The shale fields that propelled the U.S. energy boom are expected to take another step back next month as producers reduce costs in the midst of a bear market. Output from the prolific tight-rock formations, such as the Eagle Ford in southern Texas, will decline by about 92,000 barrels a day next month to 5.27 million, the Energy Information Administration said Monday. It’s the fifth straight month a slide is expected, after output more than tripled from 2007. Shale producers like EOG Resources Inc. have cut spending and reduced output after oil prices fell more than 20 percent from their 2015 peak in June, and remain down by more than half from a year ago. The number of rigs drilling for oil last week was 670, down from 1,609 in October, according to oil-field service company Baker Hughes Inc. “We’re certainly in the period where we should see the […]