Rising Oil Prices Throw Lifeline to Shale Producers

LONDON, April 28 (Reuters) - Brent prices for 2017 ended trading above $50 per barrel on Wednesday for the first time since mid-December following the largest and most sustained rally in prices since the oil slump started. The average for the 12 futures contracts expiring in 2017, called the calendar strip, has risen by 34 percent from its recent low of $37.45 on Jan. 20 to $50.26 on April 27

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