Shell’s CEO Wael Sawan told CNBC the company is actively considering multibillion-dollar offshore natural gas investments in Venezuela that could start production in the next few years, pending regulatory approvals. The comments mark one of the clearest public signals yet that Shell is weighing a major push into Venezuelan energy assets after years of sanctions and uncertainty. The potential targets are offshore gas opportunities. Sawan said these projects could be activated within months, which is about as tight a timeline as Big Oil ever…