| 摘要 |
<p>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 th i 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 measured transit time T i , the determined casing thickness th i , a diameter of the transducer DOT and a casing outer diameter OD for the first depth z-1, and for the first azimuth and at least the second azimuth, and
d) calculating an estimated second depth z mud velocity value Vmud_est KFCALC by applying an estimation method to the intermediate mud velocity value and an estimated first depth mud velocity value.</p> |
