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LAWRENCE LIVERMORE LABORATORY V University of Califomia/Lh/Ermore

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LAWRENCE LIVERMORE LABORATORY V University of Califomia/Lh/Ermore *^s>~ <=? UCRL-51453 iASStl NUCLEAR IN SITU RECOVERY OF OIL FROM OIL SHALE A. E. Lewis September 14, 1973 Prepared for US Atomic Energy Commission under contract No. W-7405-Eng-48 LAWRENCE LIVERMORE LABORATORY V University of Califomia/Lh/ermore DISTRIBUTION OF THiS DOCUMENT IS UNLIMITED .NOTttt "Thh fcpofl «i piejutnj at ah acvuuftl or *ml ifwowfrd bj Ihc Udltol Sum CrtHttftmrot. NrllWf lhc I'mlnJ Slate* m» (tw t/pJIoJ Slain Aloak Vextrr C*wnnitM*t*fl. «* aay of ftwu rmpteyro. (w/ jrtf «/ ifacir rofllracturi. tuba>&ttatf<*i. «* Ifcctf cwptojvo. make* any Kanaaly. «pm* tx im?tal. m avtwsw» any Iqs) lutttliff « lofHsiiiliililf fdf Ihr a«wm<*.«*!»F!*l«»c« vt utstuXncm at any tofamnfan, appafaltn. pnhfiKf of pn*K» di*4o*ia. n* »cprewal« Ituf it. utf *i»U out i«/»a£r pwaldr' pitttnl H&ht%/* Printed in the United States of America Available from National Technical Information Service U. S. Department of Commerce 5285 Port Royal Road Springfield, Virginia 22151 Price: Printed Copy $ *; Microfiche SO. 95 _ NTIS Pages Selling Price 1-50 $4.00 51-150 $5.45 151-325 $7.60 326-500 $10.60 501-1000 $13.60 TID-4500, UC-35 Peaceful Applications of Explosions m LAWRENCE UVERMORE LABORATORY Unn*&y0tCMrrM/Vnmam.CmXTn/*4S50 UCBL-S14S3 NUCIEAR IN SITU RECOVERY OF Oil FROM OIL SHALE A. K. Lewis MS. date: September 14, 1973 -NOtlCt- IW upon *n prtpotd u n mmi or n«k tpwaond fey nw VHui SUM* Genruwm. ttonw a» i/mud Sinn Mr i>» Van* m Aiartc riwp rmnnmriw. wmol Unk iBptorm. mr w of look- soundoft, IMCWPKIWI, or tin* MtoleriOt, utniv«mw,iwm«i>|IM,i»nMW> kpl ItabHUy or ropomMltr for Ifet Kaw, o» pbtuoa or IWWIIHI at mi utamukm, wpmim. pracaa or proem dBdooxJ, or rcpraMO Dm Us OR «wM OM Mriaat prMMy ««M4 rhkb. Contents ABSTRACT 1 INTRODUCTION' i RESOURCE DESCRIPTION 2 ROCK BREAKAGE FOR IN SITU PROCESSING 5 Mining and Collapse Method 6 Chemical Explosive Method 6 Nuclear Explosive Method 7 Rl'BBLIZING OIL SHALE WITH NUCLEAR EXPLOSIVES 7 OiL SHALE RETORTING . 8 10-Ton Laramie Retort It 150-Ton Laramie Retort 12 Nuclear In Situ Concept 12 Application of Experimental Results to the In Situ Process .... 13 UNDERGROUND PLUMBING 15 Pressure Drop in Chimney 15 Pressure Drop in Air Supply anc Exhaust Gas Holes ig Connection of Holes to Chimney ig ENVIRONMENTAL IMPACT OF IN SITU OIL SHALE DEVELOPMENT . 17 Hydrology lg Ground Motion 18 Radioactivity 22 COST PROJECTIONS 25 PROPERTIES OF OIL PRODUCED FROM OIL SHALE AND POSSIBLE PRETREATMENT REQUIRED 31 DEVELOPMENT OF NUCLEAR IN SITU RETORTING REQUIRED FOR COMMERCIAL APPLICATION 32 Retorting Process • • • 32 Effects of Nuclear Explosions on Oil Shale 33 Groundwater 33 History of Nuclear Development of Oil Shale 34 Government-Industry Impasse 34 CONCLUSIONS 35 ACKNOWLEDGMENTS 35 APPENDIX A - OIL SHALE RESOURCES OF THE GREEN RIVER FORMATION SUITABLE FOR NUCLEAR IN SITU PROCESSING 37 APPENDIX B - DEWATERING PLAN AND COST ESTIMATE .... 45 REFERENCES 51 -iii- NUCLEAR IN SITU RECOVERY OF OIL FROM OIL SHALE Abstract A plan is presented for production of Environmental problems such as oil by retorting oil shale in situ after the need to dispone of large volumes breaking it with underground nuclear ex­ of waste rock associated with con­ plosives. Reserves of oil shale of ventional mining and surface retort­ thickness and grade suitable (greater than ing of oil shale would be largely 20 gal/ton) for this process orcur in the avoided. Problems of seismic Piceance Creek Basin of Colorado, and ground motion and possible conlamina- are estimated to contain 640 billion 'ion of the oil and groundwater appear barrels of oil in place. Cost projections manageable. indicate that this nil could be produced at The necessity for government action a price ranging from $2.00 to $3.30 at the arising from federal ownership of the wellhead with a 20% rate of return on resource as well as the requirement for a investment (discounted cash flow). The significant government contribution to the price and production rate vary with oil development of the nuclear in situ re­ shale thickness. At a rate of 32 nuclear torting technology requires either govern­ chimneys per year in oil shale ranging in ment development of the resource or a thickness from 1000 to 2000 ft, production policy defining how industry and govern­ varies from 28 million bbl/yr (S3.30/bbl) ment may jointly develop it. The potential to 121 million bbl/yr ($2.00/bbl). Capital contribution to the energy resources of requirements for this in situ process are the nation is so large that this method estimated to be 20 times less than those of recovery from oil shale must be required by a surface retorting process. considered. Introduction The oil shale of the Green River Compared to conventional processes Formation in Colorado, Utah and of mining and surface treatment, Wyoming is the largest potential source in situ oil recovery offers potential of oil in the United States, including advantages including lower cost, a Alaska. Development of this resource larger resource suitable for development will become a necessity is coming years and a lesser adverse effect on the as the need for oil grows. environment. In situ processes are not as well developed In situ processing eliminates the need as conventional ones, but because of their to move the oil shale, the cost of proc­ potential advantages major attention should essing facilities is greatly reduced, and be devoted to their development. the problem of disposal of the spent T.vo things are essential to any in situ shale is eliminated. The low cost of process. First, the rock must be broken in situ retorting makes possible the so that most of the volume is near a treatment of large thicknesses of low- fracture surface along which Huids grade oil shale provided that it can be (mostly gases) may move freely. Second, broken economically. Therefore, the the rock must be heated to release the oil. cost of breaking the rotk in situ becomes The most widely considered process important. is rubblization of the rock using either Conventional mining processes are explosive or mining techniques, followed expensive and must utilize the highest by the introduction of air to provide heat grade possible to be economic. An by itt situ combustion of part of the or­ assessment of the oil shale resource ganic material in the oil shale. The hot suitable for in situ processing indicates gases produced by the combustion move that it occurs in large thicknesses of ahead of the combustion zone and release a low grade. Therefore, if a nuclear the bulk of the oil from iUe shale. The in situ technology can be developed suc­ oil is then collected and pu mped to the cessfully, the U.S. oil reserves can be surface. dramatically increased. Resource Description The oil shale of the Green River presented in Appendix A and are sum­ Formation is a dolomitic marlstone marized in Table 2 and Fig. 2. rather than a shale, although it is shale­ Several significant conclusions can be like in appearance. It was deposited in drawn from these summaries: lakes of Tertiary age, and single hori­ 1. Almost if not all the oil shale zons may be traced for miles in Colorado, meeting our criteria for nuclear in situ Utah and Wyoming (see Fig. 1). The processing (more than 400 feet thick and organic matter, kerogen, is largely containing 20 gal/s. t. or more oil) is in solid and insoluble, and the porosity and the Piceance Creek Basin of Colorado. permeability of the rock are both low. 2. At least 720 billion barrels a 3 The composition of a typical oil shale con­ (115 X lo m ) of oil meeting these taining 25 gal/short ton (s. t.) of oil is criteria is in place. shown in Table 1. When heaied the kerogen 3. Increasing the thickness cutoff to decomposes, releasing a major part of the 800 ft reduces the resource size by only organic material as a petroleum- like liquid. 80 billion barrels. Estimates of the amount of oil in place 4. Decreasing the cutoff grade to as a function of thickness and grade are 15 gal/s. t. increases the resource by -2- UTAH Green River r I SAND WASH i Salt Lake City >^. U BASIN Explanation mm.v/. Area underlain by the Area underlain by oil shale Green River Formation more than 800 feet thick, which yields 20 gallons or more oil per ton of shale Fig. 1. Location of oil shale in Colorado, Utah and Wyoming. -3- Table 1. Typical composition of oil Thickness - m shale sections averaging 25 gal 0 122 244 366 488 610 732 of oil per ton in the Mahogany 1 1 zone of Colorado and Utah 240 (from Ref. 2). 223.3 Weight 200 - - percent Organic matter 150 - - Content of raw shale 13.8 Ultimate composition Carbon 80.5 10? 100 Hydrogen 10.3 - 77.1 Nitrogen 2.4 7i 9 Sulfur 1.0 50 Oxygen 5.8 •1 l Pri;e'barrel at 3 no 5.97 3.07 2.26 1.95 1.73 20 c discounted Total 0 100.0 coili flow rate 40 Mineral matter n L Content of raw shale 86.2 400 1200 2000 >-•-> 2000 Estimated mineral 800 1600 constituents Thickness — ft Carbonates, principally dolomite 48 Fig. 2. Oil in place in oil shale contain­ Feldspars 21 ing more than 20 gal/ton, versus thickness — Colorado. Quartz 13 Clays, principally illite 13 Analcite 4 (>800 ft thick and containing 20 gal/s.t.) Pyrite 1_ with the 160 billion barrels of oil in place Total 100 in the range 30-35 gal/s.
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