Libya’s oil production ended April at about 760,000 b/d, up 50% from just over 500,000 b/d at the end of March, and the highest output since early December 2014. But such is the volatility of crude output in Libya that average production for the month of April as a whole, at 565,000 b/d, was the lowest since October 2016.

The late April hike in output was thanks to the re-opening of the Sharara and El Feel (Elephant) fields in the far southwest of the country, according to Mustafa...