SZ36-1油田缔合聚合物驱堵塞物形成机理分析

The stemming formation mechanism analysis for hydrophobically associating polymer flooding in SZ36-1 Oil Field

宋爱莉 孙林 朱洪庆 刘春祥 夏光 山金城

SONG Aili SUN Lin ZHU Hongqing LIU Chunxiang XIA Guang SHAN Jincheng

中海油能源发展股份有限公司钻采工程研究院，天津　300452 中海石油中国有限公司天津分公司，天津　300452

CNOOC Energy Technology & Services Oilfield Engineering Research Institute, Tianjin 300452, China

结合X射线多晶衍射法、扫描电镜/能谱法、红外光谱等分析方法，对SZ36-1油田注聚井的储层堵塞物进行分析，研究了堵塞物的形成机理及微观形态。结果表明，堵塞物最为常见的是软硬结合的复合垢，形成机理主要是：在结垢趋势明显的SZ36-1油田地层条件下，高分子聚合物吸附、滞留在无机物核的周围，形成胶状的有机物、无机物相互缠绕包裹的复合垢；其次是地层中高价金属离子使聚合物分子发生交联，形成团状物堵塞储层；另外在多孔介质中疏水缔合聚合物由于缔合作用形成超分子聚合体结构，黏度增加的同时虽建立了较高的流动阻力，但也降低了储层渗透率。研究结果可为解堵工作液体系研究提供依据。

Reservoir stemming in polymer-injection wells in SZ36-1oil field was analyzed by applying x-ray polycrystalline diffraction, scanning electron microscopy/spectroscopy, infrared spectroscopy and so on, and the stemming formation mechanism and its micro morphology were studied. The results show that the most common blockage is soft-hard combination complex scale, and the main mechanism is: under the formation conditions in SZ36-1 oil field with clearly scaling tendency, the high molecular polymer adsorb and wind around a core of inorganic to form complex scale winded by the colloidal organic and inorganic matters; and following, the polymer molecules cross-link in response to the high valence metal ions in the formation to form lumpy reservoir stemming; besides, the hydrophobic associating polymers in the porous media form the super molecule polymer structure by association reaction, increasing the viscosity, establishing a high flow resistance and reducing the reservoir permeability.