Infill drilling is one of the most effective methods for increasing the oil recovery factor and withdrawal rate of remaining recoverable reserves. At the same time, it should be noted that the drilling of infill wells has a negative impact on the current oil (liquid) production of base wells. Therefore, the decision of drilling infill wells should be made taking into account the assessment of its efficiency. This research considers and proposes methods for assessing the efficiency of infill drilling and its influence on the current oil (liquid) production of base wells. To characterize the efficiency of infill drilling, dimensionless coefficients are proposed. These coefficients serve to estimate additional current or total oil (liquid) production of infill wells, taking into account the total losses of oil production of base wells. This oil (liquid) production is called net oil (liquid) production. Four independent types of loss of oil production from base wells due to infill drilling were identified: well interference, reduction in recoverable oil reserves of base wells, additional transfers to injection of base wells, and infrastructure limitations. To assess the efficiency of infill drilling, two calculation modules were developed and tested: the statistical and the analytical modules. The statistical module estimates actual and predicted total losses of oil production of base wells from implemented infill drilling based on actual liquid (oil) production data. The analytical module estimates predicted total losses of oil production of base wells from intended infill drilling based on the analytical model. This model is based on the redistribution of the average equilibrium reservoir pressure on the considered area of the oil reservoir during infill drilling. The results of using the modules are shown in case of considering areas with infill drilling at Samotlor and Priobskoe oilfields.
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