Water-Polymer Perturbation Quantitative Characterization Method of Polymer Flooding in Offshore Heavy Oilfield

doi:10.12422/j.issn.1006-396X.2025.05.003

Abstract

Abstract:

In the process of offshore chemical drive, water drive well network and polydrive well network coexist after well network densification, which exerts a deep influence on oil development. To quantitatively characterize the perturbation degree of injected water and polymer, a water-polymer perturbation coefficient considering the dynamic changes of displacement volume of injected water and polymer is proposed. The production characteristics and laws under different displacement modes are analyzed based on the water-polymer perturbation coefficient, and the control strategies are discussed.The results show that the injected water would compress the polymer displacement area and exert an interference on the polymer front edge. Water-polymer perturbation coefficient has a good correlation with stage net oil increase curve, and water-polymer co-flooding process can be divided into five stages according to the water-polymer perturbation coefficient. In addition, water-polymer co-flooding has a better oil production than pure polymer flooding at the initial stage, but for a long period, development effect of pure polymer flooding is much better, and water-polymer alternating injection can balance the displacement front and improve the development effect. The result has a great significance to quantitatively characterize water-polymer perturbation degree and make adjustment measurements.

Key words: Water-polymer co-flooding, Perturbation coefficient, Quantitative characterization, Water-polymer alternative injection

摘要：

海上化学驱过程中井网加密后水驱井网和聚驱井网共存，对开发效果具有重要影响。为定量表征海上聚合物驱油田水聚扰动程度，提出了考虑注入水和注入聚合物驱替体积动态变化的水聚扰动系数，结合水聚扰动系数分析了不同驱替方式下的生产特征和规律，并讨论了调控策略。结果表明，水聚同驱过程中注入水会压缩聚合物驱替区域，对聚合物前缘产生一定的干扰；水聚扰动系数与阶段净增油曲线具有较好的相关性，根据水聚扰动系数可以将水聚同驱过程划分为5个典型阶段；水聚同驱方式的初期产油量高于纯聚合物驱方式，但整体产油量低于纯聚合物驱方式，通过水聚交替的方式可均衡驱替前缘，改善开发效果。研究成果对分析水聚同驱过程、定量表征水聚扰动程度以及制定后续调控措施具有一定的指导意义。

关键词: 水聚同驱, 扰动系数, 定量表征, 水聚交替

CLC Number:

TE345

Yuyang LIU, Zhijie WEI, Gongchang WANG, Wensheng ZHOU. Water-Polymer Perturbation Quantitative Characterization Method of Polymer Flooding in Offshore Heavy Oilfield[J]. Journal of Petrochemical Universities, 2025, 38(5): 22-29.

刘玉洋, 未志杰, 王公昌, 周文胜. 海上稠油聚合物驱水聚扰动定量表征方法[J]. 石油化工高等学校学报, 2025, 38(5): 22-29.

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URL: https://journal.lnpu.edu.cn/syhg/EN/10.12422/j.issn.1006-396X.2025.05.003

https://journal.lnpu.edu.cn/syhg/EN/Y2025/V38/I5/22

Figures/Tables 13

Fig.1 Distribution of injected fluids in pure polymer flooding and water-polymer co-flooding

Fig.2 Two-layer reservoir numerical simulation model with two injectors and three producers

Table 1 Parameters in the numerical simulation model

参数	数值
原始地层压力/MPa	15
孔隙度	0.30
高渗层渗透率/mD	3 000
低渗层渗透率/mD	500
地层厚度/m	10
最大吸附量/（mg·g^—1）	0.205
原油黏度/（mPa·s）	17.0
聚合物黏度/（mPa·s）	13.8
不可及孔隙体积/PV	0.3
残余阻力系数	3.0
盐水黏度/（mPa·s）	1.0
平均产液速度/（m³·d^—1）	72
注水量/（m³·d^—1）	120
注聚量/（m³·d^—1）	96

Fig.3 Stage division of simulation schemes

Fig.4 Concentration distribution of injected fluid at three different time under different injection methods

Fig.5 Chang of water-cut and cumulative oil production of oilfield under different injection methods

Fig.6 Water content variation curve of a single well under different injection methods

Fig.7 Cumulative oil production variation curve of a single well under different injection methods

Fig.8 Low permeability layer, high permeability layer, and overall recovery curve under different injection methods

Fig.9 The variation characteristics of water accumulation disturbance coefficient and cumulative water accumulation disturbance coefficient

Fig.10 Difference of oil increment between water- polymer co-flooding and pure polymer flooding

Fig.11 Variation curves of water content and cumulative oil production under different schemes

Fig.12 Variation curve of water aggregation disturbance coefficient under different schemes

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