MEASUREMENT METHOD AND DEVICE FOR COMPONENT FLOW-RATE OF THREE-COMPONENT GAS-AND-LIQUID FLOW Russian patent published in 2007 - IPC E21B47/00 G01F1/74 

FIELD: measuring equipment, particularly used in oil production industry to control oil producing well operation without gas-and-liquid well product separation in fractions directly in wells or in oil accumulation areas.

SUBSTANCE: method involves directing gas-and-liquid flow in measuring device built-in main pipeline; measuring pressure, temperature and density of gas-and-liquid flow by pressure and temperature sensors and by gamma densitometer correspondingly; determining total flow-rate of gas-and-liquid flow and oil, gas and water content in the flow and calculating output of separate phases in gas-and-liquid flow. To direct gas-and-liquid flow into measuring device symmetric gas-and-liquid flow direction change scheme is used. The symmetric scheme includes ascending, horizontal and descending branches. Pressure drop in ascending and descending branches are set by means of replaceable throttle members installed in front, rear end and in center of horizontal branch. Two double-probe gamma densitometers are arranged in ascending and descending branches. Each gamma densitometer includes ionizing gamma-radiation source and gamma-radiation detectors of major and minor probes. Gas-and-liquid flow density is determined in ascending and descending branches under different working pressures. Then gas-and-liquid flow conductivity and dielectric permeability are measured by non-contact method through ascending and descending branch sections of gas-and-liquid flow defined by vertical pipes formed of radio transparent highly-strength material with the use of two electromagnetic probes operating on low and high frequencies. Volumetric water content in gas-and-liquid flow is determined from above measured conductivity and dielectric permeability. Volumetric gas-and-liquid flow rate in ascending branch is measured from pressure drop in central throttle member with the use of throttle flowmeter with taking into consideration flow density determined by gamma densitometer. Hydrocarbon content in gas-and-liquid flow is calculated from difference between volumetric gas-and-liquid flow rate and volumetric water content. Volumetric oil content in gas-and-liquid flow is determined from difference between hydrocarbon content and volumetric gas content in gas-and-liquid flow. Device for above method realization is also disclosed.

EFFECT: increased accuracy of separate component flow-rate in three-component, namely oil-gas-water flow and extended field of application due to possibility of measurement execution in wide range of gas-and-liquid flow component content.

25 cl, 2 dwg