煤炭地下气化井工程关键技术新进展  

New progress in key technologies of underground coal gasification well engineering

作　　者：袁光杰 李晓璇 刘奕杉 张谧 YUAN Guangjie;LI Xiaoxuan;LIU Yishan;ZHANG Mi(CNPC Engineering Technology R&D Company Limited,Beijing 102206,China;National Engineering Research Center of Oil&Gas Drilling and Completion Technology,Beijing 102206,China;CNPC Offshore Engineering Company Limited,Beijing 100028,China)

机构地区：[1]中国石油集团工程技术研究院有限公司,北京市102206 [2]油气钻完井技术国家工程研究中心 [3]中国石油海洋工程有限公司

出　　处：《天然气工业》2024年第10期195-208,共14页Natural Gas Industry

基　　金：国家自然科学基金资助项目“深部煤层原位超临界水气化关键技术基础研究”(编号:U23B2088);中国石油集团公司直属院所基础研究和战略储备技术研究基金项目“深层煤炭超临界水原位气化方法研究”(编号:2023DQ03-05)。

摘　　要：开展煤炭地下气化关键技术研究对于推动煤炭行业的可持续发展以及国家“双碳”目标的实现具有重要意义,井工程作为其核心部分正面临一系列关键技术挑战。为此,聚焦煤炭地下气化井工程,从气化工艺选择、井筒完整性研究、高效点火与可控燃烧、井筒温度场预测与控制方面回顾了煤炭地下气化工艺的发展历程,系统总结了井工程面临的问题和技术新进展,提出了促进井工程技术发展的建议。研究结果表明:①气化工艺优化、井筒完整性、高效点火及燃烧、井筒温度场预测与控制是煤炭地下原位气化面临的关键技术难题;②煤炭气化工艺由有井式向无井式、单口垂直井向多口水平井的方向发展,其对井筒完整性与耐腐蚀性提出了更高的要求;③点火可控燃烧系统逐渐向更安全更高效的方向发展,还需深化气化过程的温度场分布规律认识,通过多学科交叉融合精准预测和调控气化工艺参数;④加速多场耦合条件下的理论研究,积极研发耐高温高压腐蚀的相关材料及工具,完善多目标优化的煤炭气化工艺优选方法,结合人工智能预测将是未来深层煤炭地下气化井工程的关键发展方向。结论认为,强化煤炭地下气化与多领域融合发展,能够为煤炭地下气化先导试验和天然气增储上产提供技术支撑,并加速煤炭资源向绿色、清洁、高效利用转型,助力能源结构优化与可持续发展。The research on the key technologies of underground coal gasification(UCG)is of great significance in promoting the sustainable development of the coal industry and the achievement of the national"dual-carbon"goals.As one core part of UCG,well engineering is confronted with a series of critical technological challenges.Focusing on the well engineering of UCG,this paper reviews the development history of UCG processes from the aspects of process selection,wellbore integrity study,efficient ignition and controllable combustion,as well as prediction and control of wellbore temperature field,systematically summarizes the challenges to well engineering and the new technological progress,and proposes enhancing technological development of well engineering.And the following research results are obtained.First,the key technical challenges to in-situ UCG include gasification process optimization,wellbore integrity,efficient ignition and combustion,and wellbore temperature field prediction and control.Second,the development of UCG processes from shaft UCG to no-shaft UCG and from a single vertical well to multiple horizontal wells imposes higher requirements for wellbore stability and corrosion resistance.Third,the ignition and controllable combustion system is gradually advancing towards enhanced safety and efficiency,and it is necessary to further understand the distribution laws of temperature field in the gasification process and accurately predict and control the process parameters through interdisciplinary integration.Fourth,the future well engineering of deep UCG shall follow the key developmental direction of accelerating theoretical research under multi-field coupling conditions,actively developing the materials and tools resistant to high temperature,high pressure and corrosion,improving the multi-objective optimization based UCG process selection method,and integrating artificial intelligence prediction.In conclusion,enhancing the integrated development of UCG with multiple fields can provide technical support f

关 键 词：煤炭地下气化 井工程 气化工艺 井筒完整性 可控燃烧 温度场预测 余热利用 

分 类 号：TQ546[化学工程—煤化学工程]