钻探工程2025，Vol.52Issue(2)：98-105,8.DOI:10.12143/j.ztgc.2025.02.013
基于CT扫描的低渗透岩心油水相对渗透率曲线计算研究
Calculation of oil-water relative permeability curves of low permeability cores based on CT scanning
摘要
Abstract
The oil-water relative permeability is a key parameter to characterize the effect of water injection in low permeability oil reservoirs.Due to the narrow pore size and large seepage resistance of low permeability reservoirs,the"end effect"of core leads to the inconsistency between the calculated oil-water relative permeability curves and the actual results,which affects the establishment of water injection development scheme of low permeability reservoirs.To avoid the influence of core"end effect"on the relative permeability,the CT scanning has been applied to monitor the in-situ water saturation profiles along the low permeability core at different time points.Based on the experience formula of oil-water relative permeability curve,optimal parameters of the relative permeability has been obtained by combining the oil-water flow methods in low permeability reservoirs,and the simulated annealing optimization theory.The results show that CT scanning test is a very effective test method which can not only monitor water saturation profile and water saturation characteristics in the central core,but also avoid the influence of"end effect".The global optimal relative permeability curve has been obtained with the Simulated Annealing method.The test results of water saturation and the pressure difference at both ends of the core accord with the results of calculation.This method has the advantage of high goodness of fit and satisfactory effect,with the relative permeability less than 8%.This method is proved to be efficient and accurate for calculating oil-water relative permeability curves,providing a strong support and guidance for the development of low permeability reservoirs.关键词
低渗透油藏/CT扫描技术/含水饱和度剖面/岩心"末端效应"/模拟退火/相对渗透率曲线Key words
low permeability oil reservoir/CT scanning technology/water saturation profile/"end effect"of the core/simulated annealing/relative permeability curve分类
能源科技引用本文复制引用
吴阳,刘天乐,任建飞,胡晨,莫邵元,焦春艳..基于CT扫描的低渗透岩心油水相对渗透率曲线计算研究[J].钻探工程,2025,52(2):98-105,8.基金项目
教育部岩土钻掘与保护工程研究中心开放基金(编号:202406) （编号:202406）
