Subsea flowlines are used for the transportation of crude oil and gas from subsea wells, manifolds, off-shore process facilities, loading buoys, S2B (subsea to beach), as well as re-injection of water and gas into the reservoir. Achieving successful tie-in and connection of subsea flowlines is a vital part of a subsea field development.
- Vertical Tie-in
Vertical connections are installed directly onto the receiving hub in one operation during tie-in. Since the Vertical Connection System does not require a pull-in capability, it simplifies the tool functions, provides a time efficient tie-in operation and reduce the length of Rigid Spools. Stroking and connection is carried out by the the Connector itself, or by the ROV operated Connector Actuation Tool (CAT) System.
Vertical Tie-in
Source: FMC Technologies Subsea Tie-in Systems.
- Horizontal Tie-in
Horizontal Tie-in may be used for both firstend and second-end tie-in of both flowlines, umbilicals and Jumper spools. The termination head is hauled in to the Tie-in point by use of a subsea winch. Horizontal Tie-in may be made up by Clamp Connectors operated from a Tie-in tool, by integrated hydraulic connectors operated through the ROV, or by non-hydraulic collet connectors with assistance from a Connector Actuation Tool (CAT) and ROV. Horizontal connections leave the flowline/ umbilical in a straight line, and is easy to protect if overtrawling from fishermen should occur.
Horizontal Tie-in
Source: FMC Technologies Subsea Tie-in Systems.
Each tie-in and connection point require some form of subsea base structure. This base may be on a single well structure, a template, a manifold, or other individual structure such as a Riser Base, a Pipeline End Manifold (PLEM), a Pipeline End Termination (PLET) or an In-line Tee.
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