Glencore said to vie with Vitol for $1 billion Kazakh oil deal

    By Stephen Morris and Andy Hoffman     Glencore Xstrata Plc (GLEN) and Vitol SA are competing to buy $1 billion of crude from Kazakhstan’s largest oil field, said two people with knowledge of the matter.     The world’s largest oil traders are negotiating to purchase state-run KazMunaiGaz National Co.’s share of production from Kashagan,...