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7th Middle East Geosciences Conference and Exhibition
Manama, Bahrain
March 27-29, 2006
1 Production Domain Champion, Schlumberger, 20 Queens Den, Aberdeen, Ab15 8BW, United Kingdom,
phone: 44 1224 7717346128, [email protected]
2 Geosciences, Total E&P UK PLC, Crawpeel Road,
Altens, Aberdeen, United Kingdom
The keys to proactive production and reservoir management are production logs that profile fluid entries and diagnose
problems in producing wells. Designing optimal production strategies and remedial operations requires high -confidence
diagnosis. Production logging in deviated wells producing mixtures of various phases is challenging because of complex
flow regimes. This is further complicated by fluid recirculation in the wellbore, causing the heavier phase to fall back towards
the bottom of the wellbore, resulting in negative velocity
on the low side. In this paper we present a field example that uses
a new compact, integrated production-logging tool that incorporates the latest technological advances and best practices to
address complex production-logging requirements. We also present the logging results in similar wells during the same
campaign that were logged with a conventional production services platform tool. We are able to demonstrate the added
value in terms of comprehensive flow diagnosis. A production logging operation
using
the new tool, which specializes in
horizontal and deviated well logging, was planned to obtain key inputs for the reservoir model and investigate reasons for
low well productivity. The well was producing from multiple horizons, and it was critical to obtain an accurate flow profile and
infer the extent of depleted layers in the field. Production logs from the new tool resulted in accurate flow diagnosis and led
to better understanding of complex flow mechanisms across multiple producing zones. Future steps after this logging
operation include re-perforation and hydraulic fracturing of selected intervals. The tool provides a recording of holdup and
velocity
profiles along the vertical diameter of the borehole cross-section. The direct measurement of the
velocity
and fluid
holdup profile enhances the capability of the analyst to determine the downhole phase.