黄陵矿区富油煤对流加热原位转化开发效果数值模拟  

Numerical simulation on development effect of tar-rich coal through in-situ conversion by convective heating in Huangling Mining Area

作　　者：董光顺 朱超凡 厉家宗 徐绍涛 郭威[1,2,3,4] DONG Guangshun;ZHU Chaofan;LI Jiazong;XU Shaotao;GUO Wei(College of Construction Engineering,Jilin University,Changchun 130026,China;National-Local Joint Engineering Laboratory of In-situ Conversion,Drilling and Exploitation Technology for Oil Shale,Jilin University,Changchun 130026,China;Provincial and Ministerial Co-construction of Collaborative Innovation Center for Shale Oil&Gas Exploration and Development,Changchun 130026,China;Key Lab of Ministry of Natural Resources for Drilling and Exploitation Technology in Complex Conditions,Jilin University,Changchun 130026,China)

机构地区：[1]吉林大学建设工程学院,吉林长春130026 [2]油页岩地下原位转化与钻采技术国家地方联合工程实验室,吉林长春130026 [3]页岩油气资源勘探开发省部共建协同创新中心,吉林长春130026 [4]自然资源部复杂条件钻采技术重点实验室,吉林长春130026

出　　处：《煤田地质与勘探》2023年第4期57-67,共11页Coal Geology & Exploration

基　　金：国家重点研发计划项目课题(2019YFA0705502);吉林省中青年科技创新卓越团队项目(20220508135RC);吉林省发展和改革委员会自主创新能力建设项目(2022C021)。

摘　　要：有效开发富油煤提取石油对缓解我国油气紧张具有重要的现实意义,地下原位开采对流加热技术是富油煤有效开发的主要技术之一。以黄陵矿区延安组富油煤层为例,将高温蒸汽和氮气作为加热介质,采用地下原位转化开采对流加热的技术手段,分别研究2种加热介质在不同注入压力下的开采效果与能量回报率。结果表明:当注入气体的温度为400℃时,注蒸汽开采的加热效率更高,相同注入压力下注蒸汽开采将地层干酪根开采完所需要的时间小于注入高温氮气,二者比例为0.52~0.68,节省时间效果明显,注蒸汽开采与注氮气开采的天然气总产量比例为1.07~1.11,油总产量比例为0.82~0.85,二者差值随注入压力的增加而逐渐减小。注蒸汽开采与注氮气开采的能量回报率比例为1.754~2.363,注蒸汽开采注入压力为6 MPa时能量回报率在4.99 a达到峰值1.796,注氮气开采均未达到能量正收益。无论哪种加热介质,增加注入压力都能够缩短加热反应时间,有利于提高注蒸汽能量回报率。注氮气开采的地层流体有效渗透率较高,利于油气在地层中流动。注蒸汽开采在富油煤清洁开采方面具有优越性,为富油煤清洁开采的具体生产过程提供一定的数据参考依据。The effective development of tar-rich coal to extract oil is of great practical significance to alleviate the oil and gas tension in China,and the convective heating technology of underground in-situ mining is one of the main technologies for the effective development of tar-rich coal.Herein,the mining effect and energy return rate of the two heating media(high-temperature steam and nitrogen)under different injection pressures were studied by convective heating technology for underground in-situ conversion mining based on the tar-rich coal seam of Yan'an Formation in Huangling Mining Area.The results show that:the heating efficiency of steam injection mining is higher when the injected gas is at 400℃.Besides,the time required for steam injection mining to finish the extraction of stratum kerogen is less than that of high-temperature nitrogen injection under the same injection pressure,and the ratio of the two is 0.52‒0.68,with obvi ous time saving effect.Meanwhile,the ratio of total gas production by steam injection mining to that by nitrogen injection mining is 1.07‒1.11,while the ratio of total gas production is 0.82‒0.85,and the difference between the two values decreases with the increase of injection pressure.In addition,the ratio of energy return rate of steam injection mining and nitrogen injection mining is 1.754‒2.363.Specifically,the energy return rate of steam injection mining reaches a peak of 1.796 at 4.99 a at an injection pressure of 6 MPa,but no positive energy return is obtained by nitrogen injection mining.Regardless of the heating medium,increasing the injection pressure could shorten the heating reaction time,which is conducive to improving the energy return rate of steam injection.However,the effective permeability of formation fluids in nitrogen injection mining is high,which could facilitate the flow of oil and gas in the formation.Generally,steam injection mining has superiority in clean mining of tar-rich coal,and provides some data reference basis for the specific production pr

关 键 词：对流加热 注蒸汽热采 注氮气原位转化 富油煤 黄陵矿区 

分 类 号：P618.13[天文地球—矿床学]