Halliburton Co. , the world’s second-largest oil-field services company, said Tuesday it plans to shed up to 8% of its global workforce as low oil prices force energy companies to rein in spending . The job cuts could amount to 6,400 layoffs; the company says it has more than 80,000 employees around the world. “We are faced with the difficult reality that reductions are necessary to work through this challenging market environment,” the company said in an emailed statement. Halliburton said the job cuts aren’t related to its pending acquisition of oil field rival Baker Hughes Inc., which was announced late last year. In its statement Tuesday, the company didn’t specify where in the world the layoffs would take place but said they would affect its entire line […]