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Msg  8529 of 8560  at  8/15/2021 2:48:59 PM  by


The following message was updated on 8/17/2021 3:01:06 PM.

 In response to msg 8528 by  GreatSwami
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Re: What RECO found - P_H

 There is one more thing I squeezed out of the Horizon Show Reports. And that is the maximum recorded and average RoP (Rate of Penetration) numbers. I missed these on my early look through - but they are interesting too.
While they only apply to the zones described - one can extrapolate from them to figure out what went on elsewhere. (We already know these wells took a long time to drill - months in fact. In Canada we drill 3000m deep vertical wells now in around a week + - or even less in some cases. 
The shallow Show interval from 715m to 1150m which I think is the 12 1/4" open hole down to Intermediate Casing Point setting depth? The fasted real time RoP was 13 m/hr - or 4.6 minutes/m This is really pretty slow for a fastest drill rate? In good porosity something in the 1-2 min/m range might be expected for anything with 15-20% porosity. The average RoP is recorded as around 8 m/Hr - or 7.5 Min/m. This is tight rock - no porosity. Ignore the minimum RoP of 1 m/Hr - nothing drills that slow - not even true Granite! (The minimum is just mechanical monkey stuff.)
The second show interval - drilled after setting casing and drilling with 8 1/2" open hole is reported as from 1270-1450m. The fastest RoP value recorded was 15m/Hr - or 4 Min/m - and this would be typical for a soft marl or a true shale - or it could be low porosity? The Average RoP is recorded as 6 m/Hr - or simply 10 Min/m. This is all tombstone and is about right for a dense tight carbonate or hard marl. 
The final show report interval is the short one from 1590-1655m. And here we get a maximum RoP value of 12 m/hr (5 Min/m) and an average of 5 m/Hr (12 Min/m). The 5m?Hr maximum value is either a shale, a soft marl, or perhaps some fractured carbonate? (Fault perhaps?) - all that 5 m/Hr is simply tombstone. Its a little slower because there iare anhydrite beds reported through here and deeper - and anhydrite typically drills real slow.
Since these are reported as the intervals containing any and all possible traces of any "shows" - and they use the term shows very loosely and liberally in this report - it can be assumed that the average RoP rates in all other intervals is about the average - or in fact slower. The only faster average drilling might possible be the shallowest stuff from below surface casing at around 150m to the top of the first reported show at 715m
Note that the reported clean porous sands from 1000-1100m must not have drilled that fast? (13 m/Hr being the fasted recorded RoP.)
I am assuming that the average sampling and flushing cycle time on the gas chromatograph would range from a little more than 2 minutes to less than 3 minutes between taking and evaluating one sample - and then taking the next one. This would mean that for almost all of the metres drilled in this well - there has been almost two to perhaps five gas samples collected per metre drilled. (On average) This is extremely good and thorough coverage - and even though not strictly "continuous" - is about as close as is possible to get. (Modern Hotwire Mud Gas Detectors only report the maximum gas value encountered at a rate of one value per minute. So the vastly greater sensitivity and precision gas breakdown provided by the chromatograph is done with only a very slight loss in the perceived and pragmatic "continuity."
Reading through the Lithology and oil show report text in the Horizon Mud Logging Show Report - I notice that in the middle and bottom Show intervals - up to 20-25% white calcite "Mineral" fluorescence is reported. Note that this mineral fluorescence is almost always related to fossil fragments. Fossil Corals, fossil brachiopods, fossil Nautiloids etc.
Wherever you have fossils you always have traces of the kerogen from the rotting of the associated soft body parts of the organism. These rotted (and thermogenically cracked) kerogens will support a slight "smell," produce a trace amount of gas - and may produce some traces of very weak cut fluorescence? I'm thinking that these shows reported - at least in the carbonates below 1100m - are entirely fossil related? It fits the general paradigm here! It explains the very low mud gas. It explains some of the reported aroma, and it supports much of the reported "oil show." And these fossil associated kerogens are pretty darn inert ones - and that supports the absence of C2 and C3 gas components too.
GS (Just continuing my deep dive into the news released treasure trove box and trying to slowly pull out and examine all the contained knick knacks and see if any of the trinkets and tchotchkes are valuable...) 

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Msg # Subject Author Recs Date Posted
8531 Re: What RECO found - P_H Public_Heel 0 8/15/2021 5:47:36 PM

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