Obtain high-quality data during a deepwater well test

When operating offshore Brazil, Repsol Sinopec Brazil S.A. wanted to acquire real-time pressure transient well test data in an ultradeepwater environment (7,011-m well, at 2,840-m water depth, with 30.5° maximum deviation) while ensuring real-time wireless communication with gauges installed below the packer.

Monitor downhole pressure using Muzic wireless telemetry

Schlumberger engineers recommended Repsol Sinopec run Signature HP high-pressure quartz gauges enabled by Muzic wireless telemetry installed below the QUANTUM MAX HPHT graveland frac-pack packer to transmit real-time pressure and temperature data during the well test. Signature HP gauges provide valuable pressure and temperature information under the most extreme HPHT conditions.

Provided rapid wellbore isolation using electrohydraulic landing string system, saving 73 h of rig time and costs

The Signature HP gauges and Senturian E&A system—both enabled by Muzic wireless telemetry— allowed Repsol Sinopec to obtain real-time pressure measurements while monitoring and controlling the downhole reservoir test. During all phases of the operation, wireless communication was maintained with gauges installed below the packer, allowing for real-time pressure data verification and betterinformed decision making.

Communication was established between the subsea repeater and surface using Muzic wireless telemetry and the Senturian E&A system’s electrical umbilical cable. The SenTURIAN E&A system and SenTREE 3 subsea test tree provided a rapid-response well control solution for Repsol Sinopec’s testing campaign. When the wellsite was tested prior to deployment, the SenTURIAN E&A shut in and unlatched the SenTREE 3 tree in 8 seconds, narrowing any concerns regarding emergency well control at such great water depths.

Real-time downhole pressure monitoring during direct circulation helped the operator confirm the correct underbalance before activating the eFire-TCP tubing-conveyed perforating electronic firing head. All wireless data were communicated in real-time through the InterACT global connectivity, collaboration, and information service.