THREE-ROW THERMAL WELL HIGH-VISCOSITY OIL DEPOSIT DEVELOPMENT METHOD Russian patent published in 2016 - IPC E21B43/24 

FIELD: oil industry.

SUBSTANCE: invention relates to oil industry, in particular, to thermal-mine methods of development of high viscous oils and natural bitumens. Triserial method of oil deposit thermal-mine development involves extraction of oil from flat-rising production wells drilled in oil formation mine working or below it, pumping of steam into injection wells drilled from the surface and forming a system of stratum heating which includes steam distributing wells directed towards the formation super-face, and additional production wells directed towards the middle part of the formation, drilled in mine working and located in a zone of injection well influence. Method presupposes drilling of three sequentially located production wells with equally spaced from each other mouths and equidistant from each other faces constituting a triserial oil bleed system and having one or several tiers depending on the oil bed thickness and average number of permeable intervals in the section. Heating system wells are drilled between every three rows of oil extraction system, at that, heating system injection wells are drilled trough the whole thickness of the formation under the condition of absence of oil-water contact. In the case of oil-water contact presence, the working face shall be located above the oil-water contact. Additional production well of the heating system is located above the lower tier of oil extraction system production wells. After breakthrough of steam into outer rows of triserial oil extraction system production wells, the wells are closed or transferred to periodic operation while maintaining the rate of steam injection into the injection wells, and, after breakthrough of steam into the internal row of triserial oil extraction system production wells, the wells are transferred to periodic operation and the rate of steam pumping into the injection wells, where the steam breakthrough took place, is decreased.

EFFECT: technical result consists in ensuring high rate of oil extraction due to more intensive pumping of a heat carrier with simultaneous reduction of costs for deposit development.

1 cl, 2 dwg