Question on Venezuelan and US oil

In a thread on Trump's new "deal" for Venezuelan crude oil, I saw some comments about how the US can mix domestic light shale oil with the Venezuelan heavy crude to make it more economical to process

I understand that mixing the two would make the crude easier to process and therefore take less work to turn into gasoline and other oil products. What I don't really understand is how exactly would that work? Wouldn't the difference in price between the two cancel out any potential profit from the new oil mixture even if we didn't take into account the cost of expanding the extracting capabilities in Venezuela?