Five wells have been drilled at the Corrib field and are ready for production. To drill a well more than 3000 metres below the sea bed, the semi-submersible rig drills section-by-section until it reaches the reservoir. When each section is complete, steel casing is installed and held in place with cement. This makes the well strong enough to withstand the pressure from the reservoir.

Each well will have a “christmas tree” on top of it. This is a structure that contains all the necessary equipment to control, monitor and shut off a well (similar to a tap). The “christmas trees” will be covered by a well protection structure to prevent snagging on fishing nets and to protect them from damage from any dropped objects.

The gas from each of the five wells is piped through individual sections of flexible flowlines to the production manifold where it is combined and co-mingled before being fed into the main pipeline for transport to shore.

The bundle of cables and small diameter tubes called the “umbilical” will carry electrical and hydraulic power to operate the sub sea controls. As the name suggests, this is the lifeline to the sub sea facilities and connects them to the onshore terminal. To protect the gas pipeline, the umbilical will also transport  an anti corrosion chemical and methanol (a type of “anti-freeze”) to the wellheads to mix with the gas and prevent “hydrates” (ice-like crystals) from forming in the pipeline.

During the operation phase, the sub sea facilities will be monitored and controlled 24 hours a day from the control room in the onshore gas terminal.

More in about us

Who we are

Learn about our business and people, and how we grew from a small shop in London nearly 200 years ago.

What we do

Shell is a global group of energy and petrochemical companies.

You may also be interested in


Shell provides energy in a responsible way, helping the world move towards a future in which the energy used causes minimal impact on the planet.


We aim to be a good neighbour wherever we work, by contributing to the well-being of nearby communities.


We are committed to delivering energy responsibly and safely, preventing harm to our employees, contractors, local communities and the environment.