METHOD AND DEVICE FOR ALIGNMENT OF STEAM ASSISTED GRAVITY DRAINAGE WITH VIBRATION-WAVE EFFECT ON PRODUCTIVE FORMATION IN HORIZONTAL WELLS Russian patent published in 2017 - IPC E21B43/24 E21B43/25 E21B28/00 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to oil industry and can be used for increasing oil recovery of productive formations in development of deposits of high-viscosity oil and industrial bitumen using steam assisted gravity drainage. Method of combining steam assisted gravity drainage with vibration-wave effect on productive formation in horizontal well conditions, which comprises laying in an interval of productive formation a pair of two-head horizontal wells, one above other, each consisting of two vertical shafts interconnected by horizontal section and including casing, laid from one head to other and perforated within horizontal section. Furthermore, wells comprise two oil-well tubing (OWT), laid inside casing pipe within vertical shafts and ending with shanks in beginning of horizontal section of well, before perforated section of casing pipe. Upper well is injection well and serves for feeding steam into productive formation, and lower well is a producer well and serves for pumping product. Horizontal section of casing pipe is insulated on both sides by packers installed on ends of OWT. Injection well is mounted on both ends with OWT, immediately behind packers, flow generators of pressure fluctuations, front surface to each other. Volume half-wave resonator is formed from horizontal section of casing pipe, enclosed between flow generators. Steam is pumped into injection well via OWT and all steam is pumped via flow generators. Pressure fluctuations are generated in steam flow. Frequency of generating pressure for steam supply via each OWT is controlled separately. System of waves travelling towards each other is generated in volume resonator. Pressure fluctuations are directed to productive formation through perforations in casing.

EFFECT: technical result is intensification filtration of formation fluid in pore channels due to formation of pressure oscillations of certain frequency in formation interval with developed liquid communication when pumping steam via oil-well tubing into injection well.

4 cl, 4 dwg