油气地质与采收率2025，Vol.32Issue(2)：163-169,7.DOI:10.13673/j.pgre.202310019
气驱水与水驱气流体微观分布特征研究
Characterization of microscopic distribution of fluids during gas displacing water and water displacing gas
汪周华 1张鸿宇 1张娟 2廖浩奇 1黄仕林3
作者信息
- 1. 西南石油大学 油气藏地质及开发工程全国重点实验室,四川 成都 610500
- 2. 中国石油西南油气田分公司勘探开发研究院,四川 成都 610095
- 3. 西南石油大学 油气藏地质及开发工程全国重点实验室,四川 成都 610500||中国石化西南油气分公司 勘探开发研究院,四川 成都 610041
- 折叠
摘要
Abstract
Gas-water relative permeability measurement is a common method to describe the flow process in gas reservoirs with wa-ter.However,the results of relative permeability measurements vary significantly between different test methods and types of cores.To deepen the understanding of the microscopic distribution characteristics of fluid and flow mechanism during the gas-water flow process,this paper took YB Gas Field in Sichuan Basin as the research object and used nuclear magnetic resonance(NMR)technol-ogy to quantitatively describe the microscopic distribution of the two phases before and after relative permeability test.The distribu-tion results were explained based on the gas-water two-phase flow mechanism obtained by the previous researchers with the visual-ization model.The results showed that the displacement efficiencies of micron-scale(>1 μm)pores during the water displacing gas and gas displacing water are basically the same with the two test methods,but the displacement efficiency in submicron-scale(0.1-1 μm)and nanoscale(<0.1 μm)pores during water displacing gas is relatively higher.Moreover,the water in the submicron-scale and nanoscale pores is not mainly produced during the gas displacing water.For fractured and porous cores,the displacement effi-ciencies in micron-scale pores of fractured cores are relatively low,while the displacement efficiencies in submicron-scale and na-noscale pores are relatively high.The difference in the microscopic distribution of fluids with the two test methods is mainly caused by the different capillary forces inside the pores,while the difference between the two types of cores is primarily due to the differ-ence in their main flow channels.关键词
气水两相渗流/核磁共振/微观分布特征/渗流机理/相渗曲线Key words
gas-water two-phase flow/NMR/microscopic distribution characteristics/flow mechanism/relative permeability curve分类
能源科技引用本文复制引用
汪周华,张鸿宇,张娟,廖浩奇,黄仕林..气驱水与水驱气流体微观分布特征研究[J].油气地质与采收率,2025,32(2):163-169,7.
