Thumpalumpacus
Major
Oil is a complicated business both in terms of what comes out of the ground and the commercial relationships that have built up over the last 150 or so years.
The USA may be the largest producer of crude oil,
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Oil Production by Country - Worldometer
List of world countries by Yearly Oil Production in million cubic feet (MMcf)www.worldometers.info
But it still needs to import substantial quantities of crude just to keep its refineries occupied. And what it produces as crude is currently not all capable of being refined in US refineries, or to produce all the end products in the quantities required. Hence the need for imports.
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How much oil does the United States import (and why)?
About 60% of the crude oil that runs through U.S. refineries is extracted right here at home. However, our refineries run on many different types of crude oil, some of which we don’t produce here or can’t economically transport. In those cases, we use imports.www.afpm.org
"Re-tooling refineries to process solely U.S. crude oil (light crude) would cost billions — a risky investment that would take decades to permit, construct and eventually pay off. We lack the infrastructure (like pipelines) needed to cost effectively supply U.S crude oil and refined products to every region. Even if the economics of re-tooling our facilities worked, it can take close to a decade to permit and build pipelines in the United States."
So to be truly self sufficient in the longer term, the USA would need to invest heavily in refining and transportation capabilities and the US consumer will see the cost of many things increasing substantially.
It is a lot more complicated than Trumps call "Drill, baby, drill" at least in the short to medium term.
Most American crude imports are, as you note, for refining -- after which they're shipped right back out. If worse comes to worst and there's a clean break between America and the rest of the free world, devoting that import/export refining capacity to domestic needs instead would likely be a viable alternative.