Crude oil dropped more than 2% on Friday’s trading

The bigger-than-expected increase in U.S. crude oil inventories last week sent prices falling by more than 2% on Friday, creating a weekly plunge of more than 4%.

Plus, there was the issue of declining Chinese demand for crude oil.

West Texas Intermediate fell $1.68 or 2.45% per barrel to close at $67.02 on the New York Mercantile Exchange.

Global standard Brent crude finished down $1.52 or 2.09% to finish at $71.04 per barrel.

Natural gas rose 4 cents for a 1.36% gain to $2.82.

Oklahoma energy stocks finished the week with a day of losses including nearly 8% for Mammoth Energy and 6% falls for both Empire Petroleum and Canoo.