Weatherford (WFRD) shares rallied 6.5% in the last trading session to close at $88.5. This move can be attributable to notable volume with a higher number of shares being traded than in a typical session. This compares to the stock's 4.2% gain over the past four weeks.The surge can be attributed to an improving outlook for Weatherford’s oilfield services business, particularly in international and offshore markets where drilling activity has gained momentum in recent years. Ramp-up of drilling activity in L ...