Companies will need to invest $641 billion over the next two decades in pipelines, pumps and other infrastructure to keep up with the gas, crude oil and natural gas liquids flowing from U.S. fields, according to a study released Tuesday. The analysis, prepared by ICF International for two natural gas advocacy groups, predicts that $30 billion worth of new midstream infrastructure will be needed each year through 2035 — essentially triple the $10 billion in average annual investments over the past decade. “We’re in a heavy growth period right now, said Kevin Petak, an economist with ICF who authored the...