石油学报 ›› 2010, Vol. 31 ›› Issue (5): 801-805.DOI: 10.7623/syxb201005017

• 油田开发 • 上一篇    下一篇

残留聚合物再利用数值模拟研究

冯其红 1,2  史树彬 1  付  晓 3  戴彩丽 1  唐恩高 4   

  1. 1中国石油大学石油工程学院  山东青岛  266555; 2中国石油大学石油天然气工程学院  北京  102249; 3中国石油大学外国语学院  山东东营  257061; 4中海油研究总院技术研究部  北京  100027
  • 收稿日期:2010-02-03 修回日期:2010-04-13 出版日期:2010-09-25 发布日期:2010-11-30
  • 通讯作者: 冯其红
  • 作者简介:冯其红,男,1969年6月生,1993年毕业于石油大学(华东), 现为中国石油大学(华东)教授,中国石油大学(北京)在站博士后,主要从事油藏工程和调剖堵水方面的教学和科研工作。
  • 基金资助:

    国家高技术研究发展计划(863)项目(2007AA06200)、山东省泰山学者建设工程(TS20070704)和国家油气重大专项(2008ZX05024-002)联合资助。

Numerical simulation of the residual polymer reutilization

FENG Qihong 1,2  SHI Shubin 1  FU Xiao 3  DAI Caili 1  TANG Engao 4   

  • Received:2010-02-03 Revised:2010-04-13 Online:2010-09-25 Published:2010-11-30

摘要:

为了描述残留聚合物再利用过程中絮凝剂和絮凝体在地下的运移规律和渗流特征,在化学驱模型的基础上,考虑了固体组分的滞留以及对孔隙度和渗透率的影响,建立了残留聚合物再利用调剖的三维两相五组分数学模型。分别对模型各组分方程进行了差分离散,最后转化成线性方程组进行求解,其中在对絮凝剂和絮凝体质量守恒方程求解时,利用算子分离技术将方程转化为抛物线方程和双曲线方程进行求解,提高了计算的精度和速度。建立了概念模型,对影响残留聚合物再利用调剖效果的地层参数和注入参数进行了敏感性分析。结果表明,随着渗透率级差的增大,残留聚合物再利用提高采收率的幅度先增加后减小;注絮凝剂越早、注入量及注入浓度越大,残留聚合物再利用提高采收率效果越好。

关键词: 残留聚合物, 絮凝剂, 絮凝体, 滞留, 数值模拟, 敏感性分析

Abstract:

The present paper, based on chemistry flooding model and integrated with the detention of solid constituents and its influence on porosity and permeability, deciphered underground migration law and vadose characteristics of flocculant and floc units in the process of residual polymer reutilization by means of establishing a three-dimension, two-phase and five-component mathematical model for simulating profile control of residual polymer reutilization. An infinite difference method was used to discretize equations of each component in the model, respectively and then a system of linear equations was obtained. The mass-conservation equation of flocculants and floc-units was split into a parabolic equation for diffusion and a hyperbolic equation for convection by means of operator-splitting algorithms. This approach improved the precision and speed of calculations. The paper introduced a number of conceptual models and carried out sensitivity analyses on formation parameters and injection parameters that influence the effect of profile control on residual polymer reutilization. The results indicated that with the increase of permeability grade, the extent of residual polymer reutilization for the recovery enhancement increased first and then decreased, and that the earlier the flocculant injection, the bigger the quantity of injected flocculants and the higher the concentration of injected flocculants, the better the effect of residual polymer reutilization for the recovery enhancement.

Key words: residual polymer, flocculant, floc units, detention, numerical simulation, sensitivity analysis