The Thursday Wall St Journal had a very good article about what went wrong. Looks like it really is BP's fault. The well was behind schedule and over budget. To save time and money the BP manager cut short the mud circulation procedure ("bottoms up" in oil field lingo). Best practice is to pump all the mud up from the bottom and inspect it for natural gas. If gas is detected in the mud, the well has a leak. BP only ran the bottoms up procedure for an hour, where as 12 to 24 hours is needed. Then BP skipped a leak test after cementing in the drill pipe, even though the cementing contractor Halliburton warned of trouble. The BP manager, an inexperienced man, had to overcome objections to his shortcuts by the other contractors on the rig.
The underground gas pressure is high, because of the 13000 feet of rock sitting on top of the oil/gas deposit. When BP pumped the drilling mud out of the well, the gas forced its way up the drillpipe onto the drilling platform and caught fire. To add insult to injury, the last ditch safety device, the blowout preventer failed to close off the well. So, we have two errors of judgment on BP's part, combined with a faulty blowout preventer and the result is horrendous.
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