Collusion and Monopolies happen all the time. The number one defender of Collusion and Monopolies seem to be mos tLibertarians.
If you're interested in reading more on the topic, search for keywords: rothbard, myth of natural monopoly
To illustrate, imagine we were in a free market and I wanted to start an oil company to disrupt the prices of an oil cartel. How am I going to do that if I don't have any oil?
By offering those resources to the same spaces that utilize oil, you are competing with oil. If you are able to take customers from oil, oil will be forced to reduce their prices.
As I mentioned in the previous comment, you should check out the keywords I mentioned. And if you are thinking that I'm missing something, please direct some resources my way.
It is my experiences with defenders of monopolies. In my conversations with dozens of Libertarians they do not agree with me that the government should limit monopolies. I have a strong academic background and find that the philosophy of Libertarians is FAR from the grass root Libertarians' beliefs.
Most of the "taxes" you have include to make it "the most friction applied of almost any commodity" to are royalities.
The government for country X owns the land and leases it to E&P companies under an agreement that they will pay a Y% royalty in addition to taxes. In other words, I own this, but I'll let you produce it for me for a Y% cut.
Royalties are taxes in a strict sense, but they would be paid if it were a private landowner as well (though the government usually has more leverage to negotiate a better deal than an individual landowner).