日用化学工业（中英文）2025，Vol.55Issue(12)：1544-1551,8.DOI:10.3969/j.issn.2097-2806.2025.12.006
封汽窜用栲胶冻胶的制备及其流变性能研究
Preparation and rheological properties of a gel based on tannin extract for steam channeling plugging
摘要
Abstract
Tannin extract can be used to address the problem of gas channeling during steam huff-and-puff process.However,it faces difficulties in gel formation at low temperatures and poor stability at high temperatures.Through a systematic study on the high-temperature gel-forming properties of valonea tannin extract,myrica tannin extract,and acacia tannin extract,and comprehensively considering factors such as stability,structural characteristics,and economic factors,myrica tannin extract was finally chosen as the key component of the gelling agent.Experiments were carried out in which the mass fraction of myrica tannin extract in the investigated system was in the range of 4%-8%.The results showed that the optimized formula of the gelling solution consisted of 6%myrica tannin extract,4%water-soluble phenolic resin,3%nano-SiO2,and 0.1%catalyst.The gelling solution containing 2%-6%tannin extract had a long gelling time at low temperatures.After heat treatment at 250℃for 3 days,the elastic modulus of the gel strength was in the range of 8-10 kPa,the degree of dehydration after 30 days was less than 15%,and the structure was stable after long-term heat treatment,which was suitable for the plugging of steam channeling in offshore oilfields.By observing the microstructure of the gel with Cryo-SEM,it was found that nano-SiO2 could transform the gel from a loose structure into a dense three-dimensional network structure,which contributed to its enhanced thermal stability.By using thixotropic loop method,it was found that when the amount of nano-SiO2 exceeded 3%,the gelling solution had thixotropy,which was beneficial for formation plugging.Elastic modulus,viscous modulus,and creep tests showed that adding nano-SiO2 could increase the elastic modulus of the gel.When the amount of nano-SiO2 was 3%,the peak value of elastic modulus of the gel after 30 days of aging could reach 0.256 34 MPa,which could significantly delay the strain overshoot.When the amount of nano-SiO2 was 5%,the yield stress of the gel could reach a maximum of 1 500 Pa.This research could provide technical support for solving the problem of steam channeling during steam huff-and-puff process in oilfields.关键词
蒸汽窜流/栲胶冻胶/纳米二氧化硅颗粒/胶凝规律/耐热性Key words
steam channeling/gel of tannin extract/nano-SiO2/gelling regularity/thermal stability分类
能源科技引用本文复制引用
周文超,孙君,付云川,孙艳萍..封汽窜用栲胶冻胶的制备及其流变性能研究[J].日用化学工业（中英文）,2025,55(12):1544-1551,8.基金项目
海油发展重大科技专项课题"海上稠油油藏多介质辅助蒸汽热采技术研究"(HFKJ-ZX-GJ-2023-03-04) （HFKJ-ZX-GJ-2023-03-04）
