The world’s biggest private equity groups are investing in infrastructure assets of the national oil companies of the Middle East as Saudi Arabia and the United Arab Emirates (UAE) opened their pipeline networks to foreign capital. Private equity giants are now seeking a slice of the infrastructure assets of the international majors in deals that would give Big Oil funds to reinvest in oil and gas production. These days, amid lower oil prices and continued reluctance of public-market investors despite the dramatic shift in the ESG narrative,…