Phasor-Induction SFL Tool

Borehole-Effects Correction for Accurate Thin-Bed Resistivity

The Phasor-lnduction SFL tool uses a conventional dual induction-SFL array to record resistivity data at three depths of investigation. In-phase (R-signal) induction measurements and induction quadrature signal (X -signal) measurements are combined with advanced signal processing to provide a log with thin-bed resolution down to 2 ft and fully corrected for shoulder effect. By adding borehole geometry measurement devices in the same toolstring, borehole effect can be corrected in real time. With these environmental effects removed, a real-time inversion of the data into a three-parameter invasion model can be performed at the wellsite.

Tool design improvements, X-signal measurements, Phasor processing, and borehole corrections provide more accurate resistivity values than other induction tools in all resistivity and bed thickness ranges and borehole conditions. The Phasor-lnduction SFL tool can be combined with other tools to save rig time by reducing the number of runs in the well.

Principal applications

• Thin-bed resolution
• Interpretation of deeply invaded formations
• True resistivity in medium- to high-contrast formations
• Correlation and reservoir modeling
• Invasion profiles