MANILA (AFX-ASIA) – PNOC Exploration Corp, a unit of state-owned Philippine National Oil Co, said it may invest US$70-80 million in a US$100-million natural gas pipeline project stretching from Batangas province to Manila. PNOC-EC president Rufino Bomasang said the PNOC board has allowed the unit to choose its financial advisor from a shortlist of three…