Research on the Correction Method of the Capillary End Effect of the Relative Permeability Curve of the Steady State

Yanyan Li, Shuoliang Wang, Zhihong Kang, Qinghong Yuan, Xiaoqiang Xue, Chunlei Yu and Xiaodong Zhang
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Yanyan Li: College of Energy Resources, China University of Geosciences, Beijing 100083, China
Shuoliang Wang: College of Energy Resources, China University of Geosciences, Beijing 100083, China
Zhihong Kang: College of Energy Resources, China University of Geosciences, Beijing 100083, China
Qinghong Yuan: Reservoir Department, Tianjin Dagang Oilfield Group Engineering Construction Co., Ltd., Binhai 300280, China
Xiaoqiang Xue: Reservoir Department, Tianjin Dagang Oilfield Group Engineering Construction Co., Ltd., Binhai 300280, China
Chunlei Yu: Oil and Gas Field Development Department, Shengli Oil Field Exploration and Development Research Institute, Dongying 257001, China
Xiaodong Zhang: Reservoir Department, Shandong Province Zhong Di Yi Cai Petroleum Technology Co., Ltd., Dongying 257001, China

Energies, 2021, vol. 14, issue 15, 1-15

Abstract: Relative permeability curve is a key factor in describing the characteristics of multiphase flow in porous media. The steady-state method is an effective method to measure the relative permeability curve of oil and water. The capillary discontinuity at the end of the samples will cause the capillary end effect. The capillary end effect (CEE) affects the flow and retention of the fluid. If the experimental design and data interpretation fail to eliminate the impact of capillary end effects, the relative permeability curve may be wrong. This paper proposes a new stability factor method, which can quickly and accurately correct the relative permeability measured by the steady-state method. This method requires two steady-state experiments at the same proportion of injected liquid (wetting phase and non-wetting phase), and two groups of flow rates and pressure drop data are obtained. The pressure drop is corrected according to the new relationship between the pressure drop and the core length. This new relationship is summarized as a stability factor. Then the true relative permeability curve that is not affected by the capillary end effect can be obtained. The validity of the proposed method is verified against a wide range of experimental results. The results emphasize that the proposed method is effective, reliable, and accurate. The operation steps of the proposed method are simple and easy to apply.

Keywords: tight reservoir; capillary end effect; relative permeability curve (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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