ONGC plan to buy Kazakhstan oil field stake a sign of future deals

    ONGC's (500312.BY) plan to fork over as much as $5 billion to ConocoPhillips (COP) for a stake in Kashagan could herald more such deals by Indian energy companies seeking to offset declining domestic production in the face of rising energy demand.     The purchase by ONGC Videsh Ltd., the state-owned company's overseas...