LAUSR

The methods of extracting viscous oil from oil leg reservoir (oil rims) of the Cenomanian horizon are experimentally investigated (PK layers). It was found that steam contributes to the swelling and dispersion of clay components of the rock, i.e. thermal methods cannot be recommended for use. The effect of oil on the rock properties of PK layers was investigated. It was shown that permeability, wettability and degree of oil displacement by saline water depend on oil saturation, and the rock transition from hydrophilicity to hydrophobicity occurs at oil saturation above 75%. Alkaline flooding and the use of non-ionic surfactants are not effective for enhancing the recovery of PK layers. For oil displacement, it is recommended to apply a water-gas mixture or sequentially inject solvent and water (or water-gas mixture).