Petro River, which focuses on oil assets in Oklahoma and Kansas, had agreed in July 2014 to effectively sell a 51% stake in Spyglass Resources to Sichuan Renzhi Oilfield Technology Services, a Shenzhen-listed company.

Houston-based Petro River had bought Spyglass earlier in 2014. The stake would have been sold through a subsidiary called PO1, set up to own the majority interest in Spyglass.

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