To determine velocity we made use of sophisticated speedometer measurements tracking down the acoustic signal reflected from down-hole tubing couplings.
Main objective of this paper is to evaluate results of collected sample data in the attempt of a field-wide research-campaign eager to precisely locate the dynamic level and simultaneously identify the acoustic wave velocity within the annular gas. When defining the liquid level, inaccuracies simply arise from the fact that wrong specifications are chosen for the acoustic wave velocity that is later on used in the interpretation of recorded measurements.
Key words: liquid level, gas acoustic wave velocity, bottomhole pressure.
Abundant errors are analyzed at interpretation of centrifugation data and the method raising reliability of treating of these data is tendered. Advancing of the method envisioning increase of initial stress in core holder of a centrifuge is offered.
