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Hydraulic fracturing connected with the development of drilling technologies, espe‐ cially horizontal drilling technology, enabled economically justifiable production of natural gas from unconventional sources. It should be also stressed that hydraulic procedures are a standard part of drilling for hydrocarbons from unconventional sources. In fact natural gas extraction from conventional or unconventional sources does not differ much. The most important and environmentally controversial difference is the quantity of used water and fracturing procedures as well as the amount of flowback water from hydraulic fracturing. In conventional reservoirs the amount of water needed for fracturing is about 200 m3, whereas in the case of shale deposits the required quantity oscillated between about 1,500 m3 and 2,000 m3, and even dozen thousand cubic meters of water.

An analysis of fluids after hydraulic fracturing in the aspect of their further use or neutralization