Case Study: EcoScope, PeriScope, and StethoScope Measurements Improve Production Rates

New LWD technology significantly reduces water cut for Pearl Oil

Challenge: Reduce early water breakthrough and determine reservoir connectivity.

Solution: Use EcoScope multifunction logging-while-drilling service, PeriScope bed boundary mapper, and StethoScope formation pressure-while-drilling service to geosteer within the sweet spot of the production zone and minimize water contact.


  • Extended Jasmine field life by at least 2 years.
  • Increased oil production with reduced water cut.
  • Improved understanding of reservoir connectivity, proving additional reserves.

Reducing early water breakthrough

Pearl Oil operates in the traditionally low-cost Gulf of Thailand. The reservoirs consist of a series of stacked sands of lacustrine and fluvial origin. Past development has relied mainly on deviated wells intersecting multiple targets. Gamma ray and resistivity were the only LWD measurements made in these production wells. High permeability resulted in good production rates, but early water breakthrough was common and expected.

Measuring to identify gas/oil contact

In late 2009, Pearl Oil ran the EcoScope service as its first new-generation LWD nuclear tool in development wells. The measurements were used to successfully identify the gas/oil contact and land a known distance under the gas contact.

Improving understanding of connectivity

The PeriScope bed boundary mapper was then introduced to help drill horizontally within a 6-ft-thick sand after using EcoScope images to optimize the landing. After 9 months of production, the oil rate was maintained, and water cut was significantly lower than the field average. A further advance was made with the introduction of the StethoScope service, using its pressures to monitor depletion and determine connectivity between individual sands. This combined approach, which was implemented in January 2011, has improved understanding of the 50 sands.

Download: EcoScope, PeriScope, and StethoScope Measurements Improve Production Rates (0.85 MB PDF)

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