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Discussion on the sweep efficiency of hybrid steam-chemical process in heavy oil reservoirs: An experimental study

Petroleum Science 2022年第6期19卷 2905-2921页

作者： Xiao-Hu Dong Xiu-Chao Jiang Wei Zheng Hui-Qing Liu Ren-Jie Liu Wu-Chao Wang De-Shang Zeng Tai-Chao Wang State Key Laboratory of Petroleum Resources and Prospecting China University of PetroleumBeijing102249China State Key Laboratory of Offshore Oil Exploitation Beijing100028China

Non-condensable gas(NCG),foam and surfactant are the three commonly-used additives in hybrid steam-chemical processes for heavy oil *** application can effectively control the steam injection profile and increase the sweep *** this paper,the methods of microscale visualized experiment and macroscale 3D experiment are applied to systematically evaluate the areal and vertical sweep efficiencies of different hybrid steam-chemical ***,a series of static tests are performed to evaluate the effect of different additives on heavy oil ***,by a series of tests on the microscale visualized model,the areal sweep efficiencies of a baseline steam flooding process and different follow-up hybrid eor processes are obtained from the collected 2D ***,they include the hybrid steam-N_(2)process,hybrid steam-N2/foam process,hybrid steam-surfactant process and hybrid steam-N2/foam/surfactant process(N2/foam slug first and steam-surfactant co-injection then).From the results of static tests and visualized micromodels,the pore scale eor mechanisms and the difference between them can be *** the vertical sweep efficiencies,a macroscale 3D experiment of steam flooding process and a follow-up hybrid eor process is ***,combing the macroscale 3D experiment and laboratory-scaled numerical simulation,the vertical and overall sweep efficiencies of different hybrid steam-chemical processes are *** indicate that compared with a steam flooding process,the areal sweep efficiency of a hybrid steam-N2process is *** is caused by the high mobility ratio in a steam-N2-heavy oil *** contrast,the enhancement of sweep efficiency by a hybrid steam-N2/foam/surfactant process is the *** is because of the high resistance capacity of NCG foam system and the performance of ***,a surfactant can interact with the oil film in chief zone and reduce the interfacial energy,and thus

关键词： Heavy oil reservoirs Visualized model Scaled 3D model Sweep efficiency hybrid eor process Multicomponent and multiphase fluids

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