101. Permeability and Viscosity Index Range Estimation of Imbibition Agent Suitable for Low-Permeability Reservoir
- Author
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Haihui Chen, Hongfu Fan, Fangge Gong, Yun Sun, Jian-Guo Li, Hongyan Cai, and Yi Zhang
- Subjects
Permeability (earth sciences) ,Materials science ,Low permeability ,Oil sands ,Thermodynamics ,Imbibition ,Binary regression ,Viscosity index - Abstract
Permeability and viscosity are important factors that influence the recovery efficiency of the imbibition agent. Based on the experimental data form 310 ultra-low- permeability cores and 360 oil sands, by curve-fitting method and binary regression method, the regressive analysis of imbibition efficiency, viscosity, and permeability force were carried out. The optimum range of permeability force ratio and viscosity ratio was estimated. The optimum range of each parameter in the extra/ultra-low-permeability reservoir pore was determined, by regression analysis and model experiments. The optimum interval of viscosity ratio was (2,28), which from the preliminarily estimated by curve-fitting method. The model passed the inspection of significance at the level of α = 0.01 which can explain 70% of the experimental data, which determined the optimum range of viscosity ratio in more than 6. The model obtained by analyzing the results of oil sand experiment passed the inspection of significance at the level of α = 0.01, which can explain 70% of the experimental data, which determined the optimum range of viscosity ratio in more than 2.9. By synthetically analyzing the consequence of oil sand and core experiment, the optimum range of viscosity was more than 2.9. The imbibition efficiency and the permeability of imbibition agent obtained by analyzing the results of oil sand experiment passed the inspection of significance at the level of α = 0.01, which can explain 75% of the experimental data, which determined the high imbibition efficiency when the permeability force ratio was more than 1.65. The model obtained passed the inspection of significance at the level of α = 0.01, which can explain 37.5% of the experimental data, which determined the high imbibition efficiency when the permeability force ratio was more than 1.35. By synthetically analyzing the consequence of these two experiments, the most suitable permeability force ratio between imbibition agent and water was greater than 1.35. The estimated results of the two properties of imbibition agent provide an important experimental and theoretical basis for screening and evaluation of imbibition agent and study the imbibition behaviors. more...
- Published
- 2019
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