METHOD FOR DEVELOPMENT OF DEPOSITS OF HIGH-VISCOSITY OIL OR NATURAL BITUMEN Russian patent published in 2017 - IPC E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil industry. Method for development of deposit of high-viscosity oil or natural bitumens involves drilling from surface of earth horizontal and vertical wells on area of developed section, pumping heat carrier into well and collecting fluid. Horizontal wells are drilled from side of boundaries of oil bearing developed deposit in direction of area of adjacent section, spent or in final stage of development, for example, at thermal well technology. Horizontal boreholes are drilled gently sloping in range of oil formation and well bottoms are connected with inner space of drilling galleries, located in lower part of oil formation. Method comprises thermometry of formation for each gently sloping shaft of horizontal well. Results thereof are used to determine on area of developed section a line of oil flow point in reservoir under gravity. Area of developed section is divided into two zones: internal heated zone, confined by contour of section, spent or in final stage of development, and a line of oil flow point, and outer unheated zone confined by line of oil flow point and line corresponding to "heels" of horizontal wells. In each gap between gently sloping bores of horizontal wells in external unheated zone, method includes drilling, from ground surface, at least one vertical injection well and placing it on line of oil flow point. Method includes determining injectability of each vertical well by pumping heat carrier into each well and identifying wells without injectability. Method comprises heating wells without injectability by circulating heat carrier in well until achieving average injectability on section and simultaneously constantly pumping heat carrier in all vertical and horizontal wells. Heat carrier pressure at mouths of vertical wells is provided above heat carrier pressure on mouths of horizontal wells and fluid is simultaneously extracted through faces of horizontal wells located in cavity of drilling galleries, controlling temperature of extracted liquid on faces of horizontal wells, maintaining it at level of 90 °C by controlling flow of heat carrier in vertical and horizontal wells, maintaining pressure difference on mouths of horizontal and vertical wells, and operating section to planned oil recovery factor.

EFFECT: higher efficiency of deposit development.

1 cl, 6 dwg, 1 ex