METHOD OF DEVELOPMENT OF HIGH VISCOUS OIL DEPOSIT Russian patent published in 2009 - IPC E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to methods of development of oil deposits including thermal effect to reservoir containing high viscous oil. The invention ensures upgraded efficiency of oil extraction by means of increased thermal coverage of a reservoir due to formation of phased step-by step impermeable zones at bottom holes of pressure wells for successive development of the whole thickness of a bed. According to the method a producing well is bored to the bottom of a producing bed, while each horizontal pressure well is bored from the periphery of the place at a descending angle in the direction of the bottom of the bed to the producing well till formation of a direct hydraulic communication between the wells. Steam is pumped into the pressure wells and oil is withdrawn from the producing wells. After steam outbreak into the producing well an insulating filling material is pumped into the pressure well which is the source of steam outbreak; the insulating material is, for example, clay solution which is capable to form impermeable zone at the well bottom hole. Pumping of the insulating filling material is carried out till formation of the primary pressure of steam pumping, while pumping cycle of insulating filling material pumping into the pressure well is performed after each outbreak of steam into the producing well. Forming of the direct hydraulic communication between the pressure and producing wells is evidenced when the static level of liquid in the producing well increases.

EFFECT: increased efficiency of oil extraction.

9 cl, 1 ex, 13 dwg