Method of salinity increased permeability low permeability oil reservoir

摘要

1. A method for increasing the permeability of low-permeability saline oil reservoir comprising a solid sodium chloride salt (halite), comprising dissolving halite working agent - fresh or brackish water by the cyclic stimulation, each of which includes the injection of working agent in low permeability oil reservoir saline through the borehole closing the well at the time of dissolution of halite, liquid selected from the formation through the same well, wherein the feedback loops to the deposit is repeated until full coverage of saline formation influence, opening contained therein oil and generation of all the recoverable oil, the injection of fresh or brackish water into the formation is carried out at the maximum possible constant bottomhole pressure to the well injectivity reduction in 2-8 times in comparison with its value at the beginning of injection, and the selection of formation fluid produced at the lowest possible constant bottomhole pressure to eject the liquid on the surface of not less than 1.1-1.5 volumes injected before this in fresh or brackish vody.2 formation. A method according to claim 1, characterized in that the dissolution rate and duration halite shut-phase is determined by calculation based on the results of model studies kerna.3. A method according to claim 1, characterized in that the perforations in the wellbore interval is set low frequency hydrodynamic pulsator and pumping fresh water or brackish water into the formation is carried out in low frequency pulsation mode with a frequency up to 10 Hz to increase its penetrating power into a saline reservoir and