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displacement characteristics of CO_(2)flooding in extra-high water-cut reservoirs

Energy Geoscience 2024年第1期5卷 212-218页

作者： Rui Wang Yaxiong Zhang Chengyuan Lyu Zengmin Lun Maolei Cui Dongjiang Lang SINOPEC Petroleum Exploration and Production Research Institute BeijingChina

Carbon dioxide(CO_(2))flooding is a widely applied recovery method during the tertiary recovery of oil and gas.A high water saturation condition in reservoirs could induce a‘water shielding’phenomenon after the injection of CO_(2).This would prevent contact between the injected gas and the residual oil,restricting the development of the miscible zone.A micro-visual experiment of dead-end models,used to observe the effect of a film of water on the miscibility process,indicates that CO_(2)can penetrate the water film and come into contact with the residual oil,although the mixing is significantly ***,the dissolution loss of CO_(2)at high water-cut conditions is not *** oil-water partition coefficient,defined as the ratio of CO_(2)solubility in an oil-brine/two-phase system,keeps constant for specific reservoir conditions and changes little with an injection *** NMR device shows that when CO_(2)flooding follows water flooding,the residual oil decreasesdnot only in medium and large pores but also in small and micro *** levels of higher water saturation,CO_(2)displacement is characterized initially by a low oil production rate and high *** the CO_(2)breakthrough,the water-cut decreases sharply and the oil production rate increases *** response time of CO_(2)flooding at high watercut reservoirs is typically delayed and *** results were confirmed in a pilot test for CO_(2)flooding at the P1-1 well group of the Pucheng *** from this pilot study also suggest that a larger injection gas pore volume available for CO_(2)injection is required to offset the dissolution loss in high water saturation conditions.

关键词： displacement characteristics CO_(2)flooding Water shield phenomenon Oil-water partition coefficient Response time High water-cut

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Oxidization characteristics and thermal miscible flooding of high pressure air injection in light oil reservoirs

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Petroleum Exploration and Development 2022年第4期49卷 874-885页

作者： XI Changfeng WANG Bojun ZHAO Fang LIU Tong QI Zongyao ZHANG Xialin TANG Junshi JIANG Youwei GUAN Wenlong WANG Hongzhuang HE Dongbo SONG Xinmin HUA Daode ZHANG Xiaokun State Key Laboratory of Enhanced Oil Recovery Beijing 100083China PetroChina Research Institute of Petroleum Exploration&Development Beijing 100083China China University of Geosciences Beijing 100083China

Physical modeling,numerical simulation and field case analysis were carried out to find out the subsurface thermal oxidation state,thermal oxidation front characteristics and production dynamic characteristics of high pressure air injection thermal oxidation miscible flooding *** lighter the composition and the lower the viscosity of the crude oil,the lower the fuel consumption and the combustion temperature *** thermal oxidation front of light oil and volatile oil can advance stably,and a medium-temperature thermal oxidation stable displacement state can be formed in the light oil reservoir under high pressure *** strong thermal gasification and distillation,light oil and volatile oil are likely to form a single phase zone of gasification and distillation with thermal flue gas at the high-temperature and high-pressure heat front,finally,an air-injection thermal miscible *** light oil reservoirs,the development process of high-pressure air-injection thermal miscible flooding can be divided into three stages:boosting pressure stage,low gas-oil ratio and high-efficiency stable production stage and high gas-oil ratio production *** 70%of crude oil is produced during the boosting pressure stage and low gas-oil ratio high-efficiency and stable production stage.

关键词： light oil reservoir air flooding displacement characteristics high-pressure oxidation front thermal miscible flooding fire flooding

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