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gas channeling control with an in-situ smart surfactant gel during water-alternating-CO_(2) enhanced oil recovery

Petroleum Science 2023年第5期20卷 2835-2851页

作者： Xin-Jie Luo Bing Wei Ke Gao Bo Jing Bo Huang Ping Guo Hong-Yao Yin Yu-Jun Feng Xi Zhang Polymer Research Institute State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065SichuanChina National Key Laboratory of Oil and gas Reservoir Geology and Exploitation Southwest Petroleum UniversityChengdu 610500SichuanChina National Key Laboratory of Offshore Oil Exploitation CNOOC Research Institute Ltd.Beijing 102209China

Undesirable gas channeling always occurs along the high-permeability layers in heterogeneous oil reservoirs during water-alternating-CO_(2)(WAG)flooding,and conventional polymer gels used for blocking the“channeling”paths usually suffer from either low injectivity or poor gelation ***,we for the first time developed an in-situ high-pressure CO_(2)-triggered gel system based on a smart surfactant,N-erucamidopropyl-N,N-dimethylamine(UC22AMPM),which was introduced into the aqueous slugs to control gas channeling inWAG *** water-like,low-viscosity UC22AMPM brine solution can be thickened by high-pressure CO_(2) owing to the formation of wormlike micelles(WLMs),as well as their growth and shear-induced structure buildup under shear *** thickening power can be further potentiated by the generation of denser WLMs resulting from either surfactant concentration augmentation or a certain range of heating,and can be impaired via pressurization above the critical pressure of CO_(2) because of its soaring solvent *** flooding tests using heterogeneous cores demonstrated that gas channeling was alleviated by plugging of high-capacity channels due to the in-situ gelation of UC22AMPM slugs upon their reaction with the pre-or post-injected CO_(2) slugs under shear flow,thereupon driving chase fluids into unrecovered low-permeability areas and producing an 8.0% higher oil recovery factor than the conventional WAG *** smart surfactant enabled high injectivity and satisfactory gelation control,attributable to low initial viscosity and the combined properties of one component and CO_(2)-triggered gelation,*** work could provide a guide towards designing gels for reducing CO_(2) spillover and reinforcing the CO_(2) sequestration effect during CO_(2) enhanced oil recovery processes.

关键词： CO_(2)flooding Enhanced oil recovery gas channeling Water-alternating-CO_(2) Smart surfactant Gel

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A Research Progress of CO_(2)-Responsive Plugging channeling Gels

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Energy Engineering 2024年第7期121卷 1759-1780页

作者： Yang Xiong Jianxin Liu Xianhao Yi Bangyan Xiao Dan Wu Biao Wu Chunyu Gao Key Laboratory of Drilling and Production Engineering for Oil and gas Yangtze UniversityWuhan430100China School of Petroleum Engineering Yangtze UniversityWuhan430100China

In the heterogeneous reservoirs,CO_(2) flooding easily leads to CO_(2) gas channeling,which can seriously affect sweeping efficiency and reduce oil *** thoroughly investigating the advantages and shortcomings of various CO_(2) plugging technologies,this paper focuses on the feasibility of improving conventional water-alternating gas(WAG)through CO_(2)-responsive gel *** on the different chemical reaction mechanisms between the unique chemical structure and CO_(2),changes in the material’s physical and chemical properties can respond to CO_(2).The feasibility of utilizing these property changes for CO_(2)-responsive plugging is *** CO_(2)-responsive gels and gel nanoparticles have been extensively researched in different fields,such as energy,medicine,and *** paper surveys the molecular structures,chemical compositions,response mechanisms,and changes of these CO_(2)-responsive gels,aiming to draw insights into the carbon dioxide-enhanced oil recovery(CO_(2)-EOR)***,the key issues and future development direction of CO_(2)-responsive plugging gels were analyzed.

关键词： gas channeling sweep efficiency CO_(2)-responsive gel CO_(2)-EOR

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