Who is George W. Bush? The Business of Oil
George W. Bush drilled a lot of dry holes while in the oil and gas industry. But his business failings (it can be a rough business after all) are not what most detractors latch onto in condemning his record - it's perceived conflicts of interest, alledged insider trading, and undue political influence.

"Reporters have been particularly intrigued by George W.'s adventure in the oil industry, and well they might be. There was something about it that smacked of a shell game run by a very fast hand."
Robert Sherrill writing for The Texas Observer

"Bush was still at Harken [Energy, company that acquired a failing Spectrum 7 where Bush was CEO] when his father won the 1988 presidential election, and in January of 1990, the company acquired exclusive offshore drilling rights from the government of Bahrain.
Harken acquired those rights even though, according to the Wall Street Journal, the company had 'never drilled a single well overseas or in water,' and had to seek out additional investors."
Michael King writing for The Texas Observer