TEHRAN, June 13 (Shana) Managing director of the Iranian Offshore Oil Company (IOOC) said the company has positioned a rig over Esfand oilfield near Sirri Island in Persian Gulf waters, to raise oil and gas recovery from the field by drilling or repairing a number of shunt-in wells. Saeid Hafezi said the rig, dubbed as DD4 Rig, was successfully ...