The research of the gas wells bottomhole formation zone treatment efficiency

Abstract

The final stage of development of natural gas fields is characterized by depletion of reservoir energy, deterioration of the bottomhole formation zone, which leads to low gas and condensate flow rates. Development of new and improvement of existing technologies for stimulation of oil and gas production for the conditions of Ukrainian fields should be carried out taking into account the fact that most fields are in the final stage of development; production wells are mainly marginal, water-flooded and are characterized by a significant decrease in the natural filtration properties of the bottomhole formation zone due to its colmatage with filtrates and dispersed particles used in drilling, well operation or workover, deposits of resins, asphaltens, paraffins, forming of high viscosity emulsions, swelling of the clay particles of the formation present in the reservoir, and the presence of other clogging agents. The well, its bottomhole zone and the formation part between the wells are interconnected and interacting elements of a single system. Failure to take into account the features and degree of impact of the bottomhole formation zone as one of the system’s elements leads to a general decrease in the development efficacy of the field as a whole. Therefore, the choice of technologies for the impact on the bottomhole formation zone requires a very careful assessment, taking into account the technological efficiency and payout time. The aim of the research is to determine the influence of the bottomhole formation treatment parameters on the well productivity. The tasks have been performed by analyzing the literature and conducting analytical calculations of the impact of various parameters of the treatment zone on the flow rate of the well. The described methods and results of calculations can be implemented in production when planning the action on the bottomhole formation zone by selecting the optimal treatment parameters at different stages of field development.