岩心尺度对三元复合体系渗流特性的影响

Effect of Core Size on the Seepage Characteristic of Alkali/Surfactant/Polymer System

杨红 余华贵 黄春霞 李鹏宇 朱庆祝 王维波

YANG Hong YU Huagui HUANG Chunxia LI Pengyu ZHU Qingzhu WANGWeibo

针对室内岩心尺度的局限性造成岩心中注入的三元复合体系无法完全真实地模拟其在实际油藏中渗流特性的问题，采用长度分别为30、100 和240 cm的填砂管开展了三元复合体系渗流实验，研究了岩心长度对三元复合体系在渗流过程中发生的色谱分离规律和体系中各组分滞留损失的影响，分析了复合体系渗流前缘浓度和黏 度的沿程变化。结果表明：岩心长度对三元复合体系在渗流过程中发生的色谱分离现象影响明显，各组分产出时间的先后顺序依次为聚合物、碱、表面活性剂，稳浓时间先后顺序依次为碱、聚合物、表面活性剂。与填砂管长度为30 cm时相比，填砂管长度为240 cm时复合体系中碱、表面活性剂和聚合物的产出时间均滞后约0.3 PV，碱和聚合物的稳浓时间分别滞后约0.2 PV和0.4 PV，而表面活性剂的稳浓时间提前约0.5 PV；填砂管长度由30 cm增至240 cm 时，碱和表面活性剂在填砂管中的滞留损失率变化较小，聚合物的滞留损失率由23.29%增至55.74%；随着复合体系渗流前缘向前延伸，渗流前缘上游区域浓度（黏度）升高并逐渐达到饱和，前缘浓度（黏度）逐渐降低，渗流前缘上游区域同一位置处各组分相对浓度大小顺序为：碱>表面活性剂>聚合物。图8 表2参16

The seepage characteristic of alkaline/surfactant/polymer（ASP）system in actual reservoir couldn’t be simulated through cores because of its limited length. To solve the problem，ASP seepage experiment in sand-filled pipes with the length of 30，100 and 240 cm was carried out. The effect of core length on chromatographic separation and damage for detention of ASP system was studied，and the concentration and viscosity change of every component in seepage front was analyzed. Experiment results showed that the effect of core length on chromatographic separation of ASP system during seepage press was obvious. Three components were arranged according to their production time in following order: polymer，alkali and surfactant，and according to the concentration stabilization time in following order: alkaili，polymer and surfactant. When core length increased from 30 to 240 cm， the production time of three components was postponed about 0.3 PV. Meanwhile，the concentration stabilization time of alkali and polymer was postponed 0.2 PV and 0.4 PV approximately，while that of surfactant was 0.5 PV in advance. The effect of core length on the retention loss rate of alkali and surfactant was little，but the retention loss rate of polymer increased from 23.29% to 55.74% with core length growing from 30 to 240 cm. With the ASP system seepage front extending forward，the concentration and viscosity of upstream region increased and became stable，while that of seepage front reduced. Three components were arranged according to their relative concentration on the same station in upstream region in following order: alkali，surfactant and polymer.

10.19346/j.cnki.1000-4092.2016.04.028