Wintershall Norway Perforates Interval Using eFire-TCP Firing Head Enabled by Muzic Wireless Telemetry | Schlumberger
Case Study
Norway, Europe, Onshore, Offshore

Challenge: Achieve real-time, accurate drillstem test (DST) data using wireless telemetry to monitor the well and activate the perforating guns

Solution: Run eFire-TCP tubing-conveyed perforating electronic firing head and Signature quartz gauges—both enabled by Muzic wireless telemetry—to obtain continuous transmission of downhole pressure, efficiently activate perforating guns, and monitor DST data


  • Activated the firing head quickly and efficiently using acoustic firing commands
  • Optimized perforations under optimal underbalance conditions
  • Confirmed perforating gun activation through downhole real-time pressure monitoring
  • Completed the industry’s first post-perforating activation through application of wireless telemetry
  • Verified successful use of wireless telemetry for multiple perforating operations
Products Used

Wintershall Norway Perforates Interval Using eFire-TCP Firing Head Enabled by Muzic Wireless Telemetry

Acoustic firing commands eliminate need for pressure pulse activation

Obtain real-time downhole pressure data during perforating operation

Wintershall Norway sought to achieve real-time downhole data transmission during perforating and DST operations. The complexity of well test operations requires real-time access to accurate bottomhole pressure data to monitor well performance, enable informed decision making, and optimize test duration. Real-time bottomhole pressure information is also valuable to help optimize pressure underbalance before perforating the well.

Design integrated solution featuring eFire-TCP firing head enabled by Muzic telemetry

Schlumberger recommended Wintershall Norway run the eFire-TCP firing head enabled by Muzic wireless telemetry, which combines two field-proven technologies into a single firing head—IRIS intelligent remote implementation system and Muzic telemetry.

Enabled by Muzic wireless telemetry, the eFire-TCP firing head allows the operator to trigger the perforating guns using acoustic signals compared with conventional technology that requires pressure pulse commands. The eFire-TCP firing head enabled by Muzic wireless telemetry does this by combining sensors, battery power, microprocessors, and control switches—replacing rupture discs, shear pins, and other mechanical activation devices, which require high overpressure or mechanical movement of the toolstring. Furthermore, the eFire-TCP firing head enabled by Muzic wireless telemetry allows the operator to achieve optimal underbalance conditions prior to firing the perforating guns.

Completed the perforating operation using wireless telemetry

Acoustic activation of the eFire-TCP firing head enabled the well to be perforated quickly and efficiently, eliminating use of pressure-pulse activation commands. Bottomhole pressure data delivered by the Signature gauges allowed for critical optimization of underbalance prior to perforating the zone.

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Schlumberger engineer preparing the wireless-enabled DST toolstring to run in hole.

After flowing the well at the end of the buildup, a second wireless firing head, located at the bottom of the same toolstring, was activated to test post-perforating shock functionality and acoustic communication across the perforating gun string. Wireless feedback and tool status received from the eFire-TCP firing head confirmed gun activation, and monitoring of bottomhole pressure confirmed successful perforation minutes later.

Real-time bidirectional communication enabled better informed decision-making and validation of objectives before ending the well test. The application of eFire-TCP firing head enabled by Muzic telemetry successfully activated the perforating guns through wireless commands. This eliminated the use of pressure pulse initiation, achieving Wintershall Norway's well test and perforating objectives.

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Real-time pressure history data optimizing precise initiation of firing sequence and validating perforation operation.
Products Used

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