Oil prices were on track to sink into a bear market on Wednesday, falling more than 20% below their April peaks in another darkening sign for financial markets around the world. U.S. crude futures were recently down about 3.5% at $51.60 a barrel Wednesday, falling well below the $53.04 level needed to push oil into another bear market after government data showed a surge in domestic stockpiles. Prices had flirted with bear-market territory earlier in the week before closing above the price threshold. If Wednesday’s drop holds, this would be the third bear market for U.S. oil prices since th...