Analysis of influencing factors of horizontal well interwell interference and well spacing optimization in ultra-low permeability reservoir
The development of ultra-low permeability reservoirs in the Ordos Basin has entered its mid-term stage.New well infill drilling and refracturing of existing wells have become important methods for improving regional recovery rates,demonstrating trends of continuously decreasing well spacing and increasing fracturing scale.This has led to issues such as high well interference and rapid decline in single well production.To address the evaluation and prevention of well interference,a numerical simulation model of a horizontal well group was established using reservoir numerical simulation methods.This model evaluates the extent of stimulation after fracturing for individual wells and well groups and analyzes the influencing factors of well interference degree.The results indicate that higher matrix permeability,higher natural fracture permeability,larger single well fracturing scale,and smaller well spacing all contribute to more significant well interference.There exists an optimal matching relationship between single well EUR(estimated ultimate recovery)and overall block recovery rate,necessitating the optimization of reasonable well spacing to balance block recovery rate and single well cumulative production.These research findings provide effective guidance for well spacing optimization and the application of refracturing technology.
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