石油与天然气地质 ›› 2013, Vol. 34 ›› Issue (1): 124-128.doi: 10.11743/ogg20130117

• 油气开发 • 上一篇    下一篇

考虑应力敏感性的低渗透油藏油井产能分析

刘峰1, 王裕亮2, 陈小凡1, 苏云河3, 王玥1   

  1. 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 西部钻探工程有限公司 定向井技术服务公司,新疆 乌鲁木齐 830026;
    3. 中国石油 勘探开发研究院 廊坊分院,河北 廊坊 065007
  • 收稿日期:2012-09-24 修回日期:2012-12-26 出版日期:2013-02-28 发布日期:2013-03-18
  • 作者简介:刘峰(1984—),男,博士研究生,油藏工程和数值模拟。
  • 基金资助:

    国家科技重大专项(2011ZX050102003)。

Analysis on oil well productivity of low-permeability reservoirs with stress-sensitivity being taken into considerations

Liu Feng1, Wang Yuliang2, Chen Xiaofan1, Su Yunhe3, Wang Yue1   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploration, Southwest Petroleum University, Chengdu, Sichuan 610500, China;
    2. Directory Well Drilling Service Company, CNPC Xibu Drilling Engineering Company Limited, Urumqi, Xinjiang 830026, China;
    3. Langfang Branch, PetroChina Exploration and Development Research Institute, Langfang, Hebei 065007, China
  • Received:2012-09-24 Revised:2012-12-26 Online:2013-02-28 Published:2013-03-18

PDF (PC)

1107

被引次数

44

摘要：

低渗透油藏的单井产能主要受储层应力敏感性的影响。油藏流体采出后,地层压力下降,有效应力增加,孔隙度和渗透率均降低,导致油井产能下降。笔者在只考虑基于渗透率降低对低渗透油井产能方程影响的基础上,考虑了孔隙度随应力变化对油井产能的影响,建立了同时考虑渗透率和孔隙度的产能应力敏感性方程,并提出了产能-应力敏感性指数的概念。随着低渗透储层应力敏感性的增强,应力敏感性常数增大,产能-应力敏感性指数同时增大,油井的日产油量迅速降低。新的产能-应力敏感性方程使低渗透油藏油井产能计算结果更加简化和准确。通过实例验证与分析,产能-应力敏感性指数对低渗透油藏单井产能有较强的影响,随着产能应力敏感性指数的增加,油井的无阻流量下降速度降低。与只考虑渗透率降低的油井产能方程相比,新方程更能反映低渗透油藏的实际生产情况,对合理开发低渗透油藏具有一定的指导意义。

关键词: 应力敏感性, 产能, 孔隙度, 渗透率, 低渗透油藏

Abstract:

Stress-sensitivity is one of the main factors that affect single well productivity in low-permeability rese-rvoirs.It is common sense that wells tend to produce less after certain volumes of reservoir fluids were recovered as that would cause drop-down in formation pressure,porosity and permeability and increase of effective stress.The authors modified the previous productivity function of low-permeability oil wells that only considers the influences of permeability decrease by incorporating the influences of stress on porosity,established a new stress-sensitive productivity function with both porosity and permeability being taken into consideration,and proposed the concept of productivity-stress-sensitivity index.Along with the intensifying of stress-sensitivity of low-permeability reservoirs and increase of stress-sensitivity constant,the productivity-stress-sensitivity index also enlarges,and daily oil production quickly shrinks.The new function simplifies the calculation process and improves the accuracy.Practices show that the productivity-stress-sensitivity index exerts a strong influence upon the productivity of wells in low-permeability reservoirs.As the index increases,the decreasing of open flow capacity of oil wells slows down.Compared with the old function,the new one reflects better the actual production of low-permeability reservoirs and therefore could be used to guide their development.

Key words: stress sensitivity, productivity, porosity, permeability, low-permeability reservoir

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