Crude oil edges lower; positive week on disrupted supply, U.S. optimism By

-- Crude oil prices edged lower Friday but Eight Yuan Futures Investment Appremained on course for hefty weekly gains on the back of disrupted global supplies, hopes for higher U.S. demand and a weaker dollar.

By 09:20 ET (13.20 GMT), the futures traded 0.5% lower at $76.54 a barrel, while the contract dropped 0.4% to $81.00.

Both benchmarks are on course to register gains of around 4% this week, with the Brent contract climbing above $81 a barrel, at its highest level since late April.

Disrupted supplies from Libya, Nigeria

The market received a boost on Thursday with the news that political protests had shut down some oilfields in Libya, while Shell (LON:) suspended loadings of Nigerian oil owing to a potential leak at a terminal.

These two disruptions, when added together, are likely to have impacted the supply of around 600,000 barrels per day, and come in the wake of the Saudi one-million-barrel cut to the end of August and Russia's 500,000 barrel export reduction.

“Combined, these disruptions are significant and will be felt in a market that is already set to tighten,” said analysts at ING, in a note.

Optimism over U.S. economic activity

That said, the majority of the week’s gains followed the release of the softest U.S. growth in more than two years.

This eased worries that the aggressive rate hiking-cycling by the would continue for longer than July’s expected increase, potentially pushing the largest economy in the world into recession in the second half of the year.

This also resulted in the slumping to 15-month lows, making commodities denominated in dollars, like crude, cheaper for foreign buyers.

Additionally, demand for power in Texas hit a record high for a second day in a row on Thursday as homes and businesses kept air conditioners working full time during a lingering heat wave.

The Electric Reliability Council of Texas said it expected usage will set another record on Friday.

Positive monthly energy reports

Further price support came from Thursday's reports by the and , with both predicting that oil demand will pick up in the second half of the year, particularly in China.

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