清洁压裂液返排液对致密油藏自发渗吸驱油效果的影响
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摘要
针对清洁压裂液返排液回收利用率低、处理困难的问题,并结合致密油藏渗吸采油机理,以处理后的现场清洁压裂液返排液作为渗吸液,开展清洁压裂液返排液对致密油藏自发渗吸驱油效果的影响研究。结果表明:选择渗吸液浓度时,不仅要考虑降低黏附功、提高洗油效率,还要兼顾界面张力和润湿性对毛细管力的影响,当渗吸液质量分数为50%时,渗吸采收率最大可达27. 5%,此时毛细管力作为渗吸驱油的动力占据主导地位,渗吸强度较大;随着岩心渗透率增加和实验温度升高,渗吸采收率逐渐升高。天然岩心渗吸—核磁联测实验结果显示,2块天然岩心的渗吸采收率均可达到26%左右,渗吸初始阶段,油水置换速度较快,渗吸采收率迅速上升,20 h后渗吸速度下降直至渗吸结束。清洁压裂液返排液能够提高致密油藏自发渗吸采收率,为该类压裂液返排液重复利用提供了一种新思路。
Aiming at the problems of the low recovery-utilization rate and difficult to handle for the clean fracturing back-flow fluid,and combined with the imbibition oil producing mechanism in the tight reservoir,regarding the treated field clean fracturing back-flow fluid as the imbibing fluid,the influences of the clean fracturing back-flow fluid on the spontaneous imbibition and flooding effects of the tight oil reservoir were studied. The results show that when selecting the concentration of the imbibing liquid,reducing the adhesion work and improving the cleaned efficiency are not only considered,the impacts of the interfacial tension and wettability on the capillary force should be also taken into account,when the concentration of the imbibition is 50%,the maximum imbibition recovery can reach 27. 5%. At this time,the capillary force takes the dominant position for the imbibition oil flooding,the imbibition strength is pretty larger; with the increases of the core permeability and the experimental temperature,theimbibition recovery increases gradually. The results of the natural core imbibition-magnetic testing experiment show that both imbibition recoveries can up to 26% or so for two pieces of the natural core,at the initial stage of the imbibition,the oil-water replaced and displaced speed is greatly rapid,the imbibition recovery rises fast,after 20 h,the infiltration rate decreases until the end of the imbibition. The clean fracturing back-flow fluid can improve the spontaneous imbibition recovery of the tight oil reservoir,thus a new idea is provided for the reutilization of this type of back-flow fracturing fluid.
Aiming at the problems of the low recovery-utilization rate and difficult to handle for the clean fracturing back-flow fluid,and combined with the imbibition oil producing mechanism in the tight reservoir,regarding the treated field clean fracturing back-flow fluid as the imbibing fluid,the influences of the clean fracturing back-flow fluid on the spontaneous imbibition and flooding effects of the tight oil reservoir were studied. The results show that when selecting the concentration of the imbibing liquid,reducing the adhesion work and improving the cleaned efficiency are not only considered,the impacts of the interfacial tension and wettability on the capillary force should be also taken into account,when the concentration of the imbibition is 50%,the maximum imbibition recovery can reach 27. 5%. At this time,the capillary force takes the dominant position for the imbibition oil flooding,the imbibition strength is pretty larger; with the increases of the core permeability and the experimental temperature,theimbibition recovery increases gradually. The results of the natural core imbibition-magnetic testing experiment show that both imbibition recoveries can up to 26% or so for two pieces of the natural core,at the initial stage of the imbibition,the oil-water replaced and displaced speed is greatly rapid,the imbibition recovery rises fast,after 20 h,the infiltration rate decreases until the end of the imbibition. The clean fracturing back-flow fluid can improve the spontaneous imbibition recovery of the tight oil reservoir,thus a new idea is provided for the reutilization of this type of back-flow fracturing fluid.
引文
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[2]闵春佳,卢双舫,唐明明,等.致密油储层水平井压裂参数优化模拟[J].断块油气田,2015,22(6):794-797.MIN Chunjia,LU Shuangfang,TANG Mingming,et al. Hydrofracturing parameter optimization and simulation of horizontal well in tight oil reservoir[J]. Fault-Block Oil and Gas Field,2015,22(6):794-797.
[3]司志梅,李爱芬,郭海萱,等.致密油藏压裂液滤液返排率影响因素室内实验[J].油气地质与采收率,2017,24(1):122-126.SI Zhimei,LI Aifen,GUO Haixuan,et al. Experimental study on the influencing factors of fracturing fluid flowback rate in tight reservoir[J]. Petroleum Geology and Recovery Efficiency,2017,24(1):122-126.
[4]徐黎明,王利明,牛小兵,等.致密油藏体积压裂水平井动用规律:以长庆油田为例[J].油气地质与采收率,2016,23(6):87-93.XU Liming, WANG Liming, NIU Xiaobing, et al. Drainage boundary laws of horizontal well with stimulated reservoir volume fracturing in tight oil reservoirs:A case study of Changqing Oilfield[J]. Petroleum Geology and Recovery Efficiency, 2016, 23(6):87-93.
[5]李向平,齐银,李转红,等.鄂尔多斯盆地安83区块致密油藏老井暂堵混合水体积压裂技术[J].油气地质与采收率,2016,23(6):120-126.LI Xiangping,QI Yin,LI Zhuanhong,et al. Temporary plugging and mixed water volume fracturing technology of tight oil reservoirs in An83 Block, Ordos Basin[J]. Petroleum Geology and Recovery Efficiency,2016,23(6):120-126.
[6]贾帅,崔伟香,杨江,等.新型超分子压裂液的流变性能研究及应用[J].油气地质与采收率,2016,23(5):83-87.JIA Shuai,CUI Weixiang,YANG Jiang,et al. Research on rheological properties of a new supramolecular fracturing fluid and its application[J]. Petroleum Geology and Recovery Efficiency,2016,23(5):83-87.
[7]王中泽,黄晶,曾昊,等.一种新型清洁压裂液体系的研究及应用[J].石油与天然气化工,2014,43(6):639-644.WANG Zhongze,HUANG Jing,ZEGN Hao,et al. Research and application of a new clean fracturing fluid system[J]. Chemical Engineering of Oil and Gas,2014,43(6):639-644.
[8]赵海洋,张士诚.高温清洁压裂液在塔河油田的应用[J].大庆石油地质与开发,2014,33(6):80-85.ZHAO Haiyang,ZHANG Shicheng. Application of the high-temperature clean rracturing fluid in Tahe Oilfield[J]. Petroleum Geology&Oilfield Development in Daqing, 2014, 33(6):80-85.
[9]张锋三,任婷,张军涛,等.一种磺酸型表面活性剂压裂液的研究及应用[J].石油钻采工艺,2015,37(6):94-97.ZHANG Fengsan,REN Ting,ZHANG Juntao,et al. Research and application of surfactant fracturing fluid of sulfonic acid type[J].Oil Drilling&Production Technology,2015,37(6):94-97.
[10]毛金成,张阳,李勇明,等.压裂返排液处理技术的研究进展[J].石油化工,2016,45(3):368-372.MAO Jincheng,ZHANG Yang,LI Yongming,et al. Progresses in research of treatment technology of fracturing flowback fluid[J].Petrochemical Technology,2016,45(3):368-372.
[11]严志虎,戴彩丽,赵明伟,等.压裂返排液处理技术研究与应用进展[J].油田化学,2015,32(3):444-448.YAN Zhihu,DAI Caili,ZHAO Mingwei,et al. Research and application progress on treatment technology of fracturing flowback fluid[J]. Oilfield Chemistry,2015,32(3):444-448.
[12]韩卓,郭威,张太亮,等.非常规压裂返排液回注处理实验研究[J].石油与天然气化工,2014,43(1):108-112.HAN Zhuo,GUO Wei,ZHANG Tailiang,et al. Experimental study on reinjection treatment of unconventional fracturing flowback fluid[J]. Chemical Engineering of Oil and Gas,2014,43(1):108-112.
[13]宋磊,张晓飞,王毅琳,等.美国页岩气压裂返排液处理技术进展及前景展望[J].环境工程学报, 2014, 8(11):4721-4725.SONG Lei,ZHANG Xiaofei,WANG Yilin,et al. Frac-back water treatment development and perspective in the United States[J].Chinese Journal of Environmental Engineering, 2014, 8(11):4721-4725.
[14]孟庆帮,刘慧卿,王敬.天然裂缝性油藏渗吸规律[J].断块油气田,2014,21(3):330-334.MENG Qingbang,LIU Huiqing,WANG Jing. Imbibition law of naturally fractured reservoirs[J]. Fault-Block Oil and Gas Field,2014,21(3):330-334.
[15]黄睿哲,姜振学,高之业,等.页岩储层组构特征对自发渗吸的影响[J].油气地质与采收率, 2017, 24(1):111-115.Huang Ruizhe,Jiang Zhenxue,Gao Zhiye,et al. Effect of composition and structural characteristics on spontaneous imbibition of shale reservoir[J]. Petroleum Geology and Recovery Efficiency,2017,24(1):111-115.
[16]濮御,王秀宇,濮玲.致密储层静态渗吸实验[J].大庆石油地质与开发,2016,35(6):159-163.PU Yu,WANG Xiuyu,PU Ling. Experiment of the static imbibition for tight reservoirs[J]. Petroleum Geology&Oilfield Development in Daqing,2016,35(6):159-163.
[17]许建红,马丽丽.低渗透裂缝性油藏自发渗吸渗流作用[J].油气地质与采收率,2015,22(3):111-114.XU Jianhong,MA Lili. Spontaneous imbibition in fractured low permeability reservoir[J]. Petroleum Geology and Recovery Efficiency,2015,22(3):111-114.
[18]谢坤,卢祥国,陈欣,等.高温低渗油藏中表面活性剂溶液渗吸效果影响因素研究[J].西安石油大学学报(自然科学版),2015,30(5):80-84.XIE Kun,LU Xiangguo,CHEN Xin,et al. Study on influence factors of imbibition effect of surfactant in high temperature and low permeability reservoir[J]. Journal of Xi'an Shiyou University(Natural Science),2015,30(5):80-84.
[19]李洪,李治平,王香增,等.表面活性剂对低渗透油藏渗吸敏感因素的影响[J].石油钻探技术, 2016, 44(5):100-103.LI Hong,LI Zhiping,WANG Xiangzeng,et al. The effect of surfactants on imbibition-sensitive factors of low-permeability reservoirs[J]. Petroleum Drilling Techniques,2016,44(5):100-103.
[20]沈安琪,刘义坤,邱晓惠,等.表面活性剂提高致密油藏渗吸采收率研究[J].油田化学,2016,33(4):696-699.SHEN Anqi,LIU Yikun,QIU Xiaohui,et al. Improvement of spontaneous imbibition oil recovery in tight oil reservoir by surfactants[J]. Oilfield Chemistry,2016,33(4):696-699.
[21]陈明贵,杨光,王登科,等.砂岩油藏双子表面活性剂渗吸配方研究[J].油田化学,2014,31(3):400-404.CHEN Minggui,YANG Guang,WANG Dengke,et al. Formula study of gemini surfactant imbibition for sandstone reservoir[J].Oilfield Chemistry,2014,31(3):400-404.
[22]高遵美.浅层油气藏清洁压裂液破胶方法与再利用研究[D].青岛:中国石油大学(华东),2014.GAO Zunmei. Study on gel breaking method and reusing of clear fracturing fluid in shallow oil and gas reservoirs[D]. Qingdao:China University of Petroleum(East China),2014.
[23] SCHECTER D S,ZHOU Dengen,ORR F M. Low IFT drainage and imbition[J]. Journal of Petroleum Science&Engineering,1994,11(4):283-300.
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