摘要
【目的】陕北富油煤地下原位热解先导试验在国内外尚属首次,开创了富油煤、油页岩等原位转化新方向,引起了行业内外广泛关注。富油煤地下原位热解的研究尚处于起步阶段,缺少现场工程数据的系统研究。【方法】通过现场先导试验,明确富油煤地下原位热解的地质条件和工程难点,总结陕北富油煤地下原位热解开采进展,探讨下一步技术攻关方向。【结果和结论】结果表明:(1)先导试验区具有煤层稳定、煤质条件好、煤焦油产率高、生油潜力大、煤系富水性弱、隔水层厚度大等优越的原位热解地质条件,但煤层孔隙连通性差、导流能力低、煤层导热能力差、高效加热难度大、煤层改造难度大、体积造缝要求高等因素影响到工程效果。(2)开展综合地质评价有利于规避地层水、断层等不利因素对地下热解过程的影响,可控冲击波致裂技术有助于地下煤层裂缝连通,井下高效电加热器稳定运行是高效产油的关键。(3)经过一个月加热运行,成功提取出全球第一桶地下原位热解油,初步打通了富油煤地下原位热解开采技术路径,获取了产油的地下温度、压力等工艺参数。先导试验存在加热周期短、产油量低、耗能高,缺少项目运行的系统性技术评价,需从研发高效井下电加热器、地下煤层体积造缝、热解−气化一体化、热能综合利用及集成CCS等方面继续升级技术,实现降本增效,综合提高富油煤地下原位热解开采的经济性、安全性和可靠性。
[Objective]The breakthrough of the pilot experiment for underground in-situ pyrolysis of tar-rich coal in the northern Shaanxi has added new vitality to the research on in-situ conversion of fossil energy such as tar-rich coal and oil shale,and the results have attracted wide attention both inside and outside the industry.The research on underground in-situ pyrolysis of tar rich coal is still in its infancy,lacking systematic research on field engineering data.[Methods]Based on the pilot experiment,the main geological conditions and engineering difficulties have been clarified,and the progress of underground in-situ pyrolysis has been summarized.The next technical breakthrough directions are also discussed.[Results and Conclusions]The results show that:(1)The superior geological conditions of the pilot experiment area,such as stable coal seams,good coal quality,high tar yield of coal seams,large oil generation potential,weak water-rich coal measures and large thickness of aquiclude.However,there are some factors affecting the engineering implementation,such as poor connectivity of coal seam pores,low diversion capacity,poor thermal conductivity of coal seams,difficulty in efficient heating,difficulty in coal reservoir reconstruction,and high requirements for volume.fracturing;(2)Comprehensive geological evaluation is conducive to avoiding the influence of unfavorable factors such as formation water and faults on the underground pyrolysis process.Controllable shock wave fracturing technology is helpful for the connectivity of underground coal seams.The stable operation of efficient underground electric heaters is the key to efficient oil production.(3)After one month of heating operation,the world's first barrel of underground insitu pyrolysis oil was extracted,which opened up the technical path of underground in-situ pyrolysis extraction of tarrich coal and initially obtained the underground temperature,pressure and other process parameters for efficient oil production.The pilot experiment has a short heating cycle,low oil production and high energy consumption,lacks a technical systematic evaluation of project operation.It is necessary to continue upgrading technologies in terms of developing efficient underground electric heaters,underground coal seam volume fracturing,pyrolysis-gasification integration,comprehensive utilization of heat energy and integrated CCS,so as to comprehensively improve the economy,safety and reliability of underground in-situ pyrolysis extraction of tar-rich coal.
作者
段中会
杨甫
王振东
马丽
段晓青
曹虎生
陈亮
DUAN Zhonghui;YANG Fu;WANG Zhendong;MA Li;DUAN Xiaoqing;CAO Husheng;CHEN Liang(Key Laboratory of Coal Resources Exploration and Comprehensive Utilization,Ministry of Natural Resources,Xi’an 710021,China;Shaanxi Coal Geology Group Co.,Ltd.,Xi’an 710021,China;Shaanxi 185 Coalfield Geology Co.,Ltd.,Yulin 719000,China)
出处
《煤田地质与勘探》
EI
CAS
CSCD
北大核心
2024年第7期14-24,共11页
Coal Geology & Exploration
基金
陕西省秦创原“科学家+工程师”队伍建设项目(KXJ-126)
陕西省煤田地质集团有限公司重大科研项目(SMDZ 2020ZD-1)
中国博士后基金项目(2023M732757)。
关键词
富油煤
地下原位热解
先导试验
热解−气化一体化
陕北
tar-rich coal
underground in-situ pyrolysis
pilot experiment
pyrolytic-gasification integration
northern Shaanxi Province
