RE: OUTPUT DATA 08.11.202310 Nov 2023 13:39
WG,
The actual pressure data used in the CPR, which are factual recordings, do show "surface" depletion of 2-3 Barg since Jan 2023, which is too steep, but I would estimate is 90% a result of liquids rather than reservoir, the problem they have is "liquids being the enemy" that it is a snowball effect, every barrel of liquids additional produced daily adds to the flowing column weight/density, that lowers the surface flowing pressure and that snowballs into generating "more" condy/liquids both in the tubing and then into the plant.
They actually have zero option, they are not able to sit on their hands next year, the counter measures are going to be needed through next year, in both the booster pump, and the velocity tubing, I actually think they "may" end up putting velocity strings into all 3 wells over the next 12-18 months, but starting with A4, because it produces the most, and is most exposed to the issues.
They do note in the CPR that "choking back" flow is an option to reduce liquids to surface, and that "may" be some of what we see now, but it is "not" something you can do long term, as it will damage the near wellbore reservoir, as not producing the liquids simply means they fall back into the near wellbore reservoir, and that then hinders gas moving through to the wellbore.
My take on SLBY is that it is not the reservoir pressure that will be the determining factor for the life expectancy of the field, it will be how they "manage" the production of liquids to keep the dry gas able to flow.
I get a gut feeling that Angus want to drill SF09 & SF10 both in the hope it will deliver additional flow and give extended field life, but also I feel they are strategically looking at wells and positioning for maximum field storage or carbon dumping. I part expect the eastern flank will at best prop the field up for an extended maximum 2, maybe 3 years, if reservoir quality is commercial.
What I dislike more than the solutions that are available, is that even if they pay down the £6m + payday loan, into Spring, then it will need every dime of spare revenue right through the summer & Autumn to fund just the velocity string workover and the booster compressor facilitation, and then it is on to needing revenue to build for the SF09 drill start of 2025, it really doesn't look great financially for some considerable time.
It is worth noting that in the CPR, page 52, that the gas sales flow rate and the well head flow rates have a chunky discrepancy of around 20-25% which means there is an issue within the processing parameters, be it shrinkage, temperature, or other. it is an issue because the gas to sales will be actual, what they gat paid for, but the well head flow discrepancy needs to be much more accurate, as it can seriously skew production projections and plant & wellhead management.