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原油浸泡对煤微观孔隙结构特征的影响研究

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为研究原油浸泡对煤体孔隙结构的影响,首先选用典型煤油伴生矿井煤样,对煤样进行不同天数的原油浸泡处理;然后采用压汞、低温氮吸附等仪器,研究浸油前后煤的孔隙形态、类型、孔容积及比表面积等变化特征,并结合扫描电镜(SEM)揭示原油侵入煤体的微观机制.研究表明:煤样通过原油浸泡后,进退汞曲线及低温吸脱附曲线均有滞后环且明显的滞后现象,煤样的微小孔隙由原来的平行板孔转为尖劈形孔,孔隙间连通性变差.随着浸油天数的增加,原油浸泡对煤孔隙影响明显,与原煤样相比,煤样的总孔容积降低32％～80％,其中大孔、中孔孔容下降程度显著;煤样的总孔比表面积降低87％～94％,其中小孔、微孔比表面积下降程度显著;原油在煤体中的流动大致分为较大孔裂隙的贯通-中大孔的填充-微小孔隙的堵塞等3部分.
Effect of crude oil immersion on micropore structure of coal
In order to study the change law of coal pore structure after crude oil immersion,typical coal samples associated with kerosene mine were selected and immersed in crude oil for different days.The changes of pore morphology,type,pore volume and specific surface area of coal before and after oil immersion were studied by mercury intrusion method and low temperature nitrogen adsorption method,and the microscopic mechanism of crude oil invading coal was revealed by scanning electron microscope(SEM).The research shows that after the coal sample is immersed in crude oil,the mercury entry and exit curve and the low temperature adsorption and desorption curve have obvious weakening trends.The tiny pores of the coal sample change from the original parallel plate pores to the wedge-shaped pores,and the connectivity between the pores becomes worse.With the increase of oil immersion days,the effect of crude oil immersion on coal porosity is obvious.Compared with raw coal samples,the total pore volume of coal samples is reduced by 32％-80％,and the pore volume of macropores and mesopores decreases significantly.The total pore specific surface area of coal samples decreases by 87％-94％,and the specific surface area of small pores and micropores decreases significantly.The flow of crude oil in coal can be roughly divided into three parts:the penetration of large pores and fractures-the filling of medium and large pores-the blockage of small pores.

crude oil immersionoil-immersed coal samplepore structurepore morphologypore volumespecific surface area

双海清、魏萌萌、白杨、张瑾、田雨、张星

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西安科技大学安全科学与工程学院,陕西西安 710054

煤炭行业西部矿井瓦斯智能抽采工程研究中心,陕西西安 710054

西部煤矿瓦斯灾害防控陕西省高等学校重点实验室,陕西西安 710054

原油浸泡 浸油煤样 孔隙结构 孔隙形态 孔容 孔比表面积

国家自然科学基金资助中国博士后科学基金资助中国博士后科学基金资助陕西省自然科学基金青年项目资助陕西省教育厅青年创新团队项目

519042382019M663937XB2022MD7137952022JQ-34722JP048

2023

10.16265/j.cnki.issn1003-3033.2023.12.2396

中国安全科学学报
中国职业安全健康协会

中国安全科学学报

CSTPCDCSCD北大核心
影响因子：1.548
ISSN：1003-3033
年,卷(期)：2023.33(12)
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