Tool for Imaging A Downhole Environment
AssigneeSchlumberger Technology Corporation
InventorAndrew J. Hayman
Life of this patent
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Abstract
The disclosure is concerned with a tool and method for imaging a formation through a substantially non-conductive medium. The tool includes one or more injection electrodes for injecting current through the substantially non-conductive medium and into the formation. The tool further includes one or more return electrodes for receiving current from the substantially non-conductive medium, the formation, or both. The tool also includes circuitry for determining a complex impedance based on the received current, determining a phase angle of the complex impedance, and determining a component of the complex impedance that is orthogonal to the phase angle.
Claims20
A tool for imaging a formation through a substantially non-conductive medium, the tool comprising:
- one or more injection electrodes for injecting current through the substantially non-conductive medium and into the formation;
- one or more return electrodes for receiving current from the substantially non-conductive medium, the formation, or both;
- circuitry for determining a complex impedance based on the received current, determining a phase angle of the complex impedance, and determining a component of the complex impedance that is orthogonal to the phase angle.
A method for measuring a component of an impedance of a formation through a substantially non-conductive medium, the method comprising:
- injecting a current in the substantially non-conductive medium and the formation;
- receiving the current returning from the substantially non-conductive medium, the formation, or both;
- measuring a total impedance based on the received current;
- determining a mud impedance of the substantially non-conductive medium based on the total impedance;
- determining a phase angle of mud impedance;
- and
- determining the component of the total impedance that is orthogonal to the phase angle of the mud impedance.
Dependencies are inferred from the claim text.