INCONSISTENT WELL-BORE STORAGE BEHAVIOUR!

You have a problem and it is not going to be easy to resolve.

The storage coefficient suggested by the pressure-transient data does not correspond to the actual well. This means the storage coefficient you estimated earlier did not account some well-bore volume or fluid behaviour i.e.

• There is a leak somewhere in the system. For example, a wing-valve that does not seal will add the surface flow-lines to the well-bore volume and greatly increase the storage coefficient of the system.
  
• The well-bore volume is bigger that you thought. For example, a hole in the tubing would mean the well-bore volume includes the casing. If there is a gas-lift value in the tubing, then the odds are that it is leaking...
  
• The storage coefficient was affected by something that was done during the test that did not make it into the test reports.
  
• Etc.
  

Q: Do you want to try and figure out why the well-bore storage behaviour is inconsistent?

A1: No... But thanks for the help anyway...

A2: Yes, I will go back to my storage coefficient estimates and double-check everything...