ILS (In-line Spinner Logging Tool)

Deployment	Borehole
Log Name	ILS
Math Symbol	$\begin{array}{l}f_{ILS}\end{array}$
Measured Property	Fluid flow velocity along the tool
Sensor Type	Mechanical Spinner
Units
SI	Hz
Oil Metric	RPM = 60 Hz
Oil Field	RPM = 60 Hz

Applications

Assesing donwhole flowrate

Sample Logs

Tool Schematic

Mathematical Model

$\begin{array}{l}\displaystyle f_{ILS} = S_{\rm slope} \cdot ( v - v_{th})\end{array}$

where $\begin{array}{l}S_{\rm slope}\end{array}$ is some constant depending on tool construction and well completion , $\begin{array}{l}v_{th}\end{array}$ a critical value of the flow speed which can initiate spinner rotation, $\begin{array}{l}v\end{array}$ – flow velocity.

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ILS (In-line Spinner Logging Tool)

Applications

Sample Logs

Tool Schematic

Mathematical Model