FIELD: oil producing industry; applicable in taking samples for determination of gas factor and production rate of wells. SUBSTANCE: created in zone of sampling are conditions for critical flowing of main flow and samples are taken from this zone with critical velocity of flowing of sampled flow. Critical conditions of flowing are created by installation of calibrated unions in the way of flows and taking sample into sampling tube from zone of critical effluent of main flow. EFFECT: higher efficiency. 4 cl, 4 dwg
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