* Brent set for small monthly fall, WTI for monthly gain
* Marketlink crude pipeline rates cut after Keystone leak-sources
* Chinese factory activity shrinks for sixth month
* POLL-Oil prices face pressure as global economy slows
By Scott DiSavino
NEW YORK, Oct 31 (Reuters) - Oil prices were nearly 2% lower on Thursday after a leak on a key U.S. pipeline disrupted supply flows and on data showing weak factory activity in China.
Brent LCOc1 futures were down 40 cents, or 0.7%, at $60.21 a barrel by 12:08 p.m. EDT (1608 GMT), while U.S. West Texas Intermediate crude CLc1 fell 94 cents, or 1.7%, to $54.12.
The front-month Brent contract for December delivery expires on Thursday. Futures for January delivery LCOc2 were down about 1.1% to $59.53.
For the month, Brent was on track to fall less than 1% and WTI was on track to rise less than 1%.
In the United States, TC Energy Corp's TRP.TO 750,000 barrels per day (bpd) Marketlink crude pipeline from Cushing, Oklahoma, to Nederland, Texas, was operating at reduced rates, three sources said on Thursday, due to supply disruptions after the TC Energy shut its Keystone pipeline after a leak in North Dakota. is connected to the 590,000-bpd Keystone oil pipeline system, a key transporter of Canadian crude from northern Alberta to refineries in the U.S. Midwest.
Traders said the Marketlink disruption pressured U.S. crude prices lower by making it harder to move oil out of the Cushing storage hub, which is the delivery point for WTI crude contracts.
About 9,120 barrels of oil were estimated to have spilled from Keystone after a leak was discovered late Tuesday, according to state regulators in North Dakota.
In China, meanwhile, factory activity shrank for a sixth straight month in October while growth in the country's service sector activity was its slowest since February 2016, official data showed on Thursday. protracted trade war between China and the United States has been weighing on the demand outlook for oil.
Leaders from the United States and China encountered a new obstacle in their struggle to end the trade conflict when the summit at which they were supposed to meet was cancelled because of violent protests in Chile, the host nation. President Donald Trump tweeted a new location would be announced soon. Reuters survey showed that oil prices are likely to remain pressured this year and next. The poll of 51 economists and analysts forecast Brent crude would average $64.16 a barrel in 2019 and $62.38 next year. third-quarter results, Royal Dutch Shell Plc RDSa.L warned that uncertain economic conditions could slow its $25 billion share buyback programme, the world's largest, and had led to a downward revision to its oil price outlook. U.S. Federal Reserve cut interest rates for a third time this year on Wednesday, looking to bolster economic growth with a move that could also boost demand for crude. gains are likely to be capped until inventories start to show sustained declines.
U.S. crude inventories USOILC=ECI rose by 5.7 million barrels in the week to Oct. 25, the U.S. Energy Information Administration said on Wednesday, compared with analyst expectations for a much smaller increase of just 494,000 barrels. EIA/S
"The U.S. stock report was anything but encouraging," PVM analysts said in a note.
Cushioning the bearish crude data, the EIA showed gasoline and distillate inventories continued to draw.
IDn:L3N27G0RA CHART: U.S. oil may retest support at $54.48
IDnL3N27G16K GRAPHIC U.S. petroleum inventories
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