基于核磁共振技术的压裂液防膨剂防膨效果评价  

Evaluation of the anti-swelling effect of the fracturing-fluid anti-swelling agent based on nuclear magnetic resonance technique

作　　者：徐润滋 齐银[3,4] 余兴国[3,4] 王雅楠 王泫懿 XU Runzi;QI Yin;YU Xingguo;WANG Ya’nan;WANG Xuanyi(School of Petroleum Engineering,Xi’an Shiyou University,Xi’an 710065,China;MOE Engineering Research Center of Development and Management for Low to Extra-Low Permeability Oil&Gas Reservoirs in West China,Xi’an Shiyou University,Xi’an 710065,China;Oil and Gas Technology Institute of PetroChina Changqing Oilfield Company,Xi’an 710018,China;National Engineering Laboratory for Exploration and Development of Low-Permeability Oil&Gas Fields,Xi’an 710018,China;Science and Technology Department of Xi’an Shiyou University,Xi’an 710065,China)

机构地区：[1]西安石油大学石油工程学院,陕西西安710065 [2]西安石油大学西部低渗-特低渗油藏开发与治理教育部工程研究中心,陕西西安710065 [3]中国石油长庆油田分公司油气工艺研究院,陕西西安710018 [4]低渗透油气田勘探开发国家工程实验室,陕西西安710018 [5]西安石油大学科技处,陕西西安710065

出　　处：《大庆石油地质与开发》2020年第2期80-85,共6页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家自然科学基金项目“非常规致密砂岩油藏超临界CO 2驱CO 2-原油-微纳米级孔喉缝系统的相互作用机理研究”(51774236);中国石油科技创新基金项目“致密砂岩储层有效孔喉缝系统与致密油赋存评价新方法研究”(2017D-5007-0104);西安石油大学研究生创新与实践能力培养项目“压裂液在双重介质致密砂岩油藏中的渗吸机理研究”(YCS18112011)。

摘　　要：为明确压裂液防膨剂对致密砂岩油藏不同尺度孔喉的防膨效果,从微观孔隙结构出发,以鄂尔多斯盆地天然岩心为研究对象,利用核磁共振技术,结合岩心驱替流动实验,定量评价防膨剂质量分数对不同尺度孔喉防膨效果的影响。结果表明:防膨剂质量分数为0.5%时,压裂液防膨剂的防膨效果达到最好,防膨剂在较大孔喉内的防膨效果优于较小孔喉,防膨作用尺度为0.75~537.23 ms,对0.01~0.75 ms尺度下的孔喉空间防膨作用微弱;压裂液防膨剂的质量分数与孔隙度伤害率、渗透率伤害率具有一定的负相关性,与防膨剂的作用范围无明显相关性,压裂液防膨剂的防膨效果与孔喉孔径具有相关性,在较大孔径中的防膨效果较好。研究成果可为压裂液防膨剂在致密砂岩储层中的应用提供理论支撑。For the purpose of clarifying the anti-swelling effect of fracturing-fluid anti-swelling agent on the pore throats of tight sandstone oil reservoirs,from the aspect of the micro-porosity structure,taking the natural core of Ordos Basin as the study object,with the help of nuclear magnetic resonance technique,combined with the core displacing experiment,the quantitative evaluation of the effect of the mass fraction of the anti-swelling agent on various-scale pore throat was conducted.The results show when the mass fraction of the anti-swelling agent is 0.5%,the anti-swelling effect of the fracturing-fluid anti-swelling agent is the best,the anti-swelling effect of the larger pore throat is better than that of the smaller one,the anti-swelling scales are from 0.75 ms to 537.23 ms,and the anti-swelling effect for the pore throat space at 0.01-0.75 ms is weakened;there exit a certain negative correlation between the mass fraction of the fracturing-fluid anti-swelling agent and the poroperm damage rates,while there is no obvious relationship with the affecting scope of the anti-swelling agent,and moreover there exit correlations with the anti-swelling effect of the fracturing-fluid anti-swelling agent and the pore-throat diameter,the anti-swelling effect in the larger pore diameter is much better.The study results can provide the theoretical support for the application of the fracturing-fluid anti-swelling agent in the tight sandstone reservoir.

关 键 词：防膨剂 黏土膨胀 黏土矿物 核磁共振 致密砂岩油藏 

分 类 号：TE357[石油与天然气工程—油气田开发工程]