METHOD FOR DETERMINING VOLUMETRIC ACTIVITY OF TRITIUM IN COMBUSTIBLE NATURAL GAS OR ASSOCIATED OIL GAS OF WELLS OF OIL AND GAS DEPOSITS Russian patent published in 2019 - IPC G01T1/167 

FIELD: monitoring systems.

SUBSTANCE: invention relates to radiation monitoring of areas of peaceful underground nuclear explosions within oil-and-gas-bearing basins, particularly to obtaining quantitative data on volumetric activity of tritium. Method for determining volume activity of tritium in combustible natural gas or associated petroleum gas of wells of oil and gas deposits includes determining volumetric activity of tritium by liquid scintillation spectrometry in a water vapor condensate obtained by combusting a sample of combustible gas in field conditions in a portable apparatus which provides excess atmospheric oxygen owing to unimpeded access of surface air for burning gas at atmospheric pressure and obtaining a condensate of water vapor – a product of burning hydrocarbons , wherein when determining volumetric activity of tritium, component composition of combusted gas, which is determined by gas chromatography, is taken into account, stoichiometry of gas burning reaction with excess oxygen under normal conditions and contribution of atmospheric moisture captured during gas combustion in portable plant, depending on temperature and relative humidity of surface air and volumetric activity of tritium in atmospheric moisture determined by sample collected on cryogenic trap before combustion of sample gas, and volumetric activity of tritium in combustible gas is calculated by formula: A_N=0.804⋅A_B⋅(C_H2O/C_RH), where A_N is volumetric activity of tritium in combustible natural gas or associated petroleum gas (Bq/m³ gas); 0.804 is coefficient corresponding to stoichiometry of conversion of hydrocarbon into water as a result of combustion reaction at excess of atmospheric oxygen under normal conditions; C_H2O – sum of mole fraction of water appearing at burning according to stoichiometry of combustion reaction of gas sample of certain component composition, with corresponding stoichiometric coefficients (mol); C_RH is the sum of molar fractions of hydrocarbons of gas components (mol); A_B is volumetric activity of tritium in condensate of water vapor – product of hydrocarbon burning (Bq/kg of liquid).

EFFECT: obtaining quantitative data on volume activity of tritium in gas under normal conditions.

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