METHOD FOR PREDICTING CHANGE OF FRACTION COMPOSITION OF BED GAS CONDENSATE IN PROCESS OF GAS-CONDENSATE DEPOSIT EXTRACTION Russian patent published in 2005 - IPC

FIELD: oil and gas industry.

SUBSTANCE: method includes extraction of separation gas sample and raw condensate from pVT bomb and research separator, research of condensate fraction composition of bed gas and prediction of change of condensate fraction composition by means of graphic dependencies. Additionally, mass fraction composition of degassed condensate is determined, which condensate is taken from pVT plant bomb and research separator during industrial research by extracting and researching micro-probes of condensate by gas-chromatic-graphic method with decrease of pressure in pVT plant bomb. After that by means of analytical dependencies amount of condensate is predicted for saturated and non-saturated deposits. After determining predicted values of amount of condensate for non-saturated and saturated deposits their values are defined more precisely using correction coefficients. Then by means of calculations amount of I fraction in composition of degassed separator condensate is determined. On basis of data from determining of mass fraction composition amount of I fraction in composition of all bed condensate is determined from starting conditions, and bed losses for each fraction are also determined. On basis of data concerning containment of each fraction of bed condensate in bed gas for starting conditions and data concerning bed losses of these fractions during extraction prediction dependencies for amount of condensate fraction in bed gas are determined during extraction process on basis of given mathematical dependencies. Then their values are defined more precisely by means of correction coefficients, determined by division of dry gas volumes in pVT plant bomb in gaseous and liquid phases, on volume of dry gas in gaseous phase and considering dissolution of bed gas in condensed raw condensate and determined on basis of experimental research. Then condensate fraction composition is calculated by division of value of amount of each condensate fraction on value of amount of all condensate.

EFFECT: higher precision.

6 dwg, 6 tbl, 1 ex