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International Brent crude oil futures were trading at $53.36 per barrel at 04:46 GMT, down 58 cents, or 1.08%, from their last close.
International Brent crude oil futures were trading at $53.36 per barrel at 04:46 GMT, down 58 cents, or 1.08%, from their last close.
US West Texas Intermediate futures were at $50.70, down 36 cents, or 0.71%.
Brent and WTI futures had jumped more than 10% since Wednesday's agreement by Opec members and Russia to reduce crude production by a combined 1.5 million barrels per day.
Analysts are now focusing their attention on implementation of the deal, the first agreement since 2001 by the Organization of the Petroleum Exporting Countries (Opec) and Russia to co-ordinate production cuts.
"It looks achievable on the face of it, provided the parties to the latest production cut deal stick to their pledges, which has historically been somewhat of a sticking point," ANZ bank said on Friday.
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