BUZZ-Pioneer Energy Services Corp: Lower-than-expected profit
** Land-based oil and gas driller's shares down 8.4 pct at $9.37 in early afternoon trading
** Company reports lower-than-expected Q3 profit
** Says Colombian operations continue to be hurt by client delays in preparing well sites
** Q3 adjusted profit 9 cents/share, below the average analyst estimate of 15 cents/share
** "Most of the miss was 'below the line' and it would seem drilling was weighed down largely by Colombia," Jefferies & Co analysts say
** Up to Monday's close, stock had risen 27.7 pct this year
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