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US 2014/0180591 A1Published application
Multi-Sensor Contamination Monitoring
AssigneeSchlumberger Technology Corporation
InventorsKai Hsu, Julian J. Pop, Kentaro Indo
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Abstract
A downhole sampling tool is operated to obtain formation fluid from a subterranean formation, which then flows through a flowline of the downhole sampling tool. Real-time density and optical density sensors of the downhole sampling tool are co-located proximate the flowline. Contamination of the formation fluid in the flowline is then determined based, at least in part, on the real-time density and optical density measurements obtained utilizing the co-located sensors.
Claims20
A method, comprising:
- conveying a downhole sampling tool within a borehole extending into a subterranean formation;
- operating the downhole sampling tool to obtain formation fluid from the subterranean formation;
- flowing the obtained formation fluid through a flowline of the downhole sampling tool;
- obtaining real-time measurements of the formation fluid flowing through the flowline, including:
- obtaining real-time density measurements via a density sensor of the downhole sampling tool;
- and
- obtaining real-time optical density measurements via a multi-channel optical sensor of the downhole sampling tool, wherein the density sensor and the multi-channel optical sensor are co-located proximate the flowline;
- and
- estimating actual contamination of the formation fluid flowing through the flowline based on the obtained real-time measurements.
6 more elements
An apparatus, comprising:
- a downhole sampling tool conveyable within a wellbore extending into a subterranean formation, wherein the downhole sampling tool comprises:
- a flowline conducting formation fluid obtained from the subterranean formation via operation of the downhole sampling tool;
- a plurality of co-located sensors proximate the flowline and including a density sensor and an optical density sensor;
- a multi-channel spectrometer comprising the optical density sensor;
- and
- a controller operable to estimate an actual contamination of the formation fluid flowing through the flowline based on real-time density and optical density measurements obtained via the plurality of co-located sensors.
3 more elements
Dependencies are inferred from the claim text.