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108 comments on Saudi Arabia's Crude Oil Reserves Propaganda
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Therefore 37% is unsupportable as a "reasonable upper limit". The "reasonable upper limit" can't possibly be below the median for giant oil fields worldwide.
Countering biassed over-optimistic propaganda with biassed negative propaganda is not really that helpful.
Do we have URR estimates from giant and super giant fields no longer in production. My understanding is that although these fields are in general in decline but most are still in production so the final URR is not yet known.
It would be helpful if we could compare the recovery factors for sandstone versus carbonate supergiants.
Also, we should keep in mind that OOIP estimates are just that--estimates.
If memory serves, Matt Simmons put the upper end recovery factor for the overall Ghawar complex at no more than 40%.
the work of you and you (ace and stuart) and means, etal seems to support an ooip of about 170 Gb for ghawar. cummulative recovery is about 70 Gb , in excess of 40% ooip. ghawar is alledgedly producing about 5 million bpd. so a 50% recovery factor seems entirely reasonable.
one or more of the spe papers previously studied claims that the saudi's are injecting water at gravity stable rates and given all the supercomputer modelling they have alledgedly done, i tend to believe them. it would not surprise me is ghawar ultimately produces 65% of ooip in line with other gravity drainage reservoirs. get ready to handle lots of water you saudis.
spe paper 84459 gives an appraisal of 250 carbonate reservoirs worldwide.
Ace can address the cumulative production number, but I believe Greg Croft put cumulative production to date in 2004 at about 55 Gb, and who knows what the current production is?
What we do know is that Saudi Arabia has shown back to back annual declines in production--despite increased drilling and the highest nominal oil prices in history. This higher oil prices + increased drilling = lower production pattern is the same pattern we saw in Texas in the Seventies.
The hole in the argument is 5mbd for Ghawar.
And of course assuming production will remain high.
After a certain point in the life of a water drive reservoir water becomes the controlling factor in production rates. We have every indication that KSA is not planning on producing Ghawar at a 90% water cut. The engineering challenge they face once water cut starts climbing in Ghawar is huge.
If they reach 50% recovery fine but they are not going to do it with a production rate anywhere near 5mbpd more like 1mbpd.
The recovery factor argument hides the issue of how long we can keep production rates high. Given the status of Ghawar for example I'd say production rates could decline rapidly if they have not already.
Globally we could maintain 30-40mbd for years from watered out fields. But the big question is how stable is the other 40mbpd of production needed to maintain our current production rates ?
So overall expectations that increased recovery rates are possible are questionable and more important production rates from fields as they become highly depleted are even more questionable.
Its fun to pick on Saudi Arabia but the problems we highlight with them are endemic to the entire industry and at least from my reading although they are optimistic the claims they are making are not out of line by any means with the industry. I'm sure thats one reason they are a bit baffled that they are getting singled out.
Given that recovery rates of 35% are more common sure their is a lot of oil that could potentially be produced if you have a recovery rate of 65%. In fact playing with recovery rates and ooip allows you a wide range of potential production numbers. However a conservative estimate of no more than 35-40% recovery factor at high production rates makes a lot more sense as the world passes peak production and above ground factors become influential in determining how much oil will actually be pumped.
Sure we have a potential to produce a lot of oil in the long tail but will we ?
Surely they single themselves out by claiming to be the world's swing-producer with currently over 2 million barrels per day intentionally kept off the market? Don't see why that should baffle them!
Your mixing in the claim of production rate with reserves and recovery factors. I'm not saying they are not doing the same thing.
In general the oil markets have been adequately supplied despite the high price of oil and lack of expansion. We have yet to see shortages.
If you define what they mean by adequately supplied then yes no big importer has experienced shortages yet.
US economic problems could easily be placed on its own financial games and you could easily see the Saudia's be concerned that oil price will collapse as the world economy cools.
I'm not saying I believe any of this but I am saying that if you start questioning the Saudis then you make a effort to ensure that they are grossly out of line with the rest of the industry. The answer is although optimistic the claims they make are not way out of line when compared to the rest of the industry.
So bottom line is if KSA is lying then we have a pretty good chance that reserve estimates recovery factors production estimates etc etc etc are probably seriously exaggerated throughout the industry.
My personal conclusion is that either we have been feed a HUGE lie or the Saudis are only slightly optimistic in their the assertions they are making. Singling them out is not correct.
"The hole in the argument is 5mbd for Ghawar."
if the ultimate recovery for ghawar is 40% then it is dead meat already. is that what you are asserting ?
the 5 mmbpd is not my number, that was supplied by ace in a previous post. now to get to 50% recovery (85 Gb) from 5 mmbpd would mean a decline rate of about 10% assuming the decline starts at 65 Gb(wt's croft figures).
how do we know that ghawar is not producing MORE than 5 mmbpd? we dont. there is a lot we don't know, but i sure would not hang my hat on that 35 - 40 % recovery factor just because simmons says so. and dont get me wrong i think simmons has done a fantastic job of sounding the alarm.
you assert that the saudi's won't or can't produce at 90% water cut. what do you base that on?
it is my assumption that the saudi's will continue to produce ghawar as long as it is economical. a 5000 bpd (total liquid) well at 90% water is still 500 bopd, about $ 1.8 million per year in gross revenue. they probably won't be driving to the well in a rolls royce, but they could. granted also, they probably won't be exporting this oil.
international oil companies are producing wells at this water cut in ksa's near southern neighbor country (yemen).
Read my post. Assuming that production remains high past a 35-40% recovery is not in general a reasonable assumption. Reserve estimates based on enhanced recovery factors probably don't help us a lot as for as production rates go. I'm dismissive of these additional reserves as far as the rate they can be produced.
Since we are talking about a global peak in production its not clear what role watered out fields in unstable countries will play in future production especially for exports.
As far as Ghawar lets say that to get 5 million barrels of oil at a 90% water cut means 10:1 water to oil.
Thats 50 million barrels of water a day. I'm comfortable asserting that Saudi Arabia is not setting up to handle 50 mbpd of water. And I think you can see its a huge engineering project. And of course this is just one field that they would be dealing with. Your free to do the math. Russia produces high water cut fields and so does the US but the water handling facilities where built out over decades.
It makes more sense to produce the last of the field once water cuts are high at 1-2mbpd or so which fits pretty well into existing water handling infrastructure. So at least for Ghawar and probably many of the Saudi fields once water production overwhelms the current water handling capacity we can expect production rates to decline rapidly then reach a steady but much lower rate which they probably can maintain for decades.
I happen to believe that the Saudis have every intention of producing oil for decades and even maintain exports at some level I also think that people will be surprised what this level will be. I think internal consumption issues have taken even them by surprise but that something that can eventually be dealt with.
Finally its often claimed that the Saudi's produce their fields very conservatively while maintaining spare capacity however we have time periods in history where we can be pretty certain that they pushed the fields. The first gulf war for example.
Or look at this.
http://www.theoildrum.com/node/2331
The point is we are not seeing a huge difference between maximum production and normal production. In fact historically Saudi production has often swung up and down by 1mbpd.
http://www.economagic.com/em-cgi/data.exe/doeme/paprpsa
Over monthly numbers like this the changes could easily be related to filling and draining storage.
But this means even as reported production numbers drop of real production could easily be higher to refill storage.
Certainly we also have periods where Saudi production is constrained but considering the maximum production number reached over the decades its not clear that they have maintained spare capacity that when turned on is still conservatively producing the fields. In fact the periods of conservative production once you take into account they may be refilling storage and not reporting production. Out of 40 years only about nine years did they produce well below capacity.
And further more capacity has been around 8-9 mbpd for 40 years.
Time will tell but in closing if KSA is planning on keeping production high in the face of high water cuts then they probably need oil closer to 200 dollars a barrel to justify the expense.
yes the saudi's have produced their fields hard at times. they have also "rested" their wells at times.
shutting in the wells has the same effect as producing at a lower rate. that is equal, imo, to producing below capacity.
i have never claimed that the saudi's don't know what they are doing, on the contrary, i think aramco has done an excellent job of managing their fields for maximum recovery.
i doubt you belive that gravity stable production can result in increased recovery.
We have no proof that they are running gravity stable production.
We know for a period of 9 years or so they did produce well below capacity.
We know that they have maintained production capacity around 8-10 mbpd of day for over 40 years. Aramco was run by Americans till 1980. So we have no reason to believe that production was highly conservative before this.
Given the both the variability in production in the past and the current rock steady numbers KSA seems to use storage to manage production levels. They easily have enough storage to manage +/- 1mbd for thirty days.
But if they drain it they have to fill it.
We do know they practice well rotation however if this results in gravity stable or if some of what we think is well rotation is redirection to refill storage etc etc we don't know.
In fact the gravity stable rate claim for Saudi seems to lead to one group making this assertion.
http://www.ceri.ca/Publications/documents/GoE_Oct05.pdf
In any case the paper trail for gravity stable production is weak.
Maybe I should give my opinion so its clear where I stands.
I'm fairly certain that Al-Naimi knew Hubbert in fact he probably took classes under him.
I'm pretty certain given his position in Aramco before being promoted that he presented a Hubbert Analysis of KSA reserves and this is why he is in his position.
Given this I'm pretty certain that HL played a large role in determining how they managed their reserves.
Next even with this over time I think Al-Naimi have been overcome if you will at how technical advances have allowed them to keep production capacity high even as reserves dwindle. Not that this changes the overall plan but they have I think come out better than even they planned.
Next I think they plan on ensuring that they will be pumping oil for at least the next 30 years and also they plan on maintaining exports. Here I think the increase in internal consumption has been a issue they did not anticipate.
However I don't think they will maintain current production rate much longer. Their goal is to be a major exporter after all the rest have failed. This in general means beating Iran which according to the export land model will cease exporting by 2015. The point is its approaching the end game that has been planned for over 30 years. I think Saudi Arabia will still be shipping oil in 2015 just it will be 500-800 dollar a barrel oil (inflation adjusted) and exports could be as low as 2-4mbd. So basically from here on out they basically plan to keep revenue about where it is now. The ten year cut when they where supposedly swing producers was to ensure that they could still export post world peak.
Henry Groppe says SA take their cue from Exxon's practices:
Groppe figures they'll steadily pump oil for a good long while. Listening to the interview I started to figure him for another Cornucopist, yet he puts the peak in far far away 2008.
, David Strahan interview (audio and transcript).
"In any case the paper trail for gravity stable production is weak."
the paper trail IS weak. the fact that the saudi's mention it at all puts them in a separate league . the paper trail for the benifits of gravity drainage however, IS NOT weak. and the reason it has not been widely practiced..................rule of capture.
that and discounted present worth economic analysis.
Given low interest rates and a pretty reasonable expectation, IMO, for higher oil prices, I have argued, apparently like you, that deferring production makes economic sense.
"They easily have enough storage to manage +/- 1mbd for thirty days."
just curious, is this underground storage, or tanks. 30 million bbl storage tanks would be hard to hide in the desert. maybe joulesburns could do a (virtual) flyover to confirm this.
I'll check my schedule.
The only place it would really make sense to store a lot of oil would be downstream of stabilization plants (Abqaiq) or at Ras Tanura where it is piped onto tankers. Storing H2S-laden oil would seem to be a bad idea.
Here is Ras Tanura on Google Maps:
http://maps.google.com/maps?ll=26.642791,50.155833&z=14&t=h&hl=en
There are several tank sizes, most about 25 and fewer of 40-50 meter radii. From photos, the heights are about 20 meters. The biggest ones might hold 300,000 barrels and the smaller ones about 80,000. There are only about 100 tanks there total and 10 or so of the big ones, but more are scattered up the coast. It would take 100 of the larger ones to hold 30 days of 1M/day production. They obviously need to keep a lot of empty storage volume as a buffer. Perhaps it would make more sense to shut down the pumps for the water injectors on Ghawar. Better for the field, too.
Here is one project.
http://www.saudinf.com/main/y5406.htm
It mentions a number of storage sites.
They also utilize floating storage. One of the worlds largest tankers is now used as floating storage in the gulf.
http://www.country-data.com/cgi-bin/query/r-11616.html
Thats from 1992 and its already 1mbd for 30 days.
And another.
http://www.allbusiness.com/mining/oil-gas-extraction-crude-petroleum-nat...
I think this is basically the same article.
http://www.thefreelibrary.com/The+Saudi+Logistics.-a057574638
And another
http://www.arabnews.com/?page=6§ion=0&article=103972&d=25&m=11&y=2007
I can't seem to find info on the sizes of these strategic reserves.
I assume they are substantial.
This is why you really should not look at oil production except over 6 month smoothed moving averages.
The tank farm is the one in the Google Maps image linked above. It's somewhat more than I estimated, perhaps double, but they still need to keep some space available as a buffer.
The Madinah (Medina) Strategic Reserve article says that they excavated 4M metric tons of rock. Assuming a rock density 3X water, I get about 8 million barrels if all that volume could be filled with oil. In any event, I doubt that it is really used for playing the market.
I believe you slipped a decimal place. The revenue would be more like $18 million per year. With the right equipment for water handling, a 99 percent water cut would still make good money.
How interested would Aramco be in continuing production? That I obviously do not know, but from the perspective of a small operator -- onshore, with developed infrastructure from 5,000 feet or so --- whats not to like about even a 1 percent / 50 barrel per day well?
In general the larger the oilfield the greater the structural closure.
The greater the structural closure the lower the connate water saturation.
For instance, Ghawar has 1,300' of structural closure, this is the "buoyant force" if you will to overcome capillary forces holding water in place, as a result this drives the connate water saturation down to an average of 11%, and lower than 5% in the Uppermost layers if you believe the simulator xsections.
Recovery factor for a waterflood, ignoring formation volume factor is the change in oil saturation over the initial oil saturation. (Soi-So)/Soi= 1-So/Soi
So, say Ghawar has an Sor(residual oil saturation) of 20%, the theoretical recovery is 78% of the OOIP.
Take a smaller more conventional reservoir with an initial water saturation of 35%, an Sor of 20% and the theoretical maximum recoverable oil is 69%.
So nearly 10% of Ghawar's fantastic recovery under waterflood can be explained by the low connate water (high initial oil) saturation due to the immense structural closure.
Add to this the gravity stable flood per Elwood Elmore below, the large interwell distances and the favorable mobility ratio, it is the ideal waterflood.
Now Saleri wants to repeat this everywhere.
Good Luck.
I totally agree that Ghawar is probably close to the best case, and the average case of Saudi fields will be lower. My point is not that Saleri is right, but rather that Ace is likely in error the other way.
Stuart, I hope I’m wrong and that the average recovery factor for Saudi Arabia is higher than 37%.
You mention Laherrere – for those interested, here is a big list of his publications.
http://www.oilcrisis.com/laherrere/bibliography.pdf
Laherrere has access to IHS and WM data which is illuminating. Also, his charts are based upon that data. For giant fields which come from OPEC, the data is unaudited and is likely subject to gross overstatement by IHS and WM which leads to overstated RF in Laherrere’s charts. Stuart, the RF chart that you show above where you say that the median giant field has recovery of 40% is probably overstated since it is based upon overstated unaudited data. The median RF would need to be revised downwards closer to 35%. This was the same reasoning that I used in Fig 7 above. If you read this http://www.mees.com/postedarticles/oped/a46n51d01.htm you’ll find that Statoil uses IHS data. To get an RF of 44% (red line in Fig 7 for giant fields), they assume an RF of almost 80% (URR 460/ OIIP 580) for Saudi Arabia.
Here is one of his publications
Global Dialogue on Energy Security, October 2006
http://www.hubbertpeak.com/laherrere/Beijing20061009.pdf
Page 6 shows a range of 2P RF estimates for Saudi Arabia and some fields. Laherrere said that some of these estimates “look like wild guesses”.
For example for Ghawar RF, Roadifer (1986) 44%, IHS (1997) 60%, IHS (2004) 60%, IHS (2005) 70%, IHS (2006) 65%, Aramco (2004) 65%
For all of Saudi Arabia IHS RF, 1997 48%, 2004 51%, 2005 60%, 2006 59%
Aramco says for all of Saudi Arabia 56%.
Here is another one called
Uncertainty on data and forecasts, July 2006
http://www.oilcrisis.com/laherrere/ASPO2006-JL-long.pdf
Page 20 shows the IHS increase in URR for Saudi Arabia from about 320 Gb from its 2004 data to almost 400 Gb from its 2006 data. An 80 Gb increase!
WM showed an increase from about 240 Gb (2004 data) to 280 Gb (2006 data).
Both of these increases to 2006 occurred after Saudi Aramco’s presentation in Feb 2004.
If WM’s 2004 URR of 240 is divided by OIIP of 580 Gb, this gives an RF of 41%.
On page 19, Laherrere said “Saudi Arabia has been controlling OPEC for a long time because holding enough spare capacity to increase quickly when in needs (or to fight on market share as in 1986) or to
reduce production. They want to keep their leading role of swing producer, so they need to claim high reserves. Up to now, field data were confidential, but in front of Matt Simmons’ claim of overestimate, they have released some field data; which are now
accepted by the scout companies as IHS and WM.”
Both WM and IHS are consulting companies which exist by charging customers for their services and reports. Both of these consulting companies happily increased their URR for Saudi Arabia based on some Powerpoint slides from Aramco. Why? Aramco is probably a key customer. Also, these consulting companies would have difficulty reporting different numbers than what Aramco says.
Myron Horn, a geologist, is still estimating Ghawar URR as 66 Gb in the AAPG in April 2007. Assuming Ghawar has about 190 Gb OIIP this is an RF of 35%.
http://www.searchanddiscovery.net/documents/2007/07032horn/images/horn.pdf
Dr Samdouh Salameh, in section 3 above, says RF of only 25-30% for Ghawar.
Based on likely data overstatement by oil consulting companies, my upper limit of average recovery factor of 37% is not changed.
The data in the graph I posted above are labelled 1985 and 1996. That was before Petroconsultants was acquired by IHS, and while Campbell and Laherrere were associated with Petroconsultants (eg see their affiliation on the 1997 Sciam piece. So they were personally involved in preparing that data. So your theory would require not that the current IHS conspire with the Saudis to inflate global recovery data, but rather that Campbell and Laherrere personally be involved in inflating the data. This doesn't seem very likely.
Furthermore it's likely that global recovery factors have improved a bit since then.
I'm not saying for certain that recovery factors for the whole of Ghawar will necessarily be as high as North Ghawar - far from it. We have very limited data with which to project the performance of the South. Rather my point is that you are claiming that Saudi Arabia will necessarily have a rather poor global recovery, with the highest reasonable limit being only 37%. But that isn't the highest reasonable limit. For example ASPO has estimated a 45% recovery factor for a reasonable estimate. Zagar, who you cite, suggests a Saudi URR of 255Gb, higher than your "upper reasonable limit". Within the context of the TOD community, Euan, I, and Khebab, who have all studied the issue at some length, think the recovery will probably be higher than your upper limit. So you are not in fact representing the range of reasonable opinion on this question, but rather making a very biassed presentation that skews negative.
Many have studied Saudi Arabia in depth, the problem is that for about the last three decades there has been no audited data on their fields so consequently much conjecture. You choose to be optimistic when there is a lack of audited data. I choose to rely on historical audited data and on experts such as Horn or Salameh who can provide some guidance. For example, I would place significant support on the OIIP 530 Gb in 1978 and it could be 580 Gb now.
What makes you think that Petroconsultants (Campbell and Laherrere) have not inflated their OPEC data when they were at Petroconsultants? First your use of the word inflation implies that they knew the real data - they didn't then and still don't - I don't and you don't. Petroconsultants was a consulting company. They do not own any oil reserves. Consequently, many of their clients who own oil reserves could persuade them to publish reserves which support those of clients OPEC and Saudi Arabia.
Do you have Petroconsultant's data on Saudi Arabia URR from 1975 to 1985? I would be interested to see how Petroconsultants' Saudi Arabia reserves, OIIP and recovery factors changed during those years. Was Petroconsultants pressured by Aramco's statements of constant reserves and also keep proven reserves constant about 160 Gb from 1980 to 1987?
Why have you never addressed the Ghawar URR of 66 Gb from Myron Horn? Horn published this estimate as a two part article in the Oil and Gas Journal, April 2 and April 8, 2007.
http://www.searchanddiscovery.net/documents/2007/07032horn/images/horn.pdf
His report was "carried out by linking estimates of ultimate recoverable oil and gas made by industry experts over the last 60 years (Salvador, 2005) with current data on 945 giant fields (556 oil and 389 gas, Horn, 2003 modified)." (quoted from the link above)
Do you agree or disagree with Horn's Ghawar estimate? If so, why?
Horn has also estimated that Ghawar has a gas URR of about 186 TCF or around 30 Gb oil equivalent. Conjecture warning: It wouldn't surprise me if somebody had added this 30 Gb to the 66 Gb to get say 96 Gb URR oil equivalent for Ghawar. Then the word "equivalent" was dropped and Ghawar URR has become 96 Gb URR oil.
I do not believe that the upper limit of the average recovery factor of 37% is biased downwards, based partly on Horn and Salameh. Even Matt Simmons doubts that Ghawar URR oil is more than 70 Gb. North Ghawar, Shaybah and Abqaiq may have recovery factors which are higher than 37%. But, undoubtedly Aramco has many low recovery fields.
In general its not clear that this argument is important. The only reason it would be important is if the increased URR resulted in KSA able to maintain production rates for several more decades.
At least in my reading for the most part this has not happened Purdhoe bay for example. Right not its estimated final extraction could be 14Gb. However the current production rate is far lower than peak production and is still steadily dropping. Also worse the equipment is getting old and the field may well be abandoned simply because of infrastructure replacement costs. The point is your arguing about oil that may or may not exist and even if it exists and is pumped the production rate will be low.
30-35% recovery at a high production rate is very reasonable and more important as far as the short term effects and it highlights that reserve increases are from the expected result of technical advances.
Extracting oil at a 30% recovery factor from a larger OIP reserve is completely different from getting additional recovery of 10% from a smaller reservoir. Production rates are different costs water handling etc.
But we in general treat these as the same problem. Determining if the world is going to maintain or increase production capacity over the next ten years and the potential decline rate is not influenced much by additional extraction from watered out fields. Farther out say 15 years from now this argument may be important but I'd imagine that by that point in time the world will have a pretty good handle on how much oil is really left.
Or I could be wrong and all this oil from expected increases in recovery factors technical advances etc will be pumped at high rates and production will continue to grow. But the underlying problem is this since we are entering a period where these paper barrels better start showing up.
If you're suggesting that Campbell and Laherrere are inflating recovery factors, I think you're getting into tinfoil hat territory.
You can find my opinion on Ghawar reserves here.
Had a quick look at your opinion - couldn't find any acknowledgement from you about Horn.
I'll repeat the question:
Why have you never addressed the Ghawar URR of 66 Gb from Myron Horn? Horn published this estimate as a two part article in the Oil and Gas Journal, April 2 and April 8, 2007.
http://www.searchanddiscovery.net/documents/2007/07032horn/images/horn.pdf
His report was "carried out by linking estimates of ultimate recoverable oil and gas made by industry experts over the last 60 years (Salvador, 2005) with current data on 945 giant fields (556 oil and 389 gas, Horn, 2003 modified)." (quoted from the link above)
This was a report done by Horn 2004 which stated that Ghawar had remaining 18 Gb oil/gas equivalent and had produced 79 Gb oil/gas equivalent.
http://www.searchanddiscovery.net/documents/2004/horn/images/horn.pdf
Note in the first link of Horn that there was 66 Gb URR oil and about 31 Gb URR gas equivalent. If the gas oil ratio in depletion has stayed same as what is remaining then Ghawar was about 81% depleted in 2004, according to Horn. If this ratio is applied to Aramco's presentation in 2004 that Ghawar has produced 55 Gb oil then this gives Ghawar URR of 68 Gb oil.
Do you agree or disagree with Horn's Ghawar estimate? If so, why?
FF,
If North Ghawar has pretty much watered out, isn't the key question the recovery factor for the southern, and lower permeability, portion of the complex?
I never said it pretty much watered out but I think the answer to your question is yes.
FF
I'll rephrase it this way. It seems to me that while North Ghawar has accounted for a huge percentage of cumulative production to date, it will account for a vastly smaller percentage of future cumulative production, so the recovery factor on the north end is not terribly relevant to future production. The key question is what the recovery factor is for their reserves outside of North Ghawar.
Which is another way of stating the obvious: What did Texas do to offset the decline from the East Texas Field? Answer: we couldn't.