Pore-Scale Simulation of WAG Floods in Mixed-Wet Micromodels

被引:13
作者
van Dijke, M. I. J. [1 ]
Lorentzen, M. [1 ]
Sohrabi, M. [1 ]
Sorbie, K. S. [1 ]
机构
[1] Heriot Watt Univ, Inst Petr Engn, Edinburgh EH14 4AS, Midlothian, Scotland
来源
SPE JOURNAL | 2010年 / 15卷 / 01期
关键词
3-PHASE FLOW; GAS INJECTION; POROUS-MEDIA; OIL-RECOVERY; WETTABILITY; DRAINAGE; LAYERS;
D O I
10.2118/113864-PA
中图分类号
TE [石油、天然气工业];
学科分类号
0820 ;
摘要
In this paper, the simulation is described of Water-Alternating-Gas injection (WAG) flood cycles in 2D etched glass mixed-wet micromodel, using a 3d pore-scale network model for three-phase immiscible flow in porous media of arbitrary wettability Although most network model input parameters can be explicity derived from the experiments, the precise wettability parameters are not directly available Therefore, a sensitivity study was conducted using the network model in 2D mode, to obtain the wettability charateristics (i.e. the contact angle values and distribution) and the fraction of water-wet pores Good qualitative and quantitative agreement was found between the experimental and simulated recoveries over the various WAG cycles, and the final residuals were well reproduced (as well as some observed "random recovery jumps") The simulated displacement statistics showed many so-called multiple-displacement chains involving oil, up to approximately the third WAG cycle The experimental and simulated fluid distributions were generally in good agreement in that (a) different gas fingers were observed during various gasfloods, (b) oil movement was observed mainly during the first WAG cycles, and (c) during waterfloods significant amounts of gas were displaced Additionally, priviously described simulation of water-wet and oil-wet experiments are compared with the present mixed-wet simulations There are close similarities between the mixed-wet and oil-wet cases, which both mauntain some continuity of oil through wetting films, but these cases are quite different from the water-wet case which has continuity of water through wetting films in all pores This paper further validates the pore-scale mechanisms incorporated in a network model capable of predicting three-phase relative permeabilities and capillary pressures for complicated process, such as WAG
引用
收藏
页码:238 / 247
页数:10
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