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Quantitative prediction of residual wetting film generated in mobilizing a two-phase liquid in a capillary model

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Petroleum 2015年第4期1卷 342-348页

作者： Harsh Joshi Liming Dai Industrial Systems Engineering University of ReginaReginaSK S4S 0A2Canada

This research studies the motion of immiscible two-phase liquid flow in a capillary tube through a numerical approach employing the volume of fluid method,for simulating the core-annular flow and water flooding in oil reservoirs of porous *** specifically,the simulations are a representation of water flooding at a pore scale.A capillary tube model is established with ANSYS Fluent and *** numerical results matches well with the existing data available in the *** of a less viscous liquid in a liquid of higher viscosity and the development of a residual wetting film of the higher viscosity liquid are thoroughly *** effects of capillary number,Reynolds Number and Viscosity ratio on the residual wetting film are studied in detail,as the thickness is directly related to the residual oil left in the porous media after water *** should be noticed that the liquids considered in this research can be any liquids of different viscosity not necessarily oil and *** results of this study can be used as guidance in the field of water flooding.

关键词： capillary model Residual wetting film Higher viscosity liquid Water flooding Numerical simulation Immiscible flow Oil slug mobilization

A new model for predicting irreducible water saturation in tight gas reservoirs

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Petroleum Science 2020年第4期17卷 1087-1100页

作者： Yu-Liang Su Jin-Gang Fu Lei Li Wen-Dong Wang Atif Zafar Mian Zhang Wei-Ping Ouyang School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580ShandongChina Department of Petroleum Technology University of KarachiKarachiPakistan Changqing Downhole Technology Company Chuanqing Drilling Engineering Co.LtdCNPCXi’an 710018ShaanxiChina

The irreducible water saturation(Swir) is a significant parameter for relative permeability prediction and initial hydrocarbon reserves ***,the complex pore structures of the tight rocks and multiple factors of the formation conditions make the parameter difficult to be accurately predicted by the conventional methods in tight gas *** this study,a new model was derived to calculate Swir based on the capillary model and the fractal *** model incorporated different types of immobile water and considered the stress *** dead or stationary water(DSW) was considered in this model,which described the phenomena of water trapped in the dead-end pores due to detour flow and complex pore *** water film,stress effect and formation temperature were also considered in the proposed *** results calculated by the proposed model are in a good agreement with the experimental *** proves that for tight sandstone gas reservoirs the Swir calculated from the new model is more *** irreducible water saturation calculated from the new model reveals that Swir is controlled by the critical capillary radius,DSW coefficient,effective stress and formation temperature.

关键词： Fractal theory Stress dependence effect capillary model Tight sandstone gas reservoir Irreducible water saturation

Effect of absorption boundary layer on nonlinear flow in low permeability porous media

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Journal of Central South University 2011年第4期18卷 1299-1303页

作者：王学武杨正明齐亚东黄延章 Institute of Porous Flow and Fluid Mechanics Chinese Academy of Sciences Langfang Branch Petro China Exploration and Development Research Institute

Taking low permeability cores of Daqing oilfield for example,the flow characteristics at low velocity were studied with the self-designed micro-flux measuring *** the throat distribution and capillary model,the thickness of fluid boundary layer under different pressure gradients was calculated,and the mechanism and influencing factors of nonlinear percolation were *** results show that the percolation curve of ultra-low rocks is nonlinear,and apparent permeability is not a constant which increases with pressure *** absorption boundary layer decreases with the increase of pressure gradient,and changes significantly especially in low pressure gradient,which is the essence of nonlinear *** absorption boundary layer is also found to be impacted by the surface property of rocks.

关键词： low permeability reservoirs percolation absorption boundary layer capillary model

Experimental and Theoretical Investigation of Nonlinear Flow in Low Permeability Reservoir

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Experimental and Theoretical Investigation of Nonlinear Flow...

Experimental and Theoretical Investigation of Nonlinear Flow in Low Permeability Reservoir

2011 International Conference on Energy and Environment(ICEE 2011)

作者： WANG Xue-wu YANG Zheng-ming SUN Yu-ping LIU Xue-wei Lang fang Branch Petro China Exploration and Development Research Institute

Taking low permeability cores of Daqing oilfield for example, the flow characteristics at low velocity were studied by using the self-designed micro-flux measuring instrument. Considering the throat distribution and capillary model, the thickness of fluid boundary layer under different pressure gradient was calculated, the mechanism and influencing factors of nonlinear percolation were discussed. The study showed that the percolation curve of ultra-low rocks was nonlinear, and apparent permeability was not a constant, which increased with pressure gradient. The absorption boundary layer decreased with the increase of pressure gradient, and changed significantly especially in low pressure gradient, which was the essence of bringing nonlinear percolation. The absorption boundary layer was also found to be impacted by surface property of rocks, and then impacted flow characteristics.

关键词： low permeability reservoirs percolation nonlinear absorption boundary layer capillary model

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Experimental and Theoretical Investigation of Nonlinear Flow...