COSL has filed a civil action lawsuit against Norwegian operator Statoil after it terminated a drilling contract for one of its rigs in March this year.
The COSL Innovator rig has been under investigations by the Petroleum Safety Authority after a fatal incident in December 2015.
The firm is claiming difference between the two parties are yet to be resolved regarding the terminated contracts.
COSL has said it disagrees with Statoil’s decision to terminate the contract and has since filed a claim in the Oslo District of Norway.
In a statement the company said the termination was “unlawful”.
A spokesman said: “If the contract cannot be maintained, COSL has claimed that Statoil is obliged to cover COSL’s loss resulting from the unlawful termination, and the exact amount of damages will be subject to subsequent proceedings.”
In March COSL said it would have to reduce its headcount by 230 positions as a result of the contract termination.
However, Statoil has said the conditions for termination of the contract had been met.