As previously reported, Societe Generale analyst Edward Muztafago made several ratings changes in the oil services space as he recommended rotating more fully into offshore and reducing U.S. land exposure. He views U.S. activity being poised for constrained growth following an anticipated recovery from "the current frac malaise," while believing offshore activity appears set to inflect, Muztafago tells investors. With that backdrop view, he upgraded Ensco (ESV), Noble Corp. (NE) and Oceaneering (OII), all to Buy from Hold, downgraded Halliburton (HAL) to Hold from Buy and lowered his rating on Weatherford (WFT) to Sell from Buy. Current U.S. challenges and the "stock market meltdown" create risk to Weatherford's asset divestiture plans that investors are so concerned about and "stumbles may not be well received," Muztafago stated.