I do not believe that all goes into refineries, but the location of oil storage facilities built along the Texas Gulf coast load ocean tankers destined for China. Same with NG liquefaction that is done outside of CC and Freeport
Unless they can find a feed line that doesn’t go into a refinery (I don’t know of any) then it goes the same way everybody else’s goes. Of course they sell to China but China doesn’t get a better deal simply because some the oil they produced is in there. They buy at market price just like everybody else. The advantage they will have is the profit made from producing oil here in the US, this will go along ways to reduce their shipping costs back to China.