"[Raptor] is about 21km from Wabo station in the Gulf province and is accessible only by helicopter. All food, equipment, and workers have to be flown in and out." Source:2014 Interoil Health and Safety-1.pdf accessed from http://www.interoil.com/media/interoil-in-png-press/
"InterOil is also providing helicopters to provincial government officers who are working to assess the impact of the flood...InterOil has shipped emergency relief and medical supplies to a distribution centre in Wabo to help affected families." Source: July 9, 2014 Interoil Press Release: InterOil assists families affected by Purari River flooding.
Possible additional reason for delay: Both Wabo station and IOC helicopters necessary to supply at least Raptor are involved in flood relief efforts.