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An experimental and numerical study of chemically enhanced water alternating gas injection 被引量:2
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作者 Saeed Majidaie Mustafa Onur Isa M.Tan 《Petroleum Science》 SCIE CAS CSCD 2015年第3期470-482,共13页
In this work, an experimental study combined with numerical simulation was conducted to investigate the potential of chemically enhanced water alternating gas (CWAG) injection as a new enhanced oil recovery method. ... In this work, an experimental study combined with numerical simulation was conducted to investigate the potential of chemically enhanced water alternating gas (CWAG) injection as a new enhanced oil recovery method. The unique feature of this new method is that it uses alkaline, surfactant, and polymer additives as a chemical slug which is injected during the water alternating gas (WAG) process to reduce the interfacial tension (IFT) and simultaneously improve the mobility ratio. In essence, the proposed CWAG process involves a combination of chemical flooding and immiscible carbon dioxide (CO2) injection and helps in IFT reduction, water blocking reduction, mobility control, oil swelling, and oil viscosity reduction due to CO2 dissolution. Its performance was compared with the conventional immiscible water alter- nating gas (I-WAG) flooding. Oil recovery utilizing CWAG was better by 26 % of the remaining oil in place after waterflooding compared to the recovery using WAG conducted under similar conditions. The coreflood data (cumulative oil and water production) were history mat- ched via a commercial simulator by adjusting the relative permeability curves and assigning the values of the rock and fluid properties such as porosity, permeability, and the experimentally determined IFT data. History matching ofthe coreflood model helped us optimize the experiments and was useful in determining the importance of the parameters influencing sweep efficiency in the CWAG process. The effectiveness of the CWAG process in pro- viding enhancement of displacement efficiency is evident in the oil recovery and pressure response observed in the coreflood. The results of sensitivity analysis on CWAG slug patterns show that the alkaline-surfactant-polymer injection is more beneficial after CO2 slug injection due to oil swelling and viscosity reduction. The CO2 slug size analysis shows that there is an optimum CO2 slug size, around 25 % pore volume which leads to a maximum oil recovery in the CWAG process. This study shows that the ultralow IFT system, i.e., IFT equaling 10 2 or 10 3 mN/ m, is a very important parameter in CWAG process since the water blocking effect can be minimized. 展开更多
关键词 Enhanced water alternating gas (CWAG) Enhanced oil recovery Interfacial tension Mobilitycontrol ~ Water blocking
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Research and applications of novel jet techniques in well drilling,completion and fracturing 被引量:3
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作者 LI GenSheng SHEN ZhongHou +4 位作者 HUANG ZhongWei TIAN ShouCeng SHI HuaiZhong SONG XianZhi WANG HaiZhu 《Science Foundation in China》 CAS 2014年第2期68-80,共13页
Oil and gas have long been regarded as key elements for any industrialized country.China's economy and social security are largely dependent on oil and gas exploration and development.Nowadays,a great deal of atte... Oil and gas have long been regarded as key elements for any industrialized country.China's economy and social security are largely dependent on oil and gas exploration and development.Nowadays,a great deal of attention has been paid to various ways of efficiently developing oil and gas reserves.This paper presents an overview of research and applications of novel jet techniques in well-drilling,well-completion and fracturing.Supported by the National Natural Science Foundation of China,through years of effort,significant achievements have been made in this area.Not only has the systematic theory of novel jetting been established,but also its application has been proved practical in petroleum engineering.This paper focuses on the topics of the self-resonating cavitating jet,the abrasive water jet,and the supercritical CO_2 jet,in respect of theories,applications and prospects. 展开更多
关键词 Cavitating jet Abrasive water jet Supercritical carbon dioxide Well-drilling Well-completion FRACTURING Enhanced oil and gas recovery
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