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《复杂油气藏》[ISSN:1674-4667/CN:31-2019/TQ]

卷:

期数:

2013年03期

页码:

36-39

栏目:

油气开发

出版日期:

2013-09-25

文章信息/Info

Title:

Influence of rock stress sensitivity in tight gas reservoir on characteristics of gas/water two phase flows

作者:

刘宇展¹; 潘 毅¹; 郑小敏²; 成志刚²; 张 宪²; 杨大千²; 彭怡眉²

1.西南石油大学油气藏地质及开发工程国家重点实验室,四川 成都 610500; 2.中国石油集团测井有限公司油气评价中心,陕西 西安 710000

Author(s):

Liu Yuzhan¹; Pan Yi¹; Zheng Xiaomin²; Cheng Zhigang²;  Zhang Xian²; Yang Daqian²; Peng Yimei²

1.Southwest Petroleum University,Chengdu,Sichuan 610500; 2.Oil-gas Evaluation Center of Petroleum Logging CO.LTD,CNPC,Xi'an,Shanxi 710021

关键词:

致密气藏 渗透率 应力敏感 气水两相渗流 实验研究

Keywords:

tight gas reservoir;  permeability stress sensibility;  gas/water flow;  experimental study.

分类号:

TE135

文献标志码:

A

摘要:

致密气藏岩石孔隙小,喉道结构复杂,一旦骨架有效应力发生变化,骨架颗粒与孔喉结构的原始关系也发生变化,导致气水两相渗流通道发生变化,孔隙度、渗透率进一步降低,产能受到严重影响。通过实验深入研究致密储气层基质岩心和裂缝岩心在不同围压下应力变化导致气水两相流体的相对流动能力变化趋势,有利于认清致密气藏储层流体的渗流规律,并对其合理产能做出准确的评价。以长庆致密气藏P₁s、P₂h储层岩心为例,基于应力敏感实验,讨论了岩石渗透率应力敏感对致密储气层气水两相流动及产能的影响。

Abstract:

There are small pore and complicated structures of pores and throats in tight gas reservoirs.Once the skeleton effective stresses changed,original relationship between skeleton grains and structures of pores and throats also changed.As a result,channels of gas/water two phase flows also changed,and porosity and permeability of the reservoirs further reduced.These changes seriously affected productivity of the tight gas reservoirs.For matrix cores and fractured cores of tight gas reservoirs,it was studied to the changed trend of gas/water flow ability caused by stress changes under various confining pressures.Lab results are favorable to recognizing the flow rule of the tight gas reservoirs and accurately evaluating reasonable productivity.Let us take cores of Changqing tight gas reservoirs,P₁s、P₂h,for examples.According to rock stress sensitive experiments,this paper presents the effect of stress sensitivity of rock permeability on gas/water two phase flow ability and productivity of the tight gas reservoirs.