DEVELOPMENT METHOD OF SHALE DEPOSITS Russian patent published in 2015 - IPC E21B43/243 

FIELD: oil and gas industry.

SUBSTANCE: method consists in separation of the developed ore field into blocks isolated from each other in pillars. In the central part of each block along the bottom of the deposit there arranged are two horizontal wells as mine chambers, in which there installed with provision of an air gap is an explosive charge of alternating non-sealed containers loaded with an explosive and hollow ones dividing the charge into separate parts, which are all fixed at the well head on a rope. Containers are provided throughout the length of the charging composition with main detonating cables connected to each other at the well head, and with electric detonators with closed conductors. The working end of the containers filled with explosives is provided with a charge hollow. The second end is plugged. In order to reduce seismic action of explosion, the above containers are provided with detonators of short-delay blasting, which are mounted in a section of the detonating cable located in the inner cavity of the container. With that, an offset of one of the above detonators is connected to the main line of the detonating cable. An offset of the second detonator is connected to a backup line. Vertical production wells are arranged along the circuit of module units and provided with Khobot-Tornado vortex pumps with flow-airlift pipes providing operation of the pump. Development of the deposit is performed as per a three-stage modular circuit by series transition into neighbouring blocks isolated with pillars. At the first stage, mine formation fracturing is performed with further extraction of gas and gas condensate by means of production wells. At the second stage, heat treatment of fractured formations is performed by supplying under pressure of at least 2.0 MPa of high-temperature combustion products through vertical parts of horizontal wells into the bottom part of the formation with further removal of molten solid and viscous organic component parts. At the third stage, through vertical part of the horizontal wells there pumped to the cavity of the formation is an alkali solution to leach ash shale formations for extraction of rare-earth component parts.

EFFECT: improving development efficiency of shale deposits in areas with developed infrastructure of metropolitan cities due to improvement of environmental safety and economical effectiveness.

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