Apart from that, I still don't think that distinguishing between "conventional" and "unconventional" oil makes any sense in respect to their prices. In other words, it is total volume of oil production that affects prices, i.e. you can't say that the price of conventional oil goes up while unconventional oil goes down. Indeed, oil comes in a wide variety of sorts and sizes (so to speak), but as I see it, if we exclude distance and transportation factors, these types of oil can be easily substituted with each other
We could also replace "conventional oil" with "oil sorts that can be profitably extracted for prices under 50$" - technology wouldn't matter. That would be the point - if this kind of "cheap oil" is sold out (or becomes more scarce) then extractors/sellers can dictate a price increase.
There would be only two cases I see with downtrending or stagnating prices:
1) if the State (e.g. the US or China) invests heavily in non-conventional (="expensive to extract") oil exploration/extraction and not the extraction companies, but the tax payers must pay for it. That scheme could run for some years but in my opinion not infinitely as it would put this country in a competitive disadvantage, so eventually the prices would rise again.
2) if technological progress is so fast that the otherwise expensive oil can be extracted in a much cheaper way. That's certainly possible, but I consider it unlikely as unconventional extraction techniques need lots of real resources (power, water etc.).
If oil prices were really set to grow, then they would most certainly expand production, not limit it.
PS: I consider the phrase I highlighted a conceptual error, as
recent oil production levels are based on
recent prices and not future price estimations.
Why should I sell my oil cheap now if I can sell it more expensively in the future?Maybe, because you need money now, not in the future?
Yes but that wouldn't apply to the case you describe in the first sentence. If an oil-extracting country/business faces a probable bull market, it makes no sense for them to expand production (and above all, selling)
only because of the bullish prediction. An expansion of production can be decided because of necessity, but the reason for the expansion we saw some years ago most probably was with the intention to drive the "unconventional" sources out of the market - with limited success, as I think I already wrote.