DEVELOPMENT METHOD OF DEPOSIT OF HIGH-VISCOSITY OIL OR BITUMEN Russian patent published in 2015 - IPC E21B43/24 E21B43/22 

FIELD: oil and gas industry.

SUBSTANCE: in a development method for a deposit of high-viscosity oil or bitumen including construction of the upper injector and the lower producer with horizontal sections placed one over the other the above sections are equipped with filters, at that a pipe string of a pipe-in-pipe type with inner spaces isolated from each other by packers is run down to the injector while output openings of the pipe strings are placed in the filter and spread along the length of the horizontal section dividing it into heating zones, injection of a heat carrier through the horizontal injector with the stratum heating, creation of a steam chamber and extraction of the product through the horizontal producer, at that thermograms of the steam chambers are recorded, the heating state is analyzed regarding the evenness of heating and availability of temperature peaks, considering the obtained thermograms even heating of the steam chamber is made by changing the heating zones and delivery of a required quantity of the heat carrier to the respective pipe string in order to exclude the breakthrough of the heat carrier to the producer through the most heated zone, at construction of the injector with a horizontal section for evener heating of the stratum the filters and pipe strings are made with an increased total cross-section area of the openings from the beginning of the horizontal section in the stratum towards the bottomhole. During operation upon a 3-5 time increase in viscosity of the extracted product injection of the heat carrier to the injector is stopped and a gaseous hydrocarbon solvent is injected through the respective pipe string to the heating zone with the least temperature until the temperature of the extracted product is reduced per 10-25%. Thereafter injection cycles of vapour and gaseous hydrocarbon solution to the respective heating zones and product extraction are repeated.

EFFECT: enabling continuous control over the change in viscosity of the extracted product, potential regulation of the injection process, even heating of the stratum, increased output of high-viscosity oil and bitumen with the simultaneous reduction of material costs and energy consumption.

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