陈江,高宇,陈沥,雷艳,张洁,刁广智
CHEN Jiang,GAO Yu,CHEN Li,LEI Yan,ZHANG Jie,DIAO Guangzhi

• 1:中国石油长庆油田公司勘探开发研究院
• 2:低渗透油气田勘探开发国家工程实验室
• 3:中国石油川庆钻探长庆井下技术作业公司
• 4:中国石油长庆油田公司第五采油厂

摘要(Abstract)：

将CO_2注入页岩，不但能提高页岩油采收率，还能达到埋存CO_2的目的，但CO_2吞吐和埋存的影响因素较多且相互作用。为搞清楚页岩油CO_2非混相吞吐与埋存特征，通过开展页岩岩心CO_2吞吐、吸附实验，定量评价了CO_2注入压力、CO_2相态类型、储层温度、闷井时间、裂缝、吞吐次数对CO_2吞吐效果以及颗粒直径、CO_2注入压力、储层温度对CO_2埋存效果的影响程度。研究表明：增大注入压力不但有利于CO_2吞吐，还能增大吸附量；增加注入压力会诱导天然微裂缝的扩展、延伸，有利于扩大CO_2波及面积，减小原油渗流阻力；当储层温度小于50℃时，温度升高有利于提高吞吐采收率，但会降低CO_2吸附量；当温度大于等于50℃时，温度升高不利于CO_2吞吐和埋存；在超临界条件（7.4 MPa、31℃）下CO_2吞吐采收率最大，最佳闷井时间为10 h左右；裂缝扩展有助于提高吞吐采收率，CO_2吸附量受页岩颗粒直径影响很小。研究成果可为鄂尔多斯盆地页岩油CO_2吞吐及埋存提供借鉴。
CO_2 injection into shale can not only improve the recovery of shale oil,but also achieve the purpose of CO_2 storage.However,there are many and interactive factors affecting CO_2 huff-and-puff and CO_2 storage effect of shale oil.Through CO_2 huff-and-puff and adsorption experiments of shale core,the influence of CO_2 injection pressure,phase type,reservoir temperature,soaking time,fracture and huff-and-puff times on CO_2 huff-and-puff effect,as well as the influence of particle diameter,CO_2 injection pressure and temperature on CO_2 sequestration effect are evaluated quantitatively.The results show that increasing CO_2 injection pressure not only is conducive to CO_(2) huffand-puff,but also can increase CO_2 adsorption.Increasing injection pressure may induce the propagation and extension of natural microfractures,which is conducive to expanding CO_2 sweep area and reducing oil flow resistance.When reservoir temperature is<50℃，the increase of temperature is conducive to increasing recovery of CO_2 huffand-puff but decreases adsorption capacity,while when the temperature is≥50℃，the increase of temperature is not conducive to CO_2 huff-and-puff and sequestration.Under supercritical conditions(7.4 MPa,31℃)，the recovery rate of CO_2 huff-and-puff is the highest,and the optimal soaking time is about 10 h.Fractures propagation is helpful for improving recovery rate of huff-and-puff.CO_2 adsorption capacity is little affected by diameter of shale particles.The research provides reference for CO_2 huff-and-puff and sequestration of shale oil in Ordos Basin.

关键词(KeyWords)： 页岩;CO_2吞吐与埋存;影响因素;吸附
shale;CO_2 huff-and-puffand sequestration;influencing factors;adsorption

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项“鄂尔多斯盆地大型低渗透岩性地层油气藏开发示范工程”（2016ZX05050）

作者(Author): 陈江,高宇,陈沥,雷艳,张洁,刁广智
CHEN Jiang,GAO Yu,CHEN Li,LEI Yan,ZHANG Jie,DIAO Guangzhi

DOI: 10.19597/j.issn.1000-3754.202111038

参考文献(References)：

• [1]黄小亮，贾新锋，周翔，等.延长油田低渗透油藏长岩心二氧化碳吞吐参数优化[J].新疆石油地质，2015,36(3):313-316.HUANG Xiaoliang,JIA Xinfeng,ZHOU Xiang,et al. Optimization of long core CO2 huff and puff experimental parameters in low permeability reservoir, Yanchang Oilfield[J]. Xinjiang Petroleum Geology,2015,36(3):313-316.
• [2]王建海，李娣，曾文广，等.塔河缝洞型油藏氮气+二氧化碳吞吐先导试验[J].大庆石油地质与开发，2015,34(6):110-117.WANG Jianhai,LI Di,ZENG Wenguang,et al. Pilot test of N2and CO2 huff and puff in Tahe fractured vuggy reservoirs[J].Petroleum Geology&Oilfield Development in Daqing,2015,34(6):110-117.
• [3]肖娜，李实，林梅钦.CO2-水-岩石相互作用对岩石孔渗参数及孔隙结构的影响：以延长油田35-3井储层为例[J].油田化学，2018,35(1):85-90.XIAO Na,LI Shi,LIN Meiqin. Effect of CO2-water-rock interaction on porosity,permeability and pore structure characters of reservoir rock:A case study of 35-3 well in Yanchang Oilfield[J].Oilfield Chemistry,2018,35(1):85-90.
• [4]孙会珠，朱玉双，魏勇，等. CO2驱酸化溶蚀作用对原油采收率的影响机理[J].岩性油气藏，2020,32(4):136-142.SUN Huizhu, ZHU Yushuang, WEI Yong, et al. Influence mechanism of acidification on oil recovery during CO2 flooding[J].Lithologic Reservoirs,2020,32(4):136-142.
• [5]PAN Y,HUI D,LUO P Y,et al. Experimental investigation of the geochemical interactions between supercritical CO2 and shale:Implications for CO2 storage in gas-bearing shale formations[J].Energy&Fuels,2018,32:1963-1978.
• [6]MA Q Z,YANG S L,LüD P,et al. Experimental investigation on the influence factors and oil production distribution in different pore sizes during CO2 huff-n-puff in an ultra-high-pressure tight oil reservoir[J].Journal of Petroleum Science and Engineering,2019,178:1155-1163.
• [7]ABEDINI A,TORABI F. Oil recovery performance of immiscible and miscible CO2 huff-n-puff processes[J]. Energy Fuels,2014,28:774-784.
• [8]韩海水，李实，陈兴隆，等. CO2对原油烃组分膨胀效应的主控因素[J].石油学报，2016,37(3):392-398.HAN Haishui,LI Shi,CHEN Xinglong,et al. Main control factors of carbon dioxide on swelling effect of crude hydrocarbon components[J].Acta Petrolei Sinica,2016,37(3):392-398.
• [9]BOUZGARROU S,JEDLI H,STITI N,et al. Experimental adsorption and modelisation of CO2 on adsorbents collected from Elborma Field in South Tunisia[J].Journal of Surface Engineered Materials and Advanced Technology,2014,5(1):52-60.
• [10]LI L,WANG C W,LI D S,et al. Experimental investigation of shale oil recovery from Qianjiang core samples by the CO2 huff-npuff EOR method[J].RSC Advances,2019,9:28857-28869.
• [11]YU H Y,XU H,FU W R,et al. Extraction of shale oil with supercritical CO2:Effects of number of fractures and injection pressure[J].Fuel,2021,285:276-285.
• [12]贾连超，刘鹏飞，袁丹，等.注CO2提高页岩吸附气采收率实验：以鄂尔多斯盆地延长组长7页岩气为例[J].大庆石油地质与开发，2021,40(2):153-159.JIA Lianchao, LIU Pengfei, YUAN Dan, et al. Experiment of enhancing the recovery of the shale adsorbed gas by CO2 injection:Taking Yanchang-Formation Chang-7 shale gas in Ordos Basin as an example[J]. Petroleum Geology&Oilfield Development in Daqing,2021,42(2):153-159.
• [13]全国天然气标准化技术委员会.页岩甲烷等温吸附测定方法：第1部分容积法：GB/T 35210.1―2017[S].北京：中国标准出版社，2017.China National Gas Standardization Technology Committee. Determination methods of methane isothermal adsorption in shale-Part 1Capacity method:GB/T 35210.1―2017[S]. Beijing:Standards Press of China,2017.
• [14]WEI B,GAO K,ZHANG X,et al. Nuclear-magnetic-resonance monitoring of mass exchange in a low permeability matrix/fracture model during CO2 cyclic injection:A mechanistic study[J].SPE Journal,2019,25(1):440-450.
• [15]FAKHER S,IMQAM A. Application of carbon dioxide injection in shale oil reservoirs for increasing oil recovery and carbon dioxide storage[J].Fuel,2020,265:116-124.
• [16]胡伟，吕成远，王锐，等.水驱转CO2混相驱渗流机理及传质特征[J].石油学报，2018,39(2):201-209.HU Wei,LüChengyuan,WANG Rui,et al. Porous flow mechanism and mass transfer characteristics of CO2 miscible flooding after waterflooding[J].Acta Petrolei Sinica,2018,39(2):201-209.
• [17]WANG H T,LUN Z M,LüC Y,et al.Nuclear-magnetic-resonance study on mechanisms of oil mobilization in tight sandstone reservoir exposed to carbon dioxide[J].SPE Journal,2017,23(3):750-761.
• [18]LU Y Y,CHEN X Y,TANG J R,et al. Relationship between pore structure and mechanical properties of shale on supercritical carbon dioxide saturation[J].Energy,2019,172:270-285.
• [19]郎东江，伦增珉，吕成远，等.页岩油注二氧化碳提高采收率影响因素核磁共振实验[J].石油勘探与开发，2021,48(3):1-10.LANG Dongjiang,LUN Zengmin,LüChengyuan,et al. Nuclear magnetic resonance experimental study of CO2 injection to enhanced shale oil recovery[J].Petroleum Exploration and Development,2021,48(3):1-10.
• [20]贾瑞轩，孙灵辉，苏致新，等.二氧化碳吞吐致密油藏的可动用性[J].断块油气田，2020,27(4):504-508.JIA Ruixuan, SUN Linghui, SU Zhixin, et al. Availability of CO2 huff and puff in tight reservoir[J].Fault-Block Oil&Gas Field,2020,27(4):504-508.