童长兵,程时清,石立华,薛颖,石彬
TONG Changbing,CHENG Shiqing,SHI Lihua,XUE Ying,SHI Bin

• 1:中国石油大学(北京)石油工程学院
• 2:延长油田股份有限公司南泥湾采油厂
• 3:陕西延长石油(集团)有限责任公司研究院
• 4:西安思坦仪器股份有限公司

摘要(Abstract)：

目前针对致密油藏周期注水的室内实验和模型设计偏向宏观，较少涉及周期注水过程中微观作用机理等问题。为了更好地揭示周期注水过程中微观剩余油分布规律及其影响因素，设计了考虑非均质性与裂缝属性的玻璃刻蚀微观模型，利用微流控周期注水实验，分析了2种模型下的注入周期、注入速度对微观剩余油赋存类型及主要作用力的影响。结果表明：在非均质模型中，周期注水注入阶段主要动用簇状剩余油，停注阶段主要动用多孔剩余油，停注阶段的采收率提高幅度大于注入阶段；在裂缝模型中，周期注水注入阶段多孔状剩余油得到较好动用，停注阶段多孔状及柱状剩余油得到有效动用，停注阶段的剩余油动用幅度高于注入阶段。在“一注四采”工作制度下，2种模型下的周期注水参数变化规律相似，注入速度越大，水驱波及能力越强，周期注水效果越好；注入周期越短，波及体积越小，注入周期越长，注入水易沿着高渗方向推进，压力扰动不明显，基质中原油驱替效果较差。注入周期10 min，注入速度0.2μL/min时的开发效果最好。研究结果可为老油田高含水后期剩余油精细挖潜提供实验依据。
At present, indoor experiments and model designs for cyclic water injection in tight oil reservoirs tends to be macroscopic, with less attention paid to microscopic mechanisms involved in cyclic water injection process. In order to better reveal distribution law of microscopic remaining oil and its influencing factors during cyclic water injection process, a microscopic glass-etching model considering heterogeneity and fracture attribute is designed. Microfluidic cyclic-water injection experiments are used to anaylze the influence injection cycle and injection rate on microscopic remaining oil occurrence types and the main forces in 2 models. The results show that in heterogeneous model, the clustered remaining oil is mainly produced in injection stage of cyclic water injection, while porous remaining oil is mainly produced in injection-stopping stage, with incremental recovery in injection-stopping stage more than that in water injection stage. In fracture model, porous remaining oil is well produced in injection stage of cyclic water injection, while porous and columnar remaining oil is effectively produced in injection-stopping stage, with remaining oil production in injection-stopping stage more than that in water injection stage. Under the working system of “one injector, four producers”, variation laws of cyclic water injection parameters of 2 models are similar.The higher the injection rate is, the stronger the water flooding sweep capacity is, and the better the cyclic water injection effect is. The shorter the injection cycle is, the smaller the sweep volume is. The longer the injection cycle is, the easier the injected water advances along the high-permeability direction, with not obvious pressure disturbance and poor oil displacement effect in the matrix. When injection cycle is 10 min and injection rate is 0.2 μL/min, the development effect is best. The research provides experimental basis for fine tapping of remaining oil in late stage of high water-cut in mature oilfields.

关键词(KeyWords)： 致密油藏;微流控模型;周期注水;波及系数;微观实验
tight reservoir;microfluidic model;cyclic water injection;sweep coefficient;microscopic experiments

Abstract:

Keywords:

基金项目(Foundation): 陕西省自然科学基础研究计划（面上）项目“致密砂岩储层微观孔喉结构及薄膜流动对渗吸规律的影响”（2023-JC-YB-423）

作者(Author): 童长兵,程时清,石立华,薛颖,石彬
TONG Changbing,CHENG Shiqing,SHI Lihua,XUE Ying,SHI Bin

DOI: 10.19597/J.ISSN.1000-3754.202404007

参考文献(References)：

• [1]袁士义，王强.中国油田开发主体技术新进展与展望[J].石油勘探与开发，2018,45(4):657-668.YUAN Shiyi, WANG Qiang. New progress and prospect of oilfields development technologies in China[J].Petroleum Exploration and Development,2018,45(4):657-668.
• [2]康毅力，田键，罗平亚，等.致密油藏提高采收率技术瓶颈与发展策略[J].石油学报，2020,41(4):467-477.KANG Yili, TIAN Jian, LUO Pingya, et al. Technical bottlenecks and development strategies of enhancing recovery for tight oil reservoirs[J]. Acta Petrolei Sinica,2020,41(4):467-477.
• [3]高辉.特低渗透砂岩储层微观孔隙结构与渗流机理研究[D].西安：西北大学，2009.GAO Hui.Research on micro-pore structure and micro-flow mechanism of ultra-low permeability standstone reservoir[D]. Xi’an:Northwest University,2009.
• [4]蔡建超.多孔介质自发渗吸关键问题与思考[J].计算物理，2021,38(5):505-512.CAI Jianchao. Some key issues and thoughts on spontaneous imbibition in porous media[J]. Chinese Journal of Computational Physics,2021,38(5):505-512.
• [5]刘红英，李冀秋.低渗-致密储层微纳米孔喉分布及其对渗流的影响[J].非常规油气，2023,10(5):98-102.LIU Hongying, LI Jiqiu. Distribution of micro-nano pore throat and its influence on seepage in low permeability and tight oil reservoir[J]. Unconventional Oil&Gas,2023,10(5):98-102.
• [6]颜圣松，陈泽宇，李娟娟.裂缝性特低渗储层油水渗流特征研究[J].非常规油气，2021,8(3):58-65.YAN Shengsong, CHEN Zeyu, LI Juanjuan. Study on oil-water seepage characteristics of fractured ultra-low permeability reservoir[J]. Unconventional Oil&Gas, 2021,8(3):58-65.
• [7]解伟，石立华，吕迎红，等.特低渗透非均质油藏周期注水方案研究[J].非常规油气，2016,3(1):47-52.XIE Wei,SHI Lihua,LüYinghong,et al. Cyclic waterflooding scheme for heterogeneous reservoir of ultra-low permeability[J]. Unconventional Oil&Gas,2016,3(1):47-52.
• [8]李留杰，党海龙，贾自力，等.鄂尔多斯盆地特低渗油藏合理注水强度研究：以樊学油区长8油藏为例[J].非常规油气，2019,6(5):57-62.LI Liujie,DANG Hailong,JIA Zili,et al.Research of suitable water injection intensity for the ultra-low permeability reservoirs in Ordos Basin[J]. Unconventional Oil&Gas, 2019, 6(5):57-62.
• [9]冯永健.XC特低渗透油藏周期注水方式优化研究[D].北京：中国石油大学，2022.FENG Yongjian.Research on optimization of periodic water injection in XC ultra-low permeability reservoir[D].Beijing:China University of Petroleum,2022.
• [10]周晋冲，张彬，雷征东，等.低渗透油藏不稳定注水岩心实验及增油机理[J].新疆石油地质，2022,43(4):491-495.ZHOU Jinchong,ZHANG Bin,LEI Zhengdong,et al.Core experiment and stimulation mechanism of unstable waterflooding in low permeability reservoirs[J]. Xinjiang Petroleum Geology,2022,43(4):491-495.
• [11]张秋凯.特低渗油藏周期注水机理及应用研究[D].北京：中国石油大学，2020.ZHANG Qiukai. Study on the mechanism and application of cyclic water injection in ultra-low permeability reservoirs[D].Beijing:China University of Petroleum,2020.
• [12]康胜松，肖前华，高峰，等.特低渗油藏非稳态周期注水机理及应用[J].石油钻采工艺，2019,41(6):768-772,816.KANG Shengsong, XIAO Qianhua, GAO Feng, et al. Mechanism and application of transient cyclic water flooding in extra-low permeability oil reservoirs[J].Oil Drilling&Production Technology,2019,41(6):768-772,816.
• [13] CHATENEVER A,CALHOUN J C.Visual examinations of fluid behavior in porous media-PartⅠ[J].Journal of Petroleum Technology,1952,4(6):149-156.
• [14]郭尚平，黄延章，周娟，等.物理化学渗流微观机理[M].北京：科学出版社，1990.GUO Shangping,HUANG Yanzhang,ZHOU Juan,et al. Microscopic mechanism of physical and chemical seepage[M].Beijing:Science Press,1990.
• [15]朱维耀.多相混合渗流理论研究[J].工程科学学报，2023,45(5):833-839.ZHU Weiyao.Study on the theory of multiphase mixed seepage in porous media[J]. Chinese Journal of Engineering, 2023, 45(5):833-839.
• [16]钟俊杰，王曾定，孙志刚，等.基于纳米流控技术的页岩储层微观流体特征研究进展[J].石油学报，2023,44(1):207-222.ZHONG Junjie, WANG Zengding, SUN Zhigang, et al. Research advances in microscale fluid characteristics of shale reservoirs based on nanofluidic technology[J].Acta Petrolei Sinica,2023,44(1):207-222.
• [17]肖文联，杨玉斌，李闽，等.鄂尔多斯盆地不同类型储集层水驱油特征实验[J].石油勘探与开发，2021, 48(4):807-816.XIAO Wenlian, YANG Yubin, LI Min, et al. Experimental study on the oil production characteristics during the waterflooding of different types of reservoirs in Ordos Basin,NW China[J]. Petroleum Exploration and Development,2021,48(4):807-816.
• [18]石立华.特低渗油藏注水开发机理及精细注水调控研究[D].北京：中国石油大学，2022.SHI Lihua.Study on water injection development mechanism and fine water injection control in ultra-low permeability reservoir[D].Beijing:China University of Petroleum,2022.
• [19]石立华，程时清，常毓文，等.致密油藏微观渗吸试验及数值模拟[J].中国石油大学学报（自然科学版），2022,46(1):111-119.SHI Lihua,CHENG Shiqing,CHANG Yuwen,et al.Microscopic experiment and numerical simulation of spontaneous imbibition in tight oil reservoirs[J].Journal of China University of Petroleum(Edition of Natural Science),2022,46(1):111-119.
• [20]石立华，魏登峰，常毓文，等.基于微流控模型的致密油藏微观渗吸机制试验[J].中国石油大学学报（自然科学版），2024,48(2):99-108.SHI Lihua,WEI Dengfeng,CHANG Yuwen,et al. Experiment on micro imbibition mechanisms of tight reservoirs based on a microfluidic model[J]. Journal of China University of Petroleum(Edition of Natural Science),2024,48(2):99-108.
• [21]王瑞，张红，王建，等.不同注采方式下层间非均质储层微观剩余油动用状况[J].大庆石油地质与开发，2023,42(5):82-89.WANG Rui,ZHANG Hong,WANG Jian,et al. Analysis of producing status of microscopic remaining oil in interlayer heterogeneous reservoirs by different injection-production methods[J].Petroleum Geology&Oilfield Development in Daqing,2023,42(5):82-89.
• [22]王吉涛，李俊键.高含水油田剩余油研究方法、分布特征与发展趋势[J].油气地质与采收率，2024,31(2):58-69.WANG Jitao,LI Junjian.Research methods,distribution characteristics, and development trend of remaining oil in high water cut oilfields[J]. Petroleum Geology and Recovery Efficiency,2024,31(2):58-69.
• [23]吴飞鹏，李娜，杨维，等.水力脉动波驱动微观剩余油实验与机理分析[J].石油勘探与开发，2022,49(6):1217-1226.WU Feipeng,LI Na,YANG Wei,et al.Experimental characterization and mechanism analysis of hydraulic pulsation waves driving microscopic residual oil[J]. Petroleum Exploration and Development,2022,49(6):1217-1226.
• [24]冯洋，杨国旗，李颖涛，等.基于砂岩岩心模型的微观水驱油渗流规律和剩余油赋存状态实验[J].非常规油气，2022,9(4):98-106.FENG Yang, YANG Guoqi, LI Yingtao, et al. Experiment of microscopic water flooding seepage law and remaining oil occurrence state based on sandstone core model[J]. Unconventional Oil&Gas,2022,9(4):98-106.
• [25]赵文景，王敬，钱其豪，等.非均质油藏水驱优势渗流通道演化规律[J].断块油气田，2023,30(5):847-856.ZHAO Wenjing, WANG Jing, QIAN Qihao, et al. Evolution law of dominant flow channels of water flooding in heterogeneous reservoir[J]. Fault-Block Oil&Gas Field, 2023, 30(5):847-856.