CNBCOil storage in US close to running out: ProCNBCU.S. crude posted its first monthly gain since June on Friday, but one expert warned that storage in the United States is filling up quickly, and that could send oil lower. "We are really close," …

Oil fields at risk: Where the slowdown has begunCNBCU.S. oil production grew 49 percent between 2008 and 2013, as drillers improved productivity and tapped high-yield debt markets. But with their product fetching far less these days, exploration and produc …