DEEP DIVE By Philip van Doorn A long-term investment could lead to gains of at least 100%, according to one money manager Transocean is among oil-services companies whose share have been hit especially hard over the past year. Getty Images Oil-stock investors sure are jittery these days, and they have been particularly brutal to oil-services companies over the past year. That group of stocks has fallen far more than the price of oil has, setting up what appears to be an opportunity for investors who can look beyond the next few months and stay committed for several years. Charles Lemonides,...