Blaming the Iraq war on oil is largely nonsense.

Surricient oil and reserves under US-GB company control outside of Iraq.
No agenda to reduce sales to EU (esp. France) and Russia.

Statement by Dave O'Reilly, Chairman and CEO Chevron Texaco, San Francisco Chronicle, made shortly after the invasion, 2003:

"If it was a war for oil we wouldn't have done it.
Because if you look at the consequences, Iraq is now producing less oil, it is more unstable, it has led to disruption of the market." ----- It just doesn't work for me. There has got to be another reason. I assume that the reason is global security."

My mind is not quirky enough to know what was in the mind of Cheney. He had made a fortune in dealings with the Saddam Hussein regime. Perhaps he thought that the war would cement the hold by the Republicans on the White House and Congress.

At the time, my company (one of the majors) had relationships with EU companies (including the French giant, Total) and had sent technicians to Russia to help with production problems. The reasons were elsewhere.