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Schlumberger introduced the Pulsar multifunction spectroscopy service at the Society of Petrophysicists and Well Log Analysts (SPWLA) 58th Annual Symposium. The new service provides the industry’s first complete cased hole formation evaluation and reservoir saturation monitoring with openhole logging quality.
This next generation in pulsed neutron logging features multiple detectors and a high-output pulsed neutron generator to reportedly improve acquisition accuracy and increase both logging speed and measurement precision. The Pulsar service measurements are complemented by algorithms delivering answers that compensate for variations in the borehole fluids and completions to make reservoir monitoring in complex conditions a reality.
The Pulsar service simultaneously obtains self-compensated traditional cased-hole measurements, an expanded suite of elements including total organic carbon (TOC), and the new fast neutron cross section (FNXS) measurement. Directly sensitive to the volume of gas in the formation, the FNXS measurement differentiates and quantifies gas-filled porosity from liquid-filled and tight zones without requiring any openhole data input.
The service has been run to successfully guide completions designs in more than 60 wells in all the major shale plays in North America. Worldwide, nearly 500 wells have been logged by the Pulsar service for reservoir monitoring and bypassed pay identification.
Keywords: Spectroscopy, Cased-Hole, Pulsed Neutron Logging, Reservoir Monitoring, ARC Advisory Group