低疏水单体含量缔合聚合物溶液驱油特性实验评价

Experimental Evaluation on the Displacing Characteristics of an Associating Polymer with Low Hydrophobic Monomer Content

刘义刚 丁名臣 韩玉贵 王业飞 孟祥海 赵 鹏 苑玉静

LIU Yigang DING Mingchen HAN Yugui WANG Yefei MENG Xianghai ZHAO Peng YUAN Yujing

常规低分子量疏水缔合聚合物疏水单体含量高、 疏水性与缔合作用强， 驱油中存在吸附滞留量大、 注入压 力高等问题。研究了具有低疏水单体含量、 超高分子量特征的缔合聚合物 （AP-P5） 溶液的渗流及驱油特征， 并与 强疏水性聚合物（HAPAM）和普通部分水解聚丙烯酰胺（HPAM）对比。结果表明， 由于疏水性的减弱， AP-P5的 表观黏度、 注入压力、 阻力系数（Fr）、 残余阻力系数（Frr）和动态滞留量均明显小于 HAPAM， 但仍高于 HPAM。 在极差为 10.0的非均质模型中， HAPAM和 AP-P5能同时进入高、 低渗透层， 表现出一定的调剖能力， 而 HPAM主 要分布在高渗层中， 很少进入低渗层， 剖面调整能力较前者弱。由于 AP-P5疏水性减弱、 动态滞留量降低、 运移 能力增强， 聚合物驱的持久性和有效性得以改善， 均质模型中的驱油效率增幅高于 HAPAM， 但仍低于 HPAM。 仅从增大驱油效率的角度， 应进一步降低聚合物疏水性。非均质模型中， AP-P5兼顾了剖面调整与吸附滞留量 的降低， 其采收率增幅高于 HAPAM和 HPAM。图9表 3参15

Due to high hydrophobic-monomers content， strong hydrophobicity and association， the traditional low-molecular-weight hydrophobic association polymers usually had some problems during flooding， such as large adsorption and retention and poor injectivity. The flow and displacement characteristics of an associated polymer（AP-P5）which had low hydrophobic-monomers content and ultra-high-molecular weight were investigated. Moreover，these properties were compared with those of strong-hydrophobic polymer（HAPAM）and partially hydrolyzed polyacrylamide（HPAM） . The results showed that， due to the weakened hydrophobicity， the apparent viscosity， injection pressure， resistance factor（Fr）， residual resistance factor（Frr）and dynamic retention of AP-P5 were all much lower than those of HAPAM but still higher than those of HPAM. In the heterogeneous model with a permeability ratio of 10.0， HAPAM and AP-P5 could both enter high and low permeable layers while HPAM mainly existed in high permeable layer， indicating that HAPAM and AP-P5 had stronger profile control capability than HPAM. For the weakened hydrophobicity， reduced dynamic retention and increased migration capacity， the persistence and effectiveness of AP-P5 flooding were improved. As a result， the enhanced oil displacement efficiency of AP-P5 was higher than that of HAPAM， but still lower than that of HPAM in homogeneous models. So it could be concluded that the hydrophobicity of polymers should be further reduced from the perspective of enhancing displacement efficiency. In heterogenous models， AP-P5 could both improve the injection profile and reduce adsorption and retention of polymers. Consequently， the enhanced oil recovery rate of AP-P5 was higher than that of HAPAM and HPAM.