Speculation over burgeoning world oil supplies and unsubstantiated rumors about further rifts within OPEC helped push oil future prices to two-years lows, below $13-a-barrel.

On the New York Mercantile Exchange, the November contract for West Texas Intermediate plunged 47 cents Wednesday in heavy trading, settling at $12.60 a barrel. The benchmark U.S. crude had dipped to $12.28 barrel Wednesday.Crude-oil futures prices have not been this low since August 1986. A month ago, the near-term West Texas Intermediate contract had settled at $14.79.