Study on Numerical Simulation Method and Remaining Oil Distribution of Horizontal Well in Low Permeability and Thin Reservoir

Abstract

Horizontal wells have been developing on a large scale in an oil field with low permeability and thin oil layer, and the horizontal wells have entered the high water-cut stage, it is difficult to adjust the horizontal wells by conventional technology. Therefore, it is necessary to apply the numerical simulation results of horizontal wells to improve the development level of horizontal wells. Through the study of horizontal well man-made fracture equivalent simulation and layered and segmented simulation technology, the fine simulation of horizontal wells is realized. Combined with different well pattern types, seepage differences and research results of numerical simulation models, the distribution rule of remaining oil in horizontal wells and the production status of different segments of horizontal wells are summarized. Finally, it is clear that the remaining oil in the horizontal well area of the low permeability and thin oil layer is mainly concentrated in the areas of poor water drive control, interference between vertical wells and horizontal wells, pressure interference, interlayer interference and fracture interference. Based on the analysis of the production status of different segments of horizontal wells, the main adjustment direction in the horizontal well area is thin injection thick production section and thick injection thin production section with strong regional heterogeneity and relatively large connectivity differences. The study on numerical simulation method and remaining oil distribution of horizontal well in low permeability and thin oil reservoir provide the basis for fine potential tapping of horizontal well in the next step.KeywordsLow permeability thin oil reservoirHorizontal wellNumerical simulationRemaining oil