Electrical voltages and resistances measured to inspect metallic cased wells and pipelines
- Seattle, WA
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.
- Research Organization:
- ParaMagnetic Logging, Inc. (Bothell, WA)
- DOE Contract Number:
- FG06-84ER13294
- Assignee:
- Western Atlas International, Inc. (Houston, TX)
- Patent Number(s):
- US 6249122
- OSTI ID:
- 873801
- Country of Publication:
- United States
- Language:
- English
Through Casing Resistivity Measurements And Their Interpretation For Hydrocarbon Saturations
|
conference | April 2013 |
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Electrical voltages and resistances measured to inspect metallic cased wells and pipelines
Electrical voltages and resistances measured to inspect metallic cased wells and pipelines
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voltages
resistances
measured
inspect
metallic
cased
pipelines
earth
electrically
energized
current
voltage
measurement
electrodes
contact
interior
casing
mode
conducted
carrying
electrode
remote
located
surface
calibration
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third
vertically
position
determine
wall
thickness
location
collars
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methods
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energize
pipeline
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joints
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electrically energized
voltage measurement
measurement electrodes
current carrying
wall thickness
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resistances measured
metallic cased
electrical voltages
inspect metallic
similar method
calibration mode
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