Energy workers went on strike on Thursday at three oil fields in Argentina 's Santa Cruz province, which produces about 20% of the country's crude oil, according to reports.
The protest over internal union politics was launched by the Santa Cruz Private Oil and Gas Workers' Union, Reuters reported.
"The strike is for an indefinite amount of time. Workers ... are asking for elections to be held," Ruben Retamoso, a union representative, told the news wire.
The strike was launched at the Canadon Seco, Pico Truncado and Las Heras fields, affecting state-controlled Argentine company YPF, China's Sinopec Group, and Pan American Energy (PAE), in which BP has a 60% stake.
Officials at YPF declined to comment on the strike to the news wire, while at the Buenos Aires offices of Sinopec and PAE, no one was immediately available to comment.