裂缝性油藏吸入毛管压力曲线研究及应用
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摘要
针对裂缝性亲水油藏吸入型毛管压力曲线测定困难的问题,利用渤海湾JS裂缝性油藏基质岩心,开展渗吸和油水相渗实验并建立相应数学模型,形成了受相渗约束的毛管压力曲线求解方法,反算了基质吸入型毛管压力曲线。结果表明:JS裂缝性油藏基质束缚水状态相应毛管压力为1. 9 MPa,与压汞实验结果基本一致。利用研究结果标定该油藏基质采收率为11. 1%,与静态渗吸实验基质采收率31. 6%对比,仍有较大的提高采收率空间。同时该曲线的应用有效提高了该油藏历史拟合精度,并指导油田不稳定注水,取得了显著的稳油控水效果。
Aiming at the difficulty in determining the sucking capillary pressure curve of fractured hydrophilic reservoirs,the imbibition and oil-water relative permeability experiments were carried out by using the matrix cores of JS fractured reservoir in Bohai Bay and the corresponding imbibition mathematical model was established. A method for solving the sucking capillary pressure curve constrained by the relative permeability curve was formed,and the matrix sucking type capillary pressure curve was inversely calculated. The results show that the capillary pressure in the irreducible water state of matrix in JS fractured reservoir is 1. 9 MPa,which is basically consistent with the result of mercury intrusion experiment. Based on the research results of the paper,the reservoir matrix recovery was 11. 1%,and compared with 31. 6% of the static imbibition experiment,there is still a large room for improvement of recovery factor. At the same time,the application of the sucking capillary pressure curve effectively improves the historical fitting accuracy of the fractured reservoir,and effectively guides the unstable water injection of the oil field,and a remarkable oil-stabilizing water-controlling effect has been achieved.
Aiming at the difficulty in determining the sucking capillary pressure curve of fractured hydrophilic reservoirs,the imbibition and oil-water relative permeability experiments were carried out by using the matrix cores of JS fractured reservoir in Bohai Bay and the corresponding imbibition mathematical model was established. A method for solving the sucking capillary pressure curve constrained by the relative permeability curve was formed,and the matrix sucking type capillary pressure curve was inversely calculated. The results show that the capillary pressure in the irreducible water state of matrix in JS fractured reservoir is 1. 9 MPa,which is basically consistent with the result of mercury intrusion experiment. Based on the research results of the paper,the reservoir matrix recovery was 11. 1%,and compared with 31. 6% of the static imbibition experiment,there is still a large room for improvement of recovery factor. At the same time,the application of the sucking capillary pressure curve effectively improves the historical fitting accuracy of the fractured reservoir,and effectively guides the unstable water injection of the oil field,and a remarkable oil-stabilizing water-controlling effect has been achieved.
引文
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[14]杨露,冯文光,李海鹏,等.毛管压力曲线与相渗曲线相互转化的分形实现[J].断块油气田,2008,15(2):64-66.YANG Lu,FENG Wenguang,LI Haipeng,et al. Fractal theory for transformation between capillary pressure curve and relative permeability curve[J]. Fault-Block Oil&Gas Field,2008,15(2):64-66.
[15]陈元千.相对渗透率曲线和毛管压力曲线的标准化方法[J].石油实验地质,1990,12(1):64-70.CHEN Yuanqian. Standardization on the curves of permeability and capillary pressure[J]. Petroleum Geology&Experiment,1990,12(1):64-70.
[2]童凯军,李波,戴卫华,等.渤海海域变质岩潜山油藏稀井网高效开发技术[J].石油勘探与开发,2017,44(4):590-599.TONG Kaijun,LI Bo,DAI Weihua,et al. Sparse well pattern and high-efficient development of metamorphic buried hills reservoirs in Bohai Sea area,China[J]. Petroleum Exploration and Development,2017,44(4):590-599.
[3]朱维耀.低渗透裂缝性砂岩油藏多孔介质渗吸机理研究[J].石油学报,2002,23(6):56-59.ZHU Weiyao. Spontaneous imbibition mechanism of flow through porous media and water flooding in low permeability fractured sandstone reservoir[J]. Acta Petrolei Sinica,2002,23(6):56-59.
[4]王家禄,刘玉章,陈茂谦.低渗透油藏裂缝动态渗吸机理实验研究[J].石油勘探与开发,2009,36(1):86-90.WANG Jialu,LIU Yuzhang,CHEN Maoqian. Experimental study on dynamic imbibition mechanism of low permeability reservoirs[J]. Petroleum Exploration and Development,2009,36(1):86-90.
[5]彭昱强,何顺利,郭尚平,等.岩心渗透率对亲水砂岩渗吸的影响[J].东北石油大学学报,2010,34(4):51-56.PENG Yuqiang,HE Shunli,GUO Shangping,et al. Effect of permeability of porous medium on spontaneous imbibition in water-wet sandstone[J]. Journal of Daqing Petroleum Institute,2010,34(4):51-56.
[6]杨胜来,李梅香,陈浩,等.裂缝性油藏水驱过程中基质的动用程度及基质贡献率[J].石油钻采工艺,2011,33(2):69-72.YANG Shenglai,LI Meixiang,CHEN Hao,et al. Study of the producing degree and contribution ratio of matrix in fractured reservoir during water flooding[J]. Oil Drilling&Production Technology,2011,33(2):69-72.
[7]杨胜来,李梅香,王立军,等.双重介质油藏基质动用程度及规律[J].中国石油大学学报(自然科学版),2011,35(1):98-101.YANG Shenglai,LI Meixiang,WANG Lijun,et al. Producing degree and law of matrix in dual-porosity reservoir[J]. Journal of China University of Petroleum,2011,35(1):98-101.
[8]王西江,刘其成,王恩辉,等.双重介质油藏物模实验技术及渗流特征研究[J].特种油气藏,2007,14(2):97-100.WANG Xijiang,LIU Qicheng,WANG Enhui,et al. Study on physical modeling and percolation characteristics in dual-media reservoirs[J]. Special Oil and Gas Reservoirs,2007,14(2):97-100.
[9]于春生,李闽,乔国安,等.多层长岩心水驱油实验数值模拟研究[J].断块油气田,2007,14(4):52-54.YU Chunsheng,LI Ming,QIAO Guoan,et al. Numerical simulation study on multi-layer water displacing oil test with long core[J]. Fault-Block Oil&Gas Field,2007,14(4):52-54.
[10]张红玲.裂缝性油藏中的渗吸作用及其影响因素研究[J].油气采收率技术,1999,6(2):51-55.ZHANG Hongling. Research on the imbibition and its effect factors of fractured reservoir[J]. Oil&Gas Recovery Technology,1999,6(2):51-55.
[11]姚同玉,李继山,王建,等.裂缝性低渗透油藏的渗吸机理及有利条件[J].吉林大学学报(工学版),2009,39(4):937-940.YAO Tongyu,LI Jishan,WANG Jian,et al. Mechanisms and optimal conditions of imbibition in naturally fractured low-permeability reservoir[J]. Journal of Jilin University(Engineering and Technology Edition),2009,39(4):937-940.
[12] MATTAX CC,KYTE J R. Imbibition oil recovery from fractured water driver reservoir[J]. SPEJ,1962:177-184.
[13]计秉玉,陈剑,周锡生,等.裂缝性低渗透油层渗吸作用的数学模型[J].清华大学学报(自然科学版),2002,42(6):711-713,726.JI Bingyu,CHEN Jian,ZHOU Xisheng,et al. Mathematical model of imbibition in fractured low permeability reservoirs[J]. Journal of Tsinghua University(Science and Technology),2002,42(6):711-713,726.
[14]杨露,冯文光,李海鹏,等.毛管压力曲线与相渗曲线相互转化的分形实现[J].断块油气田,2008,15(2):64-66.YANG Lu,FENG Wenguang,LI Haipeng,et al. Fractal theory for transformation between capillary pressure curve and relative permeability curve[J]. Fault-Block Oil&Gas Field,2008,15(2):64-66.
[15]陈元千.相对渗透率曲线和毛管压力曲线的标准化方法[J].石油实验地质,1990,12(1):64-70.CHEN Yuanqian. Standardization on the curves of permeability and capillary pressure[J]. Petroleum Geology&Experiment,1990,12(1):64-70.
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