Halliburton has laid off 350 workers in Oklahoma as the squeeze of oil prices on the industry forces companies to shrink their operations. The Houston Chronicle reported the layoffs citing a filing with the state employment watchdog, and Halliburton later confirmed it. "This was a difficult decision, but is a necessary action as we work to successfully adapt to challenging market conditions," Halliburton said in a statement. "As we make workforce reductions,…