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Research On Mechanical Propetries Of Oil Shale In Nong’an And Huadian And Key Parameters Of Hydraulic Fracturing And Fragmentation

Posted on:2013-11-09Degree:MasterType:Thesis
Country:ChinaCandidate:X C YanFull Text:PDF
GTID:2230330371483610Subject:Geological Engineering
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In recent years, as the global demand for oil continues to rise and the international oilprice continues to rise, countries around the world are actively looking for alternatives to oilresources. As alternatives to oil, oil shale has been paid more attention. It is importantpractical significance to develop oil shale on large scale. The world’s oil shale reserves areabout550billion tons, if they are converted into the oil of shale oil, whose reserves areequivalent to5.4times of the current recoverable proven natural crude oil. Because of theshortage of oil and gas resources in China, the national long-term scientific andtechnological development planning framework and the national "Eleventh Five-Year"Outline of the Plan clearly stated that it was priority to develop the technology of deep oiland gas resource exploration and exploitation and efficient development technology of large-scale and low-grade oil and gas resources, focusing on developing investigation andexploration of oil shale and other unconventional oil and gas resources, and promoting thediversification of exploration and development of oil and gas. A latest assessment of dataabout the world’s oil shale reserves shows that the Chinese oil shale reserves ranked thesecond place in the world. If we can fully develop the use of our oil shale resources, make itreasonable and efficient extraction of shale oil, and it will no doubt to play the role inpromoting economic and social development for our country.The in situ mining is a very promising and environment-friendly exploition technologyfor oil shale,whose key technical difficulties are to improve the heating efficiency of the oilshale formation. To increase the technology of in situ hydraulic and fragmentation wasproposed in the initial phase of in situ mining,which was against problems in the existing insitu oil shale mining technology. By theoretically analyzed this method of in situ mining,ifwe could make oil shale beds in the hole base formed cracks and broken into small pieces ofsize through hydraulic or other technical means, the heat transfer efficiency of small volumeof oil shale would be greatly improved. By analyzing and contrast the use of hydraulicfracturing in oil production, we assume that the heat transfer efficiency after in situ fracturewill be significant improvement than broken before.The research method that firstly make advantage of horizontal drilling technology and its corresponding crushing technology and hydraulic transmission technology for oil shale inthe burial location of oil shale, to form an underground space (broken space), and then usinga variety of technical measures on fracturing oil shale above this level length, so that makethe overall large volume of oil shale to form cracks is less to see so far. In this paper, byanalysis the principles and methods of hydraulic fracturing, with the combination ofparameter calculation method and acoustic and mechanical experiments and mechanical andphysical properties experiments of rock, we explore to study the process and parametercalculation for the technology of in situ fragmentation for oil shale firstly, and then in situfracturing. Mechanical properties change and failure criteria of oil shale in the effect of thestatic pressure will be study. Variation of the cracks open,the extension of pressure and thewidth of oil shale in the effect of hydraulic fracturing will be study. Through the research ofimpact factors and disciplines of oil shale in situ fragmentation,the physical failuremechanism of oil shale in the effect of various factors will be revealed. In a word,researchresults will be important academic significance and practical value for the purpose toincrease the oil shale in situ mining efficiency and to reduce the cost of in situ mining.Through the experiment of physical and mechanical properties, the compressivestrength, the tensile strength,the elasticity modulus and Poisson’s ratio and other originaldata,in both horizontal bedding orientation and vertical bedding direction, of oil shale inNong’an mining site were obtained and compared. According to relevant data of oil shale inNong’an and Huadian, the Biot coefficient, the average pressure and minimum principalstress and other parameters were calculated. The pressure of cracks open and extending aswell as the width of cracks and other parameters were determined. The direction of boreholehydraulic mining was determined. And the diameter of nozzle,the dynamic pressure,themaximum of caving capacity and other parameters of borehole hydraulic mining wereobtained.By theoretical analysis and calculation of parameters of the in situ fracturing process ofoil shale, combined with the formula of hydraulic fracturing and broken for oil shale, takingthe mechanical properties of oil shale in Nong’an and Huadian as the base, reference thehydraulic fracturing process in oil,the initial establishment of the technology process offirstly making advantage of horizontal drilling technology and its corresponding crushing technology and hydraulic transmission technology for oil shale in the burial location of oilshale, to form an underground space (broken space), and then using a variety of technicalmeasures on fracturing oil shale above this level length, so that make the overall largevolume of oil shale to form cracks is studied.
Keywords/Search Tags:Oil Shale, Mechanical Properties, In Situ Fracturing, In situ fragmentation, Process Parameters
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