Roc Oil is immersed in a major offshore drilling programme at its D35 production asset off Sarawak, Malaysia.
The phase two infill drilling campaign covers 11 firm wells, which are being drilled using the Malaysian contractor Velesto Energy's jack-up rig Naga-4.
Velesto previously announced the estimated value of its contract was US$31 million.
The campaign is under way and will last until about next August.
