Study of the residual carbon oxidation trigger mechanism in fractured oil shale formation under real condition

IF 6.4 2区工程技术 Q1 MECHANICS

International Communications in Heat and Mass Transfer Pub Date : 2024-11-23 DOI:10.1016/j.icheatmasstransfer.2024.108369

Wei Guo , Junfan Pan , Qinchuan Yang , Qiang Li , Sunhua Deng , Chaofan Zhu

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Abstract

The autothermic pyrolysis in-situ conversion process (ATS) has a considerable advantage in reducing the development costs of oil shale. However, the trigger mechanism of autothermic pyrolysis oxidation reaction in different fractured oil shale formations is not precise. This study conducts a one-dimensional residual carbon oxidation experiment on the oil shale sample, taking into account the overburden pressure. The trigger condition and parameters are determined through the energy analysis during residual carbon oxidation in the fractured oil shale. A trigger simulation model of autothermic pyrolysis oxidation reaction in different fractured oil shale formations is proposed and verified by the temperature field evolution. The results indicate that the heterogeneous oxidation reaction produces a high permeability channel in the oil shale formation, which can further improve the flow conductivity of the oil shale formation. The trigger threshold of the residual carbon oxidation reaction in the fractured oil shale formation was closely associated with the carbon residue concentration (> 2.59 × 10⁴ mol/m³), oxygen content (>15 %), and gas crossflow between the fracture and matrix (0.56–0.78). This study has important theoretical guiding significance for triggering and controlling the ATS.

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真实条件下裂缝油页岩地层残炭氧化触发机制研究

自热热解原位转化工艺（ATS）在降低油页岩开发成本方面具有相当大的优势。然而，自热热解氧化反应在不同裂缝油页岩地层中的触发机理并不精确。本研究在考虑覆盖层压力的情况下，对油页岩样品进行了一维残炭氧化实验。通过裂缝油页岩残炭氧化过程中的能量分析，确定了触发条件和参数。提出了不同断裂油页岩地层中自热热解氧化反应的触发模拟模型，并通过温度场演化进行了验证。结果表明，异相氧化反应在油页岩地层中产生了高渗透通道，可进一步提高油页岩地层的导流能力。裂缝油页岩地层中残炭氧化反应的触发阈值与残炭浓度（2.59×104 mol/m3）、氧含量（15%）以及裂缝与基质之间的气体横流（0.56-0.78）密切相关。该研究对触发和控制 ATS 具有重要的理论指导意义。

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来源期刊

International Communications in Heat and Mass Transfer 工程技术-力学

CiteScore

11.00

自引率

10.00%

发文量

648

审稿时长

32 days

期刊介绍： International Communications in Heat and Mass Transfer serves as a world forum for the rapid dissemination of new ideas, new measurement techniques, preliminary findings of ongoing investigations, discussions, and criticisms in the field of heat and mass transfer. Two types of manuscript will be considered for publication: communications (short reports of new work or discussions of work which has already been published) and summaries (abstracts of reports, theses or manuscripts which are too long for publication in full). Together with its companion publication, International Journal of Heat and Mass Transfer, with which it shares the same Board of Editors, this journal is read by research workers and engineers throughout the world.