EFFECTS OF A MUDCAKE ON STONELEY WAVES IN A FLUID-FILLED POROUS FORMATION AROUND A BOREHOLE
A.V. Sineva, E.I. Romenskya,b, and V.N. Dorovskya
aBaker Hugues, Russian Science Center, ul. Kutateladze 4A, Novosibirsk, 630128, Russia
bSobolev Institute of Mathematics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Koptyuga 4, Novosibirsk, 630090, Russia
Keywords: Stoneley waves, permeability, mudcake
Pages: 823-828
Abstract
A mudcake formed on the borehole wall between a fluid-filled porous formation and the borehole fluid can affect Stoneley wave propagation used to estimate the formation permeability. The mudcake effect on the permeability dependence of radial oscillations of borehole fluid is investigated in a system with a source generating radial acoustic waves in the borehole and hydrophones (pressure sensors) that record the respective attenuating oscillations of the borehole fluid. The permeability of the porous formation is estimated from theoretical permeability dependence of the attenuation exponent, knowing the time dependence of the exponential attenuation of borehole fluid oscillations.
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