CNBC | OPEC vs US shale showdown is biggest oil risk of 2017, says energy investor CNBC The biggest oil market risk for 2017 is the prospect of a market share war — or at least a showdown — between OPEC and U.S. shale drillers, said Kate Richard, CEO of energy investment firm Warwick Energy. Richard offered her view after U.S. crude ... Oil price crashes back towards $50 as Opec raises US oil forecasts Oil prices fall after Opec stocks rise Renewed oil sell-off rattles stock markets |