Skadden, Arps, Slate, Meagher & Flom has advised state-owned China Petrochemical Corp., also known as Sinopec, on a $1 billion senior notes offering.

Through a subsidiary, China’s largest oil company sold three-tranches of dollar-denominated bonds: $300 million in three-year notes bearing a 1.75 percent coupon, $400 million in 10-year bonds with a 4.375 percent interest rate and $300 million in three-year floating-rate notes.