Oil output from the Permian Basin will expand in November and December, marking the region’s longest run of monthly gains in two years.

The world’s most productive shale patch is expected to pump a record 5.98 million barrels a day in December. In total, US crude output from the seven biggest shale regions will total 9.65 million barrels a day next month, essentially flat compared to November’s rate, according to a report from the US Energy Information Administration.