Occidental Petroleum announces Q4 earnings late Tuesday. Analysts predict quarterly profit slipping more than 9% with sales declining around 3%. Occidental in recent quarters has cleaned up its balance sheet. At the end of Q3, the Permian Basin oil producer said it repaid $4 billion of debt, about 90% of its short-term debt reduction target. Meanwhile, Warren Buffett purchased more OXY shares on Feb. 7.