西南石油大学学报（自然科学版）2017，Vol.39Issue(6)：131-139,9.DOI:10.11885/j.issn.1674-5086.2016.05.01.01
非均质特低渗透油藏CO2驱气窜规律研究
CO2 Channeling Sealing In Ultra-low-permeability Reservoirs
摘要
Abstract
To effectively seal preferential breakthrough channels and to increase the sweep volume and flooding efficiency of carbon dioxide,in-situ experimental models with different permeabilities were established,including a heterogeneous core model,a high permeability zone gas-channeling model,and a fracture model.CO2 was measured at different stages of breakthrough time,channeling time,and degrees of recovery.On this basis,a high-strength,high-performance channeling sealing agent,ethylene diamine,containing formation water,starch,unsaturated monomer,a cross-linking agent,and a gel control agent was selected to carry out the carbon dioxide sealing control experiments in various permeability core models.The channeling sealing agent reacted with the carbon dioxide and formed carbamate.The experimental results showed that the carbon dioxide sweep volume was seriously affected by the gas channeling,and the gas channeling effect became stronger with increasing core heterogeneity.As the gas flooding effect weakened in the low-variation permeability conditions,the degree of recovery decreased with the increasing permeability.When the variation exceeded 100,the degree of recovery decreased rapidly and the gas channeling became severe.The low permeability reservoirs became difficult to reach,and as a result,the degree of recovery decreased.By using the high-strength,high-performance channeling sealing agent,ethylenediamine,the relatively high permeable channeling layers in the matrix were sealed in a stable manner and the carbon dioxide flooding sweep volume was expanded effectively.The in-situ degree of recovery increased by over 30％.关键词
特低渗透油藏/非均质性/CO2驱/气窜时间/采出程度/封窜剂Key words
ultra-low permeability reservoir/heterogeneity/CO2 flooding/gas channeling time/degree of recovery/channeling sealing agent分类
能源科技引用本文复制引用
赵习森,石立华,王维波,白远,田丰..非均质特低渗透油藏CO2驱气窜规律研究[J].西南石油大学学报（自然科学版）,2017,39(6):131-139,9.基金项目
国家科技重大专项(2011ZX05003-001) （2011ZX05003-001）
