BUZZ-Oil and gas companies gain as crude rises 3 pct
** U.S.-listed shares of oil and gas producers, service providers and drillers up as oil prices rise as much as 3 pct to $48.58/bbl
** Oil rose as investors took advantage of a two-day slide in crude triggered by Britain's vote to leave the European Union and as their focus returned to potential supply outages and drawdowns in crude
** Top percentage gainers among oil producers: Stone Energy Corp up 10.9 pct, EV Energy Partners LP 10.8 pct, California Resources Corp 8.8 pct, Sanchez Energy Corp 8 pct, Approach Resources Inc 7.7 pct, Baytex Energy Corp up 7.5 pct
** Oilfield service providers: North Atlantic Drilling Ltd 16 pct, Pioneer Energy Services Corp 9.7 pct
** Drillers: Ensco PLC up 7.6 pct, Seadrill Partners LLC up 7 pct
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