FIELD: oil and gas production industry. SUBSTANCE: this can be used for assessing condition of reservoirs of well down-hole zone bed at stage of prospecting and operating drilling of wells. According to method, hydrodynamic investigations of well is performed according to curve of pressure change in well after its stoppage with subsequent processing of investigation results in compliance with idea of infinite and finishing reservoirs and comparing calculated data produced in both types of investigation. In results, determined is sought-for relation of actual and potential coefficients of well production output. This gives reason to judge condition of well down-hole zone and its changing in process of operation. EFFECT: high efficiency. 2 cl, 2 dwg
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