DEVELOPMENT METHOD OF HIGH-VISCOSITY OIL DEPOSIT USING METHOD OF THERMAL STEAM ACTION ON FORMATION Russian patent published in 2012 - IPC E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: development method of high-viscosity oil deposit using the method of thermal steam action on formation with horizontal production wells involves drilling of horizontal production wells with filtered (perforated) zone above bottom of formation and injection wells located in staggered order on both sides of each corresponding horizontal well, pumping of heat carrier through injection well and product extraction through production wells. Injection wells are drilled vertically at the distance of 60-80 m from horizontal well with a pitch of 100-200 m; at that, injection well which is the closest one to the head of production well is arranged at the distance of 50-60 m from the beginning of filtered zone of horizontal well. Horizontal paired perforated sections 100-150 m long are drilled at an angle of 45°-70° from each injection well using the radial drilling method so that horizontal sections of injection wells are located above horizontal production well at the distance of 5-10 m. Prior to product extraction from production well to all wells there performed is pumping of heat carrier in the volume of 3-5 t/m of total length of perforated sections and zone. After horizontal well is changed over for constant product extraction prior to change-over of all vertical wells for constant injection of heat carrier, vertical wells are changed over in turn for cyclic steam pumping and product extraction until temperature is equalised throughout the length of production well.

EFFECT: increasing the efficiency of thermal steam action on formation; maintaining high oil flow rate in conditions of non-homogeneous formation, increasing oil extraction coefficient at minimisation of well drilling costs.

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