Electrical voltages and resistances measured to inspect metallic cased wells and pipelines

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 6577144
APP PUB NO 20020016675A1
SERIAL NO

09813272

Stats

ATTORNEY / AGENT: (SPONSORED)

Importance

Loading Importance Indicators... loading....

Abstract

See full text

A cased well in the earth is electrically energized with A.C. current. Voltages are measured from three voltage measurement electrodes in electrical contact with the interior of the casing while the casing is electrically energized. In a measurement mode, A.C. current is conducted from a first current carrying electrode within the cased well to a remote second current carrying electrode located on the surface of the earth. In a calibration mode, current is passed from the first current carrying electrode to a third current carrying electrode located vertically at a different position within the cased well, where the three voltage measurement electrodes are located vertically in between the first and third current carrying electrodes. Voltages along the casing and resistances along the casing are measured to determine wall thickness and the location of any casing collars present so as to electrically inspect the casing. Similar methods are employed to energize a pipeline to measure the wall thickness of the pipeline and the location of pipe joints to electrically inspect the pipeline.

Loading the Abstract Image... loading....

First Claim

See full text

Family

Loading Family data... loading....

Patent Owner(s)

  • WESTERN ATLAS INTERNATIONAL, INC.

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Momii, Steven Thomas Mercer Island, WA 4 84
Vail, III William Banning Bothell, WA 44 1651

Cited Art Landscape

Load Citation

Patent Citation Ranking

Forward Cite Landscape

Load Citation