天然气工业2025，Vol.45Issue(9)：59-67,9.DOI:10.3787/j.issn.1000-0976.2025.09.005
高含硫边底水气藏注CO2控水治硫提高天然气采收率:实验与模拟
Water control and sulfur treatment to enhance gas recovery by CO2 injection in sour gas reservoirs with edge/bottom water:Experiment and simulation
摘要
Abstract
Carbonate sour gas reservoirs with edge/bottom water,as an import part of natural gas resources in China,are widely distributed in major gas provinces such as the Sichuan Basin and the Tarim Basin,and their development effectiveness and recovery factors are seriously impacted by edge water invasion and sulfur deposition during the development process.This paper systematically investigates the mechanisms of CO2 injection for water and sulfur control and enhanced gas recovery by means of laboratory experiment,molecular simulation and numerical simulation.The following results are obtained.First,CO2 injection improves gas recovery through three mechanisms:replenishing formation elastic energy;preferentially entering deep high-permeability zones and occupying the flow channels to push back the invading edge water while relieving water-locking effect;and driving interwell residual natural gas toward the second row of production wells during secondary development stage.Second,the strong solvation interactions between CO2 and sulfur molecules can effectively dissolve elemental sulfur in reservoirs,thus unblocking the channels.Third,CO2 exhibits advantages in competitive adsorption over elemental sulfur,stripping sulfur deposits from rock surfaces.Laboratory experiments confirm that CO2 injection can reduce sulfur saturation by over 40%.Fourth,numerical simulation of typical well groups in the Puguang Gas Field indicates that CO2 injection can achieve significant effect in water control and gas recovery enhancement,with the effect ranking as synchronous injection-soak-production>continuous displacement after pressure buildup>continuous displacement>depletion.In conclusion,CO2 injection technology has the dual functions of"water control"and"sulfur control".Future research should focus on the key issues such as quantitative characterization of CO2-water-sulfur-gas multiphase competitive adsorption,synergetic mechanism of CO2 flooding and storage in edge-water gas reservoirs,and injection-production parameter optimization to provide new technical means for the efficient development of sour gas reservoirs with edge/bottom water.关键词
普光气田/边水碳酸盐岩气藏/硫沉积/水侵/注CO2/实验与模拟/提高采收率Key words
Puguang Gas Field/Edge-water carbonate gas reservoir/Sulfur deposition/Water invasion/CO2 injection/Experiment and simulation/Enhanced gas recovery分类
能源科技引用本文复制引用
曾大乾,张睿,游瑜春,宋兆杰,石志良,李童,彭松,李倩..高含硫边底水气藏注CO2控水治硫提高天然气采收率:实验与模拟[J].天然气工业,2025,45(9):59-67,9.基金项目
国家自然科学基金企业创新发展联合基金集成项目"三大盆地深层—超深层海相油气高效勘探开发基础研究"(编号:U24B6001)、国家自然科学基金项目"海相深层油气富集机理与关键工程技术基础研究"(编号:U19B6003)、中国石油化工股份有限公司科技项目"普光气田剩余气分布及提高采收率技术"(编号:P23198). （编号:U24B6001）
