METHOD FOR DEVELOPING A LAYERED-ZONAL-HETEROGENEOUS DEPOSIT OF EXTRA-VISCOUS OIL OR BITUMEN WITH THE PRESENCE OF AN IMPERMEABLE INTERLAYER Russian patent published in 2022 - IPC E21B43/24 E21B43/14 

FIELD: oil industry.

SUBSTANCE: invention relates to the oil industry and can be used in the development of layered-zonal-heterogeneous deposits of high-viscosity and bituminous oil with the presence of an impermeable interlayer. To implement the method for developing a layered-zonal-heterogeneous deposit of extra-viscous oil or bitumen with the presence of an impermeable interlayer, horizontal wells are drilled, horizontal sections are made in the form of a sinusoid with the intersection of all layers in a multi-layer layer-heterogeneous reservoir and fluid is taken from the multi-layer layer-heterogeneous reservoir. Viscosity of extra-viscous oil or bitumen is preliminarily determined in reservoir conditions, horizontal wells are performed in the form of ascending subhorizontal steam-cyclic wells. The direction of drilling is chosen in such a way that the horizontal sections of the wells in the form of a sinusoid ascending cross the impermeable interlayer with the formation of sinusoidal steps. The average level of each subsequent sinusoidal stage is performed at an absolute mark above the average level of the previous sinusoidal stage by at least 1 m. The distance between the average levels of two adjacent stages is kept 150-250 m. more than 500 mPa*s in reservoir conditions, steam is injected, heating of super-viscous oil or bitumen, after heating, liquid is withdrawn, at a viscosity of less than 500 mPa*s, liquid is withdrawn in reservoir conditions by a mechanized method.

EFFECT: increasing the efficiency of developing a layered-zonal-heterogeneous deposit of extra-viscous oil or bitumen, increasing the oil recovery factor, reducing the likelihood of a water seal in the lower intervals of wells.

1 cl, 1 dwg