测定聚合物或交联聚合物不可及孔隙体积新方法

发布时间：2018-02-26 03:09

本文关键词： 部分水解聚丙烯酰胺交联聚合物渗透率不可及孔隙体积不可及孔隙极限半径　出处：《油田化学》2017年02期 　论文类型：期刊论文

【摘要】：聚合物不可及孔隙体积(IPV)对聚合物驱波及系数的影响较大,为了尽可能从配方优选的角度减弱这一参数的负面影响,建立了一种测试IPV的新方法。该方法采用淀粉-碘化镉法测量通过岩心孔隙的聚合物浓度,结合质量守恒公式,直接计算聚合物对于岩心的IPV,并借助压汞数据所得的岩心孔隙半径与频率分布关系,推算出不可及孔隙极限半径。用该方法计算了部分水解聚丙烯酰胺和交联聚合物溶液的IPV与不可及孔隙极限半径,研究了岩心渗透率和交联剂浓度对这两个参数的影响。实验结果表明,随着岩心渗透率下降,聚合物溶液IPV逐渐增大;岩心渗透率相近时,交联剂浓度越高,不可及孔隙体积百分比越大。在渗透率较高的岩心中,交联聚合物的不可及孔隙极限半径随交联剂浓度增加而增大;在渗透率较低的岩心中,交联剂浓度对聚合物溶液的不可及孔隙极限半径几乎没有影响。该方法具有操作简便、结果可靠的特点,可以通过采集得到的露头岩心测量任意油层的IPV和不可及孔隙极限半径,并对聚合物或交联聚合物的配方优选提供数据支持。
[Abstract]:Polymer inaccessible pore volume (IPV) has a great influence on the sweep coefficient of polymer flooding. In order to reduce the negative effect of this parameter from the angle of formula optimization as far as possible, A new method for measuring IPV is established. The method uses starch cadmium iodide method to measure the concentration of polymer through core pores and combines the mass conservation formula. The IPV of polymer to core is calculated directly, and the relationship between pore radius and frequency distribution of core is obtained by mercury injection data. The limit radius of inaccessible pore is calculated by this method. The IPV and the limit radius of inaccessible pore of partially hydrolyzed polyacrylamide and crosslinked polymer solution are calculated by this method. The effects of core permeability and crosslinking agent concentration on these two parameters are studied. The experimental results show that the IPV of polymer solution increases with the decrease of core permeability, and the higher the crosslinking agent concentration is when the core permeability is close. The larger the percentage of unreachable pore volume is, the larger the limit radius of unreachable porosity of cross-linked polymer increases with the increase of the concentration of crosslinking agent in the core with higher permeability; in the core with low permeability, The concentration of crosslinking agent has little effect on the limit radius of inaccessible pore of polymer solution. The obtained outcrop cores can be used to measure the IPV and unreachable pore limit radius of any reservoir and to provide data support for the optimum selection of polymer or crosslinked polymer formulations.
【作者单位】：中国石油大学(北京)提高采收率研究院;中国石油天然气集团公司三次采油重点实验室低渗油田提高采收率应用基础理论研究室;教育部油田开发重点实验室(中国石油大学(北京));
【基金】：国家重大专项“油田开采后期提高采收率技术”(项目编号2011ZX05009-004)
【分类号】：TE357.46

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