METHOD FOR OPERATION OF OIL WELL WITH BOTTOM WATER Russian patent published in 2020 - IPC E21B43/14 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry and can be used in operation of oil well with presence of bottom water. According to the method, oil-saturated and water-saturated parts of the formation are re-opened. Two pumps are lowered into the well. Separate pumping of oil and water by said pumps. Pumps capacity is selected depending on the ratio of the amount of water and oil supplied to the well. Oil is collected on a day surface. Extracted water is pumped into the water-saturated formation. Level of water-oil contact in the formation and the thickness h of the transition zone from pure oil-saturated to pure water-saturated parts of the formation are determined by geophysical methods. One- or two-shaft equipment is lowered into the well for simultaneous separate operation of water-saturated and oil-saturated parts of the formation. Packer with height c=(0.2–1)·h is installed. Lower edge of the packer is placed in the zone where the purely water-saturated part of the formation begins. Perforation of oil-saturated part of formation is performed at distance a=(0.2–1.2)·h above packer. Perforation of water-saturated part of formation is performed at distance b=(0.5–2.0)·h below packer. Upper pump is arranged above perforated holes in oil-saturated part of formation. Lower pump is arranged not higher than intervals of perforation of water-saturated part of formation. Operating mode of pumps is selected so that to prevent formation of inverse cone, i.e. ingress of oil into the well under the packer.

EFFECT: raised efficiency of oil well operation with bottom water.

1 cl