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

作　　者：刘义刚 丁名臣[2] 韩玉贵 王业飞[2] 孟祥海 赵鹏 苑玉静 LIU Yigang;DING Mingchen;HAN Yugui;WANG Yefei;MENG Xianghai;ZHAO Peng;YUAN Yujing(Bohai Oilfield Research,Tianjin Branch of China National Offshore Oil Corporation,Tianjin 300452,P R of China;Engineering,China University of Petroleum,Qingdao,Shandong 266580,P R of China)

机构地区：[1]中海石油(中国)有限公司天津分公司渤海石油研究院,天津300452 [2]中国石油大学(华东)石油工程学院,山东青岛266580

出　　处：《油田化学》2018年第2期296-301,共6页Oilfield Chemistry

基　　金：国家科技重大专项"大型油气田及煤层气开发"(项目编号2016ZX05058-003-003)

摘　　要：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。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 I0.0, 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 bc 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.

关 键 词：疏水缔合聚合物 部分水解聚丙烯酰胺 表观黏度 渗流特征 驱油特征 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]