DETERMINATION OF THE AVERAGE SOUND VELOCITY IN THE ANNULAR SPACE OF A MECHANIZED WELL
T. A. Ishmuratov1, A. Ya. Davletbaev1,2
1LLC "RN-BashNIPIneft", Ufa, Russia
2Ufa University of Science and Technology, Ufa, Russia
Keywords: sound velocity, annular space, bottomhole pressure, phase transitions, gas composition, oil and gas properties
Abstract
A method is presented for estimating the average sound velocity in the annular space of a mechanized well, which is subsequently used to determine the gas-liquid interface (dynamic level). The proposed approach takes into account the distribution and variation of the gas composition, thermobaric conditions, and the presence of phase transitions. The key stage in solving the problem is determining the gas composition distribution from the wellhead to the gas-liquid interface. The approach is based on the laws of thermodynamics for equilibrium processes. The method has been tested on more than 100 wells across several oil fields in Western Siberia. The convergence of the analytical approach was verified by comparing its results with field experimental measurements of sound velocity obtained by echo sounding.
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