RE: Broadcast Interview with Angus Energy Chairman Krzysztof Zielicki15 Jul 2024 17:02
In response to Bubblepoint you said
“ Basically a combination of pressure & depletion as they pretty much go hand in hand.
That said, if they "were" to use the field for "gas" storage, then they will not be able to go too much beyond the dew point limits, mainly because the only way to get it back over that point is to put gas back in until the pressure is restored sufficiently.
No one will want to pump shed loads of gas back in, that is basically lost to create the storage baseline pressure, otherwise they will suffer the same carp as Angus is suffering now and the gas pumped in will induce condensate as it is recovered back to surface, and the problems it generates. “ and “ You may think, hey so what, produce free gas and more condensates, but it doesn't work like that, basically the more liquid volume within the production tubing to surface, then you will quickly end up in a situation that the liquids in the column to surface are heavier than the reservoir pressure driving it out to surface and the well stalls out.
Currently they seem to be forced to manage/control the pressure by reducing the production and choking the wells back. this maintains a slightly higher pressure in the near wellbore and wellbore and reduces the amount of condensate that is generated in this area.
It is one of the reasons they need to install "velocity" strings in the wells, basically much smaller production tubing, which means the velocity of the gas travelling up that smaller tubing to surface is moving significantly faster, and that also means it helps flush the condensates out to surface easier too.
The Velocity strings could give a further 2-3 years of productivity before they are also overwhelmed and stall out.”
Many things you have posted is incorrect, firstly 1. just because the wells are producing condensate, does not mean they have issues with wellbore pressure. Many wells, including the wells at Saltfleetby, produced liquids right from the start at “virgin” pressures.
2. Opening new wells won’t necessarily lower the wellbore pressure on the other wells as they are not connected. Any new wells will also be at virgin pressure so would positively impact production.