INCREASING THE EFFICIENCY OF WELL FLUSHING UNDER CONDITIONS OF ABNORMALLY LOW FORMATION PRESSURES AT LATE STAGES OF GAS CONDENSATE FIELDS DEVELOPMENT

Abstract

The article addresses the flushing of production wells in gas condensate fields with abnormally low reservoir pressures. It details the processes of formation damage in the near-wellbore zone caused by the use of technological fluids, identifying areas with reduced permeability. A system of criteria is proposed for selecting well flushing technologies under such conditions, based on technological, economic, and environmental indicators. Selection criteria are recommended with a focus on achieving optimal geological, technical, and economic results during well workovers, while meeting environmental protection standards and ensuring operational efficiency. The article analyzes the use of various technological fluids in well flushing during workovers in gas condensate fields at late development stages with abnormally low reservoir pressures. Technological fluid compositions and their application methods are studied and systematized, with a particular emphasis on optimizing their effectiveness. Requirements are developed to ensure effective well flushing while preserving reservoir integrity and minimizing environmental impact. The current state of technological fluids is described, emphasizing their ability to maintain reservoir filtration-capacity properties and prevent complications that could arise in the wellbore. The developed fluid compositions, due to optimized component ratios, reduce filtrate invasion and form weak intermolecular bonds with reservoir rock, thereby preserving the reservoir’s properties. Conditions for technically and economically effective well flushing under low-pressure conditions are identified, and fluid formulations have been optimized for field application. Overall, the article provides a comprehensive framework for selecting and applying well flushing technologies in challenging reservoir conditions, ensuring effective maintenance while safeguarding subsurface resources and protecting the environment from contamination.