Reservoir sensitivity analysis for heterogeneity and anisotropy effects quantification through the cyclic CO2-Assisted Gravity Drainage EOR process - A case study from South Rumaila oil field

被引:26
作者
Al-Mudhafar, Watheq J. [1 ,2 ,3 ]
Rao, Dandina N. [1 ,3 ]
Srinivasan, Sanjay [1 ,4 ]
机构
[1] 3207 PFT Hall, Baton Rouge, LA 70803 USA
[2] Basrah Oil Co, Basra, Iraq
[3] Louisiana State Univ, Baton Rouge, LA 70803 USA
[4] Penn State Univ, University Pk, PA 16802 USA
关键词
Reservoir heterogeneity; Anisotropy; CO2; flooding; Sensitivity analysis; Enhanced Oil Recovery;
D O I
10.1016/j.fuel.2018.02.121
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
The effects of reservoir heterogeneity and anisotropy were quantified through the cyclic CO2-Assisted Gravity Drainage (GAGD) process performance in a heterogeneous multi-layering sandstone reservoir. First, an integrating workflow of multiple-point geostatistics (MPS) and Sequential Gaussian Simulation (SGSIM) was adopted for the lithological and petrophysical modeling to capture the fluvial depositional environment and preserve the reservoir heterogeneity, respectively. Next, sensitivity analysis was conducted through compositional reservoir simulation and Design of Experiments (DoE) to eliminate the non-influencing petrophysical parameters on the GAGD process performance. Then, heterogeneity and anisotropy effects were quantified with respect to reservoir permeability and anisotropy ratio, respectively. The effects was attained by generating and incorporating multiple reservoir stochastic images (realizations) that capture the entire geological uncertainty space into the reservoir flow simulation. Based on the reservoir flow responses, it was concluded that the impact of permeability anisotropy on the GAGD process is higher than that of heterogeneity, because the main concept of GAGD process considers vertical fluid movements from the top-layer injection wells to the horizontal producers.
引用
收藏
页码:455 / 468
页数:14
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