Applications

• Assesing donwhole flowrate

Sample Logs

Tool Schematic

Mathematical Model

f^{+}_{FBS}(z) = S^{+}_{\rm slope} \cdot ( v_{\rm FLOW}(z) - v^{+}_{LSPD}(z) - v^{+}_{th})

f^{-}_{FBS}(z) = S^{-}_{\rm slope} \cdot ( v_{\rm FLOW}(z) - v^{-}_{LSPD}(z) - v^{-}_{th})

where  is some constant depending on tool construction and well completion ,  a critical value of the flow speed which can initiate spinner rotation,  – flow velocity.