LWD borehole images/dips aid offshore California evaluation
- Schlumberger Wireline and Testing, Montrouge (France)
Quantitative, fullbore, azimuthal resistivity images of the borehole wall, acquired while drilling, can reveal large-scale structural bedding, fractures, faults, unconformities and other useful geologic events. While these images cannot resolve fine structural features or stratigraphic details, they can help identify those intervals requiring higher resolution wireline logging after drilling, and can be used to calculate general structural dips prior to wireline image/dipmeter runs. These images and dips have proven useful for time-critical drilling decisions and for subsequent geological interpretation and formation evaluation. This article presents discussions on: data acquisition at the bit with the Resistivity-at-the-Bit (RAB) tool, including tool functions and depth control, specific benefits derived from while-drilling resistivity images in two offshore California wells, and a favorable RAB outlook including a new RAB method for calculating high angle dips.
- OSTI ID:
- 242231
- Journal Information:
- World Oil, Vol. 217, Issue 4; Other Information: PBD: Apr 1996
- Country of Publication:
- United States
- Language:
- English
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