Brent Slides as US Adds More Barrels

Crude oil slid lower on Monday on signs that the United States is continuing to add output, largely counteracting strong economic growth in China and OPEC efforts to cut production.

Benchmark Brent crude futures were down 53 cents at $55.36. On Thursday, before major markets closed for a holiday break, they settled up 3 cents at $55.89 a barrel. US West Texas Intermediate crude futures were down 46 cents at $52.72 a barrel, after rising 7 cents to $53.18 on Thursday, Reuters reported.

Both benchmarks had risen last week for a third consecutive week, with Brent adding 1.2% over the four days before the Good Friday holiday and WTI up 1.8%.

While trading was subdued, the focus was on indications that shale oil output in the United States was pressing higher.

"All the signs of an ever-growing bull market are starting to fade away, (with) Libya and geo-political tensions easing, but also because the Texans are back and they are pumping like there's no tomorrow," said Matt Stanley, a fuel broker at Freight Investor Services in Dubai. "If I were OPEC, I'd be pretty worried."

Although the failure of a ballistic missile launch in North Korea brought some respite, markets were braced for further tensions in the region. In Libya, fighting between rival factions has cut oil output, but state oil company NOC was able to reopen at least one field and was pushing to reopen another.

US drillers last week added rigs for a 13th straight week, a sign output gains there will continue.

Energy services firm Baker Hughes said on Thursday drillers added 11 oil rigs in the week to April 13, bringing the count up to 683, highest in about two years.

Increasing US output is undermining attempts by the Organization of Petroleum Exporting Countries and other major oil producers to curb output and sustain a rally in prices in a market that has been oversupplied since mid-2014.

On Sunday, Iran added fuel to hopes that OPEC and non-OPEC oil producers could extend their output cuts beyond the initial six-month agreement. Any cut extension could help underpin prices.

US crude oil production has climbed to 9.24 million barrels per day, according to the latest Energy Information Administration data, making it the world's third-largest producer after Russia and Saudi Arabia.