Sept 12 (Reuters) - NuVista Energy Ltd
* NuVista Energy Ltd provides operational update and pipestone well test results
* NuVista Energy Ltd - reiterate production guidance ranges for Q3 at 26,000 to 29,000 boe/d and Q4 at 35,000 to 38,000 boe/d
* NuVista Energy Ltd - guidance for full year of 2017 is also unchanged at 28,000 to 31,000 boe/d Source text for Eikon: Further company coverage:
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