Berlian Laju Tanker is going into battle against oilfield services ­giant Schlumberger in London over a smuggling case that left the master of one of its vessels under arrest in Thailand and facing a fine of up to $4m.

The Indonesian company said the captain is innocent and is ­being unfairly criminalised for something he had no control over.

While Berlian Laju has made securing the release of its master its first priority, it has also filed a case against Schlumberger in the High Court in London, seeking...