These energy stocks have insulated much of their business from oil price volatility. Oil prices are notoriously volatile. Over the past year, they have gone from a peak above $90 a barrel to a low point in the$60s. That volatility can have a significant impact on the earnings produced by oil companies. However, some oil stocks are much less susceptible to the ebbs and flows of crude prices. Midstream giants Enterprise Products Partners (EPD -0.17%), Oneok (OKE 0.47%), and Enbridge (ENB -0.03%) stand out to ...