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

作　　者：汪周华[1] 张鸿宇 张娟[2] 廖浩奇 黄仕林[1,3] WANG Zhouhua;ZHANG Hongyu;ZHANG Juan;LIAO Haoqi;HUANG Shilin(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu City,Sichuan Province,610500,China;Exploration and Development Research Institute of PetroChina Southwest Oil&Gasfield Company,Chengdu City,Sichuan Province,610095,China;Exploration and Development Research Institute of SINOPEC Southwest Oil and Gas Branch,Chengdu City,Sichuan Province,610041,China)

机构地区：[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]中国石化西南油气分公司勘探开发研究院,四川成都610041

出　　处：《油气地质与采收率》2025年第2期163-169,共7页Petroleum Geology and Recovery Efficiency

摘　　要：气水相渗测试是描述有水气藏储层渗流过程的常用方法,但不同测试方法和不同类型岩心的相渗测试结果均存在较大差异。为了加深对气水渗流过程中的流体微观分布特征及渗流机理的认识,以四川盆地YB气田为研究对象,利用核磁共振技术定量描述气水两相在相渗测试前后的微观分布,并结合前人利用可视化模型得到的气水两相渗流机理对分布结果进行解释。结果表明:2种测试方法相比,水驱气与气驱水过程中微米级(>1μm)孔隙驱替程度基本一致,但水驱气过程中亚微米级(0.1~1μm)与纳米级(<0.1μm)孔隙驱替程度相对较高,而气驱水过程中亚微米级与纳米级孔隙内水相大部分未被动用。裂缝型与孔隙型岩心相比,裂缝型岩心微米级孔隙驱替程度相对较低,而亚微米级与纳米级孔隙驱替程度则相对较高。2种测试方法下流体微观分布的差异主要是由于孔隙内部毛管力的作用形式不同,而2类岩心存在差异的原因是其主要渗流通道不同。Gas-water relative permeability measurement is a common method to describe the flow process in gas reservoirs with water.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)technology to quantitatively describe the microscopic distribution of the two phases before and after relative permeability test.The distribution results were explained based on the gas-water two-phase flow mechanism obtained by the previous researchers with the visualization model.The results showed that the displacement efficiencies of micron-scale(>1μm)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(0.1–1μm)and nanoscale(<0.1μm)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 efficiencies in micron-scale pores of fractured cores are relatively low,while the displacement efficiencies in submicron-scale and nanoscale 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 difference 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 

分 类 号：TE312[石油与天然气工程—油气田开发工程]