Oil prices have been edging higher this week, but there's not much OPEC+ can do to lift prices beyond this point, one energy expert said. That's because the US has been producing boatloads of oil, notching record levels of production and crude oil exports. "OPEC+ just can't cut enough to sustain a price much above where we are right now," John Kilduff from Again Capital told CNBC on Tuesday. West Texas Intermediate crude oil is trading at $75.94 a barrel, up from levels of around $73 last week.