Natural gas prices rose Thursday, flipping up from losses after data showed a larger-than-expected drain from storage last week. The U.S. Energy Information Administration said natural-gas stockpiles shrank by 243 billion cubic feet in the week ended Friday. Analysts and traders surveyed by The Wall Street Journal forecast a drain of just 229 bcf and the five-year average for this week of the year is just 170 bcf. The report…