Lucan's updates..4 Feb 2019 12:46
From todays RNS:
All kill fluids in the wellbore and lost to the reservoir have now been recovered. In total 280 barrels have been produced.
The well flowed naturally to surface upon the removal of the completion and clean up fluids with flow rates rising steadily as the test continued.
So there should be no Brine coming to surface if the RNS is correct, but water content checks need to be ongoing, for clues to the source.
The water (at 200 psi) is from an Acquifer or from trapped water.
Is an acquifer likely to be the source of the 200 psi pressure? - I don't think it is as likely as a large amount of trapped water.
This water may have been extracted from the Portland well on this site, and has accumulated over many years.
If they are continueing flow tests, - as seems to be implied by Tidswell's tweet, I would expect the pressure to reduce slightly with time if the source is trapped water, but would be dependent upon the amount of trapped water present.
Lets see if George Lucan continues with site updates.