王国锋,胡勇,奎明清,焦春艳,王继平,郭长敏,张园园,李娅,陈璐瑶
WANG Guofeng,HU Yong,KUI Mingqing,JIAO Chunyan,WANG Jiping,GUO Changmin,ZHANG Yuanyuan,LI Ya,CHEN Luyao

• 1:中国石油南方石油勘探开发有限公司
• 2:中国石油勘探开发研究院
• 3:中国石油天然气成藏与开发重点实验室
• 4:中国石油青海油田公司

摘要(Abstract)：

在渗流力学分析基础上建立了多层同源气驱水实验方法，揭示多孔岩石中天然气渗流规律和含水砂岩气藏水封气形成的临界力学条件。选用鄂尔多斯盆地苏里格气田天然岩心，根据气井钻遇纵向储层物性分布特征进行并联组合，开展了完全饱和水条件下岩心同源逐级增压气驱水实验。结果表明：天然气流动路径与储层渗透率和气驱水压力大小密切相关，在特定气驱水压力条件下，天然气优先选择高渗岩心流动，随着气驱水压力逐级增加，逐级覆盖低渗致密岩心；在基质渗透率小于4.77×10~(-3)μm~2的储层，尤其是基质渗透率小于等于1.0×10~(-3)μm~2的储层，气驱水临界流动压差与渗透率存在良好的幂函数关系；随着储层渗透率的降低，气驱水临界流动压差反而增大，在气藏衰竭开采过程中，当地层压力下降至无法突破水封阻力时，容易形成水封气。研究成果可为气藏剩余气评价和补能降阻解水封提高采收率提供依据。
A multi-layers homologous gas driving water experimental method is established based on fluid flow mechanics analysis, revealing natural gas flow law in porous rocks and critical mechanical conditions for the formation of water-trapped gas in water-bearing sandstone gas reservoirs. Natural cores from Sulige gas field in Ordos Basin are selected, and parallelly combined based on vertical distribution characteristics of gas well drilled reservoir properties. Homologous stepwised pressurized gas driving water experiments are carried out for completely water-saturated cores. The results show that gas flow path is closely related to reservoir permeability and the pressure of gas driving water. In specific gas driving water pressure conditions, gas flows preferentially through cores with high permeability, and gradually covers low-permeability tight cores with stepwised increase of gas driving water pressure. Critical flow pressure difference of gas driving water has good power function relationship with permeability in reservoirs with matrix permeability of <4.77×10~(-3) μm~2, especially those with matrix permeability of ≤1.0×10~(-3) μm~2, while increases with reservoir permeability decrease. Formation pressure decrease during depletion production of gas reservoirs cannot break through water trapping resistance, causing water-trapped gas easily formed. The research provides basis for evaluation of remaining gas in reservoirs and recovery improvement through energy replenishing, resistance reducing and water-trap removal.

关键词(KeyWords)： 多孔岩石;天然气;择优渗流;水封气;提高采收率;实验研究
porous rock;natural gas;preferential flow;water-trapped gas;improve recovery;experimental study

Abstract:

Keywords:

基金项目(Foundation): 中国石油天然气集团有限公司青海油田公司科技项目“涩北气田40亿方压舱石工程配套技术”（2023KJ10）

作者(Author): 王国锋,胡勇,奎明清,焦春艳,王继平,郭长敏,张园园,李娅,陈璐瑶
WANG Guofeng,HU Yong,KUI Mingqing,JIAO Chunyan,WANG Jiping,GUO Changmin,ZHANG Yuanyuan,LI Ya,CHEN Luyao

DOI: 10.19597/J.ISSN.1000-3754.202309062

参考文献(References)：

• [1]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. Physicochemical seepage:Micro mechanism[M]. Beijing:Science Press,1990.
• [2]葛家理.现代油藏渗流力学原理[M].北京：石油工业出版社，2003.GE Jiali. The modern mechanics of fluids flow in oil reservoir[M]. Beijing:Petroleum Industry Press,2003.
• [3]马新华.非常规天然气“极限动用”开发理论与实践[J].石油勘探与开发，2021,48(2):326-336.MA Xinhua.“Extreme utilization”development theory of unconventional natural gas[J]. Petroleum Exploration and Development,2021,48(2):326-336.
• [4]姚军，孙海，黄朝琴，等.页岩气藏开发中的关键力学问题[J].中国科学：物理学力学天文学，2013, 43(12):1527-1547.YAO Jun,SUN Hai,HUANG Zhaoqin,et al. Key mechanical problems in the development of shale gas reservoirs[J]. Scientia Sinica:Physica,Mechanica&Astronomica,2013,43(12):1527-1547.
• [5]张华珍，徐海云，张焕芝，等. 2022国外油气田开发技术进展[J].世界石油工业，2023,30(3):53-60.ZHANG Huazhen, XU Haiyun, ZHANG Huanzhi, et al.Progress of oil and gas field development technologies in 2022[J].World Petroleum Industry,2023,30(3):53-60.
• [6]姚军，孙海，李爱芬，等.现代油气渗流力学体系及其发展趋势[J].科学通报，2018,63(4):425-451.YAO Jun,SUN Hai,LI Aifen,et al. Modern system of multiphase flow in porous media and its development trend[J].Chinese Science Bulletin,2018,63(4):425-451.
• [7] HU Y,LI X Z,JIAO C Y,et al. Preferential seepage mechanism of gas and water inside the micronano pore throats of tight sandstone[C]. Rio de Janeiro:International Gas Union Research Conference,2017.
• [8]吕金龙，卢祥国，王威，等.致密砂岩孔隙中气水分布规律可视化实验[J].特种油气藏，2019,26(4):136-141.LüJinlong,LU Xiangguo,WANG Wei,et al. Visual test of gaswater distribution in tight sandstone pores[J]. Special Oil&Gas Reservoirs,2019,26(4):136-141.
• [9] JEONG N. Advanced study about the permeability for micro-porous structures using the Lattice Boltzmann method[J]. Transport in Porous Media,2010,83(2):271-288.
• [10] SUN H F,VEGA S,GUO T. Analysis of heterogeneity and permeability anisotropy in carbonate rock samples using digital rock physics[J]. Journal of Petroleum Science and Engineering,2017,156(7):419-429.
• [11]隋微波，权子涵，侯亚南，等.利用数字岩心抽象孔隙模型计算孔隙体积压缩系数[J].石油勘探与开发，2020,47(3):564-572.SUI Weibo,QUAN Zihan,HOU Ya’nan,et al. Estimating pore volume compressibility by spheroidal pore modeling of digital rocks[J]. Petroleum Exploration and Development, 2020,47(3):564-572.
• [12]王沫然，王梓岩.地下深层岩石微纳米孔隙内气体渗流的多尺度模拟与分析[J].地球科学，2018,43(5):1792-1816.WANG Moran,WANG Ziyan. Multiscale simulation and analysis for gas flow in deep-seated micronano pore[J]. Earth Science,2018,43(5):1792-1816.
• [13]李熙喆，万玉金，陆家亮，等.复杂气藏开发技术[M].北京：石油工业出版社，2010.LI Xizhe,WAN Yujin,LU Jialiang,et al. Complex gas reservoir development technology[M]. Beijing:Petroleum Industry Press,2010.
• [14]胡勇，李熙喆，万玉金，等.致密砂岩气渗流特征物理模拟[J].石油勘探与开发，2013,40(5):580-584.HU Yong,LI Xizhe,WAN Yujin,et al. Physical simulation on gas percolation in tight sandstone[J]. Petroleum Exploration and Development,2013,40(5):580-584.
• [15]丁景辰，杨胜来，史云清，等.致密气藏动态启动压力梯度实验研究[J].油气地质与采收率，2017,24(5):64-69.DING Jingchen,YANG Shenglai,SHI Yunqing,et al. Experimental study on dynamic threshold pressure gradient of tight gas reservoir[J]. Petroleum Geology and Recovery Efficiency,2017,24(5):64-69.
• [16]公言杰，柳少波，姜林，等.致密砂岩气非达西渗流规律与机制实验研究：以四川盆地须家河组为例[J].天然气地球科学，2014,25(6):804-809.GONG Yanjie, LIU Shaobo, JIANG Lin, et al. Experimental study of seepage characteristic and mechanism in tight gas sands:A case from Xujiahe reservoir of Sichuan Basin[J]. Natural Gas Geoscience,2014,25(6):804-809.
• [17]陈维余，刘同敬，温守国，等.应力敏感裂缝型储层多相渗流规律实验[J].石油钻采工艺，2022,44(4):450-460.CHEN Weiyu, LIU Tongjing, WEN Shouguo, et al. Experiment on multiphase flow rules in stress-sensitive fractured reservoirs[J]. Oil Drilling&Production Technology, 2022,44(4):450-460.
• [18]张烈辉，熊钰，赵玉龙，等.用于致密气提高采收率的储集层干化方法[J].石油勘探与开发，2022,49(1):125-135.ZHANG Liehui,XIONG Yu,ZHAO Yulong,et al. A reservoir drying method for enhancing recovery of tight gas[J]. Petroleum Exploration and Development,2022,49(1):125-135.
• [19]胡勇，郭长敏，徐轩，等.砂岩气藏岩石孔喉结构及渗流特征[J].石油实验地质，2015,37(3):390-393.HU Yong,GUO Changmin,XU Xuan,et al. Pore throat structure and flow characteristics of sandstone reservoirs[J]. Petroleum Geology&Experiment,2015,37(3):390-393.
• [20]孟婧，张莉莹，李芮，等.致密砂岩储层微观孔隙结构特征及其分类评价[J].特种油气藏，2023,30(4):71-78.MENG Jing, ZHANG Liying, LI Rui, et al. Microscopic pore structure characteristics of tight sandstone reservoirs and its classification evaluation[J]. Special Oil&Gas Reservoir, 2023,30(4):71-78.
• [21]胡勇，李熙喆，卢祥国，等.砂岩气藏衰竭开采过程中含水饱和度变化规律[J].石油勘探与开发，2014,41(6):723-726.HU Yong,LI Xizhe,LU Xiangguo,et al. Varying law of water saturation in the depletion-drive development of sandstone gas reservoirs[J]. Petroleum Exploration and Development, 2014,41(6):723-726.
• [22]胡勇，李熙喆，徐轩，等．含水致密砂岩气藏可动用储量评价新方法及其应用[J].石油学报，2021,42(3):332-340.HU Yong,LI Xizhe,XU Xuan,et al. A new evaluation method for recoverable reserves of water-bearing tight sandstone gas reservoir and its application[J]. Acta Petrolei Sinica, 2021,42(3):332-340.
• [23]李熙喆，卢德唐，罗瑞兰，等.复杂多孔介质主流通道定量判识标准[J].石油勘探与开发，2019,46(5):943-949.LI Xizhe,LU Detang,LUO Ruilan,et al. Quantitative criteria for identifying main flow channels in complex porous media[J].Petroleum Exploration and Development, 2019, 46(5):943-949.
• [24]姚广聚，彭红利，熊钰，等.低渗透砂岩气藏气体渗流特征[J].油气地质与采收率，2009,16(4):104-105,108.YAO Guangju,PENG Hongli,XIONG Yu,et al. Research on characteristics of gas flowing in low permeability sandstone gas reservoirs[J]. Petroleum Geology and Recovery Efficiency,2009,16(4):104-105,108.
• [25]任晓娟，阎庆来，何秋轩，等.低渗气层气体的渗流特征实验研究[J].西安石油学院学报（自然科学版），1997,39(3):22-25.REN Xiaojuan,YAN Qinglai,HE Qiuxuan,et al. The experimental study of characteristics of gas flow in tight formation[J].Journal of Xi’an Shiyou University(Natural Science Edition),1997,39(3):22-25.
• [26]李昊远，庞强，魏克颖，等.致密砂岩储层孔隙结构分形特征对气水渗流规律的影响：以苏里格气田东南部桃2区块山1段为例[J].断块油气田，2023,30(2):177-185.LI Haoyuan, PANG Qiang, WEI Keying, et al. Influence of pore structure fractal features of tight sandstone reservoir on gaswater seepage law:A case study of Shan 1 Member in Tao 2block of southeastern Sulige gas field[J]. Fault-Block Oil&Gas Field,2023,30(2):177-185.
• [27]李熙喆，胡勇，徐轩，等.致密砂岩气开发机理研究与应用[M].北京：科学出版社，2021.LI Xizhe,HU Yong,XU Xuan,et al. Research and application of tight sandstone gas development mechanism[M]. Beijing:Science Press,2021.