You can't log confined water dives as dives but just as training record entries
According to PADI for training purposes an open water dive is a dive when you are at least at depth of 5 meters/15 feet and
a. remain submerged for at least 20 minutes
or
b. breathes at least 1400 litres or 50 cubic feet of compressed air
As the second is not information generally recorded on your logbook directly (you would need to convert to litres) the first definition is what counts.
There are some exceptions, for example during a rescue diver course you are authorised to log the 4 open water scenarios as dives but they may not fall into the classification above
According to PADI for training purposes an open water dive is a dive when you are at least at depth of 5 meters/15 feet and
a. remain submerged for at least 20 minutes
or
b. breathes at least 1400 litres or 50 cubic feet of compressed air
As the second is not information generally recorded on your logbook directly (you would need to convert to litres) the first definition is what counts.
There are some exceptions, for example during a rescue diver course you are authorised to log the 4 open water scenarios as dives but they may not fall into the classification above