Oil prices dipped on Tuesday as speculators took profits for a second day after big third-quarter gains and on concerns that higher prices might spur increased U.S. shale production.
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Brent crude futures closed down 12 cents or 0.2 percent to $56.00 a barrel, having lost almost 2.5 percent on Monday. U.S. crude futures fell 16 cents or 0.3 percent to $50.42.
Brent notched up a third-quarter gain of about 20 percent, the biggest increase for that quarter since 2004, and traded as high as $59.49 last week, but has since fallen about 6 percent.
"You’ve reached a place where the market needs a drumbeat of positive information to sustain a rally," said Gene McGillian, manager of market research at Tradition Energy in Stamford, Connecticut.
"The question is if demand and the supply cut are enough to offset the increase in (U.S.) production that’s coming."
Oil rose slightly on Tuesday following comments from OPEC Secretary-General Mohammad Barkindo that compliance with the oil output cut deal between OPEC and non-OPEC nations is extremely high. He added that the global oil cartel was looking forward to strengthening its cooperation with Russia.
Last week prices rose on tension in Iraqi Kurdistan after the region's independence vote, with Turkey threatening to close a pipeline that brings oil from the region in northern Iraq to the Mediterranean. Turkey has not carried out the threat, analysts said.
However, Middle Eastern oil producers are concerned the price rise will stir U.S. shale producers into more drilling and push prices lower again.
"Any time we get above 50 dollars a barrel drilling starts to ramp up, and that’s going to bring the price of oil back down again," said Mark Watkins, regional investment manager at U.S. Bank.
"Tomorrow’s report we’ll have to look at that data," he said, referring to the Energy Information Administration's closely watched weekly crude market report that comes out Wednesday morning.
After settlement, the American Petroleum Institute said U.S. crude stocks fell more than expected last week as imports dropped, while gasoline inventories increased and distillate stocks drew. The industry group said crude inventories fell 4.1 million barrels in the week to Sept. 29 to 465.4 million, compared with analysts' expectations for a decrease of 756,000 barrels.
Offering a small boost was the expected drop in supply next month of the four largest North Sea crude grades that underpin the dated Brent benchmark.
(By Julia Simon; Additional reporting by Amanda Cooper in London; Editing by Cynthia Osterman and David Gregorio)