By NS Venkataraman*  It is reported that Oil and Natural Gas Corporation (ONGC) will infuse about Rs 15,000 Crore in Ongc Petro-additions Ltd (OPaL) as part of a financial restructuring exercise. ONGC currently holds 49.36 per cent stake in (OPaL), which operates a mega petrochemical plant at Dahej in Gujarat. GAIL (India) Ltd has 49.21 per cent interest and Gujarat State Petrochemical