An Experimental Study on the Effect of Microscopic Pore Structure on Spontaneous Imbibition in Tight Sandstones
-
摘要: 目前对于渗吸的研究多集中于润湿性和界面张力，微观孔隙结构作为影响自发渗吸的主要因素之一常被忽略。利用核磁共振技术对致密砂岩渗吸过程中的油水分布变化进行了研究，同时采用恒速压汞、氮气吸附、高压压汞等试验手段求取了平均孔喉比、比表面、孔隙尺寸等表征微观孔隙特征的参数，并在此基础上分析研究了微观孔隙结构对渗吸的影响。试验结果表明：在致密砂岩渗吸过程中，中等尺寸的孔隙采出程度最大；孔隙度与渗吸采收率相关性不大，而渗透率越大，储层品质越好，渗吸采收率越高；平均孔喉比和比表面均与渗吸采收率负相关，比表面越大，中小喉道分布越多，孔喉比越大，越不利于渗吸流体的吸入和非润湿相的排出；中等孔隙比例越大，渗吸采收率越高，而由于黏滞力的作用部分小孔隙无法进行有效的渗吸，小孔隙比例增大对于渗吸采收率的提高不利。因此，储渗性能较好、中等孔隙占比较高的致密砂岩储层更适宜采用渗吸采油。Abstract: Experimental studies of spontaneous imbibition mostly focus on wettability and interfacial tension, while the microscopic pore structure as one of the primary factors affecting spontaneous imbibition is usually neglected. Nuclear magnetic resonance (NMR) technology was used to investigate the change of oil and water distribution in tight sandstone during spontaneous imbibition; in addition, constant-speed mercury injection, high pressure mercury injection, nitrogen adsorption and other test methods were adopted to obtain characteristic parameters of microscopic pore such as average pore throat ratio, specific surface area and pore size. On this basis, the effect of microscopic pore structure on spontaneous imbibition was analyzed and studied. Experimental results showed that medium pores achieved the highest recovery rate in the process of spontaneous imbibition; the porosity was correlated less with the imbibition recovery rate while the imbibition recovery rate was proportional to the permeability and reservoir quality; the average pore throat ratio and specific surface area were negatively correlated with the imbibition recovery rate, medium and large throats increased with the specific surface area and the higher pore throat ratio was more adverse to absorption of imbibition fluids and non-wetting phase discharge; the imbibition recovery rate was proportional to the medium pore ratio and the small pore ratio increase was adverse to the improvement of the imbibition recovery rate, because some small pores could not achieve effective imbibition under viscous forces. Therefore, tight sandstones with the highest reservoir permeability and medium pore ratio were more suitable for imbibition oil recovery.
-
-
[1] 林森虎,邹才能,袁选俊,等.美国致密油开发现状及启示[J].岩性油气藏,2011,23(4):25-30,64. LIN Senhu,ZOU Caineng,YUAN Xuanjun,et al.Status quo of tight oil exploitation in the United States and its implication[J].Lithologic Reservoirs,2011,23(4):25-30,64. [2] 陈淦,宋志理.火烧山油田基质岩块渗吸特征[J].新疆石油地质,1994,15(3):268-275. CHEN Gan,SONG Zhili.Imbibition characteristics of rock matrix in Huoshaoshan Oilfield[J].Xinjiang Petroleum Geology,1994,15(3):268-275. [3] 杨正明,朱维耀,陈权,等.低渗透裂缝性砂岩油藏渗吸机理及其数学模型[J].江汉石油学院学报,2001,23(增刊1):25-27. YANG Zhengming,ZHU Weiyao,CHEN Quan,et al.Imbibition mechanism of low permeability fractured sandstone reservoir and its mathematical model[J].Journal of Jianghan Petroleum Institute,2001,23(supplement 1):25-27. [4] 朱维耀,鞠岩,赵明,等.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,JU Yan,ZHAO Ming,et al.Spontaneous imbibition mechanism of flow through porous media and waterflooding in low-permeability fractured sandstone reservoir[J].Acta Petrolei Sinica,2002,23(6):56-59. [5] 王锐,岳湘安,李贻勇,等.不同尺度条件下的渗吸实验研究[J].大庆石油地质与开发,2012,31(2):112-115. WANG Rui,YUE Xiang’an,LI Yiyong,et al.Experimental studies on the imbibition under the conditions of different scales[J].Petroleum Geology Oilfield Development in Daqing,2012,31(2):112-115. [6] 杨正明.低渗透油藏渗流机理及其应用[D].北京:中国科学院渗流流体力学研究所,2004. YANG Zhengming.Porous flow mechanics for low permeability reservoirs and its application[D].Beijing:Chinese Academy of Science,Institute of Porous Flow and Fluid Mechanics,2004. [7] 程晓倩,刘华勋,熊伟,等.新疆低渗透砂砾岩油藏自发渗吸实验研究[J].科学技术与工程,2013,13(26):7793-7797. CHENG Xiaoqian,LIU Huaxun,XIONG Wei,et al.Experimental research of spontaneous imbibition in low-permeability glutenite reservoir[J].Science Technology and Engineering,2013,13(26):7793-7797. [8] 张星.低渗透砂岩油藏渗吸规律研究[M].北京:中国石化出版社,2013:23-55. ZHANG Xing.Low permeability standstone reservoir imbibition law research[M].Beijing:China Petrochemical Press,2013:23-55. [9] LUCAS R.Rate of capillary ascension of liquids[J].Kolloid Zeitschrift,1918,23(15):15-22.
[10] WASHBURN E W.Dynamics of capillary flow[J].Physical Review,1921,17(3):273-283.
[11] CAI J C,YU B M,ZOU M Q,et al.Capillary rise in a single tortuous capillary[J].Chinese Physics Letter,2010,27(5):148-151.
[12] 蔡建超,赵春明,谭吕,等.低渗储层多孔介质渗吸系数的分形分析[J].地质科技情报,2011,30(5):54-59. CAI Jianchao,ZHAO Chunming,TAN Lyu,et al.Fractal analysis on imbibition coefficient in porous media of low permeability reservoir[J].Geological Science and Technology Information,2011,30(5):54-59. [13] 蔡建超,郭士礼,游利军,等.裂缝-孔隙型双重介质油藏渗吸机理的分形分析[J].物理学报,2013,62(1):220-224. CAI Jianchao,GUO Shili,YOU Lijun,et al.Fractal analysis of spontaneous imbibition mechanism in fractured-porous dual media reservoir[J].Acta Physica Sinica,2013,62(1):220-224. [14] TREIBER L E.OWENS W W.A laboratory evaluation of the wettability of fifty oil-producing reservoirs[J].Society of Petroleum Engineers Journal,1972,12(6):531-540.
[15] KEIJZER P P M,de VRIES A S.Imbibition of surfactant solutions[J].SPE Advanced Technology,1993 (2):110-113.
[16] 裴柏林,彭克宗,黄爱斌.一种吸渗曲线测定新方法[J].西南石油学院学报,1994,16(4):46-50. PEI Bailin,PENG Kezhong,HUANG Aibin.A new method of measuring imbibition curves[J].Journal of Southwestern Petroleum Institute,1994,16(4):46-50. [17] CUIEC L E,BOURBIAUX B J,KALAYDJIAN F.Oil recovery by imbibition in low-permeability chalk[J].SPE Formation Evaluation,1994,9(3):200-208.
[18] ZHOU Xianmin,MORROW N R,MA Shouxiang.Interrelationship of wettability,initial water saturation,aging time,and oil recovery by spontaneous imbibition and water flooding[J].Society of Petroleum Engineers Journal,2000,5(2):199-207.
[19] AUSTAD T,STANDNES D C.Spontaneous imbibition of water into oil-wet carbonates[J].Journal of Petroleum Science and Engineering,2003,39(3):363-376.
[20] STOLL M,HOFMAN J,LIGTHEIM D J,et al.Toward field-scale wettability modification:the limitation of diffusive transport[J].SPE Reservoir Evaluation Engineering,2008,11(3):633-640.
[21] 李士奎,刘卫东,张海琴,等.低渗透油藏自发渗吸驱油实验研究[J].石油学报,2007,28(2):109-112. LI Shikui,LIU Weidong,ZHANG Haiqin,et al.Experimental study of spontaneous imbibition in low-permeability reservoir[J].Acta Petrolei Sinica,2007,28(2):109-112. [22] 王锐,吕成远,岳湘安,等.碳酸水对岩石润湿性及渗吸采收率的影响实验[J].西安石油大学学报(自然科学版),2010,25(2):48-50. WANG Rui,LYU Chengyuan,YUE Xiang’an,et al.Experimental study on the effects of carbonate water on rock wettability and imbibition recovery[J].Journal of Xi’an Shiyou University(Natural Science Edition),2010,25(2):48-50. [23] 李爱芬,凡田友,赵琳.裂缝性油藏低渗透岩心自发渗吸实验研究[J].油气地质与采收率,2011,18(5):67-69,77. LI Aifen,FAN Tianyou,ZHAO Lin.Experimental study of spontaneous imbibition in low permeability core,fractured reservoir[J].Petroleum Geology and Recovery Efficiency,2011,18(5):67-69,77. [24] 张程恩,潘保芝,刘倩茹.储层品质因子RQI结合聚类算法进行储层分类评价研究[J].国外测井技术,2012(4):11-13. ZHANG Cheng’en,PAN Baozhi,LIU Qianru.Reservoir classification evaluation research with combination of reservoir quality factor RQI and clustering algorithm[J].World Well Logging Technology,2012(4):11-13. -
期刊类型引用(5)
1. 张佳佳，印兴耀，张广智，曹丹平，宗兆云. 岩石动静态弹性力学参数同步测量装置设计. 实验室研究与探索. 2023(03): 59-62+97 . 
百度学术
2. 孙源，荆文明，倪朋勃，沈文建. CA地区低渗砂岩动静态弹性模量转换关系研究. 海洋石油. 2022(02): 61-66 . 百度学术
3. 王英伟，王林生，覃建华，李晓山，高阳，王硕. 致密砾岩储层岩石力学参数及地应力测井评价方法研究. 测井技术. 2021(06): 624-629 . 百度学术
4. 王飞，边会媛，张永浩，段朝伟，赵伦，李建新. 不同温压下页岩动态与静态弹性模量转换研究. 石油与天然气地质. 2018(05): 1048-1055 . 百度学术
5. 崔莹，屈展，张永浩，王萍. 泥页岩动静态弹性力学参数实验研究. 广西大学学报(自然科学版). 2018(06): 2284-2291 . 百度学术
其他类型引用(6)
计量
- 文章访问数: 6529
- HTML全文浏览量: 111
- PDF下载量: 9604
- 被引次数: 11
下载:
