Inflow test (dry test)
20 April 2010
Does anybody know what the cons and pros of inflow test on liner lap are?
This method is still performed in some areas but in some others has became obsolete.
Amir, I would agree with Aberdeen2Win. We test all production liner laps in the North Sea even if there is a production packer above the liner top. This is because any flow from the back of the liner would flow though 9 7/8" casing which is not designed to withstand the corrosive reservoir fluids, the chrome completion is. If we had prolonged flow from behind the liner top and into the 9 7/8" casing, we could find integrity problems later. It is not time consuming or difficult to inflow test as part of the pre-completion cleanout run/displacement, however it is if you find a leak!
I believe in parts of the middle east it is policy to inflow test the liner cement job before setting the liner top packer and most cement jobs are seen to leak. Therefore, it is relatively safe to assume the liner top packer is your only barrier a lot of the time so maybe making sure it is OK is not a bad idea.
The decision to test is depend on whether the production packer is above or below the liner lap. If the production packer is above then you may not require a test as the liner lap will only see minimal differential from reservoir drawdown.
If the liner top is above the packer then the liner forms an integral part of the 'A' annulus. Therefore you should test its integrity.
Finally if the completion fluid underbalanced the well from a safety standpoint you should test the liner integrity.
Best to inflow test on the same run an the mechanical and chemical cleanup.