METHOD AND DEVICE FOR DETERMINATION OF OIL-DISSOLVED GAS Russian patent published in 2015 - IPC G01N15/00 

FIELD: oil and gas industry.

SUBSTANCE: invention is related to methods and devices for measurement of content of oil-dissolved gas upon separation at different values of pressure and temperature in well yield measure units. The method for determination of oil-dissolved gas content includes sampling, introduction of calibrated oil volume to the device and generation of the preset phase ratio. The method also includes bringing of oil-gas system into thermodynamic equilibrium at different temperature and registration of pressure values. At that bringing of oil-gas system into thermodynamic equilibrium is made in presence of gaseous phase in initial state within the range of pressure and temperature available at the measure units at the deposit with obtained curve of dependence of dissolved gas content on temperature and pressure with further input of the above curve to the controller of the measure unit. The device for determination of oil-dissolved gas comprises a measuring chamber with a piston and thermal jacket, a piston moving mechanism with control unit, a flange with input valve, a dosing chamber with piston and gas chamber, a valve that creates turbulence and a pressure sensor. At that the device flange is equipped with output valve and rubber membrane with a plug having a conical opening in order to ensure communication of the measuring chamber with the atmosphere.

EFFECT: improved accuracy and reliability of measurement due to performance of degassing process in conditions corresponding to real conditions at the deposit, simplified method of oil sampling and increased number of performed analysis in result.

2 cl, 1 dwg