PROCEDURE FOR EXTRACTION OF HIGH VISCOUS OIL AND BITUMEN WITH APPLICATION OF HORIZONTAL PRODUCING AND HORIZONTAL-INCLINED WELLS Russian patent published in 2011 - IPC E21B43/24 

FIELD: oil and gas production.

SUBSTANCE: according to procedure there are used pairs of horizontal-inclined pressure and horizontal producing wells. A bottom-hole of the horizontal-inclined pressure well is directed closer to a bore of the horizontal producing well in vertical plane of a payout reservoir at distance not less, than 5 metres to facilitate more efficient collector heating in a region of the producing well. When heat carrier is being pumped and production is being withdrawn there is performed control of temperature of extracted production of the well and its yield from the producing well. At each drop of yield or when temperature of reservoir production reaches 80-90% of heat carrier temperature of outbreak from the pressure well to the producing well, the bottomhole of the pressure well is successively insulated at a step of 7-15 metres, where upon wells are operated under a normal mode. According to the invention steam of 180°C temperature and dryness 0.8 d. units is supplied via the horizontal inclined well. The payout reservoir is heated starting from pumping steam only into the horizontal-inclined well. Further, an inter-well zone of the reservoir is heated which decreases viscosity of high viscous reservoir oil. There is created a steam chamber by means of pumping steam spreading above the producing horizontal well. The bottomhole of the horizontal inclined well should strike the zone with the highest water saturation and penetrability to obtain the highest time indices of heating.

EFFECT: raised efficiency of deposit development due to increased horizontal sweep with heat influence; raised quality of control over uniformity of steam chamber heating by regulation of pressure well perforation and over withdrawal of production.

4 dwg, 1 tbl