新疆石油地质 ›› 2010, Vol. 31 ›› Issue (6): 626-628.

• 油藏工程 • 上一篇    下一篇

砂岩气藏地层压力下降对束缚水饱和度的影响

李莲明1, 李治平2, 车艳1   

  1. 1.中国石油 长庆油田分公司 第二采气厂,陕西 榆林 719000;
    2.中国地质大学 能源学院,北京 100083
  • 收稿日期:2010-04-05 修回日期:2010-06-04 发布日期:2021-01-18
  • 作者简介:李莲明(1974-),男,四川洪雅人,高级工程师,博士,油气田开发,(Tel)029-86502158(E-mail)llm_cq@petrochina.com.cn.

Influence of Formation Pressure Fall on Irreducible Water Saturation in Sandstone Gas Reservoir

LI Lian-ming1, LI Zhi-ping2, CHE Yan1   

  1. 1. No.2 Gas Production Plant, Changqing Oilfield Company, PetroChina, Yulin, Shaanxi 719000, China;
    2. School of Energy Resources, China University of Geosciences, Beijing 100083, China
  • Received:2010-04-05 Revised:2010-06-04 Published:2021-01-18

摘要: 根据岩石孔隙结构毛细管束简化模型对应Kozeny 方程,在假设岩石变形束缚水均匀附着在毛细管壁的厚度保持不变的基础上,推导建立了地层压力下降束缚水饱和度变化理论关系式。依据岩石变形实验数据和初始束缚水饱和度Swi0,通过实例计算,确定了地层压力下降束缚水饱和度变化规律。5 口气井岩样分析结果表明,随着地层压力下降,岩石中束缚水饱和度Swi 是逐渐增加的,这对产水气井合理高效开发具有实际指导意义。

关键词: 砂岩气藏, 地层压力, 孔隙度, 渗透率, 岩石体积应变, 束缚水饱和度

Abstract: According to the Kozeny equation of the simplified model for capillary bundle in rock pore structure, on the assumption that the thickness of irreducible water homogeneously adhering on capillary wall keeps unchangeable, this article presents the theoretical formula for irreducible water saturation variation with formation pressure fall, and the calculated irreduclible water saturation variation is determined by core samples from five gas wells. The case analysis indicates that the irreducible water saturation is gradually increased with the formation pressure fall-off. This is significant to guide the rational and efficient development of the producing water gas wells in sandstone gas reservoir.

Key words: sandstone gas reservoir, formation pressure, porosity, permeability, rock bulk strain, irreducible water saturation

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