It felt like opposite day as traders bid up the price of oil last week even as OPEC announced an increase in oil production that should have sent prices downward. The cartel decided it had room to move because of outages in Venezuela, Libya and Angola amounting to 2.8 million barrels per day (mbpd). The increase apparently wasn't as much as traders had expected.
Even though oil prices have drifted upward from the punishing levels of three years ago, OPEC is still interested in undermining the shale oil industry (properly called "tight oil") in the United States which it perceives as a threat to OPEC's ability to control prices. So, it is no surprise that OPEC has chosen to increase output in the wake of lost production elsewhere. OPEC does not want prices to reach levels that would actually make the tight oil industry's cash flow positive.
You read that correctly. The industry as a whole has been free cash flow negative even when oil was over $100 per barrel. Free cash flow equals cash flow from operations minus capital expenditures required for operations. This means that tight oil drillers are not generating enough cash from selling the oil they're currently producing to pay for exploration and development of new reserves. The only thing allowing continued exploitation of U.S. tight oil deposits has been a continuous influx of investment capital seeking relatively high returns in an era of zero interest rate policies. Tight oil drillers aren't building value; they are merely consuming capital as they lure investors with unrealistic claims about potential reserves. (Some analysts have likened the situation to a Ponzi scheme.)