The drive to develop deep water discoveries has resulted in the introduction of subsea control systems for Completion and Intervention (CI) operations. Based upon the experience gained in operating similar systems in the exploration and appraisal phase, Expro developed large bore systems capable to deploy completions and conduct interventions in up to 10,000 ft of water. These systems do not only control the Expro Landing String Assembly (ELSA), but also operate and monitor all downhole functions for the tubing hanger, tubing hanger running tool, subsurface safety valve and other completion equipment.
The increased water depth has resulted in the use of dynamic positioned vessels during these operations which require a faster system response than what could be obtained with direct hydraulic systems. In addition the handling of the umbilical and reeler units that would be required in direct hydraulic mode in water depths over 6,000 ft on land and offshore can not be easily achieved.
The EXPRESS-CI system provides our clients with the functionality required to operate under these conditions in wells up to 10,000 psi. The subsea control system operates all functions Electro-Hydraulically and provides a separate multiplex data acquisition package which operates completely independent from the ‘simplex’ control system, thereby optimising system reliability. Full system redundancy is as a minimum provided on all safety critical functions. Another key benefit to the Expro ‘simplex’ Express system is the unique hydraulic over-ride function in the event of an electrical failure. This allows the operation and control of the safety critical functions thus ensuring a full system disconnect can still be achieved at all times.
EXPRESS – CI
The drive to develop deep water discoveries has resulted in the introduction of subsea control systems for Completion and Intervention (CI) operations. Based upon the experience gained in operating similar systems in the exploration and appraisal phase, Expro developed large bore systems capable to deploy completions and conduct interventions in up to 10,000 ft of water. These systems do not only control the Expro Landing String Assembly (ELSA), but also operate and monitor all downhole functions for the tubing hanger, tubing hanger running tool, subsurface safety valve and other completion equipment.
The increased water depth has resulted in the use of dynamic positioned vessels during these operations which require a faster system response than what could be obtained with direct hydraulic systems. In addition the handling of the umbilical and reeler units that would be required in direct hydraulic mode in water depths over 6,000 ft on land and offshore can not be easily achieved.
The EXPRESS-CI system provides our clients with the functionality required to operate under these conditions in wells up to 10,000 psi. The subsea control system operates all functions Electro-Hydraulically and provides a separate multiplex data acquisition package which operates completely independent from the ‘simplex’ control system, thereby optimising system reliability. Full system redundancy is as a minimum provided on all safety critical functions. Another key benefit to the Expro ‘simplex’ Express system is the unique hydraulic over-ride function in the event of an electrical failure. This allows the operation and control of the safety critical functions thus ensuring a full system disconnect can still be achieved at all times.