OSLO, June 23 (Reuters) - Two Norwegian labour unions have signed new wage deals with oil service companies, the unions said on Thursday, preventing a strike among workers.

Some 646 members of the Safe and Industri Energi unions had threatened to go on strike at companies such as Schlumberger , Baker Hughes and Subsea 7 unless a deal was reached. (Reporting by Nerijus Adomaitis, editing by Terje Solsvik)