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An efficient hybrid model for fractured reservoirs

Science China(Technological Sciences) 2016年第10期59卷 1609-1616页

作者： YAN Xia HUANG ZhaoQin YAO Jun LI Yang FAN DongYan SONG WenHui School of Petroleum Engineering China University of Petroleum (East China) Department of Oilfield Exploration & Development Sinopec

In this study, an efficient hybrid model is proposed to simulate the fluid flow in the reservoirs with multi-scale fractures, which cannot be easily modeled by neither the continuum models nor the discrete fracture models. In the proposed method, the small fractures are modeled by using an improved Multiple Sub-Region method, which can capture the strongly anisotropy of fracture elements and the effects of border region on the transmissibility and provide more accurate results, on the other hand, the large fractures are modeled explicitly as major fluid conduits by the Embedded Discrete Fracture Model. Then, an efficient numerical algorithm based on the mimetic finite difference method is developed to solve the hybrid method. At the end, several numerical examples are carried out to verify the accuracy and applicability of the proposed numerical model.

关键词： fractured reservoirs hybrid model oversampling approach multiple sub-region method mimetic finite difference

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Time-dependent model for two-phase flow in ultra-high water-cut reservoirs:Time-varying permeability and relative permeability

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Petroleum Science 2024年第4期21卷 2536-2553页

作者： Shao-Chun Wang Na Zhang Zhi-Hao Tang Xue-Fei Zou Qian Sun Wei Liu College of Energy Resources Chengdu University of TechnologyChengdu610059SichuanChina College of Petroleum Engineering Shandong Institute of Petroleum and Chemical TechnologyDongying257061ShandongChina

For the ultra-high water-cut reservoirs,after long-term water injection exploitation,the physical properties of the reservoir change and the heterogeneity of the reservoir becomes increasingly severe,which further aggravates the spatial difference of the flow *** this study,the displacement experiments were employed to investigate the variations in core permeability,porosity,and relative permeability after a large amount of water injection.A relative permeability endpoint model was proposed by utilizing the alternating conditional expectation(ACE)transformation to describe the variation in relative permeability based on the experimental *** on the time dependent models for permeability and relative permeability,the traditional oil-water two-phase model was improved and discretized using the mimetic finite difference method(MFD).The two cases were launched to confirm the validation of the proposed *** impact of time-varying physical features on reservoir production performance was studied in a real water flooding *** experimental results indicate that the overall relative permeability curve shifts to the right as water injection *** shift corresponds to a transition towards a more hydrophilic wettability and a decrease in residual oil *** endpoint model demonstrates excellent accuracy and can be applied to time-varying simulations of reservoir *** impact of variations in permeability and relative permeability on the reservoir production performance yields two distinct *** time-varying permeability of the reservoir results in intensified water channeling and poor development *** the other hand,the time-varying relative permeability enhances the oil phase seepage capacity,facilitating oil *** comprehensive time-varying behavior is the result of the combined influence of these two parameters,which closely resemble the actual conditions observed in oil field *** time-varyi

关键词： mimetic finite difference Water flooding reservoir Time-varying physical properties Numerical simulation

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