Inside his downtown apartment, Whicker has lots of signs on his walls. "Pretty much all memories," Whicker said. He'd rather forget the Chevron signs. "I'm not really happy about it," Whicker said.

Chevron, the world’s second-biggest oil company signed the first agreement with Argentina’s government since it nationalized YPF in 2012 to help develop shale oil and natural gas in the Vaca ...