METHOD OF DEVELOPMENT FOR ULTRAVISCOUS OIL DEPOSITS WITH THERMAL INFLUENCE Russian patent published in 2013 - IPC E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: method of development for ultraviscous oil deposits with thermal influence involves drilling of horizontal injection and recovery wells one below the other, at that horizontal injection well is located higher than horizontal injection recovery well, and also rows of vertical injection and recovery wells; pumping of heat carrier into injection wells and production of ultraviscous oil from recovery wells. The row of vertical injection wells is drilled over the horizontal injection well till they are crossed with it. Recovery wells are inclined and located in two rows at different sides from horizontal wells; they are drilled till crossing with horizontal recovery well. Then hydraulic fracturing is made from the horizontal injection well opposite each vertical injection well with formation of hydrodynamic links. In similar way hydraulic fracturing of stratum is made from the horizontal recovery well opposite each inclined recovery well with formation of hydrodynamic links. Heat carrier is pumped into the horizontal injection well and vertical injection wells and recovery of ultraviscous oil is made through the horizontal recovery well and inclined recovery wells till drowning of the horizontal recovery well; whereupon bores of the inclined recovery wells are isolated from hydrodynamic link with the horizontal recovery well and the horizontal recovery well is converted into an inspection well. Further pumping of heat carrier is made in turn to injection wells and to the horizontal injection well while recovery of ultraviscous oil is made from inclined recovery wells till bores of the inclined recovery wells are drowned from the horizontal injection well. Whereupon pumping of heat carrier to the horizontal injection well is stopped and this well is converted into a process well; further heat carrier pumping is made only to the vertical injection wells while recovery is continued from the inclined recovery wells; at that water is pumped periodically into the process well in order to decrease temperature till the permitted value within the area of potential breakthrough of heat carrier to the inclined recovery wells.

EFFECT: additional involvement into deposit development of areas with ultraviscous oil with layer inhomogenity which are located directly over horizontal wells with controllability of temperature of ultraviscous oil soaking and decrease of this temperature; prevention of heat carrier breakthrough to bores of recovery wells in process of the deposit development; prevention of necessity to convert injection wells into recovery wells and vice a versa thus reducing financial expenses of the method implementation.

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