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

• 1:河北石油职业技术大学
• 2:承德市油气田人工智能工程技术研究中心

摘要(Abstract)：

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_2H_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_2H_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_2H_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_2H_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_2H_6存在差异，吸附态 C_2H_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_2H_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_2spectrum test method,isothermal adsorption experiment and CO_2/SO_2injection desorption experiment are carried out. Adsorption capacities of shale in target reservoir to CO_2,SO_2,CH_4and C_2H_6are evaluated,and their desorption efficiencies and desorption rates of adsorbed CH_4and adsorbed C_2H_6under action of CO_2/SO_2are studied in micro pore structure. The study shows that shale in target reservoir has highest adsorption capacity to SO_2,secondly to C_2H_6and CO_2,and lowest to CH_4. Effectted by SO_2,maximum desorption rates of CH_4and C_2H_6are 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_4is different from that of adsorbed C_2H_(6,)desorption rate of adsorbed C_2H_6reaches the maximum at the beginning of gas injection,and then decrease gradually.Desorption rate of adsorbed CH_4shows a trend of gradual increase and rapid decrease. Desorption rate of adsorbed CH_4can be increased by increasing equilibrium time,but desorption rate of adsorbed C_2H_6cannot be increased. In field operation,it is suggested that light shale gas with high CH_4content 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(KeyWords)： 页岩气;烟道气;吸附态;核磁共振;解吸效率
shale gas;flue gas;adsorbed state;nuclear magnetic resonance(NMR);desorption efficiency

Abstract:

Keywords:

基金项目(Foundation): 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）

作者(Author): 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

DOI: 10.19597/j.issn.1000-3754.202107019

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