METHOD FOR SHALE GAS PRODUCTION Russian patent published in 2014 - IPC E21B43/00 

FIELD: oil and gas industry.

SUBSTANCE: method includes construction of main well, the shaft of which has vertical and horizontal areas, the latter of which is located in productive shale bed, and stimulation of gas inflow to shaft horizontal part with the help of hydraulic fracturing of productive shale bed along its length. According to invention the gas production is done in the following process sequence: from vertical shaft of the main well there drilled are several side horizontal shafts round it, the shafts are space-oriented, including azimuthal plane located between the roof and bottom of shale productive bed. At each face end of side horizontal shafts there drilled is a subsidiary vertical well and it is connected to side horizontal well via hydraulic fracturing. Only pure water is used as working fluid for hydraulic fracturing. Gas inflow stimulation in side horizontal shafts is done by different methods. Note that for stimulation method efficiency evaluation there performed is a hydro-dynamic survey of each side horizontal shaft drainage capacity before and after the implementation of the proper method of gas inflow stimulation.

EFFECT: creation of large section headers in gas-shale deposit with well-developed fracture pattern at side surface of drilling channel as well as in the form of areal cracks in gas-shale deposit massive.

6 cl, 1 ex, 1 dwg