Weatherford (WFT) loses $1.40 to $16.80 amid volatility in the drillers after crude oil lost another $3.36 to $83.52 per barrel. A noteworthy options trade in WFT today is an Aug 18 – Sep 17 call spread bought at 91 cents, 15000X. It might roll a position out one month and down 1 strike. Shares had performed well with help from upbeat earnings in July, but after a 17 percent slide last week, all those gains have been erased.