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DeploymentBorehole
Log NameCAP
Measured PropertyFluid capacitance
Sensor TypeCapacitor
Units
SIHz 
Oil MetricRPM  = 60 Hz
Oil Field

RPM  = 60 Hz


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Applications


  • Assesing donwhole flowrate


Sample Logs



Tool Schematic


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Mathematical Model



LaTeX Math Block
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ILSCAP = S_{\rm slope} \cdot ( v - v_{th})CAP_w s_w + CAP_o s_o + CAP_g s_g

where 

LaTeX Math Inline
bodyS_{\rm slope}
 is some constant depending on tool construction and well completion
s_w + s_o + s_g = 1
 – volumetric fractions of water, oil and gas phase, 
LaTeX Math Inline
bodyv_{th}
 a critical value of the flow speed which can initiate spinner rotation, 
LaTeX Math Inline
bodyv
 – flow velocity
\{ CAP_w , \ CAP_o , \ CAP_g \}
 – are reference values for capacitance of water, oil and gas at given temperature and pressure.