(Bloomberg) — The speed at which oil producers shut down wells spitting out their final drops of unprofitable crude may speed the drop in U.S. output and hold the key to an eventual rebound if prices fall further. Crude prices tumbling to $30 a barrel would threaten the profitability of about 206,000 barrels per day of production from older wells that produce minimal amounts of oil, according to a report Thursday from Bloomberg Intelligence. The wells, which are most prevalent in Texas’ Permian Basin, are about 25 years old on average and produce no more than 15 barrels a day. They require regular maintenance to help pump even that much after years of sagging pressure. "These wells dance on the edge of profitability," Peter Pulikkan and William Foiles, analysts at Bloomberg Intelligence, wrote in the report. "The reaction of smaller mom-and-pop operators to sustained low oil prices will dictate […]