RE: SWP presentation31 Dec 2019 05:29
The oil layers at Saffron are mainly in alluvial, they've migrated from a source rock and can move through the layers.
Depending how deep they are the sands will be more compacted, other forces like folds, heat and thrusts will also have an effect on hardening the sand layers.
Alluvial clays laid over the sand normally form a trap as they harden.
What have we got at Saffron
The sandstone layer of the Lower Cruse has been lifted in a fold and trapped with a thick clay layer. You can see on the satellite view there is a mud volcano to the SW, so was also heat pressures.
The sands above have localised traps , so I would expect excess lighter oils have migrated to the surface and dissipated.
There is a scale of porosity called the Darcy scale ranging from granite 0.1, sand 1.0 and loose gravels 100
We have a Darcy forecast to be 1.0 so the oil should flow or seep through it.
We also have a trap of 0.8 so some lighter oils may have migrated.
In the sandstone we have a vertical well, it maybe cased and shot blasted at set intervals.
Depending on gas pressures and heat the oil will "bleed" into the core and down into a pump. It may initially come out on it's own like opening a can of pop but will eventually need a pump.
If you pump too hard, sand will get drawn into the core and block things up, so needs to be controlled
Over time the pressures go and the oil stops seeping into the well this is where CO2 (or steam)comes in as it mixes with the oil and makes it more fluid and pushes it towards the core
Being a fairly thick oil I personally will be happy with 200bopd anymore than that will require workovers more regularly.
Talk of 1,000 may happen initially but I don't think they're going to tell us, this will deplete sharply as the pressures drop.
New separation tanks will be needed to remove any sand/water.
Remember the flows aren't the prize it's the increase in reserves that counts, which we may not no for a month or 2
ATB:))
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