Effect of tool eccentricity on some electrical well-logging tools

Journal Article · Mon Jan 01 00:00:00 EST 1990 · IEEE Transactions on Geoscience and Remote Sensing (Institute of Electrical and Electronics Engineers); (USA)

DOI:https://doi.org/10.1109/36.45750· OSTI ID:7091180

Lovell, J R ^[1]; Chew, W C ^[2]

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1. Schlumberger-Doll Research, Ridgefield, CT (US)
2. Illinois Univ., Urbana, IL (USA). Dept. of Electrical and Computer Engineering

The authors present an algorithm to compute efficiently the propagation of nonaxially symmetric waves induced by realistic eccentered sources with a mandrel in a multicylindrically layered geometry. One of the applications of such a program is in electrical well logging, where oil exploration tools operate in a borehole drilled into the ground for geophysical subsurface sensing. The borehole surrounded by an invasion zone can be modeled as a multicylindrically layered geometry. The authors present an algorithm to study the effect of eccentricity (source and mandrel not in the center of the borehole) in the presence of concentric invasion zones around the borehole. The authors use their algorithm to study the eccentricity and invasion effects on an induction measurement and a dielectric logging measurement. In the case of dielectric logging, they find that the invasion zone may cause resonance effects, and that these effects remain when the tool is eccentered.

• OSTI ID: 7091180
• Journal Information: IEEE Transactions on Geoscience and Remote Sensing (Institute of Electrical and Electronics Engineers); (USA), Vol. 28:1; ISSN 0196-2892
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
03 NATURAL GAS
47 OTHER INSTRUMENTATION
EXPLORATORY WELLS
WELL LOGGING EQUIPMENT
COMPUTER CALCULATIONS
CUTTING TOOLS
DIELECTRIC MATERIALS
ELECTRIC LOGGING
EQUATIONS
GEOMETRY
WAVE PROPAGATION
EQUIPMENT
MATERIALS
MATHEMATICS
TOOLS
WELL LOGGING
WELLS
020200* - Petroleum- Reserves
Geology
& Exploration
990200 - Mathematics & Computers
030200 - Natural Gas- Reserves
Geology
& Exploration
440400 - Well Logging Instrumentation