RockRose Energy agrees to acquire a 20.43% interest in blocks 23/11a, 23/16b and 23/16c from Dana Petroleum. : RockRose Energy announced Thursday that it has signed an agreement to acquire a 20.43 percent interest in blocks 23/11a, 23/16b, and 23/16c, which contain the Arran field in the UK Central North Sea, from Dana Petroleum (E&P) Ltd “for a nominal consideration”. Completion of the transaction is subject to Oil and Gas Authority and other partner consents. The transaction does not involve operatorship of the Arran development.