METHOD FOR EXTRACTING OF OIL DEPOSIT Russian patent published in 2004 - IPC

FIELD: oil extractive industry.

SUBSTANCE: method includes drilling product and force wells, extracting oil from product wells and pumping displacing agent into force wells, which agent consists of two portions - gas and water. Pumping of gas is performed with face pressure of force wells equal to or higher than pressure of mixing of gas and oil, but lower than pressure of hydraulic disruption of beds, and face pressure of force wells is kept equal or higher than pressure needed for saturation of oil with gas, and gas for pumping into oil deposit is taken from adjacent gas deposit, additionally increasing its pressure in 4-5 times by means of 1-2 step compressor, while within oil area bed pressure is formed to be higher than firsthand, and said oil area is screened from surrounding area by horizontal extracting wells, said surrounding area having bed pressure lower or equal to firsthand pressure. Deposit is screened from surrounding area with low bed pressure by horizontal extracting wells. Within deposit bed pressure is higher than firsthand pressure. Pumping of gas is performed with pit pressure of force wells equal to or higher than pressure needed for mixing of gas and oil, but lower than pressure needed for hydraulic disruption of beds. Pit pressure of extracting wells is kept equal to or greater than pressure needed for saturation of oil with gas.

EFFECT: higher oil yield.

2 cl, 1 ex