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Cased collection

Schlumberger has introduced a spectroscopy service that the company says provides the industry’s first complete cased-hole formation evaluation and reservoir saturation monitoring with open-hole logging quality.

Schlumberger describes the Pulsar technology as the “next generation in pulsed neutron logging” featuring multiple detectors and a high-output pulsed neutron generator to improve acquisition accuracy and increase both logging speed and measurement precision.

Measurements are complemented by algorithms delivering “robust answers that compensate for variations in the borehole fluids and completions to make reservoir monitoring in complex conditions a reality”, the company says.

The Pulsar service simultaneously obtains traditional cased-hole measurements and an expanded suite of elements that includes total organic carbon and the new fast neutron cross section measurement, which differentiates and quantifies gas-filled porosity from liquid-filled and tight zones without requiring any open-hole data input.

Schlumberger has run the service to guide completions in more than 60 wells in the North American shale plays.

The service has been used in nearly 500 wells worldwide for reservoir monitoring and bypassed pay identification, the company says.