Application of production splitting method based on inverse distance weighted interpolation in X Oilfield

As the premise and basis of reservoir utilization research, production splitting is of great significance for production dynamic analysis, remaining oil characterization, adjustment of development plan and enhanced oil recovery (EOR). In this paper, through sufficient and detailed investigation, the optimal production splitting method was determined by comparing the current production splitting methods, then its model establishment, solution and implementation were provided, and finally applied to X Oilfield. The investigation and analysis found that the production splitting method based on inverse distance weighted interpolation (PS-IDWI) had the most advantages in the commonly used production splitting methods. The results of production splitting showed that the average relative error of layered cumulative oil production ratio (ARE-LCOPR) of Well X1 obtained by PS-IDWI was 11.72%, which was far lower than that obtained by formation coefficient method (i.e. KH method); the ARE-LCOPR of 120 wells in X Oilfield obtained by PS-IDWI was 15.37%, and its accuracy was nearly 3 times greater than that obtained by KH method; PS-IDWI had high accuracy and applicability. Therefore, it is suggested that PS-IDWI should be preferred for production splitting to improve the accuracy of production splitting, which is conducive to reservoir utilization and remaining oil evaluation, development adjustment and EOR. (C) 2021 The Author(s). Published by Elsevier Ltd.