Schlumberger Technology Corporation

James Lee Hemingway

Ronald E Plasek

Laurent Mosse

Stephen Thomas Grayson

A downhole tool is conveyed within a wellbore extending into a subterranean formation, and then utilized to obtain measurements at multiple different depths of investigation within the subterranean formation relative to the wellbore. The obtained measurements are then compared to assess mobility of oil within the subterranean formation.

Subterranean formation oil mobility quicklook

The invention relates to techniques, such as a system for generating a density of a cased wellbore. The system includes at least one downhole tool deployable into the cased wellbore, a radiation source supportable by the downhole tool for passing radiation through the subterranean formation, at least one detector supportable by the downhole tool for measuring the radiation, and a measurement tool for generating at least one apparent density log from the measured radiation. The measurement tool has at least one quality indicator tool for generating at least one quality indicator and for generating at least one compensated density log based on the apparent density log and the quality indicator whereby error is removed therefrom.

System and method for generating density in a cased-hole wellbore

A method for determining a characteristic of an earth formation traversed by a borehole precisely monitors the hydrocarbon saturation change during production of an oil field. For an initial logging pass, inelastic gamma ray spectra are detected in response to neutrons irradiating the formation and materials in the borehole. An energy window is selected to provide a carbon/oxygen ratio (COW) for determining a volume of oil. A carbon/oxygen ratio is also extracted from the inelastic energy spectra (COR) for determining a volume of oil. The linear correlation between the COW determined volume of oil and the COR determined volume of oil is used to derive a baseline .alpha.. For a subsequent logging pass, inelastic gamma ray spectra are detected and an energy window is selected to provide a subsequent carbon/oxygen ratio (COW') for determining a subsequent volume of oil. Baseline .alpha. is added to the subsequent volume of oil to improve the precision of the measurement.

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Houston, TX, United States of America

James Lee Hemingway