Schlumberger

Case Study: Accurate Three-Phase Quantification Using Flow Scanner System in a Horizontal Well

Downlog capability on MaxTRAC wireline tractor improves data quality, North Sea

Challenge: Acquire an inflow profile of a horizontal oil producing well in the Omega Nord structure to identify any significant differences in the reservoir pressure between the Middle and Lower Tarbert areas.

Solution: Log the multiphase flow using the Flow Scanner horizontal and deviated well production logging system conveyed on the MaxTRAC downhole wireline tractor system.

Result: Quantified three-phase flow with real-time monitoring to save three trips across the logging interval.

Profiling flow to plan intervention in a horizontal well

StatoilHydro required an inflow profile for a horizontal oil producing well in the Omega Nord structure. The well TD was 6,390 m MD with perforations in the Middle Tarbert 2 and Lower Tarbert. A total of 641 m has been perforated at three intervals.

A production logging profile in February 2004 revealed that the 30-m perforated section in the toe of the Lower Tarbert contributed to 68% of the total inflow of water cut. Four and a half years later, the production rate declined rapidly, and water influx was suspected. Although normal production was later resumed, a decrease in production shortly following shut-ins suggested possible water loading in the liner.

Seamlessly coordinating a complex operation

Because of the limited rig-up height, the toolstring for the Flow Scanner production logging system was deployed using three deployment bars. It took 30 hours to rig up and deploy the toolstring into the well, which demanded seamless coordination between the logging and rig crews.

In a total of three consecutive descents, the MaxTRAC tractor conveyed the Flow Scanner system toolstring to 6,040 MD.

Monitoring in real time

Data was available in real time for analysis through InterACT global connectivity, collaboration, and information service. This made it possible to monitor internal and tubular changes and compressions exerted on tools below the tractor while it was run in hole, to avoid equipment damage and tool sticking. The capability to record data against the flow while tractoring down the well improved data quality. Multiphase flow profile quicklook images from the inflow profiler aided data quality control.

The combination of MaxTRAC tractor conveyance and the Flow Scanner production logging system made it possible to

  • maintain constant logging speed
  • perform cumulative tractoring over 6,040 m
  • maintain proper Flow Scanner system orientation
  • log down passes in real time
  • identify water and gas entry points
  • obtain multiphase flow profile across the logging interval at multiple rates.

 


Download: Accurate Three-Phase Quantification Using Flow Scanner Toolstring in a Horizontal Well (0.28 MB PDF)

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