METHOD FOR INTENSIFICATION OF HYDROCARBON INFLOWS FROM CLAY-CONTAINING COMPLEX OIL-PRODUCING ROCKS Russian patent published in 2022 - IPC E21B43/20 

FIELD: oil industry.

SUBSTANCE: invention relates to the oil industry, namely to intra-contour flooding of reservoirs and maintenance of reservoir pressure in the development of complex oil deposits with a clay-containing collector for low-rate wells. A method for the intensification of hydrocarbon inflows from clay-containing complex collectors of oil-producing rocks includes pumping of fresh water into injection wells. Pumping of fresh water is performed into an open interval of uncovered rock or into a perforated interval of a cased well in a volume corresponding to a volume of an empty space. Then, the well is held until the dissolution of salts being in rock and the formation of additional emptiness in the occurrence of heat balance between liquid in the well and a reservoir system. At the same time, before and after pumping of fresh water and reservoir test, hydrodynamic and geophysical researches of wells are carried out. Upon results of researches, pick-up and return profiles are determined.

EFFECT: increase in an oil recovery coefficient of low-rate wells in the development of complex oil deposits with a clay-containing collector due to the formation of an additional system of cracks in low-permeable collectors and the connection of a wellbore of injection wells to permeable rock lenses, provision of ecological safety.

1 cl, 2 dwg