Bullish flow detected in Ensco (ESV), with 5975 calls trading, or 3x the recent avg daily call volume in the name. Shares are up $3.28 to $44.06 on a good day for the oil drillers after crude rallied $2 to $73.92 a barrel. Oil Service HOLDRS (OIH) up nearly 5 percent. ESV is among the day’s biggest gainers (RDC, PDE, NE, NBR, and DO also seeing relative strength). In ESV options, the focus is on Sep 43, 44, 45, and 47 calls, as well as Oct 45 and 46 calls. Overall sentiment based on the total order flow is 59 percent Bullish.