DEVELOPMENT METHOD OF DEPOSITS OF HIGH-VISCOSITY OILS AND BITUMENS Russian patent published in 2015 - IPC E21B43/26 E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: method involves formation of pressure drops between a bottom-hole zone and a well cavity by creation of periodic pressure pulses in the bottom-hole zone in the form of a liquid mass movement wave moving via the well cavity. First, time of movement of liquid mass movement wave from the wellhead to the bottom-hole zone and duration of formation fractures expansion and closing is evaluated. A liquid re-filling valve is opened for the time during which a liquid mass movement wave reaches the bottom-hole zone and acts on fractures of the formation. Then, the liquid re-filling valve is closed and a liquid drain valve is opened to reduce pressure in the well to the initial pressure value. Operations of periodic pressure pulses in the bottom-hole zone are combined with operations of thermal cyclic treatment of the well by alternation of a series of pressure pulses with number, amplitude and duration of pulses in a series, which are determined by physical parameters of an oil deposit, and further pumping of a heat carrier to the well with its squeezing into the formation fractures formed at performance of a series of pressure pulses.

EFFECT: improving efficiency of complex well treatment.