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Case Study: While-drilling Visualization of High-resolution Resistivity Images Targets Well Placement in Nigeria

Real-Time Imaging and Dip Interpretation Improve Drilling Accuracy

Challenge
Precisely placing a 1,400-ft horizontal wellbore in a difficult 6-ft-thick sand interval in Nigeria.

Solution
While-drilling visualization and dip interpretation of real-time resistivity images using the WellEye three-dimensional borehole data viewer and the GVR geoVISION resistivity sub.

Results
The resulting interpretation of the geological marker beds and dips provided accurate real-time geosteering guidance. The true structural dip was revealed to keep the well in the target sand at 3.2 ft TVD deeper than expected.

Accurate well positioning in difficult drilling environment
While-drilling visualization and dip interpretation of real-time resistivity images were the key to precisely placing a 1,400-ft horizontal wellbore in a 6-ft-thick sand interval in Nigeria. The loose sand promised to be a difficult drilling environment, and there was no sand marker in 130 ft of TVD above the target sand.


Powerful visualization at the wellsite
These challenges were easily met by using the WellEye three-dimensional borehole data viewer to visualize and analyze real-time, high-resolution resistivity images from the GVR geoVISION resistivity sub. User-friendly WellEye software operates on a personal computer (PC) at the wellsite to provide 2D and 3D interactive displays of the borehole along the well trajectory. The interpreter can readily visualize the spatial position of log features on the dynamically linked displays.



WellEye functionality includes interactive dip picking and classification and manual scaling of images, features that previously were not available at the wellsite for while-drilling interpretation.

Accurate real-time interpretation of geological marker beds and dips
The resulting interpretation of the geological marker beds and dips provided accurate real-time geosteering guidance. The true structural dip was revealed to keep the well in the target sand at 3.2 ft TVD deeper than expected. The real-time image and dip data also made it possible to extend the planned 1,200-ft lateral section by an additional 200 ft.

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