METHOD OF MINING-WELL TAR PRODUCTION AND PROCESS EQUIPMENT SYSTEM FOR ITS IMPLEMENTATION Russian patent published in 2016 - IPC E21B43/16 E21B43/24 E21B43/26 

FIELD: oil and gas industry.

SUBSTANCE: method includes general mine works relating to opening of an oil- and gas-bearing shale deposit by shafts and underground development working, a well with horizontal sections, located between the roof and bottom of the productive shale deposit, operations relating to the well production of tar using the formation hydraulic fracturing and stimulation of the formation fluid influx to the wells by physical and chemical actions on the productive deposit. The hydraulic fracturing and influx stimulation of the well product are performed via well-blastholes of a small diameter. These wells are drilled through the deposit from the underground development workings. The production wells product is separated under underground conditions in the shaft inset to tar and shale gas. The shale gas is separated to dry stripped gas and a wide fraction of light hydrocarbons. The dry stripped gas containing mainly methane gas is supplied via the shaft gas line to the surface, and is used to generate electric and thermal energy, and for export to external consumers. The wide fraction of hydrocarbons, containing mainly a propane-butane component - mixture, is liquefied under underground conditions, and injected via the wells-blastholes of a small diameter to the production deposit during the hydraulic fracture and to maintain the formation pressure. The hydraulic fracture of the productive deposit is performed also from the wells-blastholes of a small diameter by injection to the zone of the hydraulic fracture of liquefied methane or liquid nitrogen, supplied via the cryogenic shaft pipeline from the surface.

EFFECT: simplified operations of the hydraulic fracture of the deposit, and assurance of possibilities of their combination in time with the process of oil production, and execution of measures relating to oil recovery increasing in the same drainage system.

2 cl, 5 ex, 6 dwg