Latin America-focused operator Vista Oil & Gas and Swiss commodity trading group Trafigura have signed a new deal to further expand their operations in the Vaca Muerta shale formation in Argentina.

The two companies in June inked an agreement that called for a joint investment worth $250 million for the drilling of 20 wells in the Bajada del Palo Oeste field in the Neuquen basin.

As part of the new deal, Trafigura will gain contractual rights over 25% of the hydrocarbons production from three pads in Bajada del Palo Oeste.