﻿ 聚合物驱剖面返转数值模拟方法研究 Research on Numerical Simulation Method of Section Inversion during Polymer Flooding

Journal of Oil and Gas Technology
Vol.38 No.01(2016), Article ID:17120,7 pages
10.12677/jogt.2016.381008

Research on Numerical Simulation Method of Section Inversion during Polymer Flooding

Ailing Zheng1, Xiaodong Kang2, Dehua Liu1

1College of Petroleum Engineering, Yangtze University, Wuhan Hubei

2CNOOC Research Center, Beijing

Received: Dec. 7th, 2015; accepted: Jan. 17th, 2016; published: Mar. 15th, 2016

Copyright © 2016 by authors, Yangtze University and Hans Publishers Inc.

ABSTRACT

The inversion of injection profile was easily induced in single slug injection in heterogeneous reservoirs; it was unfavorable for enhancing oil recovery. In allusion to the problems of high cost, long duration and heavy workload of laboratory simulation, which were hard to be described by conventional reservoir simulation, based on percolation theory and physical-chemical property in polymer flooding, an uncross flow linear percolation model of two parallel layers was established. Compared with the characteristics of simulation software, a simulation method for profile inversion was proposed based on the sorting of reservoir physical property. The studied method is used for systematically studying the factors influencing the profile inversion; the result shows that the permeability contrast, its injection time and its concentration are the major factors affecting the inversion; it provides a technical support for studying the regulation and the reduction of profile inversion in polymer flooding.

Keywords:Polymer Flooding, Profile Inversion, Numerical Simulation, Physical Experiment, Inversion Mechanism

1长江大学石油工程学院，湖北 武汉

2中海石油研究总院，北京

1. 引言

2. 聚合物驱剖面返转现象理论研究

(1)

(2)

(3)

3. 剖面返转数值模拟方法

3.1. 聚合物驱数值模拟关键参数

1) 聚合物吸附

2) 聚合物黏度

3) 渗透率下降系数

(4)

4) 不可及孔隙体积(IPV)

3.2. 数值模拟方法研究

4. 实例应用

SZ36-1油田为海上普通稠油油田，油田1993年投产，采用反九点井网注水开发，2003年开展聚合物驱单井试验，2008年开始实施井组扩大注聚。采用聚合物驱剖面返转新数值模拟方法剖析了注聚井剖面返转规律及影响因素。

5. 结论

1) 根据渗流力学理论，建立了聚合物驱两层并联不窜流线性渗流模型，揭示了聚合物驱剖面返转的影响因素在于高、低渗透层的物性差异及聚合物物化性质。

(a) Influence of relative permeability curves (b) Influence of polymer adsorption data(a) 相对渗透率曲线的影响 (b) 吸附数据的影响 (c) Influence of polymer residual resistance factors (d) Influence of polymer inaccessible pore volumes(c) 残余阻力系数影响 (d) 不可及孔隙体积影响

Figure 1. Relative liquid injection rate curves of influence factors

Figure 2. Relative liquid injection rate curves of different methods

Figure 3. Relative liquid injection rate fitting curves of physics experiment and numerical simulation

Figure 4. Relative liquid injection rate curves of different permeability ratios

Figure 5. Relative liquid injection rate curves of different polymer injection time

Figure 6. Relative liquid injection rate curves of different polymer concentrations

2) 通过理论分析、室内物理试验及油藏数值模拟技术，提出了根据储层物性分区进行特征参数差异赋值的剖面返转数值模拟方法。

3) 剖析了不同渗透率级差、注聚时机、聚合物质量浓度下的剖面返转规律，聚合物驱过程中，应尽量降低层系内的渗透率级差，增加低渗透油层的动用程度；选择合适的聚合物注入时机，减弱剖面返转对驱油效果的影响；根据储层渗透率选择合适的聚合物质量浓度，实现非均质储层不同渗透层均衡驱替。

Research on Numerical Simulation Method of Section Inversion during Polymer Flooding[J]. 石油天然气学报, 2016, 38(01): 55-61. http://dx.doi.org/10.12677/jogt.2016.381008

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