More corrosion found on Troll C

by on November 16, 2012 1:17 pm BST

It will be “a few days” before the Norwegian oil major is even able to give an estimate as to how long production will remain shut in at the Troll C facility following the earlier corrosion discovery.

Statoil revealed on Thursday that it had halted production at the semi-submersible platform after a scheduled inspection unearthed corrosion in the auxiliary system for gas treatment. This led the company to begin tests on a similar tank in a parallel gas treatment system.

A Friday statement read: “Statoil has now inspected the other tank in a parallel gas treatment system on the platform, and corrosion has been found there as well.

“Work is now being done to qualify the repair method and scope of work on the tanks. In a few days we will be able to give more information about the expected duration of the production stop.”

Statoil insisted that corrosion under insulation “is a well-known problem which is handled in scheduled inspection programmes”.

The company said on Thursday after the initial discovery: “An expert team has been formed to determine further action and work scope.”

Troll C has daily production of around 120,000 barrels of oil and 10.5 million cubic metres of gas, of which the Fram licence owns 50,000 barrels and 2 million cbm of gas.

It is a semi-submersible production unit on the Troll field, one of the largest natural gas fields in Norway which also has significant volumes of oil. Production from the platform started in 1999.

Statoil is operator of the field on 30.58% with Petoro on 56%, Shell on 8.1%, Total on 3.69% and ConocoPhillips on 1.62%.