Schlumberger’s downhole wireless Muzic

Petrobras trial shows fidelity of mud-pulse vs. memory data in deepwater well test.

Schlumberger has just released ‘Quartet’ a reservoir testing system using wireless telemetry (‘Muzic,’ what else!) to provide bi-directional downhole communications. Muzic uses mud pulses to transmit data to and from the test tool. For deepwater applications, repeaters are run in the test string to enhance signal to noise. The relatively low bandwidth offered by the mud pulse system is OK for well testing operations that last from days to weeks.

A deepwater well test trial for Petrobras in the presalt Santos basin compared real-time mud pulse data with data recorded on the test tool’s memory card. The real time data compared very well with the recorded data, even capturing short duration events such as the detonation of a tubing-conveyed perforating gun.

Schlumberger’s Sameh Hanna said, ‘When working in high-cost environments such as deepwater, it is important to be able to interact with downhole tools, manage wellbore events, validate and refine well tests in real time.’ The system enhances testing efficiency by making possible the isolation, control, measurement and sampling of the reservoir in a single run.

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