摘要
碳酸盐岩热储是我国水热型地热资源开发的主战场,具有分布广、厚度大、易回灌等特点.目前的利用仅局限于碳酸盐岩热储顶部约200 m的强岩溶发育带,由于深部碳酸盐岩热储渗透性低、非均质性强,无法进行规模化开发利用.针对深部巨厚碳酸盐岩热储高效开发技术难题,采用综合测井与裂隙成像测井技术优选了目标增产层段,创新使用了水力喷射酸化压裂热储改造技术,该技术具有定点起裂、有效封隔、热储深穿透、改造体积大等特点.以雄安新区揭露碳酸盐岩热储层厚度最大的地热井D22为代表开展了现场热储改造试验,结果显示,目标层段3024~3174 m涌水量由改造前的4.72 m^(3)·h^(-1)增加到改造后的44.10 m^(3)·h^(-1),提高了8.3倍;单位涌水量由改造前的0.024 m^(3)·(h·m)^(-1)增加到改造后的0.745 m^(3)·(h·m)^(-1),提高了30倍;储层渗透系数由4.4×10^(-3)m·d^(-1)提高到了146.3×10^(-3)m·d^(-1);井口水温由改造前的60.0℃增加到66.5℃.试验研究表明,可通过热储改造提高深部巨厚碳酸盐岩热储的开发潜能.
Geothermal energy,as a clean and renewable resource distributed worldwide,has received extensive focus in recent years.With the improvement in drilling and logging technology,the depth of geothermal exploration has gradually increased.Carbonate reservoirs are presently the main layer for geothermal development and use in China that have the characteristics of wide distribution,large reserves,and easy reinjection.The current use is limited to the strong karst development zone,approximately 200 m at the top of the reservoirs.Because of the low permeability and strong heterogeneity,the deep carbonate geothermal reservoirs cannot be commercially developed.This study aims to solve the key technical problems of efficiently developing deep carbonate geothermal reservoirs with extreme thickness.The target section was selected by analyzing comprehensive logging and fracture imaging logging data.An innovative simulation technology combining hydraulic jetting and acid fracturing is developed,which has the characteristics of fixed-point fracturing,effective sealing,strong penetration,and a large stimulation range.A production enhancement test was conducted for carbonate geothermal wells in the following order:comprehensive logging,imaging logging,casing cementing,perforation,pumping test,small pressure test,hydraulic injection acid fracturing,pumping test(after fracturing),and other construction processes.Comprehensive logging is an effective means to interpret the macroscopic pore and permeability properties of a reservoir and can be used to initially select the target geothermal reservoir.Fracture imaging logging can provide a more intuitive understanding of fracture development and distribution characteristics.The results show that the fracture density of geothermal well D22 does not decrease substantially with increasing depth,and the fracture width tends to decrease with depth clearly.The experimental geothermal well D22,which has the largest thickness of carbonate geothermal reservoir exposed in the Xiong'an New Area,w
作者
马峰
王贵玲
朱喜
张薇
黎楚童
唐显春
余鸣潇
赵志宏
杨睿月
MA Feng;WANG Gui-ling;ZHU Xi;ZHANG Wei;LI Chu-tong;TANG Xian-chun;YU Ming-xiao;ZHAO Zhi-hong;YANG Rui-yue(The Institute of Hydrogeology and Environmental Geology,Chinese Academy of Geological Sciences,Shijiazhuang 050061,China;Technology Innovation Center for Geothermal&Hot Dry Rock Exploration and Development,Ministry of Natural Resources,Shijiazhuang 050061,China;China University of Petroleum,Beijing 102249,China;Sinoprobe Center,Ministry of Natural Resources,Chinese Academy of Geological Sciences,Beijing 100037,China;Tsinghua University,Beijing 100084,China)
出处
《工程科学学报》
EI
CSCD
北大核心
2022年第10期1789-1798,共10页
Chinese Journal of Engineering
基金
国家重点研发资助项目(2019YFB1504101)
国家自然科学基金资助项目(41602271,41741018,41877197)
中国地质调查资助项目(DD20189112)
基本科研业务费资助项目(JYYWF20181101)。
关键词
强化增产
碳酸盐岩热储
雄安新区
水力喷射
酸化压裂
enhanced stimulation
carbonate geothermal reservoir
Xiong'an New Area
hydraulic jetting
acid fracturing
