METHOD OF DEVELOPMENT OF GAS-AND-OIL RESERVOIRS Russian patent published in 2015 - IPC E21B43/16 

FIELD: oil and gas industry.

SUBSTANCE: method involves the use of horizontal holes, the horizontal section of which passes through the oil formation at the minimum distance from the gas cap 1/2 thickness of the oil part. The branch with sealing of annular space directed upwards is formed, with crossing of gas-oil contact and opening of gas saturated part of the formation. Meanwhile the string is perforated with opening of the gas cap in two opposite sections of the well within the target formation. Control of flows of gaseous and liquid fluids in the well between various perforation intervals is performed using the bypasses adjustable from the surface. The well design according to the method allows to perform independent gas recovery in required volumes from two intervals of gas cap opening, that allows independently to monitor the movement of the gas-oil contact and lift the formation fluid to the surface at the expense of natural gas-lift.

EFFECT: increase of level of development of oil stocks by means of control of intraformational cross-flows of gaseous fluid and minimizing of risks of coning, decrease of expenses for lifting of formation fluids to the surface at the expense of natural gas-lift.

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