Go to Harbor Freight and get an extractor set, or the left handed drill bits. The extractor size you want should be slightly larger that the hollow portion of the remaining bolt.
Do not twist that thing clockwise. I like the left handed drill method, but it has the adverse effect of metal shavings. That will be bad for the oil pump, I believe it is before the filter. Flushing the oil sump with solvent is that horrible to do, though.