METHOD FOR OIL PRODUCTION BY UNDERGROUND HORIZONTAL WELLS Russian patent published in 2009 - IPC E21B43/24 E21D7/00 

FIELD: oil and gas industry.

SUBSTANCE: invention is related to oil and gas industry in production of high viscosity oils and bitumens, and also in secondary production from drown-out beds by thermal action at bed. Vertical shaft is drilled from day surface. Payout bed is opened for its entire capacity. Its walls are fixed. Underground working chamber is erected in the form of conductor horizontal pipes symmetrically installed relative to axis, which are pressed by jack into payout bed, along directions of horizontal wells. After internal cavity of conductor pipes are freed from payout bed rock, double level horizontal pressure and production wells are constructed by pressing of tubular filters into payout bed by means of telescopic jack arranged with the possibility of installation in oppositely located conductor pipes to increase working travel. Double level wellheads are located in working chamber. Coolant supplied from day surface along steam line is pumped into payout bed via pressure wells. Oil is extracted from payout bed by production wells into underground working chamber, collected in reservoir on shaft bottom and pumped to day surface.

EFFECT: lower cost of well construction, more efficient extraction of bed products due to maximum coverage of payout bed area around shaft by horizontal wells.

5 cl, 2 dwg