Characterizing at least one property of a liner that lines a well

US8326539B2 · kind B2 · utility

Assignee

• SCHLUMBERGER TECHNOLOGY CORPORATION · US

Inventors

• Frank Morrison · Berkeley, US
• Edward Nichols · Berkeley, US
• Richard A. Rosthal · Richmond, US
• Hong Zhang · Richfield, US
• Luis E. Depavia · Orinda, US

Key dates

• Filing date: May 8, 2008
• Grant date: Dec 4, 2012
• Expiry date: Jan 26, 2030

Classification

• Technology area (CPC G): Physics
• CPC primary: G01V3/28
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Impedances of an electromagnetic (EM) coil positioned in a well lined with an electrically conductive liner are determined. The impedances correspond to plural frequencies of operation of the EM coil. Based on the impedances of the EM coil corresponding to the plural frequencies, an attenuation factor associated with the electrically conductive liner is determined.