Masniak O. Measurement of flow rate and volume of concomitant oil gas

The dissertation is devoted to development of a system for measurement of flow rate and volume of concomitant oil gas based on the differential pressure method and to development of a methodology for determining the relative expanded uncertainty of the flow rate measurement result. Based on the analysis of the existing methods for flow rate and volume measurement, the criteria for constructing a system for measurement of flow rate and volume of concomitant oil gas have been determined. According to these criteria, the differential pressure method was chosen to construct a system for measurement of flow rate and volume of concomitant oil gas. For the differential pressure method, an approach to the construction of a metering system for concomitant oil gas was created with taking into account the limitations in its component compositions and the conditions of measurement in certain ranges of pressure and temperature. As a result of the study of thermodynamic parameters of concomitant oil gas, new dependences have been developed to determine the density, adiabatic index and coefficient of dynamic viscosity of concomitant oil gas in the operating pressure and temperature ranges. Based on the differential pressure method with standard primary devices, the improved mathematical model of the flow meter has been developed together with the algorithms for calculating the flow rate and volume of concomitant oil gas. A module in the system of automatic calculation and design of differential pressure flow meter "Raskhod-RU" CAD (version 2.0) has been developed for concomitant oil gas with application of advanced algorithms for flow rate and volume calculation. The structure of the metering system for concomitant oil gas on the basis of differential pressure method has been developed and technical instruments have been selected for implementation of the metering system. The equation for calculating the relative standard uncertainty of volumetric flow rate of concomitant oil gas has been improved. Experimental study was performed to determine the relative standard uncertainty of concomitant oil gas volumetric flow rate measurement depending on the component composition variation in time. The results of the dissertation are implemented in the research and development companies involved in research, design, production and commissioning of energy carrier metering systems.