Subsea Modular Injection System - Life of Field | OneSubsea


Subsea modular injection system

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The field-proven OneSubsea subsea modular injection system (SMIS) was the first of its kind to complete riserless hydraulic access intervention in Malaysia.

SMIS is a hydraulic intervention package that combines an injection conduit of openwater coiled tubing with a subsea injection skid or barrier package, complete with dual-barrier valves, integral fail-safe control system, and weak-link connector.

The subsea injection skid can interface with any subsea interface via the MARS multiple application reinjection system or a dedicated interface. A flexible jumper between the subsea injection skid and the subsea interface minimizes risk to the host structure.

The single, large-diameter coiled tubing conduit design is simple to manage and enables an increased flow rate. The use of larger-diameter coiled tubing in this application is made possible by the addition of several proprietary technologies that facilitate safe fatigue management while in service. A secondary circulation line is used in applications where required.

Subsea Modular Injection System
Subsea modular injection system
Subsea Modular Injection System

Broad range of applications

The system can be used for a variety of chemical injections, such as scale squeezes, acid stimulation, flushing applications, hydrate remediation, and well kill. It can be deployed on short notice as a rental service from a vessel of opportunity, delivering solutions efficiently and with lower intervention costs.

Efficiency-optimizing features

  • Rigless fluid injection
  • Modular system architecture
  • Highly flexible conduit design to suit a broad range of operating depths and dynamic conditions
  • Various available subsea interfaces, including MARS system choke access technology, which can be installed using standard running tools and procedures
  • Mudmat-landable subsea barrier package to reduce risk to the subsea architecture
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Specifications Working pressure 10,000 psi [68.9 MPa]
Specifications Water depth <6,560 ft [2,000 m]
Specifications Injection flow rate 16 bbl/min [2,900 L/min] at 10,000 psi
Specifications Technical features
  • 2-in through-flow diameter
  • Passive pressure-balanced weak link
  • Active disconnection and barrier control function
  • Fail-safe control system Riser circulation line, where required
  • Proprietary fatigue management technology
  • Proprietary MARS system interface technology
  • ROV operation
Specifications Interface architecture
  • MARS system choke technology
  • Dedicated intervention connector
  • Tree cap
Specifications Installation and deployment
  • Monohull vessel (moonpool or overboard)
  • Rig
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