6. ( 25 points) Consider the wellbore displayed in the schematic below: a. Calculate the flush volume if the well's MD is 21,125ft. b. You want to spot acid and let it soak on perforations before starting the frac operation. This will be done using the frac spread as WL is currently down doing a re-head and are not able to run in hole (RIH). How many bbls will need to pumped from surface to spot the acid at 18,500ft