Herbert Smith Freehills has advised Hong Kong Stock Exchange-listed Brightoil Petroleum Holdings Ltd. on its $1.1 billion acquisition of the Chinese subsidiary of U.S. exploration and production company Anadarko Petroleum Corp.

Brightoil has purchased Anadarko’s Kerr-McGee China Petroleum Ltd., which owns stakes in two offshore oil blocks in Bohai Bay in northeast China. The deal was first announced last February and closed Aug. 8.