Iranian Oil Minister Bijan Namdar Zanganeh has sent official invitations to both companies.
It was noted that at the OPEC Vienna meeting in December, 2013, the Iranian Oil Minister invited the Norwegian Statoil, Italian Eni, French Total, the U.S. ConocoPhillips, ExxonMobil, Austrian OMV and Swiss Vitol companies to Iran.
Mehr news agency reported that Shell and BP owe $ 2 billion to Iran.