油田用聚合物纳米微球调剖驱油机理研究,Energy & Fuels

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油田用聚合物纳米微球调剖驱油机理研究
Energy & Fuels ( IF 5.2 ) Pub Date : 2023-02-06 , DOI: 10.1021/acs.energyfuels.2c03301
Fumin Zhang ₁ , Baofeng Hou _{1,

2,

3} , Song Wang ₁ , Hao Chen ₁ , Jinbao Yang ₁ , Haiming Fan ₂ , Lin Gui ₄

Affiliation

本研究利用环境扫描电子显微镜（ESEM）、溶胀水化实验、填砂管驱替实验和微观驱替实验研究了聚合物纳米微球（HQ）的迁移/堵塞机理和主要性能。结果表明，随着溶胀时间的增加，HQ在盐溶液中的溶胀率先增大后达到平衡。HQ的膨胀率在膨胀初期迅速增加，膨胀7天后达到最大值。膨胀比的最大值为15。此外，盐度越高，所研究微球的粒径越小。微球的粒径随着温度的升高而增加。根据可视化显微实验，发现了微球在孔喉中的运移和堵塞机理。当粒径为孔喉直径的 1/3~1/7 倍时，微球颗粒可以进入孔隙内部。微球聚集在一起，由于孔喉的机械圈闭而发生桥塞。在这种情况下，孔喉被产生的内部滤饼堵塞。驱替实验过程中各点压力呈锯齿形上下波动，揭示了HQ的“迁移-堵塞-突破-再堵塞”机制。从驱油实验可以看出，最终累计采收率和提高采收率分别为65.71%和17.31%。因此，所研究的纳米微球具有优异的驱油性能。

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Study on the Profile Control and Oil Displacement Mechanism of a Polymer Nano-microsphere for Oilfield

In this study, the mechanism of migration/plugging and the main performance of polymer nano-microspheres (HQ) were investigated using environmental scanning electron microscopy (ESEM), swelling hydration experiments, sand-filling pipe flooding experiments, and microscopic displacement experiments. Results show that the swelling ratio of HQ in salt solution first increases and then reaches equilibrium with the increase in swelling time. The expansion ratio of HQ increases rapidly at the initial stage of swelling and reaches its maximum value after swelling for 7 days. The maximum value of the expansion ratio was 15. In addition, the higher the salinity, the smaller the particle size of the studied microspheres. The particle size of the microspheres increases with increasing temperature. According to the visualized microscopic experiments, the migration and blocking mechanism of microspheres in the pore throat were discovered. When the particle size is 1/3–1/7 times the pore throat diameter, the microsphere particles can enter the interior of the pores. The microspheres aggregate together, and bridge plugging occurs due to the mechanical trapping of pore throats. In this case, the pore throats are blocked by the produced inner filter cake. The pressure at each point fluctuates up and down in a zigzag pattern during the displacement experiment, revealing the “migrated-plugged-breakthrough-replugged” mechanism for HQ. It can be seen from the oil displacement experiment that the final cumulative recovery and the enhanced oil recovery were 65.71 and 17.31%, respectively. Thus, the studied nano-microspheres have excellent oil displacement performance.

更新日期：2023-02-06

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