Schlumberger Introduces New Well Control System

Schlumberger Oilfield Services announced the availability of SenTREE HP (High Performance), which enables the well testing and completion of exploration, appraisal and development subsea wells in challenging environments.

SenTREE HP is latest addition to the market-leading SenTREE family of subsea completion and test trees that provide subsea well control during completion and well testing operations in subsea wells in water depths up to 10,000 ft. SenTREE HP has a large bore (6 3/8") and a working pressure rating of 15,000 psi.

"SenTREE HP delivers reliability and versatility, as it serves exploration, appraisal and the development well market," said Zaki Selim, president, Well Completions & Productivity (WCP), Schlumberger Oilfield Services.

Although primarily used in concert with horizontal subsea production Christmas tree technology in the development market, it can also be brought into service where conventional trees are the choice when the completion type and methodology permit.

Schlumberger is working with a major operator in the Gulf of Mexico on an extended well test where SenTREE HP will form a critical part of the subsea well control system.

To complement the SenTREE HP, the existing field-proven Commander* telemetry in-riser controls will be upgraded to match the SenTREE HP operating envelope. These Commander control systems provide a 15-second response time to shut in the well and disconnect the landing string regardless of water depth. Fourteen well completion and intervention operations in water depths up to 7,200 ft. already have been successfully completed. With three more systems on order, Commander telemetry controls represent the only field-proven equipment of its type.

"The combination of SenTREE HP and the upgraded commander controls will provide clients the technology and proven service capability that is required to develop the myriad of deepwater high-pressure prospects that will surface in the coming years in both the Gulf of Mexico and other parts of the world," said Selim.

SenTREE services are an integral part of the WCP completion offering and can be contracted in association with the well completion system and the surface well test or clean up package. By identifying clear lines of responsibility and by contracting complimentary technologies and services the planning and execution of such projects become more effective and efficient.