RE: Brockham - Drill or Drop8 Jun 2024 10:13
Frictionless,
ESP's are notoriously vulnerable if they cannot be run continuously, meaning they do not like being stop/start, yes they generate notable heat, a result of how hard they work, and why they don't like stop/start.
With Brockham, they struggle with wellbore replenishment, thus they failed to run continuously in the past.
As for donkey/rod lift, well they are extremely reliable, have no requirement for electrical feed downhole that is also vulnerable, and are extremely easily controlled from surface for stop/start, or simply run them at slower or faster speeds to match the wellbore replenishment.
They have been using mostly Donkey/rod lift at wytch farm since first discovery and it is still the main stay down there, along with the majority of worldwide low pressure reservoir lift needs. ESP is usually applied for highly deviated and horizontal wells with low pressure regime, simply because these type wells CAN replenish sufficiently to feed such ESP demands.
Add to that, normally ESP is NOT run down into the reservoir section, especially where high watercut is demonstrated, why ?? well because slow replenishing wells also tend to partially separate in the wellbore, and this generates an oil leg sitting on top of water in the lower wellbore. the pump simply works to try and mostly lift only the oil.
Keep googling, you'll get there eventually.
The thing is this workover was "supposed" to hopefully increase production, but it seems it has not, which in my book is showing all the signs of wellbore replenishment limitations.
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