Santos will purchase a 14.3 per cent stake in PRL 3, which is owned by joint venture partners ExxonMobil, Oil Search and JX Nippon affiliate Merlin Petroleum Company. Following the company’s US$187 million (AU$270 million) purchase, Exxon will have a 36.86 per cent interest, Oil Search will have 36.86 per cent and Merlin will slide …