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More than 2,000 contracted oil workers took part in a snap 24-hour strike on Thursday, affecting operations at one of Colombia's highest producing fields.
In a statement, national oil producer Ecopetrol said the stoppage halted 19 drilling rigs and maintenance activities at the La Cira-Infantas field in northern Santander department. Employees from 10 service companies took part in the strike, the company added.
La Cira-Infantas is one of Colombia's four biggest producing fields, contributing more than 45,000b to Ecopetrol's daily crude oil output.
The USO union, which organized the strike, said it sought "a favorable outcome to the demands of outsourced workers," without providing further details.
Ecopetrol said the union's claims lacked "constitutional and legal support", adding that it was taking measures to guarantee the continuity of operations.