徐志涛 尹洪军 王小欣 赵欢 赵二猛

摘 要：针对大庆油田D区块聚合物驱油效果变差的状况，研究聚合物在不同物性储层中的渗流特征具有重要的意义。依据大庆油田D区块地质特征和开发特征，建立了代表该区块的概念模型。在此基础上，通过数值模拟，研究并分析了全区的含水率、采出程度、井底流压的变化特征，同时，分析了不同渗透层的分流率特征。通过研究不同阶段的注采井间的压力特征和饱和度特征，分析得出了D区块聚合物驱油效果变差的主要原因是由于层内的非均质性，造成厚油层顶部剩余油的富集。该研究结果对油田的后续开发具有一定的指导意义。

关 键 词：聚合物;渗流特征;压力特征;饱和度特征

中图分类号：TE 357 文献标识码： A 文章编号： 1671-0460（2015）06-1385-03

Study on Seepage Characteristics of Polymer Flooding

in D Block of Daqing Oilfield

XV Zhi-tao 1，YIN Hong-jun 1，WANG Xiao-xin 2，ZHAO Huan 1，ZHAO Er-meng 1

（1. Key Laboratory of Enhanced Oil Recovery of Ministry of Education，Northeast Petroleum University，Heilongjiang Daqing 163318，China; 2. Daqing Oilfield Company No.6 Oil Recovery Plant ， Heilongjiang Daqing 163114，China）

Abstract： For the situation that polymer flooding effect in D block of Daqing oilfield is getting worse， the study of polymer seepage characteristics in the reservoirs with different physical properties has an important significance. According to the geological characteristics and development characteristics of D block of Daqing oilfield， conceptual model of the block was established. On this basis， the change of the characteristics of water cut， degree of reserve recovery， bottom hole flowing pressure of the block was researched and analyzed by the numerical simulation. At the same time， characteristics of the flux ratio of different permeable formation were analyzed. By studying the pressure and saturation characteristics in different stages of injection-production well， the main reasons to cause poor polymer flooding effect in the D block were analyzed. The results show that the main reason is intraformational heterogeneity which causes the remaining oil enrichment at the top of thick oil layers. The result has a certain guiding significance of follow-up development to the oilfield

Key words： Polymer; Seepage characteristics; Saturation characteristics; Pressure characteristics

大慶油田D区块砂泥岩交互分布，厚油层所占储量比例大，厚油层以多段多韵律为主，层内非均质性严重，现井网对层内结构单元控制程度低，会存在一定剩余油[1-6]。在长期的注水和注聚开发过程中受储层非均质性、胶结强度、水油流度比以及强注强采等因素的影响，聚合物驱油效果逐渐变差，影响区块采收率及开发效益的提高[7-10]。因此，研究聚合物在不同物性储层中的渗流特征具有重要的意义。

目前对聚合物驱油渗流特征方面的研究较少，本文通过建立大庆油田D区块的概念模型，模拟研究了聚合物驱油不同阶段的渗流特征，分析得出了驱油效果变差的原因，为油田的开发提供一定的依据，促进油田的可持续开发。……