聚合物微球在人造砾岩岩心中的运移性能

Propagation of polymer microgels in laboratory artificial conglomerate coreflooding

聚合物微球是一种可改善油藏非均质性、提高水驱采收率的深部调剖剂。采用多点测压人造砾岩岩心实验和产出液中微球粒度分布测试相结合的方法,研究了粒度分布呈双峰的聚合物微球体系在2种渗透率的人造砾岩岩心中的运移性能。研究结果表明,聚合物微球在渗透率为0.295 7和0.634 5μm2的人造砾岩岩心中具有较好的注入性能,且最大阻力系数分别为5.3和8.5;粒度超过16μm的聚合物微球难以通过渗透率为0.295 7μm2的人造砾岩岩心,其产出液中微球粒度呈单峰分布特征,峰值为5μm;而渗透率为0.634 5μm2的人造砾岩岩心产出液中微球粒度呈双峰分布特征,峰值分别为7和150μm,粒度超过450μm的聚合物微球难以通过。

The polymer microgels are a kind of agents, which has a role of improving reservoir heterogeneity and enhancing oil recov-ery. This new laboratory studies reported in this paper aimed at knowing how the polymer microgels propagate in porous media by artifi-cial conglomerate cores experiments with multiple pressure measurement and the size distribution of microgels in yielding fluid. The re-sults show that the maximum resistance factors are 5.3 and 8.5 respectively, while the polymer microgels propagate within the artificialconglomerate cores. There is only single peak, in which the highest peak is 5 μm in the yielding fluid of the core with permeability of0.295 7 μm2. Furthermore, the double peaks appeared, in which the highest peaks are 7 and 150 μm respectively in the yielding fluidfrom the core with permeability of 0. 634 5 μm2. It is a good way on how to choose the size of polymer microgels in the field applicationof polymer microgels flooding.