Benchmark Brent crude oil was up 60 cents a barrel at $79.89 by 0918 GMT. US light crude was 35 cents higher at $69.00.
For the week, Brent crude was 1 percent lower while US crude was down 3.5 percent, both on track for a second consecutive weekly decline, and down around $7 a barrel from four-year highs reached in early October.
"It looks like the oil market moved too fast too far," said Carsten Menke, analyst at Swiss bank Julius Baer. "Prices are down around 8 percent from recent highs, trading back below $80 a barrel. Sentiment in the futures market seems to have cooled."
Refinery throughput in China, the world's largest oil importer, rose to a record high of 12.49 million barrels per day (bpd) in September as some independent plants restarted operations after prolonged shutdowns over the summer to shore up inventories, government data showed on Friday.
Undermining sentiment were official figures showing China's economic growth slowed in the third quarter to its weakest pace since the global financial crisis, with gross domestic product expanding by only 6.5 percent, missing estimates.
The data raised concerns that China's trade war with United States was beginning to hit growth, which may limit oil demand.
Also denting confidence was evidence this week that US oil inventories had risen sharply.
US crude stocks last week climbed 6.5 million barrels, marking a fourth straight weekly build and almost triple the amount analysts had forecast, the US Energy Information Administration said on Wednesday.
"EIA Weekly Petroleum Status Report was a complete shocker sending oil markets spiralling lower amidst some concerning development for oil bulls," said Stephen Innes, head of trading APAC at OANDA in Singapore.
Inventories rose sharply even as US crude production slipped 300,000 barrels per day (bpd) to 10.9 million bpd last week due to the effects of offshore facilities closing temporarily for Hurricane Michael.
Meanwhile, Iranian oil exports may have risen in October as buyers took cargoes before US sanctions on Tehran take effect from Nov. 4.
An unprecedented volume of Iranian crude oil is set to arrive at China's northeast port of Dalian this month and in early November before then, according to an Iranian shipping source and data on Refinitiv Eikon.