Schlumberger

Pulsar Multifunction Spectroscopy Service

Complete cased hole formation evaluation—including TOC for unconventional reservoirs—and reservoir saturation monitoring from a single tool

Pulsar multifunction spectroscopy service pairs multiple detectors with a high-output pulsed neutron generator to provide stand-alone cased hole formation evaluation and reservoir monitoring with openhole logging quality. No longer are operators limited in understanding their reservoir rock and fluid content for optimizing completion design and maximizing production.

Unlike conventional cased hole logging, no openhole data input is necessary to obtain a high-resolution volumetric petrographic interpretation, so rigless well logging can be conveniently conducted without disrupting drilling operations. Logging a well after it has been cased also negates well instability risks—especially in laterals and shale reservoirs.

Better data—and faster than previously possible

The high neutron output and improved acquisition accuracy of Pulsar service significantly increase logging speed and measurement precision in obtaining

  • suite of self-compensated traditional cased hole measurements: sigma, porosity, carbon/oxygen ratio
  • expanded set of elements including total organic carbon (TOC)
  • new fast neutron cross section (FNXS) measurement that differentiates and quantifies gas-filled porosity from liquid-filled and tight zones.

Saturation determination in all well and reservoir environments

Because Pulsar service does not depend on conventional resistivity-based approaches to rock and fluid identification, it accurately determines saturations in any formation water salinity, and it can be deployed across a wide range of well conditions:

  • mineralogy, lithology, and fluid content profiles at any well inclination: horizontal, deviated, and vertical
  • hydrocarbon identification in low-resistivity pay
  • corrosion-resistant and NACE MR0175–compliant housing
  • unlimited operation time for the 1.72-in-diameter tool at up to 175 degC without a flask.

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One-Run Cased Hole Differentiation of Gas Zones

Pulsar service log  confirmed zone of gas-filled porosity and identified gas accumulation.
Pulsar service’s unique FNXS measurement corrects misidentified gas-filled porosity from tight carbonate and liquid-filled porosity. Read case study