METHOD OF LIMITING WATER INFLUX INTO WELL Russian patent published in 2024 - IPC E21B33/138 E21B43/22 

FIELD: oil industry.

SUBSTANCE: proposed invention relates to oil industry and can be used in development of carbonate deposits with high fracturing. Method of limiting water influx into the well involves pumping into the formation a hydrocarbon-based emulsion which hydrophobises the pore space and contains oil, formation water and an emulsifier-water repellent. After injection of the composition, it is held in water influx channels for structural strengthening of the composition. In addition, the emulsion composition contains soot; benzene is used as the emulsifier-water repellent, with the following ratio of components, wt.%: oil 35–38, formation water 60, emulsifier-water-repellent agent – benzene 1–3, soot 2, density 1.01–1.15 g/cm³, viscosity 700–1,050 mPa⋅c.

EFFECT: increased efficiency of water influx limitation into well due to increased stability of aggregate state of pumped emulsion and improvement of quality of isolation of water influx zones in well, increasing oil recovery factor of productive formation and reducing rate of watering of production wells.

1 cl, 2 tbl, 2 ex