REUTERS

The American Petroleum Institute said crude stockpiles rose by 9.3 million barrels in the week to Oct. 28, more than nine times the amount expected by analysts polled by Reuters

U.S. West Texas Intermediate crude CLc1 fell 40 cents, or 0.9 percent, to $46.27 by 0337 GMT. On Tuesday it dipped 19 cents to $46.67. Brent crude LCOc1 was down 32 cents at $47.82, near a one-month low of $47.72 hit in the prior session.

Prices have slumped in recent days as hopes have faded that oil producers would settle their differences and agree to output cuts when the Organization of the Petroleum Exporting Countries (OPEC) meets on Nov. 30.

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Read alsoReuters: Oil prices rise from one-month lows after OPEC approves strategy"Those who were hoping for some upside from any sort of production agreement appear to have their hopes dashed," said Ric Spooner, chief market analyst at CMC Markets in Sydney. "It looks like there are speculative longs quitting the market."

Indications of higher-than-expected U.S. stockpiles is also dragging on sentiment.

The API report typically comes a day before official inventory data from the U.S. government's Energy Information Administration (EIA).

The API bases its numbers on voluntary reporting by members, while the EIA uses a bigger sample. Traders say oil prices could drop further if the government data confirms the large build.