FIELD: oil production. SUBSTANCE: method provides for measurement of tension force of cable connected to buoy of cylindrical shape submerged into reservoir with water-and-oil emulsion. Measurements are taken with lifting of buoy from bottom of reservoir with stops and space lesser than half-length of buoy. Values of tension force of cable are recorded at moments of stops. Then dependence of tension force of cable on height is plotted by which density and water content of oil over height of reservoir are established. EFFECT: simplified with reliable results. 1 dwg
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