Secondary cracking characteristics of asphaltenes and insights into the reservoir unblocking during oil shale in-situ exploitation
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Abstract
In-situ conversion is essential for the development of oil shale resources. Reservoir blockage has been confirmed to be a technological bottleneck via laboratory-scale experiments and field tests. This issue arises from the precipitated asphaltene and its thickening effect on the pyrolysis oil. Promoting in-situ secondary cracking of asphaltene has the potential to mitigate blockage. However, the secondary cracking characteristics of asphaltene have not yet been determined. In this study, asphaltenes were obtained under different pyrolysis temperatures, atmospheres and duration times, their secondary cracking mechanisms were investigated. These findings demonstrate considerable mass loss and discrepant reaction processes across different asphaltenes. Firstly, the mass loss of asphaltenes exceeds 80% at 500 ◦C for all the samples, and the released space can restore reservoir permeability. Second, based on the evolution of the activation energies and pyrolysis gas components, the asphaltenes obtained under severe conversion conditions undergo pyrolysis defined by synchronous two-stage reactions, whereas the asphaltenes obtained under mild conversion conditions undergo pyrolysis defined by sequential three-stage reactions. Finally, a method for eliminating reservoir blockage was proposed based on the above theories, involving inhibiting asphaltene migration and promoting its in-situ secondary cracking by controlling the parameters of the heat-carrying fluid, thereby achieving an unaffected reservoir or reservoir self-unblocking. The obtained results can provide valuable references for the in-situ exploitation of oil shale.
Document Type: Original article
Cited as: Guo, W., Fan, C., Deng, S., Shui, H., Liu, Z. Secondary cracking characteristics of asphaltenes and insights into the reservoir unblocking during oil shale in-situ exploitation. Advances in Geo-Energy Research, 2025, 15(1): 13-26. https://doi.org/10.46690/ager.2025.01.03
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Aboyade, A. O., Carrier, M., Meyer, E. L., et al. Model fitting kinetic analysis and characterisation of the devolatilization of coal blends with corn and sugarcane residues. Thermochimica Acta, 2012, 530: 95-106.
Akmaz, S., Gurkaynak, M. A., Yasar, M. The effect of temperature on the molecular structure of Raman asphaltenes during pyrolysis. Journal of Analytical and Applied Pyrolysis, 2012, 96: 139-145.
Allix, P., Burnham, A., Fowler, T., et al. Coaxing oil from shale. Oilfield Review, 2010, 22(4): 4-15.
Brandt, A. R. Converting oil shale to liquid fuels: Energy inputs and greenhouse gas emissions of the Shell in situ conversion process. Environmental Science & Technology, 2008, 42(19): 7489-7495.
Braun, R. L., Burnham, A. K. Mathematical model of oil generation, degradation, and expulsion. Energy & Fuels, 1990, 4(2): 132-146.
Braun, R. L., Rothman, A. J. Oil-shale pyrolysis: Kinetics and mechanism of oil production. Fuel, 1975, 54(2): 129-131.
Douda, J., Alvarez, R., Bolaños, J. N. Characterization of Maya asphaltene and maltene by means of pyrolysis application. Energy & Fuels, 2008, 22(4): 2619-2628.
Fei, Y., Marshall, M., Jackson, W. R., et al. Evaluation of several methods of extraction of oil from a Jordanian oil shale. Fuel, 2012, 92(1): 281-287.
Gregorčič, G., Lightbody, G. Gaussian process approach for modelling of nonlinear systems. Engineering Applications of Artificial Intelligence, 2009, 22(4-5): 522-533.
Gu, J., Deng, S., Sun, Y., et al. Pyrolysis behavior and pyrolysate characteristics of Huadian oil shale kerogen catalyzed by nickel-modified montmorillonite. Advances in Geo-Energy Research, 2024, 11(3): 168-180.
Guo, W., Fan, C., Liu, Z., et al. Fates of pyrolysis oil components in the non-isothermal propped fractures during oil shale in situ pyrolysis exploitation. Energy, 2024, 288: 129851.
Guo, W., Shui, H., Liu, Z., et al. Reliability analysis of elastic graphite packer in heat injection well during oil shale in-situ conversion. Advances in Geo-Energy Research, 2023, 7(1): 28-38.
Guo, W., Yang, Q., Deng, S., et al. Experimental study of the autothermic pyrolysis in-situ conversion process (ATS) for oil shale recovery. Energy, 2022, 258: 124878.
Han, X., Kulaots, I., Jiang, X., et al. Review of oil shale semicoke and its combustion utilization. Fuel, 2014, 126: 143-161.
Hao, J., Che, Y., Tian, Y., et al. Thermal cracking characteristics and kinetics of oil sand bitumen and its SARA fractions by TG-FTIR. Energy & Fuels, 2017, 31(2): 1295-1309.
He, W., Sun, Y., Guo, W., et al. Controlling the in-situ conversion process of oil shale via geochemical methods: A case study on the Fuyu oil shale, China. Fuel Processing Technology, 2021, 219: 106876.
Hu, S., Wu, H., Liang, X., et al. A preliminary study on the eco-environmental geological issue of in-situ oil shale mining by a physical model. Chemosphere, 2022, 287: 131987.
Kang, S., Sun, Y., Qiao, M., et al. The enhancement on oil shale extraction of FeCl3 catalyst in subcritical water. Energy, 2022, 238: 121763.
Kang, Z., Zhao, Y., Yang, D. Review of oil shale in-situ conversion technology. Applied Energy, 2020a, 269: 115121.
Kang, Z., Zhao, Y., Yang, D., et al. A pilot investigation of pyrolysis from oil and gas extraction from oil shale by in-situ superheated steam injection. Journal Petroleum Science Engineering, 2020b, 186: 106785.
Khakimova, L., Bondarenko, T., Cheremisin, A., et al. High pressure air injection kinetic model for Bazhenov Shale Formation based on a set of oxidation studies. Journal of Petroleum Science and Engineering, 2019, 172: 1120-1132.
Khulbe, K. C., Sachdev, A. K., Mann, R. S., et al. TGA studies of asphaltenes derived from Cold-Lake (Canada) bitumen. Fuel Processing Technology, 1984, 8(3): 259-266.
Kumar, R., Bansal, V., Badhe, R. M., et al. Characterization of Indian origin oil shale using advanced analytical techniques. Fuel, 2013, 113: 610-616.
Lai, D., Zhan, J., Tian, Y., et al. Mechanism of kerogen pyrolysis in terms of chemical structure transformation. Fuel, 2017, 199: 504-511.
Li, R., Jin, B., Zhong, Z., et al. Research on biomass pyrolysis three-pseudocomponent model by Gaussian multi-peaks f itting. Acta Energiae Solaris Sinica, 2010, 31(7): 806-810.
Liu, Y., Yao, Q., Sun, M., et al. Selective preparation of light aromatic hydrocarbons from catalytic fast pyrolysis vapors of coal tar asphaltene over transition metal ion modified zeolites. Chinese Journal of Chemical Engineering, 2021, 35: 275-287.
Liu, Z., Sun, Y., Guo, W., et al. Reservoir-scale study of oil shale hydration swelling and thermal expansion after hydraulic fracturing. Journal of Petroleum Science and Engineering, 2020, 195: 107619.
Luo, C., Liu, H., Zhou, S., et al. Catalytic role of various clay minerals during the thermal reaction process with oxidized and pyrolyzed oils. Journal of Thermal Analysis and Calorimetry, 2024: 149: 8681-8691.
Martins, M. F., Salvador, S., Thovert, J. F., et al. Co-current combustion of oil shale-Part 2: Structure of the combustion front. Fuel, 2010, 89(1): 133-143.
Ma, S., Li, S., Zhang, Z., et al. The feasibility study of in situ conversion of oil shale based on calcium-oxide-based composite materia hydration exothermic reaction. Energies, 2024, 17(8): 1798.
Ma, W., Wang, S., Cui, J., et al. Thermal decomposition kinetic model of phenolic resin. Acta Physico-Chimica Sinica, 2008, 24(6): 1090-1094.
Metz, W. D. Oil shale: A huge resource of low-grade fuel. Science, 1974, 184(4143): 1271-1275.
Murugan, P., Mahinpey, N., Mani, T. Thermal cracking and combustion kinetics of asphaltenes derived from Fosterton oil. Fuel Processing Technology, 2009, 90(10): 1286-1291.
Na, J. G., Im, C. H., Chung, S. H., et al. Effect of oil shale retorting temperature on shale oil yield and properties. Fuel, 2012, 95: 131-135.
Nguimbi, G. R., Sun, Y., Guo, M., et al. Thermogravimetric and kinetic analysis on pyrolysis and combustion of oil shale under different oxygen concentration atmosphere. International Journal of Earth Sciences and Engineering, 2016, 9(1): 66-73.
Pan, Y., Zheng, L., Liu, Y., et al. A review of the current status of research on convection-heated in-situ extraction of unconventional oil and gas resources (oil shale). Journal of Analytical and Applied Pyrolysis, 2023, 175: 106200.
Pei, S., Huang, L., Zhang, L., et al. Experimental study on thermal cracking reactions of ultra-heavy oils during air injection assisted in-situ upgrading process. Journal of Petroleum Science and Engineering, 2020, 195: 107850.
Pei, S., Wang, Y., Zhang, L., et al. An innovative nitrogen injection assisted in-situ conversion process for oil shale recovery: Mechanism and reservoir simulation study. Journal of Petroleum Science and Engineering, 2018, 171: 507-515.
Qian, J., Wang, J., Li, S. Oil shale development in China. Oil Shale, 2003, 20(3): 356-359.
Qing, W., Wang, X., Shuo, P. Study on the structure, pyrolysis kinetics, gas release, reaction mechanism, and pathways of Fushun oil shale and kerogen in China. Fuel Processing Technology, 2022, 225: 107058.
Rüger, C. P., Neumann, A., Kösling, P., et al. Addressing thermal behavior and molecular architecture of asphaltenes by a thermal-optical carbon analyzer coupled to high-resolution mass spectrometry. Energy & Fuels, 2022, 36(17): 10177-10190.
Saitova, A., Strokin, S., Ancheyta, J. Evaluation and comparison of thermodynamic and kinetic parameters for oxidation and pyrolysis of Yarega heavy crude oil asphaltenes. Fuel, 2021, 297: 120703.
Shi, J., Ma, Y., Li, S., et al. Characteristics of Estonian oil shale kerogen and its pyrolysates with thermal bitumen as a pyrolytic intermediate. Energy & Fuels, 2017, 31(5): 4808-4816.
Sun, Y., Liu, Z., Li, Q., et al. Controlling groundwater infiltration by gas flooding for oil shale in situ pyrolysis exploitation. Journal of Petroleum Science and Engineering, 2019, 179: 444-454.
Tirado, A., Félix, G., Al-Muntaser, A. A., et al. Molecular asphaltene transformations during aquathermolysis of heavy crude oil: analysis of the literature data. Energy & Fuels, 2023, 37(11): 7927-7944.
Vyazovkin, S., Burnham, A. K., Criado, J. M., et al. ICTAC Kinetics Committee recommendations for performing kinetic computations on thermal analysis data. Thermochimica Acta, 2011, 520(1-2): 1-19.
Wang, L., Zhao, Y., Yang, D., et al. Effect of pyrolysis on oil shale using superheated steam: A case study on the Fushun oil shale, China. Fuel, 2019, 253: 1490-1498.
Wang, Q., Wang, X., Liu, H., et al. Study of the combustion mechanism of oil shale semi-coke with rice straw based on Gaussian multi-peak fitting and peak-to-peak methods. Oil Shale, 2013, 30(2): 157-172.
Wu, T., Xue, Q., Li, X., et al. Extraction of kerogen from oil shale with supercritical carbon dioxide: Molecular dynamics simulations. The Journal of Supercritical Fluids, 2016, 107: 499-506.
Xu, S., Sun, Y., Lü, X., et al. Effects of composition and pore evolution on thermophysical properties of Huadian oil shale in retorting and oxidizing pyrolysis. Fuel, 2021, 305: 121565.
Yang, Q., Zhang, X., Xu, S., et al. Low-temperature cocurrent oxidizing pyrolysis of oil shale: Study on the physicochemical properties, reactivity and exothermic characters of semi-coke as heat generation donor. Journal of Petroleum Science and Engineering, 2022, 216: 110726.
Yan, J., Jiang, X., Han, X. Study on the characteristics of the oil shale and shale char mixture pyrolysis. Energy & Fuels, 2009, 23(12): 5792-5797.
Zhu, C., Guo, W., Sun, Y., et al. Reaction mechanism and reservoir simulation study of the high-temperature nitrogen injection in-situ oil shale process: A case study in Songliao Basin, China. Fuel, 2022, 316: 123164.
DOI: https://doi.org/10.46690/ager.2025.01.03
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