METHOD TO INCREASE OIL FIELD RECOVERY AND OIL PRODUCTION Russian patent published in 2010 - IPC E21B43/20 

FIELD: oil-and-gas industry.

SUBSTANCE: invention is intended for oil and gas industries in both running fields and closed because of flooded formations. Substance claim: proposed method comprises determination of daily amplitudes of earth tides caused by solar and lunar attraction forces and daily revolution of the Earth about its axis, cyclic pumping of water into formation and continuous extraction of fluid. In compliance with this invention, first amount of produced fluid is determined, its water content and oil production depending upon volume of pumped-in water for current period of time. Then, daily amplitudes of earth tides are determined, depending upon caused by solar and lunar attraction forces and daily revolution of the Earth about its axis for, at least 28 days in the area of oil field. Consecutive intervals of variations in daily amplitudes of earth tides from maximum to minimum are selected to determine consecutive decrease in said daily amplitudes from maximum to minimum and their duration. Phases of consecutive decrease in said daily amplitudes from maximum to minimum and their duration are determined. Fluid and oil extraction graphs are plotted normalised to unit of time that show dependence upon water injection volumes per oil field area during entire period of extraction. Minimum possible volume of water injection into wells is determined for oil field from the point of intersection of fluid and oil extraction curves. Then, cyclic injection of water into wells is performed during the second half of the phase of decrease in consecutive daily amplitudes of earth tides and duration of the first half of next phase of increase in consecutive daily amplitudes of earth tides. Note here that water injection volumes are gradually decreased to minimum and thereafter, continuous fluid extraction is performed. Selection of consecutive periods of variations in daily amplitudes of earth tides from maximum to minimum is carried out by plotting contours of upper and lower envelopes of maxima and minima of consecutive daily amplitudes of earth tides.

EFFECT: higher efficiency of proposed method.

2 cl, 1 ex, 2 dwg