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RISS 인기검색어
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- 저자 : Ailing Zheng (검색결과 3 건)
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Research on profile inversion pattern of polymer flooding
Ailing Zheng,Qianghan Feng,Qiansheng Wei,Dehua Liu 한국자원공학회 2018 Geosystem engineering Vol.21 No.3
Polymer flooding is becoming more common and more successful, and has made a great contribution to EOR. However, the statistical analysis of water injection profile data shows that the injection profile easily inverses during the process of single slug polymer flooding in heterogeneous reservoir. It is unfavorable for enhancing oil recovery. According to seepage mechanics theory, the cognition is determined that the injection rate distribution in high and low permeability layers depends on reservoir heterogeneity and physicochemical property of polymer. The basic reason of profile inversion lies in the different dynamic variation of resistance factors in the high and low permeability layers. In order to use existing reservoir simulation software to accurately describe the profile inversion characteristics, a processing method is submitted which is that different polymer characteristic parameters and relative permeability curves are assigned to different regions according to the distributions of reservoir characteristics during polymer flooding. Then, this processing method is used for systematically studying the profile inversion laws of different permeability ratio, polymer concentration and injecting-polymer occasion. The results show that these factors have great influence on the profile inversion. This provides a technical support for studying the profile inversion rules and corresponding improvement method.
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Research on profile inversion controlling methods of multi-slug polymer alternative injection
Ailing Zheng,Dehua Liu,Yanlin Shao 한국자원공학회 2020 Geosystem engineering Vol.23 No.2
The development practice of polymer flooding shows that the injection profile easily inverses during the process of single slug polymer flooding. The low effective or ineffective circulation of abundant injecting water in high permeability layer, low producing degree of low permeability layer and large polymer volume have influenced the sweep efficiency and oil recovery of polymer flooding. In view of these questions, the alternative injection method of various viscosity polymer slugs is studied. This paper explains the theory of enhanced oil recovery of multi-slug polymer alternative injection. The experiment results show that the alternative injection of high and low viscosity polymer slugs has a better effect than single slug polymer flooding. The mobility differences between high-low permeability layers can be effectively reduced. For a multi-layer heterogeneous reservoir, there is an optimal alternative cycle. Reasonable slug size can not only inhibit dominant channel forming in high permeability layer but also can effectively produce low permeability layer and control profile inversion to a certain extent. This provides a technical support for studying the controlling methods of profile inversion.
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Effects of solvent properties on cationic dyeing process of acrylic yarn
Zhengyu Zhang,Chunling Zheng,Ailing Yuan,Haibo Wang,Ling Zhu,Hong Xu 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.4
Cationic dye is a special dye for acrylics, but it is very difficult in dyeing through the core. In practice,the price of a special leveling agent for acrylic fiber is high, and uniform staining is poor. By mixing a number of organicsolvents in the dye bath, we can improve the structure of fibers and their deep-dyeing. We used n-propanol, isopropanoland benzyl alcohol as organic solvents, by adjusting the pH value and the appropriate temperature, and with specialdepth and leveling agent for dyeing soaping fastness contrast, to find economically viable process conditions.
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