Petroleo Brasileiro SA halted drilling at its largest oil discovery in deep waters, two people with knowledge of the matter said, underscoring the technical challenges facing the company’s new management team. An unplanned procedure to retrieve equipment stopped work for more than a week at a well in Libra, the people said, asking not to be named because it hasn’t been made public. Rio de Janeiro-based Petrobras didn’t immediately respond to a request for comment on the incident and if it had been resolved. Commercial production is expected to start in 2020. While Petrobras expanded output to a record in December at the so-called pre-salt region that holds Brazil’s largest deposits, it has also run into drilling disruptions in the past. In 2010, it abandoned the first well it started at Libra, citing mechanical issues. In 2011, it briefly halted production at the Sapinhoa field in the […]