METHOD OF OIL FIELD DEVELOPMENT BY HORIZONTAL AND VERTICAL WELL SYSTEM USING THERMAL IMPACT Russian patent published in 2015 - IPC E21B43/243 

FIELD: oil and gas industry.

SUBSTANCE: method of oil field development by a horizontal and vertical well system using thermal impact involves horizontal and vertical well drilling and equipment, so that vertical well bottom is located below horizontal well bottom at a design vertical distance of 3 to 7 m, formation of heating area by injection of combustible oxidising mixture (COM) and combustion initiator (CI) to ignite and warm-up the inter-well zone up to 100-200°C, depending on COM and CI type, and to establish hydrodynamic connection between wells; horizontal well is switched to liquid production by a pump, with continued supply of COM and CI to the vertical well to maintain burning and warming-up of the field to 250-350°C which is the temperature of independent burning of COM; afterwards, CI supply is stopped, and COM injection continues to maintain and promote burning along the horizontal wellbore. During construction, horizontal well is equipped with a filter with several zones along the horizontal section length. Before pump landing in the horizontal well, a liner with thermocouples installed inside it for temperature monitoring inside the well opposite to filter zones, that allows for serial opening of only one zone during turning and for shutting filter zones from bottomhole to wellhead. Zone adjoining the bottomhole is opened initially. After combustion initiation, if temperature in this zone falls down from the maximum achievable by combustion in the field conditions to 85-95°C, product pumping is stopped, the liner is turned from wellhead to a definite angle ensuring bottomhole zone shutoff and opening of the next zone used for further product extraction by pumping. After temperature in this zone changes from the maximum achievable by combustion in the field conditions to 85-95°C, this zone is closed by a turn of the liner opening the next zone from the bottomhole, and similarly zones are opened and shut in sequence till the last filter zone from the bottomhole.

EFFECT: optimised operation of horizontal well, reduced power cost of its operation, expanded effective coverage of horizontal producer effect, reduced content of gas in the product extracted, enhanced depletion of oil field stock.

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