摘要: |
利用微孔滤膜模拟低渗透储层的喉道,将微孔滤膜过滤实验和激光粒度仪相结合,对纳微米聚合物颗粒分散体系在微孔滤膜过滤前后的粒径分布规律进行研究,并分析水化时间、注入压力、核孔膜尺寸、颗粒尺寸和颗粒浓度对粒径分布的影响。结果表明:保持其他条件为恒定值,存在一个最佳水化时间范围为大于240 h,在该水化时间范围内,聚合物颗粒弹性变形能力逐步增强,使得更大粒径的聚合物颗粒得以通过1.2 μm的喉道;增大注入压力,有助于更大粒径的聚合物颗粒通过1.2 μm的喉道;增大聚合物颗粒浓度,会增强聚合物颗粒在1.2 μm喉道处的封堵效果;不同尺寸分布的聚合物颗粒分散体系与一定大小的喉道相适应;聚合物颗粒粒径与喉道直径比值δ≥3.0的范围为聚合物颗粒直接封堵流动区域,1.0≤δ<3.0的范围为聚合物颗粒弹性流动区域,δ<1.0的范围为架桥封堵流动区域。 |
关键词: 低渗透储层 纳微米聚合物颗粒 微孔滤膜过滤法 流动机制 |
DOI:10.3969/j.issn.1673-5005.2015.06.024 |
分类号::TE 357.4 |
基金项目:国家自然科学基金项目(50934003,3);国家重点基础研究发展计划(2013CB228002);浙江海洋学院科研启动项目 |
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Flow mechanism of aqueous dispersion system of nano/ micron-sized polymer particles in low permeability reservoir |
LONG Yunqian1, ZHU Weiyao2, HAN Hongyan2, WANG Ming3, XU Yang4
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(1.Innovation Application Institute, Zhejiang Ocean University, Zhoushan 316022, China;2.School of Civil & Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China;3.Research Institute of Petroleum Exploration & Production, SINOPEC Zhongyuan Oilfield Company, Puyang 457001,China;4.China Petroleum Pipeline Engineering Corporation, Langfang 065000, China)
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Abstract: |
The distribution characteristics of nano/micron-sized polymer particles size before and after filtering with microporous membranes were studied by the laser particle size analyzer, which were used to simulate the throat of low permeability reservoir. The influences of hydration time, injection pressure, microporous membrane size, polymer particle size and concentration on distribution characteristics were also analyzed. The results show that there exists an optimal hydration time range with more than 240 h on the condition of fixing other parameters, during which the gradually increasing elastic deformation of polymer particles makes larger polymer particles to flow the 1.2 μm throat. It is also found that increasing injection pressure contributes to larger polymer particles flowing through the 1.2 μm throat. However increasing polymer particles concentration can enhance the plugging effect of polymer particles in the 1.2 μm throat. The different distributions of polymer particles size are appropriate to certain throat sizes. The range with more than or equal 3.0 of δ, which is the ratio of polymer particle size to throat diameter, is the region of polymer particles directly plugging, the range with more than or equal 1.0 and less than 3.0 of δ is the region of elastic flow, and the range with less than 1.0 of δ is the region of bridging plugging. |
Key words: low permeability reservoir nano/micron-sized polymer particles microporous membrane filtration method flow mechanism |