The study of components mass transfer mechanism and the rules of fluid phase alteration in the process of hydrocarbon gas drive

Lai, Fengpeng; Li, Zhiping; Yang, Zhihao; Li, Hong; Guo, Zhenzhen

doi:10.1016/j.jngse.2014.09.008

Cited by 6 publications

(4 citation statements)

References 5 publications

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“…In recent years, gas gravity drainage technology has been widely used worldwide (see [1][2][3][4]). The flow diagram is shown in Figure 1 and is a simplification of the real-life example with the horizontal interlayer.…”

Section: Formulation Of the Problemmentioning

confidence: 99%

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On the Short Wave Instability of the Liquid/Gas Contact Surface in Porous Media

et al. 2022

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We consider a problem of hydrodynamic stability of the liquid displacement by gas in a porous medium in the case when a light gas is located above the liquid. The onset of instability and the evolution of the small shortwave perturbations are investigated. We show that when using the Darcy filtration law, the onset of instability may take place at an infinitely large wavenumber when the normal modes method is inapplicable. The results of numerical simulation of the nonlinear problem indicate that the anomalous growth of the amplitude of shortwave small perturbations persists, but the growth rate of amplitude decreases significantly compared to the results of linear analysis. An analysis of the stability of the gas/liquid interface is also carried out using a network model of a porous medium. It is shown that the results of surface evolution calculations obtained using the network model are in qualitative agreement with the results of the continual approach, but the continual model predicts a higher velocity of the interfacial surfaces in the capillaries. The growth rate of perturbations in the network model also increases with decreasing perturbation wavelength at a constant amplitude.

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Section: Formulation Of the Problemmentioning

confidence: 99%

“…These problems are of great practical interest. Gas drainage is considered as an effective method to enhance oil recovery (see [1][2][3][4]). The efficiency of oil/water or oil/gas displacement depends on the stability of the interface between the oil-saturated region and the region containing displacement fluid (gas) [5].…”

Section: Introductionmentioning

confidence: 99%

On the Short Wave Instability of the Liquid/Gas Contact Surface in Porous Media

et al. 2022

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“…Hydrocarbon gas flooding is suitable for low-permeability reservoirs, high-viscosity crude oil reservoirs, and heavy crude oil reservoirs. Zhu 16 et al found that hydrocarbon gas components are similar to crude oil components, which can be dissolved in crude oil to form gas dissolution and desorption equilibrium. According to the principle of similar miscibility, when hydrocarbon gas is dissolved in crude oil, the viscosity and surface tension of crude oil will be reduced, making crude oil easier to flow.…”

Section: Introductionmentioning

confidence: 99%

Laboratory Experiments of Hydrocarbon Gas Flooding and Its Influencing Factors on Oil Recovery in a Low Permeability Reservoir with Medium Viscous Oil

Xian,

Hao,

Deng

et al. 2024

ACS Omega

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In view of the problems of low liquid production, a high proportion of high water cut wells, and poor development effect in the late stage of water flooding in the special sandstone reservoir of Niuquanhu "low permeability and medium viscosity crude oil", we carried out the research on hydrocarbon gas oil recovery and its influencing factors. First, the influence of different injected gas media on the physical properties of crude oil was analyzed. Second, the core displacement experiments of different gas injection media including CO 2 , CH 4 , and hydrocarbon gas were carried out by using the method of oil recovery comparison and optimization. Third, the indoor experimental study on the oil recovery of different influencing factors was carried out by using the method of controlling variables of influencing factors. Finally, the influence degree of different influencing factors on oil recovery was analyzed by a Spearman rank correlation coefficient analysis. The experimental results showed that the oil recovery of hydrocarbon gas is higher than that of CO 2 and CH 4 , which were 57, 51, and 18% respectively. This is mainly because hydrocarbon gas is similar to the components of crude oil and is more easily dissolved in crude oil. The experimental results of influencing factors showed that the higher the content of C 2 −C 4 , the higher the oil recovery, and the content of C 2 −C 4 will affect its dissolution with crude oil and its interaction with heavy component crude oil. The larger the permeability ratio, the lower the oil recovery, which was mainly due to the uneven distribution of injected gas in different regions. The higher the permeability, the lower the oil recovery, which was also due to the serious heterogeneity of the low permeability core of Niuquanhu; The results of Spearman rank correlation coefficient analysis based on different influencing factors and oil recovery showed that the order of influence of different factors on oil recovery was C 2 −C 4 content > permeability ratio > permeability > back pressure > gas injection rate. In the development process of hydrocarbon gas injection, we should control the C 2 −C 4 content, back pressure, and injection rate. The research in this study not only provides theoretical support for gas injection enhanced oil recovery technology in "low permeability and medium viscosity crude oil" reservoirs but also provides a new idea for the ranking of influencing factors.

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“…Jiang et al (2010) studied the mechanism of air flooding in low-permeability oil reservoirs by combining numerical simulation with physical simulation and demonstrated that air injection is useful for establishing an effective pressure displacement system. Lai et al (2014) studied the phase change and the characteristics of dynamic oil displacement efficiency in the process of gas injection based on the slim-tube test and pointed out that the main mechanism of hydrocarbon gas flooding was evaporation and condensation. CO 2 miscible flooding is to improve the volumetric sweep efficiency by reducing the viscosity and density of crude oil and ultimately achieve the purpose of improving oil recovery (Behnoudfar, 2018).…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Sweep Characteristics of Gas Gravity Drainage in the Interlayer Oil Reservoir

Wang

Zhou

et al. 2021

Front. Energy Res.

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Stable gas gravity drainage is considered an effective method to enhance oil recovery, especially suitable for deep buried, large dip angle, and thick oil reservoirs. The influence of reservoir heterogeneity on controlling the gas–oil interface and sweep characteristics of injected gas is particularly important to design reservoir development schemes. In this study, according to the interlayer characteristics of Donghe carboniferous oil reservoirs in the Tarim Basin, NW China, 2D visual physical models are established, in which the matrix permeability is 68.1 mD and average pore throat radius is 60 nm. Then, hydrocarbon gas gravity drainage simulation experiments are carried out systematically, and a high-speed camera is used to record the process of gas–oil flow and interface movement. In this experiment, the miscible zone of crude oil and hydrocarbon gas is observed for the first time. The interlayer has an obvious shielding influence, which can destroy the stability of the gas–oil interface and miscible zone, change the movement direction of the gas–oil interface, and reduce the final oil recovery after gravity drainage. The remaining oil mainly is distributed near the interlayers. The higher displacement pressure leads to increased stability of the gas–oil displacement front and later gas breakthrough, which leads to higher oil recovery. The lower gas injection rate contributes to a slower front velocity and wider miscible zone, which could delay gas breakthrough. For the immiscible gas gravity drainage, there is a critical gas injection rate, with which the oil recovery factor is the highest.

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The study of components mass transfer mechanism and the rules of fluid phase alteration in the process of hydrocarbon gas drive

Cited by 6 publications

References 5 publications

On the Short Wave Instability of the Liquid/Gas Contact Surface in Porous Media

On the Short Wave Instability of the Liquid/Gas Contact Surface in Porous Media

Laboratory Experiments of Hydrocarbon Gas Flooding and Its Influencing Factors on Oil Recovery in a Low Permeability Reservoir with Medium Viscous Oil

Experimental Study on Sweep Characteristics of Gas Gravity Drainage in the Interlayer Oil Reservoir

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