METHOD OF EXTRACTION OF HEAVY AND HIGH VISCOUS HYDROCARBONS FROM UNDEGROUND DEPOSITS Russian patent published in 2008 - IPC E21B43/24 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to method of extraction of tar sand or of heavy oil with high viscosity from underground deposit. The essence of the invention is as follows: the method includes boring and preparing to operation with installation of case columns of pressure wells with horizontal end sections and producing wells with horizontal end sections in the deposit below the level of the pressure well for extraction of hydrocarbons; then formation of a permeable zone between the pressure and producing wells. According to the invention boring of pressure and producing wells is carried out on base of one of the aerial systems with a distance of not less, than five meters between them. Each case column lowered before forming of end sections of pressure and producing wells is opened along the whole perimeter at direct proximity from a bottomhole with a distance for height not less, than five meters between opened sections of pressure and producing wells. Further, a deflector with outgoing valves directed into an opened section is lowered into each well before interaction with the bottomhole. A required number of horizontal end sections of a well, each equipped with filters connected to each other with flexible links is arranged successively through each opened section of the cased column; the said filters consist of links connected between themselves with flexible components insulating the space between inputs of the horizontal sections and an upper link of filters. After lowering of thermo-insulated tube column in each well above the opened section there is installed a packer, insulating annular space between the cased column and thermo-insulated tube column to exclude thermal influence onto the well above the packer.

EFFECT: facilitating increased efficiency of underground deposit development and extension of service life of well till capital repair.

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