The refineries on the West Coast are not set up for light sweet crude from Shale. They could be converted, but it would take a year and make no sense anyway because it costs more to ship oil from Houston around South America , or through the Panama canal, than it does to ship from the middle east. @Snagglefoot has posted here several times about Canada now exporting crude and fuel to our West Coast.Isn’t the reason we import because we don’t have the refineries that are needed to refine the USA crude, as it is different then Saudi crude that is more needed for oils etc….? Just like different kinds of metals are used for different applications, so are different crude oils makeup.
Given the Canadians figured out how to put a pipe over the mountains I presume we could, but there was no desire.