CORRECTED-U.S. oil drillers cut rigs for a 6th week in 7 -Baker Hughes

(Adds dropped numbers in second paragraph, corrects total number of rigs cut since summer to 136 from 134) Dec 31 (Reuters) - U.S. energy firms cut oil rigs for a sixth week in the last seven, data showed on Thursday, a sign drillers were still waiting for higher prices before returning to the well pad. Drillers removed 2 oil rigs in the week ended Dec. 31, bringing the total rig count down to 536, oil services company Baker Hughes Inc said in its closely followed report. That dec