RE: re RNS21 Dec 2021 01:45
LUCAN: "As I remember, the problem initially was that the oil was thick and did not flow freely. Hence the inability to declare a flow rate. There were suggestions that heating the pipes or injecting steam might resolve the problem, but so far as I know this was never demonstrated. Also it's a little too like fracking. If this is still the problem , why not say so?"
I don't think any of these are problems (though I must say up front I have no relevant qualifications whatsoever, I just like reading about this stuff). The oil is a particularly light crude, it just happens to have a significant wax content. It's actually lighter than the Texan WTI and Brent standards. For real problem oil, look at the heavy gunge they produce in Venezuela with low API, high sulfur content and metals like Vanadium. It has to be diluted with naphtha before it can even be refined. Barryroe oil has low sulfur, acidity and metals. Yes, the wax content needs handling but there is decades of experience with this. Before the US shale fracking revolution (which was low wax oil) about 25% of global crude was waxy.
Also, the process required is nothing like fracking (not that there's anything wrong with fracking imho). Hydraulic fracturing uses fluids to force open cracks in tight shales so that the hydrocarbons can flow. Shales can have permeabilities much lower than solid cement. The Barryroe sandstone permeability is thousands of times higher than your typical shale.
Flow rates *were* measured at Providence's Barryroe well and they were very good. The confusion about flow rates was that a second test of an upper gas-rich interval in the Basal Wealdon had to be choked down because -- according to the company -- the surface equipment was optimised for measuring oil flow. Lansdowne has been talking up the gas potential in their own RNS today, though the implied recovery factor sounds a little on the high side.
If there was ever going to be a potential problem it was faulting, which would prevent access to connected volumes of hydrocarbons and render the development too expensive. But my understanding was that the company had satisfied itself as to the low risk of this through reprocessed seismic.
So I'm perplexed as to what the technical problems are that PVR hinted at in the RNS today. I'm hoping it's just the special handling required for the waxy oil, which is definitely manageable. I think the rest of PVR's problems are all above ground ... in the funding department and with government bureaucracy.