METHOD FOR DEVELOPING SUPER-VISCOUS OIL RESERVOIR WITH CLAY BRIDGE Russian patent published in 2019 - IPC E21B43/24 E21B7/04 E21B43/267 

FIELD: oil industry.

SUBSTANCE: method of developing deposits of super-viscous oil with a clay bridge includes drilling in the reservoir a steam injection well and located below the horizontal production well, horizontal wells with a length L of the production and injection wells are placed in parallel in a vertical plane and at an angle of not more than 15° in the horizontal plane. In the absence of a hydrodynamic connection between the producing and injection wells, 1 or 2 vertical wells are drilled during steam injection for no more than 12 months, which are placed in a vertical plane at a distance (0.3–0.7)⋅L from the toe of the horizontal boreholes, and in the horizontal plane at a distance of not more than 0.2⋅L from horizontal boreholes. Research is conducted and the presence of a clay lintel, preventing the specified hydrodynamic connection, is determined. In these vertical wells, samples of rocks, including clays, are taken from the productive part, geomechanical studies are carried out, according to the results of which an optimal design, working fluids and a proppant for fracturing a clay web are selected. Fracturing of the clay bridge is carried out in such a way as to create both horizontal and vertical cracks. Vertical wells are mastered by steam injection for 1–6 months. Subsequently, these vertical wells are used to control and regulate the development of a section of the reservoir between the horizontal wells of the production and injection wells, as well as to supply chemical reagents in order to increase oil recovery and/or block irrigated areas of the reservoir.

EFFECT: technical result is an increase in oil recovery from a super-viscous oil reservoir, an increase in the coverage ratio of a heterogeneous section of a reservoir due to the destruction of a clay bridge.

1 cl, 1 dwg, 2 ex