Experimental investigation on the hydrocarbon generation of low maturity organic-rich shale in supercritical water

Dong, Y; Guo, Liejin; Jin, H; Wang, Y; Xie, Tingli; Zhao, Qiuyang

doi:10.3176/oil.2022.3.02

Cited by 9 publications

(3 citation statements)

References 40 publications

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“…SCW has a stronger ability to dissolve organic compounds. Xie studied the hydrocarbon generation efficiency and pyrolysis products of organic-rich shale under SCW and effectively concluded insights into the mechanism of SCW in favor of organic carbon utilization. , Wang studied the effects of different extraction conditions on pyrolysis products using isothermal subcritical water extraction technology and concluded that subcritical water possessed the effects of catalytic pyrolysis and extraction solvent . Pyrolysis kinetics is also an effective analytic method to investigate shale pyrolysis behaviors.…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis Mechanism and Reservoir Simulation Study of Organic-Rich Shale during the In Situ Conversion via Supercritical Water Heating

Liu,

Yao,

Meng

et al. 2024

Energy Fuels

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The low-medium maturity shale reservoir has garnered substantial interest because of its huge reserves and promising hydrocarbon generation potential. In this paper, a self-designed high-temperature and pressure pyrolysis experiment device was constructed. Experiments involving thermogravimetric pyrolysis and isothermal pyrolysis in supercritical water (SCW) environments were carried out on samples from the Longkou shale. The effect of SCW on organic-rich shale pyrolysis was understood by comparing the product characteristics of shale pyrolysis in SCW environments with dry environments. The complete kinetic models of kerogen pyrolysis in dry and SCW environments were established by fitting the composition characteristics of pyrolysis products using the nonlinear least-squares method. The numerical simulation of shale in situ conversion via SCW injection and electrical heating was investigated, and the performance evolution of thermal-reactive flow coupling was clarified. The results showed that SCW reduced the main temperature window of kerogen pyrolysis, and the total mass loss increased by 46.29% compared to that in a dry environment. SCW promoted the generation and subsequent release of pyrolysis hydrocarbons. SCW altered the compositional profile of the generated products, mainly by increasing CO 2 content in pyrolysis gas, reducing olefin content, and effectively improving oil quality compared with the dry environment. SCW reduced the activation energy of kerogen pyrolysis by 41.65%, indicating that the reaction is more easily activated. More hydrocarbon products and less coke were generated. The superiority of kinetic models holds significant practical implications for the application of SCW heating organic-rich shale in situ conversion technology. The shale in situ conversion via SCW greatly shortened the production cycle and improved cumulative oil. Kerogen within the interwell region was completely pyrolyzed, the reservoir porosity increased to 2 times of the original value, and permeability was enhanced by 10 times after shale in situ conversion via SCW for 3 years.

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Section: Introductionmentioning

confidence: 99%

Pyrolysis Mechanism and Reservoir Simulation Study of Organic-Rich Shale during the In Situ Conversion via Supercritical Water Heating

Liu,

Yao,

Meng

et al. 2024

Energy Fuels

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“…In recent years, the technology of hydrocarbon generation from medium- and low-maturity organic-rich shale in supercritical water conversion has been given much attention. − The thermal degradation of medium- and low-maturity organic-rich shale to produce hydrocarbon is a complex physicochemical process, − which results in a wide variety of products, which makes it difficult to determine the kinetic law and mechanism of pyrolysis. In addition, supercritical water was introduced into the transformation of medium- and low-maturity organic-rich shale to generate hydrocarbons, which undoubtedly made the pyrolysis process more complicated.…”

Section: Introductionmentioning

confidence: 99%

Reaction Kinetics Study on Hydrocarbon Generation of Medium- and Low-Maturity Organic-Rich Shale in Supercritical Water

Xie,

Zhao,

Jin

et al. 2023

Energy Fuels

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In this study, the dominant path of hydrocarbon generation in supercritical water of granular medium- and low-maturity organic-rich shale is determined as well as the mechanism of supercritical water in the process of hydrocarbon generation of granular medium- and low-maturity organic-rich shale. The kinetics of hydrocarbon generation in supercritical water from granular medium- and low-maturity organic-rich shale was studied. A dynamic model of the hydrocarbon generation reaction of granular medium- to low-maturity organic-rich shale in supercritical water was constructed. The Runge–Kutta fourth-order algorithm and basin hopping algorithm were used to solve the fitting parameters. The model consisted of 11 parallel first-order reactions, which could accurately predict the mass fraction of the hydrocarbon generation products of granular medium- and low-maturity organic-rich shale in supercritical water and reveal the mechanism of the hydrocarbon generation reaction of medium- and low-maturity organic-rich shale in supercritical water. It was found that the hydrocarbon generation pathways of granular medium- and low-maturity organic-rich shale in supercritical water mainly consisted of direct generation of asphaltenes and saturated hydrocarbons from kerogen, pyrolysis of asphaltenes to saturated hydrocarbons, aromatic hydrocarbons, and resins, polymerization of resins to asphaltenes, and gas generation from saturated hydrocarbons, resins, and asphaltenes. The role of supercritical water facilitated the direct generation of saturated hydrocarbons from kerogen.

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“…Low maturity organic-rich shale (LMOS) is an important part of oil shale resources, and its material composition mainly includes inorganic minerals, a large amount of solid kerogen, and a small number of mobile hydrocarbons. , The bottleneck of its effective development lies in how to accelerate the production of oil and gas from kerogen. , For this reason, people put forward a lot of heat conversion technologies as the core, such as electric heating technology, fluid heating technology, radiation heating technology, combustion heating technology, and so on . Among them, fluid heating technology uses the heat transfer mode of heat convection and conduction, which has the advantages of high heating efficiency and supplement of reservoir driving energy.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Organic Carbon Migration Path and Pore Evolution during Co-thermal Hydrocarbon Generation of Low Maturity Organic-Rich Shale and Supercritical Water

et al. 2022

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In this study, a non-isothermal heating reactor was used to simulate the hydrocarbon generation of 1−4 cm-sized low maturity organic-rich shale under the action of supercritical water. Under the condition of maintaining a pressure of 24 MPa, a mass ratio of water to shale 1:1, and a total reaction time of 2.5 h, the effects of different temperature conditions (380−450 °C) on hydrocarbon generation efficiency, organic carbon migration ratio, and pore permeability characteristics were investigated. The results showed that the oil production rate first increased and then decreased, and gas production rate continued to increase with increasing temperature. In the range of 380−450 °C, the oil production rate reached a maximum of 4.2 kg oil•t −1 shale at 430 °C, and the gas production rate reached a maximum of 36.02 m 3 gas•t −1 shale at 450 °C. Increasing temperature would promote the increase in the relative content of heavy components in oil. The selectivity of hydrogen and methane was promoted, while carbon dioxide was inhibited by increasing temperature. The distribution proportion of organic carbon in the oil-phase products and wastewater gradually decreased, while the distribution proportion in the gas-phase products increased with the increase in temperature. The porosity, permeability, and specific surface area of shale all increased with the increase in temperature. The increase in porosity caused by increasing temperature less than 430 °C was attributed to the fact that increasing temperature promotes the conversion and release of organic matter and the development of microfractures. The increase in porosity by increasing temperature more than 430 °C was only due to the development of microfractures.

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Experimental investigation on the hydrocarbon generation of low maturity organic-rich shale in supercritical water

Cited by 9 publications

References 40 publications

Pyrolysis Mechanism and Reservoir Simulation Study of Organic-Rich Shale during the In Situ Conversion via Supercritical Water Heating

Pyrolysis Mechanism and Reservoir Simulation Study of Organic-Rich Shale during the In Situ Conversion via Supercritical Water Heating

Reaction Kinetics Study on Hydrocarbon Generation of Medium- and Low-Maturity Organic-Rich Shale in Supercritical Water

Experimental Investigation on the Organic Carbon Migration Path and Pore Evolution during Co-thermal Hydrocarbon Generation of Low Maturity Organic-Rich Shale and Supercritical Water

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