The weekly estimate of commercial crude oil inventories in the U.S. Department of Energy’s Weekly Petroleum Status Report — and the week-on-week change in those inventories — are among the most closely watched numbers in the oil sector. And for good reason. After all, the numbers help the market assess shifts in the supply/demand balance, a critical consideration in determining crude oil prices and signaling the need for more — or less — imports, exports, and of course production. In 2017, with a mandated drawdown in the Strategic Petroleum Reserve, it is now important to track weekly withdrawals from the SPR as well because of the effect they can have on commercial stocks. Today we discuss recent and planned SPR drawdowns and their effect on the supply/demand balance and crude oil prices.