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Hydraulic fracturing operations performed at the stage of gas prospecting in shale formations are aimed at opening out gas residing in rock micropores. Large quantities of fracturing fl uid, with physicochemical composition adjusted to their properties, are injected to the selected interval of a horizontal well. Finally, sand (proppant) is injected along with the fracturing fl uid to support the newly formed fracture. In the industrial practice, 10 to 15 stages are performed in a horizontal well section 1,000 m to 2,000 m long. The produced fracture generates propagation up to 300 m [2, 5]. Hydraulic fracturing operations involve specialist sets of devices powered by high-pressure motors totaling to a dozen to tens of thousands kW. The duration of a hydraulic fracturing operations is 2 hrs to 4 hrs, depending on the quantity of the injected fracturing fl uid [3]. On average, a few such operations can be performed during a day period. The most important environmental hazards which may accompany properly conducted fracturing of shale rock are mainly connected with noise emission from motors powering technological subassembies, aggregates and atmospheric pollution [1, 3]. Most of these works are usually conducted in areas where the noise standards are not applicable. However, in some localizations the operations are conducted close to farmsteads and residences, where the respective environmental standards have to be met. According to Polish law, the acceptable noise levels measured on the level of windows in residential objects, equals to LAeq = 55 dB in the day time, and LAeq = 45 dB in the night hours [10]. When the noise level is exceeded, sound berms have to be applied. For the sake of evaluating the impact of the hydraulic fracturing of rocks on acoustic conditions in their area, noise propagation should be mathematically modeled. This calculation method is based on the Regulation of the Environment Minister of 30 October 2014

Methodics of assessing environmental noise emission while performing hydraulic fracturing operations in shale formations