I think you look through life through the optimistic glasses of a young person in the oil industry. You're "hot stuff" b/c you already make six figs and the world is your oyster. Coming up and working a bit in the industry myself, I don't want to quash your dreams, but rather say, don't be surprised when things don't work out the way you just described them.
A couple of points:
1) "Major" oil companies don't need people with MBA's. They need people with real life experience. Having worked on major international projects in the 10's of billions of dollars, very few people I have worked with are "snot nosed" young whipper snappers and even fewer have MBA's. I am doubtful that they would put you in an MBA program and rotate you around internationally, because the people on the ground in the international scene need real life experience, not more schooling. I've help start a new company's offshore development program from scratch in West Africa. And I've worked in South America and Asia. People with MBA's I have worked with while overseas....Zero. Perhaps some people had them, but they didn't mention it and you certainly couldn't tell any difference.
2) I have a good friend who was a Petroleum Engineer and made a good wage. He got accepted to Harvard's MBA program and decided to go. Employment offer to return back to the ol' ponderosa...same job. Needless to say, he doesn't make significantly more money and works for a "major international" bank.
3) I hear of the rumored "fast track" or MBA programs in these MAjor Oil companies, but I don't know anyone who has come out of them any more successful than when they came in. I know of young people who thought "planning" was the way to the promised land, then they wiggled their way into what many people referred to as the "Manager's Bitch" working for a unit's drilling manager or facility manager. They then saw technical positions to be "step backwards," but no one wanted them in their "leadership" positions b/c they didn't know their a-hole from their elbow on the technical side. In effect, they were stuck b/c they didn't focus on what was important in the beginning, technical experience and knowledge.
Do an MBA b/c you want a career change, not b/c you think it may propel your current career forward. These are just my thoughts, observations and opinions on the matter, based on my actual experience in the same industry as you. If I were the person who was "assigned" as your mentor/coach, my advice would be to get back into the technical side, work hard, enjoy it and eventually, 10-15 years down the road other opportunities will open up. They're not going to put you in a leadership position with 5 years experience and MBA, especially overseas. Perhaps, you can become the "manager" of pylons in timbuktu, but that isn't very interesting either. I know people have done contrary and there quite possibly could be a couple people who walked the path you just described, but for Heaven's Sake, ENJOY your job for once instead of always thinking about the future. If want to do something else, go do it.
To answer the question if you want to retire while your kids are still in high school, the answer is YES. They grow up fast, and they are only with you for a very short period of time. Their teenage years are the best time to be able to spend all the time you can with them.
As the great Fred Schwed said, "Somethings cannot adequately be explained to virgins, either through pictures or words."