Oil prices retreated in Friday’s session as fears of damage on oil and gas infrastructure in the U.S. Gulf by Hurricane Rafael receded. Concerns about weakening demand in China have also contributed to the oil price decline, after data showing crude imports in China fell 9% in October. That marked the sixth consecutive month that imports by the world’s largest oil importer declined on a year-over-year basis. Brent crude for January delivery was down 2.7% to trade at $73.76 a barrel at 11.40 am ET while WTI crude for December delivery…