing and displaced through the casing at a plurality of azimuth and a plurality of depths.

Abstract: An ultrasonic estimating method for estimating a mud velocity flowing into a casing by means of an ultrasonic estimating apparatus comprising a transducer and adapted to be positioned inside the casing and displaced through the casing at a plurality of azimuth and a plurality of depth, the method comprising the steps of: a) for a first depth and a first azimuth of the ultrasonic measuring arrangement: a1) emitting an emission ultrasonic wave towards the casing for exciting the casing with a sensibly normal incidence, a2) receiving a reflection ultrasonic wave reflected from the casing, a3) measuring a transit time Ti MES between the emitting step and the receiving step, a4) determining the casing thickness th1 for the first azimuth, b) repeating the emitting step a1), the receiving step a2), the measuring step a3) and the determining step a4) for the first depth and at least a second azimuth of the ultrasonic measuring arrangement, c) calculating an intermediate mud velocity value Vmud CALC based on the m