The U.S. shale business may need simply acquired an enormous windfall with the nine-month extension of the OPEC cuts. Shale output was already anticipated to return roaring again this yr, however the extension of the cuts supplies much more room out there for shale drillers to step into. The sky is the restrict, it appears. Nevertheless, there are rising indicators that the U.S. shale business might be reaching the top of the low-hanging fruit. Or, extra particularly, drilling prices are beginning to rise and the big leaps in manufacturing that may be obtained by merely…