METHOD OF DEVELOPMENT OF OIL-AND-GAS DEPOSITS WITH BOTTOM WATER Russian patent published in 2014 - IPC E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: method of development of oil-and-gas deposits with bottom water includes primary gas cap blowdown by gas wells and withdrawal of at least part of gas with subsequent joint development of gas cap and oil rim by opening-up of last with producing and injection wells, injection of displacement agent into the oil part of the deposit and oil withdrawal. According to the invention, at the beginning of gas withdrawal from the gas cap, withdrawal and pass-by of bottom water into the gas cap are performed. Bottom water is moved along the gas and oil contact and a barrier is created on the gas and oil contact in order to reduce oil cross-flow into the gas cap and embed bottom water in the oil part of the deposit. At that, volumes of gas withdrawal and pass-by water are controlled making sure that gas and oil contact is kept almost immovable.

EFFECT: increased efficiency of development of oil-and-gas deposits with bottom water due to more rational utilisation of energy of bottom water and higher gas and oil recovery of formation.

6 cl, 3 ex, 1 tbl, 3 dwg