СТРАТЕГІЇ ТА ТЕХНОЛОГІЇ КЕРУВАННЯ РЕТРОГРАДНОЮ КОНДЕНСАЦІЄЮ  В ГАЗОКОНДЕНСАТНИХ РОДОВИЩАХ

С. В.  Матківський

doi:10.31471/1993-9868-2026-2(46)-78-96

Автор(и)

С. В. Матківський Акціонерне Товариство «Укргазвидобування» 04053, вул. Кудрявська, 26/28, м. Київ, Україна

DOI:

https://doi.org/10.31471/1993-9868-2026-2(46)-78-96

Ключові слова:

ретроградна конденсація, підтримання пластового тиску, хімічні обробки, PVT-моделю-вання, підвищення конденсатовилучення.

Анотація

This paper summarises recent studies and engineering approaches to developing gas-condensate reservoirs with a high condensate content in the reservoir gas. It demonstrates that production under natural depletion leads to a decline in pressure below the dew point, resulting in retrograde condensate dropout, impaired gas flow and reduced well productivity. It discusses the evolution of concepts related to retrograde condensation, including the PVT description of gas-condensate systems, changes in produced-fluid composition and the impact of liquid-phase accumulation on gas relative permeability. Technologies for managing retrograde condensation are analysed and categorised by stage of application and direction of engineering impact. Methods for optimising drainage include drawdown control, horizontal wells and hydraulic fracturing. Methods aimed at preventing or delaying retrograde condensate dropout include maintaining reservoir pressure by injecting dry gas, nitrogen, carbon dioxide, water, or by using water-alternating-gas processes. Methods for mobilising or removing retrograde condensate that has already accumulated in the near-wellbore region include acid treatments, organic solvents, surfactants and wettability-alteration agents. Based on the analysis of experimental, numerical and field data, the conditions for the effective application of these technologies and their main limitations are identified. A diagnostic matrix is proposed to help select the most appropriate technological intervention, taking into account reservoir and bottomhole pressures, well productivity trends, changes in the condensate-to-gas ratio, the results of gas-condensate and pressure-transient studies, the composition of the produced gas, the water-to-gas ratio and how long the effect of a near-wellbore chemical treatment lasts. The results provide an applied basis for the justified selection of retrograde-condensation management technologies and for improving the ultimate condensate recovery factor

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Посилання

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