BP Plc and Eni SpA are considering merging their Angolan oil, gas, and liquefied natural gas assets into a joint venture in a bid to revive output following years of decline. The companies’ Angolan assets together produce more than 200,000 barrels of oil equivalent a day, BP and Eni said in a statement on Wednesday. Merging them would bring “significant opportunities” to “boost future developments” and increase investment in the basin, they said.