注烟道气提高页岩气采收率实验——以鄂尔多斯盆地MZ气田为例  

Experiment on improving shale gas recovery by flue gas injection:Taking MZ Gas Field in Ordos Basin as an example

作　　者：闫方平 郭永伟 单秀华 陈颖超 曹梦菁 褚会丽 王晶 张笑洋 YAN Fangping;GUO Yongwei;SHAN Xiuhua;CHEN Yingchao;CAO Mengjing;CHU Huili;WANG Jing;ZHANG Xiaoyang(Hebei Technical College of Petroleum Profession,Chengde 066700,China;Chengde Oil and Gas Field Artificial Intelligence Engineering Technology Research Center,Chengde 066700,China)

机构地区：[1]河北石油职业技术大学,河北承德066700 [2]承德市油气田人工智能工程技术研究中心,河北承德066700

出　　处：《大庆石油地质与开发》2022年第4期146-153,共8页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家科技重大专项“超深层及中新元古界油气资源形成保持机制与分布预测”(2011ZX05004)。

摘　　要：为了明确注烟道气提高页岩吸附气采收率机理,利用低场核磁共振T_(2)谱测试方法,开展了等温吸附实验和注CO_(2)/SO_(2)解吸实验,评价了目标储层页岩对CO_(2)、SO_(2)、CH_(4)和C_(2)H_(6)的吸附能力,并通过微观孔隙结构研究了CO_(2)/SO_(2)作用下吸附态CH_(4)和吸附态C_(2)H_(6)的解吸效率和解吸速率。结果表明:目标储层页岩对SO_(2)吸附能力最强,C_(2)H_(6)和CO_(2)次之,CH_(4)吸附能力最差;SO_(2)作用下吸附态CH_(4)和C_(2)H_(6)的最大解吸速率分别为3.08%/h和2.29%/h,最大解吸效率分别为51.84%和29.89%;吸附态CH_(4)解吸过程与吸附态C_(2)H_(6)存在差异,吸附态C_(2)H_(6)的解吸速率会在注气初期立即达到最大,然后逐渐降低,而吸附态CH_(4)的解吸速率则呈现出先逐渐增大后快速降低的趋势;增加平衡时间可以提高吸附态CH_(4)的解吸速率,但不能增大吸附态C_(2)H_(6)的解吸速率。建议矿场实施中采用烟道气吞吐方式开采CH_(4)含量高的轻质页岩气,采用烟道气驱替方式开采富含C_(2+)以上重烃的页岩气。研究成果为鄂尔多斯盆地页岩气高效合理开发提供了理论指导。In order to clarify mechanism of flue gas injection to enhance shale adsorbed gas recovery,with the help of low-field nuclear-magnetic-resonance(NMR)T_(2) spectrum test method,isothermal adsorption experiment and CO_(2)/SO_(2) injection desorption experiment are carried out.Adsorption capacities of shale in target reservoir to CO_(2),SO_(2),CH_(4) and C_(2)H_(6) are evaluated,and their desorption efficiencies and desorption rates of adsorbed CH_(4) and adsorbed C_(2)H_(6) under action of CO_(2)/SO_(2) are studied in micro pore structure.The study shows that shale in target reservoir has highest adsorption capacity to SO_(2),secondly to C_(2)H_(6) and CO_(2),and lowest to CH_(4).Effectted by SO_(2),maximum desorption rates of CH_(4) and C_(2)H_(6) are 3.08%/h and 2.29%/h,respectively,and their maximum desorption efficiencies are 51.84%and 29.89%,respectively.Desorption process of adsorbed CH_(4) is different from that of adsorbed C_(2)H_(6),desorption rate of adsorbed C_(2)H_(6) reaches the maximum at the beginning of gas injection,and then decrease gradually.Desorption rate of adsorbed CH_(4) shows a trend of gradual increase and rapid decrease.Desorption rate of adsorbed CH_(4) can be increased by increasing equilibrium time,but desorption rate of adsorbed C_(2)H_(6) cannot be increased.In field operation,it is suggested that light shale gas with high CH_(4) content can be produced by the way of flue gas huff and puff,and shale gas rich in heavy hydrocarbon above C_(2)+can be produced by the way of flue gas flooding.The research provides theoretical guidance for high-efficiency and rational development of shale gas in Ordos Basin.

关 键 词：页岩气 烟道气 吸附态 核磁共振 解吸效率 

分 类 号：TE377[石油与天然气工程—油气田开发工程]