U.S. drillers added oil rigs for a 14th week in a row, extending an 11-month recovery that is expected to boost U.S. shale production in May in the biggest monthly increase in more than two years. Drillers added five oil rigs in the week to April 21, bringing the total count up to 688, the most since April 2015, energy services firm Baker Hughes Inc said on Friday. That is more than double the same week a year ago when there were only 343 active oil rigs. U.S. crude futures dropped below $50 a barrel on Friday, for the first time in two weeks and putting it on track for its biggest weekly loss in six weeks, due to doubts the OPEC-led production cut will restore balance to an oversupplied market, especially as U.S. drillers keep producing more oil. [O/R] U.S. shale production in May was set for its […]