More on oil shale
Posted by Heading Out on July 5, 2006 - 11:23am
Topic: Supply/Production
Tags: colorado, gassbuggy, oil shale, project plowshare, rio blanco, rulison [list all tags]
Section 1. Nuclear detonations prohibited exceptions. No nuclear explosive device may be detonated or placed in the ground for the purpose of detonation in this state except in accordance with this article. (Adopted by the People, November 5, 1974 Effective upon proclamation of the Governor, December 20, 1974.)While I did not know about that as I initially planned this series, I had intended just to point out that the unhappiness of just one Senator with a nuclear program (and I was thinking of Senator Reid and Yucca Mountain) can delay its implementation potentially for decades. In this case it is likely that there would be at least eight, and I think the point is made. However, since I do think it is useful for folk to know these things, I thought I would continue with the rest of the story from a technical point of view.Section 2. Election required. Before the emplacement of any nuclear explosive device in the ground in this state, the detonation of that device shall first have been approved by the voters through enactment of an initiated or referred measure authorizing that detonation, such measure having been ordered, proposed, submitted to the voters, and approved as provided in section 1 of article V of this constitution. (Adopted by the People, November 5, 1974 Effective upon proclamation of the Governor, December 20, 1974.)
The Gasbuggy shot, in 1967 used a 29 KT device at a depth of a 4,240 ft deep shaft, and created a cavity that was 80 ft wide and 335 ft tall, when one included the chimney. It also fractured the light shale around the opening. Anticipated dimensions were 165 ft with a 350 ft chimney.
The Rulison shot, in 1969, used a 43 KT device at a depth of 8,426 ft. it produced a cavity that was 152 ft wide, with a fracture zone that extends some 200 ft into the surrounding sandstone. (Predicted size was 160 ft with a 300 ft chimney). It is interesting to note that contractors now are seeking to drill near that shot, in order to extract gas from the shale. They have been restricted to drilling no closer than half a mile. And, lest there be some concern, let me quote from the article.
All the gas freed by the nuclear blast was produced and burned off at the surface, Bennetts said. The radioactivity at the site wasn't high to begin with, and since has decreased to below background levels, he said.The blast formed a sealed cavity underground, according to state and federal authorities. "Even if you drilled a well into that cavity again, there's very little radioactivity remaining to be produced," Bennetts said.
But authorities say drilling limits will prevent the cavity from being touched. COGCC director Brian Macke said the COGCC was "very careful" in its decision governing drilling in the area, and will require strict conditions such as reports from Presco showing tracking of directional drilling to make sure the cavity isn't disturbed . . . . . . . . Though it's not required, Presco will have gas from the well tested for radioactivity, he said..
There was some measure of the gas produced
Following the blast, in 1970 and 1971, the companies burned off, or "flared," 430 million cubic feet of gas into the open sky. The commission said that the level of radioactivity in the air surrounding the site did not exceed normal background levels.Rio Blanco, shot in 1973, was made up of a series of 3 30-KT devices stacked up the shaft, at a depth of 7,000 ft, with the devices actually at 1780, 1899 and 2039 m. Each device created a cavity that was some 120 ft in diameter, and about 250 ft high. (Against predictions of a 140 ft diameter with a 300 ft chimney.) Fractures from the explosions extended about 200 ft into the rock around the shaft.
The production of gas from the shots was reported to be less than had been anticipated and the levels of radiation higher, so that while the volume of gas that could have been collected "would have been commercially viable," that only held true had the gas been uncontaminated. It was not.
Interestingly there have also been tests of this technology in the Former Soviet Union, one of which is reported to have increased the gas flow by a factor of 20 However our purpose is to look at the development of reserves and their contribution to the marketplace within the foreseeable future. Particularly within the next fifteen years, when we can assume that the shortages of supply will become evident, it can, I think, be realistically assumed that there can be no use of nuclear devices to enhance oil shale recovery out West.
At the same time, the toughness of the rock its strength and behavior under mechanical attack make machine mining of the shale a likely impracticality on a sufficient scale to produce perhaps much more than 100,000 barrels a day within that time frame. That judgment on my part is based also on the need to regenerate the capital for the program, reconstruct the facilities and get through all the necessary paperwork.
There are alternate methods for mining the material, including those that are used in conventional metal mining of large-scale underground deposits. However, the mining of something that can generate high levels of potentially explosive gases, if very large scale fracturing and blasting is undertaken, creates levels of risk that will make development of such plans a lengthy process. The mining of Gilsonite for example, was only realistically achieved when the hydrocarbon was mined using high pressure waterjets. But the strength of the oil shale makes the conventional use of that technique impractical - even if it were allowable, which is conjectural.
With these prospects being diminished, the only likely potential for oil shale to have a significant impact in the next fifteen years is likely to be through some smaller scale in-situ retorting. There are techniques such as THAI being tested in the oil sands of Alberta, and the in-situ retorting that Shell is currently evaluating. My intent is to discuss these in the next, and final post in this series.
The series also includes:
Where it is
Mining the shale
and the nuclear option
I think the negative reaction you are receiving regarding this whole idea is precisely because you are focusing only on the technical aspects, which in this case overlooks a huge part of the picture. I don't want to say that what you are doing is unappreciated. It's certainly interesting from an academic perspective, I suppose.
But the reality is results have been mixed on a program that faces significant public resistance. I see no reason to sink research money into this which could be more usefully spent on alternative energy or to increase energy efficiency. I know ethanol is widely unpopular around here, but I would say funding ethanol research probably has more merit than spending it on this.
You can't just look at the technical merits of something, you have to look at other things like public opinion and morality to determine its overall feasibility. I mean, killing off 3/4s of the world's population would greatly reduce energy use and mean more resources for those of us who were left. From a purely technical standpoint it might even seem to be a great way to solve our problems, but no one even bothers to consider it for quite obvious reasons.
You see if you start applying the dangerous term "morality" to oil you might have to apply it to international relations, elections and all sorts of things that you really do not want "morality" to get a look in.
Extreme cynical mode disengaged.......
People have been considering it for a long time. I attended a seminar at Caltech in 1977 where we "considered it", with expected use in the early 21st century. Also see Kissinger:
http://en.wikipedia.org/wiki/National_Security_Study_Memorandum_200
Now ask yourself why all the media hoopla about the very non-contagious H5N1 which worldwide has killed fewer people OVER TEN YEARS than get killed in US car accidents EVERY DAY? You have been told again and again on TV that a "natural" flu pandemic with significant world depopulation is inevitable, and coming soon. Furthermore, it is expected to radiate from SE China. Why? There is no scientific justification for this scare mongering. Also see interesting facility report below:
http://www.dhs.gov/dhspublic/display?content=4377
I would rephrase that as "no one publicly calls for mass genocide, for obvious reasons, and everyone pretends that that means that noone is thinking about it."
There is no need of any "killing". Maybe we can start asking the Vatican to allow for the use of preservatives, for instance.
By definition, the future is unknown and (to some extent) unknowable.
Why do you think you are an exception to this rule?
The rich die old.
Heinlein postulated life spans of 5,000 years, with the main cause of death ultimately resulting from boredom. But he thought of a way around that too . . . (which I will not reveal)
Read more Heinlein.
Long life raionucleides are "safe" - they emit so few particles per hour that their impact is low.
It's the MEDIUM term radionucleides which are the killers - they dump most of their radiation in say 5%-30% of a human lifetime.
Long enough to get everwhere - short enough to have a high and dangerous activity.
How did you come up with tritium? In case these were thermonuclear explosions, and the powers envolved suggest otherwise, then tritium is burnt to non-radioactive helium, at least for the most part (depending on the yield of the bomb).
In case it was a pure fission explosions, which appears to be the case, then no tritium is used or produced. The contamination would come from the tiny radioactive particles that mix with the gas.
I'll bet that the triggers were U-235 rather than plutonium since a yield that small would be inefficent in burnup and would leave the balance of the critical mass as residue.
The tritium in the well could come from three sources.
- tertiary fission - U-235 usually splits into 2 fragments but in some small fraction it splits three ways with tritium being one fragment.
- unfused fusion fuel. One way to do fusion is H2 + H3 (deuterium plus tritium.) The downside is that tritium is as expensive energetically as plutonium. USually a hydrogen bomb uses LiD (lithium deuteride) as the fuel. Neutrons split the Li into H3 and helium-4.
- methane activation. Hydrogen in methane could pick up a neutron and than another. Note that most fusion reactions give up most of the reaction energy as fast neutrons.
I've never had anything to do professionally with weapons other than being a prospective target during the Cold War so the above are largely educated guesses.- I suppose should lead to insignificant amounts of T in this case
- I was aware just for the H2+H3 method and assumed LiD requires higher energies/yields. But if this is the only obstacle then the more expensive method should be a better pick, right?
For 3) I had no idea, I just assumed that the low percentage of naturally occuring D is making it implausible. Does this mean the light water in reactors becomes highly radioactive? Or (to answer myself) the lower neutron density makes the reaction improbable?Just for the record I am against using nuclear devices for commercial purposes - I just don't think it is moral and can easily get out of hand.
Fission neutrons are about 2 MeV at creation and average much less in the coolant (< 1 eV) during thermalization while a fusion neutron is 14 MeV.
Tritium is a problem for practical nuclear devices in that it decays with a 12 year half life. That makes the shelf life of a nuclear explosive considerably less than that of a Twinkie. It is used as a gas for "boosting" a fission reaction and for "dial-a-yield" purposes. An external vial containing tritium is allowed to vent to the critical assembly in proportion to how much yield the general wants. No boost might give 20 kT, max boost maybe 100 kT.
As to one's moral objections, the argument that "guns don't kill people, people kill people" has always made sense. It is certainly prudent to keep tight control on the gadgets and to only use them with judgment and restraint.
Nuclear power does not bother me that much because first the dangers are quite exaggerated (IMO), and second the technology has gone a very long way to get where it is now.
I don't begrudge the purely theoretical exploration of various proposals, but this one just seems to make our present forms of degrading and destroying our planet (Mountaintop Removal, etc) look like a dress-rehearsal. This reminds me of the Tom and Jerry cartoons where Tom is sawing off the branch he is sitting on. Saruman could hardly have come up with a better one.
And to tell the truth, if my choice is between a bunch of aboveground reactors (and their waste disposal problems) and existing bombs set off 2000' below the surface I'm not sure now what I would choose.
Solar Fusion is good enough for me..
The fight to hang to suburbia could become very intense.
I greatly doubt that the "nuclear" option would be used to extract oil or gas from "shale oil" to "hang on to suburbia". Suburbia will have to fend for itself.
What does seem entirely possible is that the U.S. military complex would set up some sort of DOD fuel authority and use it to attempt to keep fuel flowing to the military. The kind of heavy nuclear activity, and the need for exemption from the normal marketplace pressures as well as blanket protection from lawsuits make some kind of DOD/DOE program resembling the 1950's Cold War days of the "off budget" skunkworks type projects used to create our nuclear arsenal most likely.
The Army Corps of Engineers has alread issued a widely known report (at least widely known among the "peak aware" crowd) stating clearly the threat to military readiness that is implied in "Peak Oil" or oil depletion. It is hard to believe that the military intends to let the most powerful military establishment in world history just "wind down" without an effort to save it.
Even if the oil shale could never produce enough oil/gas to answer the needs of our current consumer lifestlyle, one can see that an energy "fortress", able to keep the military in enough fuel to retain continuity and control could be forged out of the combined energy from the tar sands in Canada, the shale oil in the West, and the natural gas remaining in the Canada/US outback. This would maintain the U.S. military as a formidible power in the world, especially as less well endowed nations and continents saw their military establishment waning away.
Europe, to me, is an example of a continent that is almost impossible to defend as a viable world power area. They will be completely dependent on outside fuel very quickly, with Russia and the Middle East in close proximity. France can stave off with nuclear power and weapons a bit, but are still in a precarious place. The ITER Project holds out promise, but still does nothing to cure the "liquid fuels crisis", and will take too long to build. The error of putting ITER in Europe is now becoming transparent to all, a hollow sort of victory for those of us who were against it from the start.
The U.S. military already runs a huge nuclear program so they have none of the public's fear or revulsion at the thought of the nuclear detonation option.
Roger Conner known to you as ThatsItImout
There is a difference between "hanging onto suburbia" in all its current details -- long daily commutes, large vehicles, natural-gas furnaces, etc -- and living in the suburbs in a sustainable fashion. Which suburbs you're talking about is probably also important. The Front Range suburbs in Colorado have, IMO, a reasonable chance in succeeding at electrifying themselves. Fly into Denver on a summer day and look at the area of roofs baking in the sunshine, or stand out on the plains a few miles to the east in the 10-15 MPH breeze that blows every day, and you see why I think suburbia survives in some places. Add telecommuting, smaller electric vehicles, improved household efficiency. Plus the fact that there's substantial local coal and gas resources to help get through the conversion. The suburbs in the Boston-to-Washington corridor are a very different story...
Nuclear stimulation of tight gas and in-situ retorting of oil shale sound like reasonable processes that may someday come about - once the Baby Boomer generation fades from political significance.
As to the gas from the nuclear stimulation, the main radioactive species is tritium. It has a 12 year half life so after 5 half lives (60 years) its concentration has decayed to 1% of its original levels.
It might be possible to develop nuclear explosives with less emitted fast neutrons and so less formation of tritium in the methane.
As to flaring, the tritiated water formed would be dispersed over a wide area and soon mingle with natural background and fallout. Burning the gas in the home would have more significant effects although I couldn't find the actual measured concentrations in the gas.
If one can flare the gas at the site, why not build a CCGT and make electricity with it?
I'm sure the generation of Americans that sees their own complicity in dropping those bombs on Japanese civilians might be caught in some irrational regrets, fears and anger, but your comment thoroughly devalues the perspective of people who saw where 'Absolute Power' had led us to, both in those bombs, and standoffs with the USSR.
It's not that surprising to see the blase' advocates of this 'Quite Reasonable' energy supply show such a disconnect from the very recent history that should serve to warn us of not only the hazards of playing with this Pandora's Box of Power, but also of the Industrialization of High Energy Programs and their very real cumulative effects on numerous systems within our Biosphere. (Including the distastrous problems with many of the oversized Hydro projects, etc)
In contrast to the irrationality of Fearing radioactive power and weapons, which have considerable evidence behind it as a source of great harm and being difficult to control and contain; I have to remark on the irrationality of those drawn to the Siren's song of Massive Quantities of cheap nuclear power. Cheap at any price and damn the torpedoes..
And once the susequent generations die of radiation sicknesses, nuclear proliferation and subsequent terrorist nuke strikes, and global warming, they too will have faded from political significance and all other significance as well.
Oh, I stand corrected. They will not fade from ironic significance. Nor from ROFLMAO significance.
Such heavy thinkers this new generation.