Traders saw the news as bullish, given the pipeline is expected to level off supply fluctuations.
Oil prices rose despite a weekly Energy Information Administration report that said U.S. crude oil inventories had risen more than expected in the week ending Saturday.
Stockpiles rose by 5.5 million barrels in the week.
On the New York Oil Mercantile Exchange, crude oil added $1.90 cents to reach $103.94 per barrel. Reformulated blendstock gasoline prices added 1.78 cents to $2.6284 per gallon. Home heating oil gained 3.46 cents to $2.9899 per gallon. Natural gas dropped 7 cents to reach $3.54 per million British thermal units.
At the pump, the national average price of unleaded gasoline fell to $3.385 per gallon from Tuesday's $3.393, AAA's Daily Fuel Gauge Report said.