文章摘要
丁彬1,2,罗健辉1,2,耿向飞1,2,贾辰1,2,贺丽鹏1,2,王平美1,2,彭宝亮1,2
Study on new visual evaluation method for fluids in cores based on low field nuclear magnetic resonance technology
投稿时间:2017-11-22  修订日期:2017-11-22
DOI:
中文关键词: 低场核磁  横向弛豫时间  孔隙分布
英文关键词: low field nuclear magnetic resonance  spin-spin relaxtion time  pore distribution  
基金项目:
作者单位E-mail
丁彬 1. 中国石油勘探开发研究院 2. 中国石油天然气股份有限公司纳米化学重点实验室 dingb@petrochina.com.cn 
罗健辉 1. 中国石油勘探开发研究院 2. 中国石油天然气股份有限公司纳米化学重点实验室  
耿向飞 1. 中国石油勘探开发研究院 2. 中国石油天然气股份有限公司纳米化学重点实验室  
贾辰 1. 中国石油勘探开发研究院 2. 中国石油天然气股份有限公司纳米化学重点实验室  
贺丽鹏 1. 中国石油勘探开发研究院 2. 中国石油天然气股份有限公司纳米化学重点实验室  
王平美 1. 中国石油勘探开发研究院 2. 中国石油天然气股份有限公司纳米化学重点实验室  
彭宝亮 1. 中国石油勘探开发研究院 2. 中国石油天然气股份有限公司纳米化学重点实验室  
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中文摘要:
      岩心等多孔介质中流体的流动状态在线监测与“可视化”评价已成为驱油与扩大波及体积微观机理研究的重要实验新方法。本文将低场核磁共振与岩心驱替装置联用,基于核磁共振原理,得到了岩心横向驰豫时间(T2)分布关系,结合压汞孔隙半径分布测试结果,采用插值与最小二乘法,建立了饱和水后的岩心核磁共振T2谱与孔隙分布关系。以实验选用的中高渗(256 mD)和低渗透(7.51 mD)两种岩心为例,结合不同流体的岩心驱替实验,利用转化的核磁孔喉分布得到了岩心孔隙结构、可动流体、可动油及残余油,解析了水驱、聚驱对不同孔隙的原油动用率。实验结果表明:中高渗岩心平均孔隙直径为72 μm,主要集中在1μm-500μm之间,微米级孔隙较发育;低渗岩心平均孔隙直径为86 nm,主要集中在10 nm-1μm之间,纳米-亚微米级孔隙发育。两块岩心驱替实验结果显示:水驱主要动用孔隙直径大于10 μm的储油空间,聚合物驱原油动用区域与水驱基本一致,提高驱替效果有限,残余油80%以上富集在孔隙直径小于1 μm孔隙内,改善低渗透区域水驱效果必将是未来提高采收率技术关键。
英文摘要:
      The online monitoring of fluids flowing status in cores and visual evaluation have become important experiment method for oil displacing and enlarge sweep volume mechanism. In this paper, low field nuclear magnetic resonance and core flooding equipment were combined, based on nuclear magnetic resonance theory, distribution of spin-spin relaxtion time (T2) were obtained. Combined with mercury injection pore radius analysis results, using interpolation and least square method, the relationship between nuclear magnetic resonance T2 spectrogram and pore radius of core was established. Take medium-high permeability(256 mD) and low permeability(7.51 mD) cores for example, binding with core flooding experiments of different fluids, using conversed nuclear magnetic pore throat distribution, we obtained pore structure of core, movable fluids, movable oil and residual oil. We also analyzed the oil exploiting rate in different pore by water flooding and polymer flooding. The results showed that: the average pore diameter of medium-high permeability core was 72μm, the pores was mainly between 1μm-500μm, micro-level pore developed well. The average pore diameter of low permeability core was 86 nm, the pores was mainly between 10 nm-1μm, nano and sub-micro-level pore developed well. The core flooding experiments results showed that: oil in pores larger than 10μm was displaced by water, and polymer showed the same tendency, oil flooding efficiency was limited. More than 80% of the residual oil was in the pores smaller than 1μm. So, improving the water flooding efficiency of low permeability zone is the key point for EOR in the future.
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