阴阳离子聚合物吸附规律的研究与应用*

Study and Application of the Adsorption of Anionic and Cationic Polymer

赵 光 方吉超 高 波 王 毅 陈 昂 温栋良 戴彩丽

ZHAO Guang FANG Ji-Chao GAO Bo WANG Yi CHEN Ang WEN Dong-Liang DAI Cai-Li

阴阳离子聚合物在地层中的吸附性能是评价其堵水效果的主要指标，因此通过室内实验研究了阴阳离子聚合物的静态、动态吸附规律。结果表明：阴离子聚合物的吸附平衡时间为6 h，吸附平衡质量浓度为1000 mg/L；阳离子聚合物的吸附平衡时间为8 h，吸附平衡浓度为1500 mg/L；温度对阴阳离子聚合物吸附量的影响较小，阴阳离子聚合物在水湿岩心的吸附量远大于其在油湿岩心的吸附量。单一注入阴离子聚合物、交替注入阴/阳离子聚合物、单一注入阳离子聚合物和交替注入阳/阴离子聚合物的动态吸附量分别为61.77、103.99、119.64和137.61 mg/g。阴阳离子聚合物可在岩心形成多层吸附膜，交替注入阳/阴离子聚合物可提高采收率达60%。2010年在河南油田双浅6井开展矿场实验，共注入阳/阴离子聚合物3个轮次，降水增油效果较好，达到温和控水的目的。图9表1参11

The adsorption capacity of anionic and cationic polymer was a mainly indicator for investigation of water shut-off capacity, so the static and dynamic adsorption capacity were investigated. The experiment results showed that the adsorption equilibrium mass concentration of anionic and cationic polymer was 1000 and 1500 mg/L, and the adsorption equilibrium time of that was about 6 and 8 hrs. Temperature had a slight influence on the adsorption of anionic and cationic polymer. However, the adsorption increased with increasing hydrophilicity of core, and the adsorption capacity on hydrophilic core was much larger than that on lipophilic core. The dynamic adsorption quantity of anionic polymer with single injection, anionic polymer and cationic polymer with alternative injection, cationic polymer with single injection, and cationic polymer and anionic polymer with alternative injection was 61.77, 103.99, 119.64 and 137.61 mg/g, respectively. The alternative injection polymer could form a multilayer on the core which could effectively plug the big channels. The visual simulation result showed that the oil recovery of water flooding reached 60% after alternative injection of cationic and anionic polymers. Field application in Shuangqian 6 well of Henan oilfield showed that the profile was effectively improved, the water cut obviously decreased and the oil increased after alternative injection of three round polymers in 2010.