聚合物溶液对孔隙结构特征的影响

doi:10.11743/ogg20120318

摘要/Abstract

摘要：

通过水驱、聚合物驱及后续水驱实验,研究了不同相对分子质量、不同质量浓度聚合物溶液的阻力系数和残余阻力系数;通过常规压汞实验,研究了聚合物驱后岩心孔隙结构特征,对比分析了不同相对分子质量、不同质量浓度的聚合物溶液驱替对岩心孔隙结构特征的影响。结果表明,由于聚合物溶液在岩心孔隙中的吸附滞留,随聚合物溶液相对分子质量、质量浓度的增加,阻力系数和残余阻力系数增大,渗透率下降幅度越大;毛管压力曲线从左下方到右上方逐次排列,孔隙体积在大孔道处减少,而在下一级的小孔道处增加,岩心的平均孔隙半径、半径均值、歪度、结构系数、均质系数各参数降低,其结果对聚合物驱后进一步提高原油采收率的方法研究具有重大的指导意义。

关键词: 吸附, 滞留, 孔隙结构, 阻力系数, 聚合物驱, 提高采收率

Abstract:

Resistance coefficient & residual resistance factor of polymer solutions with different molecular weight and mass concentration were studied based on water flooding,polymer flooding and subsequent waterflooding tests.This paper also researched the pore structure characteristics of the cores after the polymer flooding by conventional mercury porosimetry,and analyzed the influences of polymer flooding with polymer solution of different molecular weight and mass concentration on pore structure of cores.The results show that the resistance coefficient and the residual resistance factor increase and the amplitude of permeability decline enlarges along with the increasing molecular weight and mass concentration of polymer solution.Capillary pressure curves were successively arranged from bottom left to top right,pore volume reduces at big pore throat but enlarge at smaller pore throat.The average pore radius & mean values,skewness,structure coefficient and uniformity coefficient show a decreasing trend.The above results have great significances for the research of post-polymer flooding EOR methods.

Key words: adsorption, retention, pore structure, resistance coefficient, polymer flooding, EOR

中图分类号:

TE357.4

李朝霞,夏惠芬. 聚合物溶液对孔隙结构特征的影响[J]. 石油与天然气地质, 2012, 33(3): 479-483. doi: 10.11743/ogg20120318 Li Zhaoxia,Xia Huifen. Effect of polymer solution on pore structure characteristics[J]. Oil & Gas Geology, 2012, 33(3): 479-483. doi: 10.11743/ogg20120318

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