The White House is summoning oil executives to discuss potential investment in Venezuela on Friday, and while a preliminary list of attendees features the big names of American oil - Chevron (CVX.N), opens new tab, Exxon Mobil (XOM.N), opens new tab and ConocoPhillips (COP.N), opens new tab - it also includes several smaller independents and private equity-backed players. Only the largest U.S. oil producers have the scale and capacity to operate in Venezuela and have experience doing so, said an oil industry source. The inclusion of smaller domestic companies in the meeting is notable given that they mostly operate in the U.S.