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裂缝性砂岩污染储层井底压力响应特征

断块油气田

2013年 20卷第03期

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Title

Response characteristics of bottomhole pressure on reservoir contamination
in fractured sandstone

作者

范俊强龙小军刘洪李政田宝振

单位

中国石油渤海钻探第五钻井分公司，河北河间 062450 中国石化江汉油田分公司物探研究院，湖北武汉 430034 长江大学计算机科学学院，湖北荆州 434023

Organization

No.5 Drilling Company, Bohai Drilling Company, PetroChina, Hejian 062450, China Geophysical Research Institute, Jianghan Oilfield Company, SINOPEC, Wuhan 430034, China College of Computer Science, Yangtze University, Jingzhou 434023, China

摘要

裂缝性砂岩；污染储层；井底压力；污染半径

Abstract

Through the study of reservoir contamination of dual-porosity medium fractured sandstone, a mathematical model, in which reservoir permeability presents index change in damaged zone, is established. The bottomhole pressure response characteristics curve of reservoir contamination on dual-porosity fractured sandstone is drawn out through the using of difference method with asymmetry grid and resolving of the model with Garssian elimination. The main influencing factors of bottomhole pressure are analyzed. The result indicated that the response characteristics of bottomhole pressure response characteristics curve at different stages are clear, that the greater contaminated radius is, the more obvious channeling is in the area and the later the response is in external region, the deeper the derivative curve concaves, and that the smaller channeling factor is, the deeper the derivative curve concaves.

关键词：

通过双孔介质裂缝性砂岩污染储层的研究，建立了以污染区储层渗透率呈指数变化的数学模型。采用不均匀网格的差分方法，由高斯消元法对模型求解，绘制出双孔裂缝性砂岩污染储层井底压力响应特征曲线，并分析了影响井底压力的主要因素。结果表明：井底压力响应特征曲线各阶段特征明显; 污染半径越大，污染区内窜流现象越明显，外区响应越晚，压力导数曲线下凹越深; 窜流系数越小，压力导数曲线下凹越深。;

Keywords:

fractured sandstone; reservoir contamination; bottomhole pressure; contamination radius;

基金项目

DOI

10.6056/dkyqt201303019