渤海SZ 36-1油田注聚井聚合物吸附规律

Adsorption Law of Polymer in Injection Well of Bohai SZ 36-1 Oilfield

符扬洋 邹 剑 张 璐 刘义刚 郭布民 袁 征 杨红斌

FU Yangyang ZOU Jian ZHANG Lu LIU Yigang GUO Bumin YUAN Zheng YANG Hongbin

聚合物在地层孔隙中的吸附滞留会导致岩心渗透率下降甚至出现堵塞，本文针对渤海SZ 36-1油田聚合物驱井用的疏水缔合聚合物AP-P4，利用紫外分光光度计，在建立了聚合物溶液吸光度标准曲线基础上，探究了聚合物浓度、砂砾粒径、剂砂比以及温度对其静态吸附的影响规律；通过测试岩心损害率得到聚合物动态滞留规律。研究结果表明，疏水缔合聚合物AP-P4的静态吸附量随注入聚合物浓度的增加，砂砾粒径的减小及剂砂比的增大而增大，随温度的升高，吸附量逐渐减少；岩心损害率随岩心渗透率的减小而增大，随聚合物浓度的增大而增大，渗透率为161×10-3 μm2的岩心经2000 mg/L的AP-P4溶液驱后损害率高达99.58%，说明疏水缔合聚合物AP-P4在岩心内发生了严重的吸附滞留，造成岩心渗透率明显下降。图7表4参15

Adsorption retention of the polymer in the pores of the formation can lead to a decrease of the core permeability or even blockage. For the hydrophobic association polymer（AP-P4）used in the polychlorination well of Bohai SZ 36-1 oilfield，the basis of the absorbance standard curve of polymer solution was established by using ultraviolet spectrophotometer，and the effects of polymer concentration，grain size of gravel，agent sand ratio and temperature on static adsorption were investigated. By testing the core damage rate，the dynamic retention law of core permeability and polymer concentration was obtained. The results showed that the static adsorption amount of hydrophobically associating polymer increased with the increase of the concentration of injected polymer，the decline of the grain size of gravel and the increase of ratio of solution to sand. With the increase of temperature，the adsorption amount decreased gradually. The core damage rate increased with the decrease of core permeability and the increase of the polymer concentration. The damage rate of the core with permeability of 161×10-3 μm2 after flooding with 2000 mg/L AP-P4 solution was as high as 99.58%，which indicated that the hydrophobic associating polymer AP-P4 had serious adsorption retention in the core and resulted in the obvious decline of the core permeability.

10.19346/j.cnki.1000-4092.2019.04.020