Canadian operator PentaNova Energy subsidiary Alianza Petrolera was reported on 9 January 2018 to have acquired the 54% interest from Argentine operator Roch for the 269 sq km Rio Deseado Este I exploration block and the 52 sq km Sur Rio Deseado Este II production concession in the southern San Jorge basin. The development block has 7 wells, some of them in production. In August 2017, Pentanova reported the completion of the acquisition of Patagonia Oil Corp, including Alianza Petrolera. Through the Alianza transaction, Pentanova acquired 29% of the Neuquen Basin Llancanelo Block, partnering with YPF and an 18% fully carried interest on the Tecpetrol operated Estancia La Mariposa license in the San Jorge Basin. An additional working interest in Llancanelo also gave Pentanova a 50% stake in the block as reported by YPF in April 2017. This agreement also provides preferred rights to negotiate on the Llancanelo R Block 1 block held 100% by YPF. In July, Patagonia, as a Pentanova subsidiary executed a final deal to acquire and operate the former Kilometer 8 contract including the current San Jorge, Burmeister, Sol de Mayo and Stephenson blocks in the San Jorge Basin for total of US$ 12.5 million. In May it was reported to the Buenos Aires exchange that Patagonia had obtained approval to acquire the stake held by Roch in five blocks. Patagonia will get 20.28% of the 420 sq km Angostura, 367 sq km Rio Cullen and 1,183 sq km Las Violetas licenses, all in the Tierra del Fuego portion of the Austral Basin. Roch is the current operator of these licenses.
Alianza Petrolera has acquired the 54% interest from Roch for the Rio Deseado Este I exploration block (269 sq km) and for the Sur Rio Deseado Este II (52 sq km).