testing, page-2

Im no expert but for what its worth.

After casing is cemented which gets smaller near the bottom of the well but is still about 7 inches in diam at bottom of the well.

Then a production tubing to protect the casing is run the whole length of the casing which connects to the various valves at top of well. Special packers hold tubing in place inside the casing.

This tube is only 2 inches in most wells but can use upto 4 inches in diam if required, they can even have several tubes going to different zones but usually deplete the zones one at a time.
So an incredible amount of fluid can travel up this tubing even though it might only be 2 inches in diam. As you probably know the fluid is then choked back at top of the well as it passes through a series of high pressure valves. It maybe further choked back to maybe only half an inch or less. ONE inch choke is considered quite big, so its choked back or opened up to optimise the best flow depending on the pressure and viscosity of the oil and presence of water and gas or all.

All im trying to point out is that this small tubing inside the casing is more than adequat to handle very large volumes of oil.

LWR