RE: Fishing27 Oct 2020 12:14
Hi Manwell02. All this unofficial info certainly has to be taken with a lot of salt. The deviation probably won't make much difference to the ultimate result unless the well deviates off the carbonate shelf and into the salt basin, which shouldn't happen. But it's relevant for those who are waiting on the results. I'm assuming here that the B-1 well info on the OGA's website is reliable and fairly up to date, since it must have been provided by Rathlin, and probably fairly recently. The B-1 info on Twitter is much older, and seems to have been largely taken from Rathlin's 2015 application to the local council and / or the EA's 2016 approval for the B well site. I therefore think it may have been overtaken, at least in part, by Rathlin's more recent technical work. What the OGA deviation info says to me is that for every single metre of vertical depth to the reservoir(s), we will have to drill about 1.1 metres. This will slow things up a bit, perhaps by a couple of days by the time we get to TD, and it will increase the length of open hole which has to be cased off. The longer a deviated hole is open, the more difficult it can become to run the casing, although there must be ways of dealing with this. I don't know if the well site images on Twitter are up to date or reliable but, if they are, they don't seem to have run the 9 5/8”casing yet.