** Oil producer's shares bouncing off more than2-mth lows & standout FTSE 250 risers as Barclaysupgrades rating to "overweight" from "neutral"
** Broker adds co to its Global Top Picks list, increases TPto 225p from 200p; flags recent stock price weakness (down 25%in last month vs peer group down 15%) & significant progress inEquatorial Guinea
** Stock, up 5 pct, poised for biggest one-day gain in c.7wks; also top gainer on FTSE 350 Oil & Gas Index,with nearly a fifth of its avg daily volume going through in thefirst 40 minutes of trade
** Of 23 analysts covering stock, 8 have a rating of "buy"or higher, 12 have a rating of "hold, and 3 have a rating of"underperform" or lower (venkateshasoumithri.mamidipudi.thomsonreuters.com@reuters.net)