METHOD TO INCREASE FIELD OIL RECOVERY Russian patent published in 2013 - IPC E21B43/16 

FIELD: oil and gas industry.

SUBSTANCE: method to increase field oil recovery, including external periodical physical effects at an oil-containing bed in the area of this bed during Earth crust compression with account of amplitudes of solar-lunar effects, a connection is provided between solar and lunar time, and one time is converted into the other one, with account of the converted time the values of tide height are defined, using which, amplitudes of solar-lunar effects are defined, at the same time amplitudes of solar-lunar effects are determined in adjacent areas of Earth crust with different elastic characteristics, the time progress of tide under action of tide forces in points of effect at the oil-containing bed is determined by variation of phase shift - increase of time interval value between the nearest preceding moment of time of the upper moon culmination and the moment of upper moon culmination in the geographic meridian of oil-bearing bed location, differing by the fact that time progress of compression or extension is established under action of temporary forces with account of phase shift relative to the time of upper moon culmination due to geological conditions in the fixed geographic meridian, by measurement of Earth crust vibrations in different points of the location of oil-containing bed by means of extensometers; using the measured values, the table of tides and ebbs is generated in the meridian of the oil-bearing bed location, during the period of Earth crust extension and solar-lunar tides, liquid is pumped into wells, and prior to compression of the Earth crust, before solar-lunar ebbs, the liquid pumping is stopped.

EFFECT: increased recovery of fields both in new and depleted beds.