METHOD OF FURTHER DEVELOPMENT OF HIGH-VISCOSITY OIL DEPOSIT Russian patent published in 2003 - IPC

FIELD: secondary methods of production of high-viscosity oils and native bitumens, particularly, methods of heat stimulation of formations. SUBSTANCE: method includes drilling of horizontal and vertical wells from surface. Horizontal wells intersect bottoms of tiers of old underground wells, or they are drilled neat it. Vertical wells are drilled on area earlier developed by mine method from underground galleries by gently sloping wells to region of bottoms of horizontal wells. At the first stage, heat carrier is injected by cycles through horizontal wells. After establishment of hydrodynamic connection between horizontal wells, oil is displaced with steam or with concurrently introduced water. Oil is withdrawn from vertical wells. In event of wells sanding, they are flushed by horizontal well plus vertical well system. EFFECT: increased rate of development of deposits earlier operated by mine method on natural depletion drive. 3 dwg, 1 ex