Conoco stock has been on a tear this past year, rising more than 40%, although it’s still off sharply from its 2008 high. What’s cheering investors? CEO James Mulva’s plan to shed assets — more than $15 billion worth in the past 18 months — and reduce long-term debt.The company also plans to drill 150 new oil wells this year in its Eagle Ford project in southern Texas and anticipates hitting peak production of some 65,000 barrels per day in 2013. Mulva’s expanding shale operations, too, having added about 90,000 acres in North America last year. —P.N.