Well test subsea landing string electrohydraulic operating system
Verify subsea and downhole equipment functionality and integrity while monitoring downhole conditions.
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.
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.
We achieved maximum efficiency during the flow and buildup periods using real-time downhole data to accelerate management decision making, which saved rig time and costs.
Magdy A. Rezk, Laerte Duque, and Paula Castineira, Well Testing Team Repsol Exploration
Schlumberger also recommended the SenTURIAN E&A well test subsea landing string electrohydraulic operating system designed to run with Muzic wireless telemetry and subsea gauge carriers. This combination enables verification of subsea and downhole equipment functionality and integrity as well as monitoring of downhole pressure and temperature. The SenTURIAN system is the world’s first in-riser system designed and certified in accordance with IEC 61508 SIL 2 reliability specifications for safety-related systems. This provides reliable well control regardless of umbilical length, even under increased annulus pressure associated with ultradeepwater deployments.
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.
Challenge: Acquire real-time pressure transient well test data in an ultradeepwater environment while ensuring continuous communication with gauges installed below the packer