FIELD: oil-and-gas industry.
SUBSTANCE: proposed method comprises feed of extracted product via tuning to well mouth and, further, to gas-fluid separator to device said product in gas and liquid phases. Gas and fluid phases are discharged from gas-fluid separator via gas and fluid lines. Oil gas amount is measured in gas line while fluid amount is measured in fluid line. Gas chemical composition is defined as well as its components mass and/or molar fractions to calculate its molar weight. Cavity formed by casing inner surface and tubing outer surface from well mouth to well fluid dynamic level is used as a gas separator. Portion of gas is accumulated in said cavity to create gas pressure to discharge it via gas pipe into gas line and/or oil-and-gas pipeline. Oil gas amount and/or gas temperature and pressure are measured in gas branch pipe. Residual oil gas amount is measured in fluid line as well dissolved gas amount.
EFFECT: in-situ determination of oil yield.
1 dwg, 3 cl
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