煤田地质与勘探2024，Vol.52Issue(2)：180-196,17.DOI:10.12363/issn.1001-1986.23.09.0562
煤炭地下气化试验综述与产业化发展建议
Underground coal gasification:Overview of field tests and suggestions for industrialization
摘要
Abstract
Driven by the dual demands for achieving the goals of peak carbon dioxide emissions and carbon neutrality and for ensuring national energy security,underground coal gasification(UCG)in China is embracing a new historical development opportunity.To scientifically formulate a route for making technological breakthroughs in UCG and accel-erate its industrialization,this study analyzed the history of UCG field tests,dividing UCG into three stages:UCG based on coal mines,vertical/directional wells,and horizontal wells.By exploring the underlying logic that propelled innova-tions in UCG technologies in different stages,this study delved into the technical and non-technical reasons for the fail-ure of UCG industrialization and finally proposed suggestions.Key findings are as follows:(1)The UCG technology combining horizontal wells with the controlled retracting injection point(CRIP)process can effectively avoid the risks of surface subsidence and freshwater pollution caused by shallow gasification.Furthermore,this technology enjoys advant-ages in terms of expanding the vertical coal mining range,increasing single-well-controlled coals,improving the quality of raw gas,and ensuring continuous gasification.Hence,this technology serves as a mainstream technical route cur-rently and in the future.(2)After the longest field test period,China has remained long in the stage of UGS based on coal mines.Although China is still in the initial stage of tests for breakthroughs in moderately deep UCG,it roughly keeps the same pace with other major coal-rich countries in terms of technical research and development due to the chal-lenging technology research and low technological maturity.Therefore,China is expected to overtake these countries in the technology for UCG based on drilled wells.(3)Regarding technical reasons,limited technology applicability poses challenges in the industrialization of UCG based on coal mines and vertical wells,while low technological maturity pre-dominantly restricts the industrialization of UGS based on horizontal wells.Consequently,long-term stable and high gas production is yet to be achieved.(4)Concerning non-technical reasons,the termination of UCG tests abroad is primarily caused by low-cost production of conventional natural gas,the influence of the shale gas revolution,public concerns about environmental pollution caused by shallow gasification,and governments'UCG policy shift.In contrast,China's UCG industrialization is principally hindered by a prolonged gap in development planning,relatively limited entities en-gaging in scientific research and tests,insufficient investment in scientific research,a lack of industrial support policies,and the absence of joint innovation mechanisms.This study proposed suggestions for China's UCG industrialization.In the new era,it is necessary to thoroughly identify the complexity and challenges of UCG technology.Then,great efforts should made to achieve long-term stable production with considerably high quality.It is recommended that the technolo-gical maturity should be constantly improved through synchronous scientific research and field tests.The cascade pro-duction mode featuring physical gas extraction followed by chemical gasification should be employed to avoid competi-tion with coalbed methane production.Meanwhile,it is necessary to actively explore the utilization mode that integrates oil and gas,new energy,and coal chemical industry for elevated economic benefits.As a revolutionary production tech-nology for artificially created gas reservoirs,UCG,after successful achievement,can provide a technical reference for the fluidization exploitation of other mineral resources and push China's unconventional technology for fossil energy de-velopment to a new level.关键词
煤炭地下气化/中深层煤/钻井式气化/产业化/技术原因/产业政策/发展建议Key words
underground coal gasification(UCG)/moderately deep coal/gasification based on coal mines/industrializa-tion/technical reason/industrial policy/development suggestion分类
矿业与冶金引用本文复制引用
东振,喻岳钰,龚万兴,孙宏亮,王兴刚,陈艳鹏,孔令峰,王峰,陈浩,薛俊杰,张梦媛,陈姗姗,赵宇峰..煤炭地下气化试验综述与产业化发展建议[J].煤田地质与勘探,2024,52(2):180-196,17.基金项目
中石油"煤炭地下气化关键技术研究与先导试验"基础性前瞻性项目(2019E-25) （2019E-25）
中石油"低碳能源生态圈战略研究"项目(中油研20230118-4) （中油研20230118-4）
